铜陵凤凰山岩体SHRIMP锆石U-Pb年龄与构造变形及其对岩体侵位动力学背景的制约

张达; 吴淦国; 狄永军; 臧文拴; 邵拥军; 余心起; 张祥信; 汪群峰

Volume 31 Issue 6

Jun. 2006

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Article Navigation > Earth Science > 2006 > 31(6): 823-829

ZHANG Da, WU Gan-guo, DI Yong-jun, ZANG Wen-shuan, SHAO Yong-jun, YU Xin-qi, ZHANG Xiang-xin, WANG Qun-feng, 2006. Emplacement Dynamics of Fenghuangshan Pluton (Tongling, Anhui Province): Constraints from U-Pb SHRIMP Dating of Zircons and Structural Deformation. Earth Science, 31(6): 823-829.

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Emplacement Dynamics of Fenghuangshan Pluton (Tongling, Anhui Province): Constraints from U-Pb SHRIMP Dating of Zircons and Structural Deformation

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Key Laboratory of Lithospheric Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences, Beijing 100083, China
3.
School of Geosciences and Environmental Engineering, Central South University, Changsha 410083, China

Received Date: 2006-02-11
Publish Date: 2006-11-25

Abstract

Abstract

Geodynamic settings play an important role in controlling generation, ascent and final emplacement of magma. Mesozoic intermediate-acid intrusive rocks are closely related with large scale mineralization in the Tongling metallogenic cluster area. The Fenghuangshan pluton, which consists of granodiorite and quartz monzodiorite, is the main part of the Fenghuangshan ore field. Zircon SHRIMP ²⁰⁶Pb/²³⁸U dating shows that the Fenghuangshan pluton formed at (144.2±2.3) Ma, belonging to the Late Jurassic era, which is in accordance with most of metallogenic plutons of the Tongling metallogenic cluster area. The contact deformation shows that the Fenghuangshan pluton was controlled by a regional sinistral shear stress field. The internal deformation indicates that the pluton experienced sinistral spiral ascent and final ballooning emplacement. The age and structural deformation imply that the Late Jurassic pluton related to mineralization may correlate with sinistral shear stress field induced by the northward oblique subduction of the paleo-Pacific plate.
- Tongling,
- Fenghuangshan pluton,
- SHRIMP U-Pb dating of zircons,
- structural deformation,
- geodynamics.

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References(16)

References

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