莫桑比克东部沿海锆钛砂矿矿石质量特征——以赞比西亚省5004C矿区为例          下载免费PDF全文

孟令华  崔庆岗  孔德金  杜小亮 《山东国土资源》2015,31(12)

滨海砂矿是目前全球最大的潜在海洋矿产资源之一,仅次于石油与天然气。莫桑比克东部沿海滨海砂矿资源丰富,在世界上占有重要地位。该文结合莫桑比克赞比西亚省5004C矿区锆钛砂矿,分析矿石结构与构造、矿石物质组成、矿物含量及变化等矿石质量特征,为莫桑比克东部沿海锆钛砂矿的勘探和开发提供有利信息。  相似文献   

Resilience as transformative capacity: Exploring the quadripartite cycle of structuration in a Mozambican resettlement programme     

《Geoforum》2015

The concept of resilience has emerged out of a complex literature that has sought to make sense of an increasingly interconnected world that appears ever more beset by crises. Resilience’s appeal is reflected by the burgeoning mass of literature that has appeared on the subject in the past five years. However, there is ongoing debate surrounding its usage, with some commentators claiming that the term is inherently too conservative a one to be usefully applied to situations of vulnerability in which more radical social change is required. This article extends existing efforts to formulate more transformative notions of resilience by reframing it as a double-edged outcome of the pre-reflective and critical ways in which actors draw upon their internal structures following the occurrence of a negative event, thus reproducing or changing the external structural context that gave rise to the event in the first place. By employing a structuration-inspired analysis to the study of small-scale farmer responses to a flood-induced resettlement programme in central Mozambique, the article presents a systematic approach to the examination of resilience in light of this reframing. The case study findings suggest that more attention should be paid to the facilitative, as well as constraining, nature of structures if vulnerable populations are to be assisted in their efforts to exert transformative capacity over the wider conditions that give rise to their difficulties.  相似文献   

Weather-related influences on rural-to-urban migration: A spectrum of attribution in Beira,Mozambique     

《Global Environmental Change》2020

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The Commonwealth, ‘development’ and post-colonial responsibility     

Marcus Power 《Geoforum》2009,40(1):14-24

One important (though often neglected) part of the ‘development business’ committed to principles of partnership is the Commonwealth, a voluntary association of 54 independent countries, almost all of which were formerly under British rule. This paper focuses on the Commonwealth’s contemporary sense of ‘responsibility’ for shaping African development through ‘partnership’ and by promoting ‘good governance’ and examines the particular example of Mozambique, which joined the Commonwealth in 1995. In exploring exactly what membership of this post-colonial ‘family’ has meant for Mozambique the paper explores the neocolonial paternalism and sense of trusteeship that the Commonwealth has articulated in its often very apolitical vision of African development which seems to lock the continent into a permanent stage of tutelage and to repetitively reduce Africa to a set of core deficiencies for which externally generated ‘solutions’ must be devised. More generally, the paper also examines the wider context of the Commonwealth’s involvement in Africa by looking at the connections it has made to British industry, British charities and the British Department for International Development (DFID). The paper concludes with an assessment of the ‘showcase’ potential of Mozambique and its importance to Commonwealth and DFID narrations of an African ‘success’ story of peace, stability and growth since the end of the country’s devastating civil war in 1992.  相似文献   

Dugong abundance and distribution in the Bazaruto Archipelago,Mozambique     

《African Journal of Marine Science》2013,35(3):441-452

Despite the distribution of dugongs Dugong dugon ranging across nearshore waters of the tropical and subtropical regions of the Indian Ocean and western Pacific Ocean, their distribution in the western Indian Ocean is highly fragmented and appears to be declining. The population of the Bazaruto Archipelago is believed to comprise the only viable population in the region. In all, 27 surveys were flown over the Bazaruto Bay area to define the distribution and estimate the abundance of the species in the area. A total of 9 052 nautical miles of survey effort was flown during the surveys, from which there were 355 sightings of 760 dugongs. Two core areas of distribution were apparent within the surveyed area; a northern core area spread within the 10 m isobath between the Save River mouth and Ponta Bartolomeu Dias (21°24′S), and a southern core area aligned with the shallow sandbanks to the north and south of Santa Carolina Island. Group sizes recorded in the Bazaruto Archipelago were comparable to group sizes recorded in other regions where dugongs occur, although few large (>20) groups of dugongs were seen in this study. Line transect analyses of each survey showed dugong densities were considerably lower than densities recorded in surveys in Australian waters or in the Arabian Gulf, with a population estimate of 247 dugongs (CV = 34.1) when all surveys were considered, and 359 dugongs (CV = 38.2) when only the surveys that were carried out under adequate sighting conditions were included.  相似文献   

AIDS mitigation through agriculture‐based interventions in rural contexts: Junior farmer field and life schools and future livelihoods in central Mozambique     

Tanja R. Müller 《Singapore journal of tropical geography》2010,31(3):330-342

This article summarizes findings from a research project on junior farmer field and life schools (JFFLS) as an agriculture‐based intervention to improve the livelihood prospects of children and orphans made vulnerable by HIV/AIDS in central Mozambique. In the sites investigated JFFLS have opened up concrete present and potential livelihood options in agriculture and beyond. More generally, the resource profile dynamics of participants are altered in ways that provide strong grounds to believe that the skills and knowledge they have gained will positively impact the trajectories of their future lives. In terms of HIV/AIDS mitigation, the findings recommend livelihood‐based interventions aimed at altering the vulnerability context of specific population groups.  相似文献   

莫桑比克马尼卡砂金矿床地质特征          下载免费PDF全文

龚德奎  徐强 《江苏地质》2013,37(2):248-251

马尼卡砂金矿区位于莫桑比克马尼卡省马尼卡矿田东侧古河道中。地处世界著名的马尼卡金矿成矿带区,属非洲新元古代基巴拉构造旋回(距今约1100Ma)巨型造山带中部弧形突出部位之东侧。依据砂金矿床的成矿地质特征、重砂矿物组合,认为该矿床属近源型砂金矿,其中砂金的物质来源于该古河道北、西、南侧3个方向山坡上的花岗岩-绿岩地体。砂金聚集于古河道河漫滩砂层、砂砾层和泥砂质填隙物内,特别富集于底部基岩之上的砾石层之中。矿体形状严格受河床底部基岩地貌控制。  相似文献   

Relics of the Mozambique Ocean in the central East African Orogen: evidence from the Vohibory Block of southern Madagascar   总被引：4，自引：0，他引：4  

N. JÖNS  V. SCHENK 《Journal of Metamorphic Geology》2008,26(1):17-28

The Vohibory Block of south‐western Madagascar is part of the East African Orogen, the formation of which is related to the assembly of the Gondwana supercontinent. It is dominated by metabasic rocks, which have chemical compositions similar to those of recent basalts from a mid‐ocean ridge, back‐arc setting and island‐arc setting. The age of formation of protolith basalts has been dated at 850–700 Ma by U–Pb SHRIMP analysis of magmatic cores in zircon, pointing to an origin related to the Neoproterozoic Mozambique Ocean. The metabasic rocks are interpreted as representing components of an island arc with an associated back‐arc basin. In the early stage of the Pan‐African orogeny, these rocks experienced high‐pressure amphibolite to granulite facies metamorphism (9–12 kbar, 750–880 °C), dated at 612 ± 5 Ma from metamorphic rims in zircon. The metamorphism was most likely related to accretion of the arc terrane to the margin of the Azania microcontinent (Proto‐Madagascar) and closure of the back‐arc basin. The main metamorphism is significantly older than high‐temperature metamorphism in other tectonic units of southern Madagascar, indicating a distinct tectono‐metamorphic history.  相似文献   

Detrital footprint of the Mozambique ocean: U–Pb SHRIMP and Pb evaporation zircon geochronology of metasedimentary gneisses in eastern Madagascar     

Alan S. Collins  Alfred Krner  Ian C. W. Fitzsimons  Thodore Razakamanana 《Tectonophysics》2003,375(1-4):77

The southern East African Orogen is a collisional belt where the identification of major suture zones has proved elusive. In this study, we apply U–Pb isotopic techniques to date detrital zircons from a key part of the East African Orogen, analyse their possible source region and discuss how this information can help in unravelling the orogen.U–Pb sensitive high-mass resolution ion microprobe (SHRIMP) and Pb evaporation analyses of detrital zircons from metasedimentary rocks in eastern Madagascar reveal that: (1) the protoliths of many of these rocks were deposited between 800 and 550 Ma; and (2) these rocks are sourced from regions with rocks that date back to over 3400 Ma, with dominant age populations of 3200–3000, 2650, 2500 and 800–700 Ma.The Dharwar Craton of southern India is a potential source region for these sediments, as here rocks date back to over 3400 Ma and include abundant gneissic rocks with protoliths older than 3000 Ma, sedimentary rocks deposited at 3000–2600 Ma and granitoids that crystallised at 2513–2552 Ma. The 800–700 Ma zircons could potentially be sourced from elsewhere in India or from the Antananarivo Block of central Madagascar in the latter stages of closure of the Mozambique Ocean. The region of East Africa adjacent to Madagascar in Gondwana reconstructions (the Tanzania craton) is rejected as a potential source as there are no known rocks here older than 3000 Ma, and no detrital grains in our samples sourced from Mesoproterozoic and early Neoproterozoic rocks that are common throughout central east Africa. In contrast, coeval sediments 200 km west, in the Itremo sheet of central Madagascar, have detrital zircon age profiles consistent with a central East African source, suggesting that two late Neoproterozoic provenance fronts pass through east Madagascar at approximately the position of the Betsimisaraka suture. These observations support an interpretation that the Betsimisaraka suture separates rocks that were derived from different locations within, or at the margins of, the Mozambique Ocean basin and therefore, that the suture is the site of subduction of a strand of Mozambique Ocean crust.  相似文献   

莫桑比克穆鲁普拉县穆卡拉地区土壤地球化学研究     

张树淇  牛晓 《化工矿产地质》2015,(1)

通过在穆卡拉地区进行1:5万土壤地球化学测量,总结区内出露的地层、岩性、构造等地质特征,运用土壤地球化学方法进行找矿研究。元素地球化学参数统计显示,Zr、Bi、Au、Pb、Mo元素含量相对较高,变异系数较大,易参与次生富集作用,形成地球化学异常;元素分布型式显示,Ti、Ag、As、Co、Au、Cu、Bi、Mo分布广泛,离散度大,尤其是Cu元素呈显著的多峰分布,次生富集趋势强烈;因子分析、聚变分析多方统计分析表明,Cu、Ag、Au、As元素代表主要成矿元素的次生富集组合,可作为本区主要的找矿指示元素。  相似文献