豫西小秦岭地区秦南金矿床热液独居石U-Th-Pb定年及其地质意义

强山峰; 毕诗健; 邓晓东; 郭连巧; 李建威

doi:10.3799/dqkx.2013.005

Volume 38 Issue 1

Jan. 2013

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Article Navigation > Earth Science > 2013 > 38(1): 43-56

QIANG Shan-feng, BI Shi-jian, DENG Xiao-dong, GUO Lian-qiao, LI Jian-wei, 2013. Monazite U-Th-Pb Ages of the Qinnan Gold Deposit, Xiaoqinling District: Implications for Regional Metallogenesis and Tectonic Setting. Earth Science, 38(1): 43-56. doi: 10.3799/dqkx.2013.005

Citation:

QIANG Shan-feng, BI Shi-jian, DENG Xiao-dong, GUO Lian-qiao, LI Jian-wei, 2013. Monazite U-Th-Pb Ages of the Qinnan Gold Deposit, Xiaoqinling District: Implications for Regional Metallogenesis and Tectonic Setting. Earth Science, 38(1): 43-56. doi: 10.3799/dqkx.2013.005

Citation:

QIANG Shan-feng, BI Shi-jian, DENG Xiao-dong, GUO Lian-qiao, LI Jian-wei, 2013. Monazite U-Th-Pb Ages of the Qinnan Gold Deposit, Xiaoqinling District: Implications for Regional Metallogenesis and Tectonic Setting. Earth Science, 38(1): 43-56. doi: 10.3799/dqkx.2013.005

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Monazite U-Th-Pb Ages of the Qinnan Gold Deposit, Xiaoqinling District: Implications for Regional Metallogenesis and Tectonic Setting

doi: 10.3799/dqkx.2013.005

QIANG Shan-feng^{1, 2
,},
BI Shi-jian^{2, 3},
DENG Xiao-dong^{2, 3},
GUO Lian-qiao⁴,
LI Jian-wei^{2, 3
,
,}

1.
Land and Resource Bureau, Lingbao, Henan Province, Lingbao 472500, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
Laboratory of Geological Research, Hefei 230001, China

Received Date: 2012-03-18
Publish Date: 2013-01-15

Abstract

Abstract

Two contrasting models have been proposed to explain the large-scale gold mineralization in the Xiaoqinling gold district, which is the second largest gold producer in China. The first model advocates that gold deposits in the Xiaoqinling district formed in the Triassic in relation to continental collision of the Qinling Orogen, whereas the second indicates that gold mineralization occurred in the Early Cretaceous and was genetically related to lithospheric thinning of the North China Craton. In this paper, we present high precision monazite U-Th-Pb ages of the Qinnan gold deposit in the north metallogenic belt of the Xiaoqinling district, by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Petrographic observations show the monazite occurs as euhedral grains and invariably intergrown with quartz and pyrite, suggesting that monazites are of hydrothermal origin and precipitate with gold-bearing minerals coevally. In the ²⁰⁶Pb/²³⁸U-²⁰⁷Pb/²³⁵U and ²⁰⁶Pb/²³⁸U-²⁰⁸Pb/²³²Th diagrams, all of the 13 analyses are concordant or nearly concordant, with weighted mean ²⁰⁶Pb/²³⁸U and ²⁰⁸Pb/²³²Th ages of 120.9±0.9 Ma (MSWD=1.0) and 122.6±1.9 Ma (MSWD=2.6), respectively. These ages are reproducible with existing geochronological data for major gold deposits in the Xiaoqinling district, demonstrating that the U-Th-Pb isotopes of the monazite have remained closed since its precipitation, and thus the U-Th-Pb ages can be reliably interpreted as the mineralizing age of the Qinnan gold deposit. A synthesis of available age constraints suggests that gold mineralization throughout the Xiaoqinling district occurred with a relatively short time interval in the Early Cretaceous and was likely related to the lithospheric thinning of the North China Craton at that time.
- Xiaoqinling district,
- hydrothermal monazite,
- U-Th-Pb dating,
- geochronology,
- gold deposits,
- lithospheric thinning

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References(111)

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Monazite U-Th-Pb Ages of the Qinnan Gold Deposit, Xiaoqinling District: Implications for Regional Metallogenesis and Tectonic Setting

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