华北克拉通南缘小秦岭金矿区基性脉岩时代及地质意义

毕诗健; 李建威; 李占轲

doi:10.3799/dqkx.2011.003

Volume 36 Issue 1

Jan. 2011

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BI Shi-jian, LI Jian-wei, LI Zhan-ke, 2011. Geological Significance and Geochronology of Paleoproterozoic Mafic Dykes of Xiaoqinling Gold District, Southern Margin of the North China Craton. Earth Science, 36(1): 17-32. doi: 10.3799/dqkx.2011.003

Citation:

BI Shi-jian, LI Jian-wei, LI Zhan-ke, 2011. Geological Significance and Geochronology of Paleoproterozoic Mafic Dykes of Xiaoqinling Gold District, Southern Margin of the North China Craton. Earth Science, 36(1): 17-32. doi: 10.3799/dqkx.2011.003

Citation:

BI Shi-jian, LI Jian-wei, LI Zhan-ke, 2011. Geological Significance and Geochronology of Paleoproterozoic Mafic Dykes of Xiaoqinling Gold District, Southern Margin of the North China Craton. Earth Science, 36(1): 17-32. doi: 10.3799/dqkx.2011.003

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Geological Significance and Geochronology of Paleoproterozoic Mafic Dykes of Xiaoqinling Gold District, Southern Margin of the North China Craton

doi: 10.3799/dqkx.2011.003

BI Shi-jian^{1, 2
,},
LI Jian-wei^{1, 2
,
,},
LI Zhan-ke^{1, 2}

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2010-08-25
Publish Date: 2011-01-01

Abstract

Abstract

Lode gold deposit is the most economically important type of gold deposits worldwide. It commonly occurs in Archean to Paleoproterozoioc metamorphic terrains and has close spatial relationship with mafic dykes. However, it is still in dispute whether mafic dykes and gold mineralization are genetically related. In this paper, we present LA-ICPMS zircon U-Pb and biotite ⁴⁰Ar-³⁹Ar ages of four mafic dikes samples collected from three major gold deposits (Dongchuang, Dahu and Qiangma deposits) in the Xiaoqinling gold district, southern margin of the North China craton. Four samples yielded a consistent zircon LA-ICPMS age (²⁰⁷Pb/²⁰⁶Pb 1 819±10 Ma) and a slightly younger ⁴⁰Ar/³⁹Ar plateau age (1 719.0±21.0 Ma) of biotite. Our results suggest that: (1) numerous mafic dikes in the Xiaoqinling gold district formed in Paleoproterozoioc, in an extensional setting after the collision between the eastern and western blocks of the North China craton at ca. 1.85 Ga; (2) previous whole rock K-Ar and Rb-Sr ages (187.6-75.9 Ma) which are significantly younger than our ages represent thermal perturbation (or cooling ages) caused by Mesozoic tectonic-thermal event. Recent geochronological studies show that the majority of gold deposits formed in Early Cretaceous (130-120 Ma) in the Xiaoqinling district. Therefore, the mineralization event had no relationship with Paleoproterozoic mafic dykes although they were spatially associated. However, this study does not rule out the possibility of existence of Mesozoic mafic dykes in the Xiaoqinling area, which may be very important for the understanding of the metallogeny and regional tectonic setting.
- mafic dikes,
- geochronology,
- lode gold deposit,
- Xiaoqinling gold district,
- lithology

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References(87)

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沈阳化工大学材料科学与工程学院沈阳 110142

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Geological Significance and Geochronology of Paleoproterozoic Mafic Dykes of Xiaoqinling Gold District, Southern Margin of the North China Craton

doi: 10.3799/dqkx.2011.003

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