Mineralogical characteristics of the Late Cretaceous Qianjia pluton from southwestern Hainan Island and their constraints on petrogenesis

CHEN Mulong; LYU Zhaoying; MA Changqian; XUE Guicheng; HE Yusheng; WEI Changxin; YUAN Qinmin; HUANG Wuxuan; CHANG Zhenyu; LYU Changyan

doi:10.12097/gbc.2022.05.031

2024 Vol. 43, No. 4

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Article navigation > Geological Bulletin of China > 2024 > 43(4): 503-515

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CHEN Mulong, LYU Zhaoying, MA Changqian, XUE Guicheng, HE Yusheng, WEI Changxin, YUAN Qinmin, HUANG Wuxuan, CHANG Zhenyu, LYU Changyan. 2024. Mineralogical characteristics of the Late Cretaceous Qianjia pluton from southwestern Hainan Island and their constraints on petrogenesis. Geological Bulletin of China, 43(4): 503-515. doi: 10.12097/gbc.2022.05.031

Citation:

CHEN Mulong, LYU Zhaoying, MA Changqian, XUE Guicheng, HE Yusheng, WEI Changxin, YUAN Qinmin, HUANG Wuxuan, CHANG Zhenyu, LYU Changyan. 2024. Mineralogical characteristics of the Late Cretaceous Qianjia pluton from southwestern Hainan Island and their constraints on petrogenesis. Geological Bulletin of China, 43(4): 503-515. doi: 10.12097/gbc.2022.05.031

Mineralogical characteristics of the Late Cretaceous Qianjia pluton from southwestern Hainan Island and their constraints on petrogenesis

1.
Hainan Key Laboratory of Marine Geological Resources and Environment, Haikou 570206, Hainan, China
2.
Hainan Provincial Geological Survey, Haikou 570206, Hainan, China
3.
Hainan Resources Environment Survey Institute, Haikou 570206, Hainan, China
4.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China
5.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, Hubei, China

More Information

Corresponding author: LYU Zhaoying, lvzhaoying4264@163.com

Received Date: 31 May 2022

Revised Date: 27 October 2022

Publish Date: 15 April 2024

Abstract

Abstract

The Qianjia granitoid pluton is a typical granitic complex in Hainan Island during the Late Cretaceous. The complex consists of three major rock types, i.e., granodiorite, monzogranite and syenogranite. The mineral assemblages commonly composed of biotite,hornblende, plagioclase, alkali feldspar, and quartz. To further reveal the processes of rock formation and the characteristics of their source regions, as well as to infer crust-mantle interactions, this paper selects the Qianjia pluton and utilizes electron microprobe to analyze major elements of major minerals in different rock types. The results show that hornblendes and biotites are likely originated from crust-mantle mixing, and annulus zoned plagioclase may represent a magmatic activity. Microscpic identification shows a large number of magma unbalanced structures occur in the Qianjia pluton, such as embedded crystal structure of plagioclases and hornblendes, and acicular apatites, These phenomena indicate a mixing process for generation of the Qianjia composite magma combines mineral assemblages and morphological characteristics of the enclaves. As a result, the petrological and mineralogical data indicate a crust-mantle mixing generation for the Qianjia granitic complex, the mineralogical data also shows similar characteristic to I-type granites with calc-alkaline magma source, biotites formed in a low oxygen fugacity environment.
- Late Cretaceous /
- Hainan Island /
- Qianjia pluton /
- mineralogical characteristics /
- crust-mantle mixing /
- geological survey engineering

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References

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