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Early and Middle Proterozoic Crustal History, Borborema Province, Northeast Brazil

Early and Middle Proterozoic Crustal History, Borborema Province, Northeast Brazil
巴西东北部博博雷马省早元古代和中元古代地壳历史
批准号:
9117594
负责人:
W. Randall Van Schmus
金额:
$10.0万
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
1992
资助国家:
美国
项目状态:
已结题
起止时间:
1992-01-01 至 1994-12-31

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中文摘要
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英文摘要
The Borborema tectonic province in northern Brazil formed during the 600 Ma convergence of the West African, Amazonian and San Francisco-Congo cratons to form the ancient supercontinent of Gondwanaland. Because of the strong tectonic overprint at 600 Ma it has been difficult to identify pre-Gondwana tectonic boundaries within Borborema province. This study will provide U/Pb age determinations for key lithologic suites and magmatic events and, together with ongoing geologic mapping by Brazilian colleagues, will allow the tectonic boundaries to be delineated. The results will provide much improved understanding of the pre-600 Ma tectonic history and assembly of Gondwanaland, and will contribute to key concepts of continental growth during the Precambrian.//
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Collaborative Research: Post-Penokean Crustal Stabilization in the Lake Superior Region, North-Central United States
Late Proterozoic Tectonic Development of Northeastern Brazil
COLLABORATIVE RESEARCH: Geochronologic and Geologic Framework of Western Amazonia and Its Bearing on Possible Reconstructions with Laurentia-Baltica
Collaborative Research: Evolution of Early Proterozoic Crust, Constraints from Xenoliths of the Navajo Volcanic Field
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