Geochronological and geochemical characteristics of the rhyolites in Taerqi of middle Da Hinggan Mountains and their geological significance

LI Jie; Lü Xinbiao; CHEN Chao; GUN Minshan; YANG Yongsheng; XU Yiqun; WANG Lin; ZHANG Shuai

2016 Vol. 35, No. 6

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LI Jie, Lü Xinbiao, CHEN Chao, GUN Minshan, YANG Yongsheng, XU Yiqun, WANG Lin, ZHANG Shuai. Geochronological and geochemical characteristics of the rhyolites in Taerqi of middle Da Hinggan Mountains and their geological significance[J]. Geological Bulletin of China, 2016, 35(6): 906-918.

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LI Jie, Lü Xinbiao, CHEN Chao, GUN Minshan, YANG Yongsheng, XU Yiqun, WANG Lin, ZHANG Shuai. Geochronological and geochemical characteristics of the rhyolites in Taerqi of middle Da Hinggan Mountains and their geological significance[J]. Geological Bulletin of China, 2016, 35(6): 906-918.

Geochronological and geochemical characteristics of the rhyolites in Taerqi of middle Da Hinggan Mountains and their geological significance

1. Faculty of Earth Resource, China University of Geosciences, Wuhan 430074, Hubei, China;
2. State Key Laboratory of Geological Processes and Mineral Resource, China University of Geosciences, Wuhan 430074, Hubei, China;
3. Geological Survey Institute, China University of Geosciences, Wuhan 430074, Hubei, China

Received Date: 14 August 2015

Revised Date: 18 April 2016

Publish Date: 15 June 2016

Abstract

Abstract

Taerqi area is located in the middle main ridge of Da Hinggan Mountains, where there is developed a suite of late Mesozo-ic volcanic rocks, which include basalt, andesite, dacite, rhyolite and tuff. In this paper, detailed LA-ICP-MS zircon U-Pb geochro-nological and element geochemical studies were carried out for the rhyolites. The zircon U-Pb dating yielded a weighted average age of 132±2Ma(MSWD=1.5,2σ), indicating that the rhyolites were formed at the middle stage of the early Cretaceous. Rock geo-chemical characteristics show that the rocks are peraluminous cal-alkaline rhyolites, which are characterized by high SiO₂(71.6%~77%), high potassium and alkali content (K₂O=4.5%~5.46%, Na₂O+K₂O=7.94%~9.64%). Trace elements have a similar variation trend that systematic enrichment of LILE and depletion of HFSE as well as LREE fractionation are more obvious than that of HREE, and also show significant weak anomaly of Eu (δEu=0.22~0.7). In addition, there exist the depletion of Sr, Ba, P, Ti, Nb, Ta and en-richment of Rb, K, Th, U, Zr, Hf. The rocks belong genetically to A type with a high zirconium saturation temperature (T_Zr=842℃),and the magma source was probably similar to the metagrewacks. Accordingly, it is inferred that the A-type rhyolites were products of partial melting of the crust and formed in a post-collision environment and an extensional tectonic setting.
- middle Da Hinggan Mountains /
- Taerqi area /
- zircon U-Pb dating /
- A-type rhyolites /
- post-orogenic

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References

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