Chronology and geochemistry of the granitoids in Heri Town, Tongde County, Qinghai Province, and its tectonic significance

CHEN Yuke

2020 Vol. 39, No. 7

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CHEN Yuke. Chronology and geochemistry of the granitoids in Heri Town, Tongde County, Qinghai Province, and its tectonic significance[J]. Geological Bulletin of China, 2020, 39(7): 1015-1024.

Citation:

CHEN Yuke. Chronology and geochemistry of the granitoids in Heri Town, Tongde County, Qinghai Province, and its tectonic significance[J]. Geological Bulletin of China, 2020, 39(7): 1015-1024.

Chronology and geochemistry of the granitoids in Heri Town, Tongde County, Qinghai Province, and its tectonic significance

CHEN Yuke

Integrative Survey Party of Non-ferrous Metals Geological Exploration Bureau, Hohhot 010070, Inner Mongolia, China

Received Date: 12 March 2020

Revised Date: 27 May 2020

Publish Date: 15 July 2020

Abstract

Abstract

In this study, the author used LA-ICP-MS zircon U-Pb isotopic dating method and obtained weighted average zircon U-Pb age of 229.7±1.0 Ma from the biotite granodiorite in Heri Town, Tongde County, Qinghai Province.The geochemical characteristics show that it belongs to high-K calcium-alkali series, and resulted from partial melting of crustal components, with weak negative Eu anomalies and right-inclined chondrite-normalized REE patterns.Based on a comprehensive analysis of previous researched, the authors hold that the biotite granodiorite was formed in the Late Triassic, and belonged to I-type granite formed in the active continental margin environment before the plane collision.Its genesis was closely related to the northward subduction of the Ańyemagen-Mianlue Ocean.The results obtained by the authors provide a new age constraint for the entrance of West Qinling into the syn-collision stage in the Indosinian.
- granodiorite /
- zircon U-Pb age /
- active continental margin /
- West Qinling

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