Petrogenesis and tectonic significance of the early Late Triassic magmatism of the northern Altaid orogenic belt

ZHAO Duanchang; LIN Xinwang; CHEN Ning; WANG Xing; ZHANG Yafeng; GUO Qiming

doi:10.12097/j.issn.1671-2552.2022.09.006

2022 Vol. 41, No. 9

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ZHAO Duanchang, LIN Xinwang, CHEN Ning, WANG Xing, ZHANG Yafeng, GUO Qiming. Petrogenesis and tectonic significance of the early Late Triassic magmatism of the northern Altaid orogenic belt[J]. Geological Bulletin of China, 2022, 41(9): 1563-1573. doi: 10.12097/j.issn.1671-2552.2022.09.006

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ZHAO Duanchang, LIN Xinwang, CHEN Ning, WANG Xing, ZHANG Yafeng, GUO Qiming. Petrogenesis and tectonic significance of the early Late Triassic magmatism of the northern Altaid orogenic belt[J]. Geological Bulletin of China, 2022, 41(9): 1563-1573. doi: 10.12097/j.issn.1671-2552.2022.09.006

Petrogenesis and tectonic significance of the early Late Triassic magmatism of the northern Altaid orogenic belt

1.
Shaanxi Institute of Geological Survey, Xi'an 710068, Shaanxi, China
2.
Shaanxi Mineral Resources and Geological Survey, Xi'an 710068, Shaanxi, China
3.
Shaanxi Satellite Application Technology Center for Natural Resource, Xi'an 710068, Shaanxi, China

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Corresponding author: CHEN Ning, 269070357@qq.com

Received Date: 29 March 2022

Revised Date: 09 June 2022

Publish Date: 15 September 2022

Abstract

Abstract

LA-ICP-MS zircon U-Pb dating for the two-mica syenogranite of Talsayi pluton in the southern margin of the northern Altaid orogenic belt yielded a ²⁰⁶Pb/²³⁸U age of 235±2 Ma(MSWD=0.46), which interpreted as product of the early Late-Triassic magmatic event.Whole-rock geochemical data show that two-mica syenogranite and two-mica monzogranite of the Talsayi pluton are characterized by high silicon and alkali, low titanium and magnesium, as well as large Rittmann Index and Aluminum Saturation Index(A/CNK)values.The lines of evidence indicate that the granitic rocks are classified into high potassium calc-alkaline peraluminous granitic series.In addition, the syenogranite and monzogranite are relatively enriched in light rare earth elements(LREE), as well as trace elements of Rb and Th, but depleted in high field-strength elements of Nb, Ta, Yb and Y, in addition, the granitic rocks show low values of magnesium and contents of Cr and Ni, and moderate values of CaO/Na₂O and low values of Al₂O₃/TiO₂.These suggest that the Talsayi pluton in the southern margin of the northern Altaid orogenic belt were formed in the syn-collision tectonic environment.Combination with the previous studies, it is proposed that the transition of tectonic regime of the Altaid orogenic belt show spatiotemporal difference with characteristic of trending from east and central to north direction during Triassic era.
- northern Altaid orogenic belt /
- syn-collision tectonic environment /
- Late Triassic /
- strong peraluminous granite /
- transition of tectonic regime

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References

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