First evidence for Archean continental crust in northern Vietnam and its implications for crustal and tectonic evolution in Southeast Asia

Ching Ying Lan*, Sun Lin Chung, Ching Hua Lo, Tung Yi Lee, Pei Ling Wang, Huimin Li, Dinh Van Toan

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

88 引文 斯高帕斯(Scopus)

摘要

Southeast Asia, or, in a more strict sense, the Indochinese continent, was previously considered to be composed entirely of Proterozoic to Phanerozoic rocks, and reliable evidence for Archean crust was lacking. Gneisses from the Cavinh Complex, south of the Red River shear zone, northern Vietnam, however, show Archean Nd model ages of 3.4-3.1 Ga. Zircon separates from the rocks yielded U-Pb dates of 2.8-2.5 Ga, the first convincing evidence for the presence of a Late Archean complex in Southeast Asia. Given that the Red River shear zone was propagating in the South China block with a left-lateral offset of ∼600 km, the Cavinh Complex can be correlated with the Late Archean Kangding Complex in the western margin of the Yangtze craton, southwestern China. The Cavinh Complex therefore represents one of the oldest crustal nuclei of the South China block.

原文英語
頁(從 - 到)219-222
頁數4
期刊Geology
29
發行號3
DOIs
出版狀態已發佈 - 2001 三月

ASJC Scopus subject areas

  • 地質學

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