川西石棉花岗岩的锆石U-Pb年龄和岩石地球化学特征: 岩石成因与构造意义

林广春

doi:10.3799/dqkx.2010.076

Volume 35 Issue 4

Jul. 2010

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LIN Guang-chun, 2010. Zircon U-Pb Age and Petrochemical Characteristics of Shimian Granite in Western Sichuan: Petrogenesis and Tectonic Significance. Earth Science, 35(4): 611-620. doi: 10.3799/dqkx.2010.076

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LIN Guang-chun, 2010. Zircon U-Pb Age and Petrochemical Characteristics of Shimian Granite in Western Sichuan: Petrogenesis and Tectonic Significance. Earth Science, 35(4): 611-620. doi: 10.3799/dqkx.2010.076

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Zircon U-Pb Age and Petrochemical Characteristics of Shimian Granite in Western Sichuan: Petrogenesis and Tectonic Significance

doi: 10.3799/dqkx.2010.076

LIN Guang-chun^{1, 2
,}

1.
College of Earth Sciences and Resources, Chang'an University, Xi'an 710054, China
2.
Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an 710054, China

Received Date: 2009-10-26
Available Online: 2021-11-10
Publish Date: 2010-07-01

Abstract

Abstract

Neoproterozoic magmatic rocks are widespread in western margin of the Yangtze block, and their genesis and tectonic setting have been an issue in hot debate at the present time. SHRIMP U-Pb zircon age, petrology, geochemical and Nd isotopic data are reported for the Neoproterozoic Shimian granite in the Kangdian rift of western Sichuan. This pluton is of metaluminous high-K calc-alkalic I-type granite and emplaced at 818±7 Ma. Petrology, geochemical and Nd isotopic characters suggest that the pluton was generated by partial melting of pre-existing, young (Late Mesoproterozoic to Early Neoproterozoic) island arc crust, with contamination of old crust materials during magma ascending and emplacement. The Shimian granite is the product of the tectonic transition from compression to introplate extension in western margin of the Yangtze block. Their arc-like geochemical features (such as Nb-Ta depletion) should have been inherited from the protoliths, rather than reflection of their tectonic setting when the pluton formed.
- granite,
- Kangdian rift,
- Neoproterozoic,
- tectonic setting,
- geochemistry,
- geochronology

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References(62)

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Zircon U-Pb Age and Petrochemical Characteristics of Shimian Granite in Western Sichuan: Petrogenesis and Tectonic Significance

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