Geochronology, geochemistry and lithosphere extension of Kafang diabase in Gejiu area, Yunnan Province

SHANG Zhi; CHEN Yongqing; TONG Xiang; SHEN Silian

doi:10.12029/gc20200906003

2024 Vol. 51, No. 2

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SHANG Zhi, CHEN Yongqing, TONG Xiang, SHEN Silian. 2024. Geochronology, geochemistry and lithosphere extension of Kafang diabase in Gejiu area, Yunnan Province[J]. Geology in China, 51(2): 632-649. doi: 10.12029/gc20200906003

Citation:

SHANG Zhi, CHEN Yongqing, TONG Xiang, SHEN Silian. 2024. Geochronology, geochemistry and lithosphere extension of Kafang diabase in Gejiu area, Yunnan Province[J]. Geology in China, 51(2): 632-649. doi: 10.12029/gc20200906003

Geochronology, geochemistry and lithosphere extension of Kafang diabase in Gejiu area, Yunnan Province

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Department of Emergence Rescue, China Fire and Rescue Institute, Beijing 102201, China
3.
Yunnan Tin Company Limited, Gejiu 661000, Yunnan, China

Fund Project: Supported by the projects of the National Natural Science Foundation of China (No.41972312, No.41672329), the National Key Research and Development Project of China (No.2016YFC0600509), and China Geological Survey (No.1212011120341).

More Information

Author Bio: SHANG Zhi, male, born in 1991, doctor, majors in mineral resource prospecting and exploration; E-mail: shangzhi6609@163.com
Corresponding author: CHEN Yongqing, male, born in 1960, professor, engaged in mineral resource prospecting and exploration related teaching and research work; E-mail: yqchen@cugb.edu.cn.

Received Date: 06 September 2020

Revised Date: 31 October 2020

Publish Date: 25 March 2024

Abstract

Abstract

This paper is the result of geological survey engineering.
Objictive
The exploration of the petrogenesis and tectonic setting of the Kafang diabase is crucial to know about the tectonomagmatic evolution in Gejiu area.
Methods
Based on LA−ICP−MS zircon U−Pb age, whole−rock geochemistry and Sr−Nd−Pb isotope analysis, the formation age, geochemical characteristics and geological significance of Kafang diabase dike are studied.
Results
Zircon U−Pb dating shows that the age of Kafang diabase is 77 Ma. Inherited zircon ages (2409 Ma, 2616 Ma, 290 Ma) indicate tectono−thermal related Neoarchean and Paleoproterozoic metamorphic basement and the magmatic activity in Early Permian in Gejiu area. The Kafang diabase belongs to the shoshonite series with the characteristics of low SiO₂ content and high K₂O, TiO₂, MgO contents. In primitive mantle normalized trace elements diagram, these samples show similarities with OIB and enriched in LILEs (such as Rb, K, Sr), depleted in HFSEs (such as Nb, Ta, Zr, Hf). High initial ⁸⁷Sr/⁸⁶Sr ratios (0.70782−0.70791), positive εNd(t) values (2.07−2.29) and initial Pb isotopic compositions (²⁰⁶Pb/²⁰⁴Pb=18.286−18.465, ²⁰⁷Pb/²⁰⁴Pb=15.668−15.717, ²⁰⁸Pb/²⁰⁴Pb=37.763−38.830) indicate the enriched mantle (EM2) source.
Conclusions
The petrogenesis of Kafang diabase is that the upwelling of asthenosphere in an extensional setting induced 5%−15% partial melting of garnet lherzolite at a depth of 60−120 km in the lithospheric mantle. The new−formed magma with characteristics of EM2 consists of the primary magma of the Kafang diabase. During the ascent of magma, contamination of the lower crust occurred accompanied by weak fractional crystallization, and then formed the Kafang diabase.
- diabase /
- zircon U−Pb dating /
- geochemistry /
- petrogenesis /
- tectonic setting /
- geological survey engineering /
- Gejiu /
- Yunnan Province

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