First evidence of the Cambrian basement in Upper Peninsula of Thailand and its implication for crustal and tectonic evolution of the Sibumasu terrane

Yu Ling Lin, Meng Wan Yeh*, Tung Yi Lee, Sun Lin Chung, Yoshiyuki Iizuka, Punya Charusiri

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

35 引文 斯高帕斯(Scopus)

摘要

Although the Sibumasu terrane in Asia was previously considered to be composed of Phanerozoic rocks with Cambrian crystalline basement, no reliable or direct radiometric dating evidences of such crystalline basement was ever reported. Our new in-situ zircon U/Pb dating of the Khao Tao orthogneiss yields a concordant age of 501.5±7.5Ma (2σ), which provides the first robust evidence for the Cambrian crust in Upper Peninsula of Thailand. The zircon εHf(T) values range from +3.7 to -6.1 with model ages (TCDM) of 1244-1827Ma, suggests a mixed crust-mantle source. The chemical similarity and spatial continuity of the Khao Tao orthogneiss with other pre-Neotethys marginal Eurasian and Sibumasu granitoids indicate the linear paleogeographic association under a similar magmatic arc-related regime along the Gondwana India-Australia margin as part of the Pan-African Orogeny system.

原文英語
頁(從 - 到)1031-1037
頁數7
期刊Gondwana Research
24
發行號3-4
DOIs
出版狀態已發佈 - 2013 十一月

ASJC Scopus subject areas

  • 地質學

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