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The impact of mortality from external causes on human development in the Brazilian borderland

de Castro, Jose Marcelo; Rodrigues-Junior, Antonio Luiz
Fonte: CADERNOS SAUDE PUBLICA; RIO DE JANIERO Publicador: CADERNOS SAUDE PUBLICA; RIO DE JANIERO
Tipo: Artigo de Revista Científica
Português
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27.14%
This article estimates the impact of mortality from external causes on the human development index (HDI) along the Brazilian borderland from 2000 to 2005. Data obtained from Brazilian government agencies were combined using the methodology defined by the United Nations Development Program, revealing the HDI according to actual conditions. Subsequently, deaths from external causes were excluded in order to estimate their impact on the index, recalculating life expectancy using the technique of competing causes. HDI showed a gradual increase from North to South, with the most developed regions concentrated in the South, consistent with studies using other sets of economic indicators. By excluding mortality from external causes, the highest gains appeared in regions where the HDI (under actual conditions) were lower, and the magnitude of gains declined towards the South.

A influência da mortalidade por causas externas no desenvolvimento humano na faixa de fronteira brasileira; The external causes mortality influence upon human development in the brazilian borderland

Castro, José Marcelo de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 25/01/2011 Português
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A desigualdade sócio-especial é uma característica distinta do Brasil que se expressa em diferentes formas, seja no acesso à educação, à saúde, à política ou à disponibilidade de renda e bens materiais. Estas desigualdades, muitas vezes, são determinantes para limitar as oportunidades dos indivíduos a uma vida longa, saudável e produtiva. No Brasil observa-se um elevado número de óbitos que ocorrem precocemente, reduzindo a expectativa de vida e impactando negativamente no desenvolvimento humano. Este trabalho tem como objetivo estudar o padrão de mortalidade por causas externas na região da faixa de fronteira brasileira entre os anos de 2000 e 2005, abordando o impacto no desenvolvimento humano, em relação aos determinantes geográficos, demográficos, socioeconômicos e temporais. Para a caracterização, a mortalidade foi estratificada por sexo, faixa etária e agregada em regiões e sub-regiões, utilizando o coeficiente de mortalidade geral-CMG, coeficiente de mortalidade específico e a razão de mortalidade proporcional-RPM e Anos potenciais de vida perdidos-APVP e, para a mensuração do impacto da mortalidade por causas externas no desenvolvimento humano, o valor da perda de produção bruta-VPPB e o índice de desenvolvimento humano-IDH. Materiais e Métodos. Este estudo descritivo...

How to drag with a worn-out mouse? Searching for social justice through collaboration

Penteado, Miriam Godoy; Skovsmose, Ole
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 217-230
Português
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We consider what a concern for social justice in terms of social inclusion might mean for teacher education, both practising and prospective, with particular reference to the use of information and communication technology (ICT) in mathematics education taking place at a borderland school. Our discussion proceeds through the following steps: (1) We explore what a borderland position might denote to address what social inclusion might mean. (2) We consider the significance of mathematics education and the use of ICT for processes of social inclusion. (3) We briefly refer to the Interlink Network, as many of our observations emerge as reflections on this project. (4) We present different issues that will be of particular importance with respect to teacher education if we want to establish a mathematics education for social inclusion. These issues concern moving away from the comfort zone, establishing networks, identifying new approaches, moving beyond prototypical research, and getting in contact. This brings us to (5) final considerations, where we return to the notion of social justice. © Springer Science+Business Media B.V. 2009.

Ndau identity in the Mozambique-Zimbabwe borderland

Patrício, Marta
Fonte: Instituto Universitário de Lisboa Publicador: Instituto Universitário de Lisboa
Tipo: Conferência ou Objeto de Conferência
Publicado em //2011 Português
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The Ndau are one of many African groups that show the division provoked by the establishment of colonial borders. The effects caused by this territorial demarcation to the definition of a transnational Ndau identity, as well as the evolutions around this identitarian feeling, specially affected by sociopolitical transformations in both countries (specially colonial wars and civil wars) are fundamental analysis elements to the update of knowledge about this ethnic group. The academic debates about ethnicity have been largely discussed in the past decades, specially the ethnicity historicity, i.e., if ethnic groups are deep-rooted in ancestral identities or if they were invented by colonialism. Jean-Loup Amselle, for instance, sustains that ethnic identities are colonial creations, that there wasn’t such thing as an ethnic group during pre-colonial ages and that ethnic identities were sculpted only by the colonizers’ will of territorialize the African continent; after that, the local populations have reappropriated these identities. However, nowadays there is an emerging consensus about the importance of looking to ethnic identities as a process of constant transformations, adaptations and negotiations previous to colonialism (although only known in this period)...

Living in the mugano – the partitioned ndau in the Mozambique-Zimbabwe borderland

Patrício, Marta
Fonte: Instituto Universitário de Lisboa Publicador: Instituto Universitário de Lisboa
Tipo: Conferência ou Objeto de Conferência
Publicado em //2012 Português
Relevância na Pesquisa
27.14%
The Mozambique-Zimbabwe border is one of longest boundaries in Southern Africa. Running for about 1,231 km, it divides eastern Zimbabwe and central Mozambique. At the same time, it is one of the least researched borders in Southern Africa. While some research has been carried out along this border focusing on refugees (Hughes 1999), on labour and migration (Tornimbeni 2005, Newitt & Tornimbeni 2008), on agriculture and environmental conservation (Tornimbeni 2007, Hughes 2009), and on land politics and traditional authorities (Tornimbeni 2010, Florêncio 2005), very little is known about how the borderland communities perceive and relate to the boundary.

Blood sucking Diptera (Culicidae, Psychodidae, Simuliidae) in forest fragment under impact of dam in the borderland of Rio Grande do Sul and Santa Catarina states, Brazil

Muller,Gerson Azulim; Dalavequia,Maira Aparecida; Wagner,Glauber; Marcondes,Carlos Brisola
Fonte: Universidade Federal de Santa Maria Publicador: Universidade Federal de Santa Maria
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/07/2014 Português
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The study of Diptera of medical importance in areas affected by dam constructions is very important due to the possibility of the occurrence of diseases transmitted by these species. Collections were performed during 2010 and 2011 in an area under impact of a dam on the Uruguai River in the borderland of Rio Grande do Sul and Santa Catarina states. Insects were collected using suction tubes and Shannon trap, also immature live forms were obtained by manual collect. Eight-hundred sixty-one Diptera insects were captured, including Haemagogus leucocelaenus (Culicidae), Aedes albopictus (Culicidae), three species of Anopheles spp. (Culicidae), two of Plebotominae and three distinct Simuliidae species. The Diptera fauna in the area is diversified and species with medical importance were identified before and after reservoir filling.

Ultrastructure of laevigate hilate spores in sporangia and spore masses from the Upper Silurian and Lower Devonian of the Welsh Borderland

H.Wellman, C.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 29/12/1998 Português
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Spore masses and isolated sporangia, containing laevigate hilate cryptospores attributable to the dispersed taxon Laevolancis divellomedia sensu lato, have been recovered on bulk maceration of Upper Silurian (Pridoli) and Lower Devonian (Lochkovian) deposits from the Welsh Borderland. Detailed morphological, anatomical and ultrastructural analysis, using light microscope, scanning electron microscope and transmission electron microscope techniques, reveals subtle differences between the specimens and they can be grouped into five distinct types. The different groups are distinguished principally by using sporangia-spore mass characteristics, presence or absence of extra-exosporal material and nature of spore-wall ultrastructure. Of the groups, one has a uniformly homogeneous exospore and the other four groups have a bilayered exospore. In the former the spores lack extra-exosporal material and occur in a discoidal sporangium. Of the bilayered groups, two have exospores of homogeneous composition but with the two layers differing in electron density. They occur in discoidal sporangia and spore masses and are distinguished on the presence or absence of extra-exosporal material and differences in the widths of the two layers. Finally...

Not by Force Alone: Russian Incorporation of the Dnieper Borderland, 1762-1800

Mykhed, Oksana Viktorivna
Fonte: Harvard University Publicador: Harvard University
Tipo: Thesis or Dissertation
Português
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This dissertation concentrates on the history of frontiers, borderlands, and empires in Eastern and Central Europe in the eighteenth century. While the existing literature examines mainly ideological and political competitions among the empires for land, resources, and the stateless population; I explore more physical and material spheres of rivalry such as border security, economy and public health. This dissertation explores the politics of the Russian Empire in these spheres in the eighteenth century. It argues that the policies of improvement in migration control, border infrastructure, and health care promoted by the government of Catherine II allowed the empire to incorporate its borderland with Poland-Lithuania and attract the local population more swiftly and effectively than did political repressions, ideological propaganda, or forced cultural assimilation.; History

Egypt's asymmetric integration in the EU : the making (and unmaking) of a neoliberal borderland?

ROCCU, Roberto
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Trabalho em Andamento Formato: application/pdf
Português
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There is little doubt that the EU has played a key role within the wider constellation of forces pushing several Arab Mediterranean countries on the path of economic reform since the late 1980s. This is particularly clear in the case of Egypt, where the EU has been able to differentiate itself from international financial institutions and main donors in two crucial respects. On the one hand, it has proposed integration through a gradualist approach to economic reforms. On the other hand, within the wider process of multiscalar restructuring, the EU has tried to entrench its own model of integration through re-regulation in its periphery, promoting EU standards in several key areas ranging from agriculture to banking to telecoms. Following from these processes, Egypt has been asymmetrically integrated in the EU’s economic ‘sphere of influence’, a process which in turn has contributed to three fundamental forms of differential integration within Egypt. One is most obvious and has a sectorial nature, with some parts of the Egyptian economy highly integrated with, and others effectively prevented access to, the EU market. The second form of differential integration is socioeconomic, and has seen outward-oriented sections of the Egyptian elite capturing most benefits of integration...

Borderless world vs borders as walls: insights from a borderland group in northern Ethiopia

Dias, Alexandra Magnólia
Fonte: Instituto Universitário de Lisboa Publicador: Instituto Universitário de Lisboa
Tipo: Parte de Livro
Publicado em 06/02/2013 Português
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The border between Eritrea and Ethiopia changed status frequently from the 19th century up to Eritrea’s independence (Triulzi, 2006: 7). With the creation of Eritrea as an Italian colony and prior to the incorporation of Ethiopia into the Italian East African Empire the border was defined according to colonial treaties. However, the border waxed and waned over the decades of their political coexistence. Indeed, the border's status shifted from a mere internal-administrative marker to a colonial border, to dissolution, to an inter-state border during the one-decade federation, became an internal border again, went through a phase of contested no-man’s-land during the civil war and, finally, acquired the status of an international border between two sovereign states. Prior to the outbreak of hostilities in May 1998 the border had never been delimited or demarcated. For all practical purposes the ethnic groups straddling the border continued their usual daily business regardless of the borderline. For borderland groups Eritrea’s independence was of secondary importance in the face of the general sense of security generated by the end of the civil war against the Derg.

Pocahontas Goes to the Clinic: Popular Culture as Lingua Franca in a Cultural Borderland

Mattingly, Cheryl
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 18/04/2008 Português
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Urban hospitals constitute an example of what is arguably the most visible site in anthropology these days—the border zone. Negotiating health care requires trafficking in tricky spaces where patients and their families must pay vigilant attention about when to submit, when to resist, and how to collaborate. Drawing from ethnographic research carried out over the past nine years among African American families who have children with severe illnesses and disabilities, I examine how children's popular culture operates in the fraught borderland that constitutes the urban clinic. Global icons like a Disneyfied Pocahantas can function as a lingua franca, offering a language of publicly available symbols on which families, health professionals, and children can draw to create a shared imaginative space across race and class divides and across the sometimes even more radical divide between sufferer and healer.

High-resolution mapping of two large-scale transpressional fault zones in the California Continental Borderland: Santa Cruz-Catalina Ridge and Ferrelo faults

Legg, Mark R.; Kohler, Monica D.; Shintaku, Natsumi; Weeraratne, Dayanthie S.
Fonte: American Geophysical Union Publicador: American Geophysical Union
Tipo: Article; PeerReviewed Formato: application/pdf; application/msword; application/pdf
Publicado em /05/2015 Português
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New mapping of two active transpressional fault zones in the California Continental Borderland, the Santa Cruz-Catalina Ridge fault and the Ferrelo fault, was carried out to characterize their geometries, using over 4500 line-km of new multibeam bathymetry data collected in 2010 combined with existing data. Faults identified from seafloor morphology were verified in the subsurface using existing seismic reflection data including single-channel and multichannel seismic profiles compiled over the past three decades. The two fault systems are parallel and are capable of large lateral offsets and reverse slip during earthquakes. The geometry of the fault systems shows evidence of multiple segments that could experience throughgoing rupture over distances exceeding 100 km. Published earthquake hypocenters from regional seismicity studies further define the lateral and depth extent of the historic fault ruptures. Historical and recent focal mechanisms obtained from first-motion and moment tensor studies confirm regional strain partitioning dominated by right slip on major throughgoing faults with reverse-oblique mechanisms on adjacent structures. Transpression on west and northwest trending structures persists as far as 270 km south of the Transverse Ranges; extension persists in the southern Borderland. A logjam model describes the tectonic evolution of crustal blocks bounded by strike-slip and reverse faults which are restrained from northwest displacement by the Transverse Ranges and the southern San Andreas fault big bend. Because of their potential for dip-slip rupture...

Dissolution kinetics of biogenic silica collected from the water column and sediments of three Southern California borderland basins

Cheng, Tao; Hammond, Douglas E.; Berelson, William M.; Hering, Janet G.; Dixit, Suvasis
Fonte: Elsevier Publicador: Elsevier
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em 30/01/2009 Português
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Understanding biogenic silica (bSi) dissolution kinetics in margin environments is important in assessing the global silicon cycle, a cycle closely linked to the global carbon cycle. This understanding is also essential to answer the question of whether bSi content in marine sediment is a valid indicator of productivity in the overlying surface ocean. In this study, plankton tow, sediment trap, and sediment samples were collected at sites in three Southern California borderland basins. Batch dissolution experiments with plankton tow and sediment trap materials (conducted in the laboratory at 22 °C) showed linear dissolution kinetics, from which mean dissolution rate constants of 0.05 d^(−1) for plankton tow samples and 0.07 d^(−1) for sediment trap samples could be calculated. The dissolution rate constants for both types of samples showed seasonal variability but not the same seasonal patterns. Faster dissolution was observed with sediment trap samples collected at 800 m than at 550 m. With sediment multi-core samples, non-linear dissolution kinetics was observed, which complicates the direct comparison of dissolution rates. Nonetheless, dissolution appeared to be slower for the sediments samples than for samples collected from the water column and to decrease with depth in the sediments. Rate constants for surface sediment (0–0.5 cm) were at least 3–5 times less...

Crustal structure of the Borderland-Continent Transition Zone of southern California adjacent to Los Angeles

Nazareth, Julie J.; Clayton, Robert W.
Fonte: American Geophysical Union Publicador: American Geophysical Union
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em 30/08/2003 Português
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We use data from the onshore-offshore component of Los Angeles Region Seismic Experiment (LARSE) to model the broad-scale features of the midcrust to upper mantle beneath a north-south transect that spans the continental borderland in the Los Angeles, California, region. We have developed an analysis method for wide-angle seismic data that consists primarily of refractions, lacks near-offset recordings, and contains wide gaps in coverage. Although the data restrict the analysis to the modeling of broad-scale structure, the technique allows one to explore the limits of the data and determine the resolving power of the data set. The resulting composite velocity model constrains the crustal thickness and location and width of the continent-Borderland transition zone. We find that the mid to lower crust layer velocities of the Inner Borderland are slightly lower than the corresponding layers in the average southern California crust model, while the upper mantle velocity is significantly higher. The data require the Moho to deepen significantly to the north. We constrain the transition zone to initiate between the offshore slope and the southwest Los Angeles Basin. If the Inner Borderland crust is 22 km thick, then the transition zone is constrained to initiate within a 2 km wide region beneath the southwest Los Angeles Basin...

Analysis of teleseismic P waves with a 5200-station array in Long Beach, California: Evidence for an abrupt boundary to Inner Borderland rifting

Schmandt, Brandon; Clayton, Robert W.
Fonte: American Geophysical Union Publicador: American Geophysical Union
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em /10/2013 Português
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We analyze teleseismic P waves from four Mw ≥ 6.5 earthquakes recorded by a petroleum industry survey in Long Beach, California. The survey used a 2-D array with up to 5200 seismometers, 120 m mean spacing, and 7 – 10 km aperture. At frequencies near 1 Hz, P wave travel times and amplitudes exhibit coherent lateral variations over scales as short as ~400 m, including locally delayed travel times and increased amplitudes at the crest of the Long Beach anticline. Deeper heterogeneity is indicated by P wave phase velocities that deviate from reference model predictions for events from southwestern azimuths. We postulate that a sharp northeastward increase in Moho depth from the Inner Borderland (IB) to mainland southern California causes the anomalous phase velocities. Elastic forward modeling finds the travel times are fit well by a Moho that dips 65° to the northeast and flattens ~10 km southwest of the Newport-Inglewood fault zone. Constraining the felsic thickness of mainland crust to 28 km requires an 8 km thick layer with a P-velocity of 7 km/s beneath it, which could result from basal accretion of former Farallon ocean crust or magmatic underplating during Miocene volcanism. Forward models with a 65° Moho dip predict a P-to-s conversion with a phase velocity of ~5 km/s. Deconvolution of the array's mean P wave signal isolates a similar later arriving phase. The steep crust thickness transition supports a locally abrupt boundary to IB rifting. Our results highlight the utility of dense short-period arrays for passive imaging at near surface to uppermost mantle depths.

Lithospheric structure across the California Continental Borderland from receiver functions

Reeves, Zachary; Lekić, Vedran; Schmerr, Nicholas; Kohler, Monica; Weeraratne, Dayanthie
Fonte: American Geophysical Union Publicador: American Geophysical Union
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em /01/2015 Português
Relevância na Pesquisa
27.92%
Due to its complex history of deformation, the California Continental Borderland provides an interesting geological setting for studying how the oceanic and continental lithosphere responds to deformation. We map variations in present-day lithospheric structure across the region using Ps and Sp receiver functions at permanent stations of the Southern California Seismic Network as well as ocean bottom seismometer (OBS) data gathered by the Asthenospheric and Lithospheric Broadband Architecture from the California Offshore Region Experiment (ALBACORE), which enhances coverage of the borderland and provides first direct constraints on the structure of the Pacific plate west of the Patton Escarpment. Noisiness of OBS data makes strict handpicking and bandpass filtering necessary in order to obtain interpretable receiver functions. Using H-κ and common-conversion point stacking, we find pronounced lithospheric differences across structural blocks, which we interpret as indicating that the Outer Borderland has been translated with little to no internal deformation, while the Inner Borderland underwent significant lithospheric thinning, most likely related to accommodating the 90° clockwise rotation of the Western Transverse Range block. West of the Patton Escarpment...

The July 1986 Oceanside (M_L = 5.3) earthquake sequence in the Continental Borderland, Southern California

Hauksson, Egill; Jones, Lucile M.
Fonte: Seismological Society of America Publicador: Seismological Society of America
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em /12/1988 Português
Relevância na Pesquisa
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An earthquake of M_L = 5.3 occurred at 32°58.7′N, 117°51.5′W southwest of Oceanside in San Diego County at 13:47 13 July 1986 (UT). This main shock was followed by an extensive aftershock sequence, with 55 events of M_L ≧ 3.0 during July 1986. The epicenters of the main shock and aftershocks are located at the northern end of the San Diego Trough-Bahia Soledad fault zone (SDT-BS) where it changes strike from northwest to a more westerly direction through a left offset or a bend in the fault. The northwest-striking SDT-BS is one of three strike-slip fault systems that constitute the offshore Agua Blanca fault system. The spatial distribution of the aftershocks indicates a unilateral 7- to 9-km long rupture to the east-southeast away from the epicenter of the main shock. The focal mechanism of the main shock also has an east-southeast striking and south-dipping plane with mostly reverse movement on it. Focal mechanisms of the M_L ≧ 3.0 aftershocks show both reverse and strike-slip movement. The reverse focal mechanisms indicate that this sequence may have occurred on a thrust fault that provides for a left stepping offset or a bend in the San Diego Trough fault as movement is transferred to the west along the Santa Cruz-Catalina Island escarpment. Some of the aftershocks that are located to the southeast of the main shock and have strike-slip focal mechanisms suggest activation of the northwest-trending San Diego Trough fault. A stress inversion of the focal mechanism data shows that the maximum principal stress determined from the focal mechanisms of the main shock and 22 aftershocks that occurred within 36 hours of the main shock has an azimuth of S30°W plunging 18°. The maximum principal stress determined from 30 aftershocks that occurred from 15 July to 2 October 1986 has an azimuth of S20°W...

How Borders Come to Matter? The "Physicality" of the Border in Gloria Anzaldúa’s "Borderlands/La Frontera"; Como se materializam as fronteiras? A corporalidade da fronteira em "Borderlands/La Frontera", e Gloria Anzaldúa

Savi, Melina Pereira; Universidade Federal de Santa Catarina
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; Formato: application/pdf
Publicado em 18/06/2015 Português
Relevância na Pesquisa
27.14%
http://dx.doi.org/10.5007/2175-7917.2015v20n2p181In this piece I attempt to address the ways in which Gloria Anzaldúa, in Borderlands: La Frontera (2007), negotiates the idea of the border as having both discursive and material dimensions. In creating a new mestiza consciousness from the borderland, which is the space that is affected by the borderline, Anzaldúa develops concepts and ideas that can be linked to Donna Haraway’s articulation of the cyborg and to Karen Barad’s theory of an agential realist ontology in the sense that Anzaldúa engages creatively with contradicting parts of her identity in a cyborgian fashion, and sees the enactment of borders as both limiting and empowering, as having emotional and material effects. Anzaldúa then addresses these effects and demonstrates how she applies them in the fabrication of a new consciousness, the consciousness of the new mestiza. In this work, therefore, I explore how the border makes itself physically present in Anzaldúa’s Borderlands and how the discursive meets matter; and I do this by finding common threads and possible connections among the works of Anzaldúa, Haraway, and Barad.; http://dx.doi.org/10.5007/2175-7917.2015v20n2p181Neste artigo, analiso as maneiras com as quais Gloria Anzaldúa...

Living on the frontline: Politics, migration and transfrontier conservation in the Mozambican villages of the Mozambique-South Africa borderland.

Norman, William Oliver
Fonte: London School of Economics and Political Science Thesis Publicador: London School of Economics and Political Science Thesis
Tipo: Thesis; NonPeerReviewed Formato: application/pdf
Publicado em //2005 Português
Relevância na Pesquisa
27.14%
This thesis is concerned with relations between the state and society in the rural communities of the district of Massingir, close to Mozambique's southern border with South Africa. Based on 17 months of fieldwork, it explores how the changing relations between the neighbouring states have affected the social, economic, and political lives of the residents of this borderland. It addresses issues concerned with labour migration, local politics, and the recent development of the Great Limpopo Transfrontier Park (GLTP). There has been a long history of male labour migration from this region to the goldmines in South Africa. While this migration has been of economic importance to the people of Massingir, it has also become deeply embedded in their social and cultural lives, signifying the transition from adolescence to manhood. However, cross-border relations deteriorated when Mozambique gained independence and the mining industry reduced its dependence on foreign labour. This thesis argues that, despite recruitment cutbacks, the social and economic pressures remain for the young men of Massingir to migrate. Unable to cross the border legally, they cross illegally and attempt to find temporary employment. Migration has been important in constructing the ethnic Shangaan identity of this area. I argue that...

FOSSIL CONTENT AND STRUCTURAL RELATIONSHIPS OF THE SAN LUIS ZONE and THE CABORCA ZONE OF NW SONORA, MEXICO. SUPPRESSION OF THE PRECAMBRIAN Z OF CABORCA

Radelli,Luigi; Weiss,Vivianne Solis; Dórame-Navarro,Miguel; De La Cruz-Ortega,Lissette del Carmen; Urrutia,Jesé
Fonte: Boletin de Geología Publicador: Boletin de Geología
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2008 Português
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In the Caborca region of western Sonora a Precambrian Z does not cover a unique Precambrian socle as previously believed. Two tectonic zones occur there instead : the San Luis Zone and the Caborca Zone. The first is comprised of the Precambrian San Luis socle of gneiss and granite, crossed by 1.1 Ga old anorthosites, the San Luis sedimentary cover, and, above it, a Lower Jurassic volcano-sedimentary sequence. The Caborca Zone consists of the Precambrian Bamori socle of parametamorphic rocks crossed by 1.1 Ga old Aibo granite, and of the Gamuza sedimentary cover. 1.1 Ga ago the two zones were far away from each other. They have been brought together by the Nevadian orogeny. Both zones are allochthonous, and the Caborca Zone is a nappe upon the San Luis Zone. The lowermost units of the Gamuza cover furnished psammocorals and a possible Pterophyllum jageri (?). Accordingly, its geological age is either Palaeozoic or Triassic.The San Luis cover furnished Nematophites [Prototaxites (?) and Nematothallus] from its lower part; Calcispongiae, Cardaicarpus' seeds, and Artisia from its upper part. Thus, it is a Devono-Carboniferous unit. The study area belongs in the « Baja-Borderland » block, which underwent, an Eocene northwards drifting of about 900 - 1000 km...