The Precambrian Geological Characteristics of Kigoma-Mpanda Region, <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:country-region w:st="on"><st1:place w:st="on">Tanzania</st1:place></st1:country-region> and the New Data of U-Pb Age Determination on Zircon <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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The Precambrian Geological Characteristics of Kigoma-Mpanda Region, Tanzania and the New Data of U-Pb Age Determination on Zircon

详细信息

责任者：Guo Hongjun (Tianjin Geological Exploration General Survey ; Tianjin 300181 ; China) ; Lin Xiaohui
刊名：Contributions to Geology and Mineral Resources Research
出版年：2009
卷期：24(3)
关键词：铀—铅计时 ; U-Pb dating ; 前寒武 ; Precambrian ; 坦桑尼亚 ; Tanzania
页码：p.260-266
图表：6 illus., 6 tables, 7 refs.
分类号：1300
issnNo：ISSN1001-1412
isbnNo：CN12-1131/P

摘要

Kigoma-Mpanda region is located in the west Tanzania with Precambrian rocks spreading widely. In recent years a group of new isotopic age data has been obtained from the region. The upper cross point age of tonalite sample form Shanwe hill is 2.64 Ga indicating that the granite body is formed in Neo-archean Era. However, the lower cross point age is 0.7 Ga that may represent its metamorphic age or the age of inheriting zircon. Age of granite from Filimult hill is determined at (1.893±3) Ma suggesting that it is the product of Ubendian Period. Age of Gua granite is (1.889±40) Ma showing that it is the product of syn-tectonic period of Filimult hill granite. Age of (1.337±47) Ma for Nyanahanga dolerite represents the time when Neo-Proterozoic basic dykes intruded.

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