粤北大宝山矿区花岗闪长斑岩LA-ICP-MS锆石U-Pb年龄及其地质意义

王磊; 胡明安; 杨振; 陈开旭; 夏金龙

doi:10.3799/dqkx.2010.018

Volume 35 Issue 2

Mar. 2010

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WANG Lei, HU Ming-an, YANG Zhen, CHEN Kai-xu, XIA Jin-long, 2010. Geochronology and Its Geological Implications of LA-ICP-MS Zircon U-Pb Dating of Granodiorite Porphyries in Dabaoshan Polymetallic Ore Deposit, North Guangdong Province. Earth Science, 35(2): 175-185. doi: 10.3799/dqkx.2010.018

Citation:

WANG Lei, HU Ming-an, YANG Zhen, CHEN Kai-xu, XIA Jin-long, 2010. Geochronology and Its Geological Implications of LA-ICP-MS Zircon U-Pb Dating of Granodiorite Porphyries in Dabaoshan Polymetallic Ore Deposit, North Guangdong Province. Earth Science, 35(2): 175-185. doi: 10.3799/dqkx.2010.018

Citation:

WANG Lei, HU Ming-an, YANG Zhen, CHEN Kai-xu, XIA Jin-long, 2010. Geochronology and Its Geological Implications of LA-ICP-MS Zircon U-Pb Dating of Granodiorite Porphyries in Dabaoshan Polymetallic Ore Deposit, North Guangdong Province. Earth Science, 35(2): 175-185. doi: 10.3799/dqkx.2010.018

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Geochronology and Its Geological Implications of LA-ICP-MS Zircon U-Pb Dating of Granodiorite Porphyries in Dabaoshan Polymetallic Ore Deposit, North Guangdong Province

doi: 10.3799/dqkx.2010.018

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Yichang Institute of Geology and Mineral Resources, China Geological Survey, Yichang 443003, China

Received Date: 2009-02-26
Publish Date: 2010-03-01

Abstract

Abstract

The dating of LA-ICP-MS zircon U-Pb was carried out for granodiorite porphyries at Dabaoshan polymetallic ore deposit in North Guangdong Province. In cathodoluminescence (CL) image, most zircons in two granodiorite porphyry samples exhibit oscillatory zoning, which is typical for magmatic zircon. The dating of LA-ICP-MS zircon U-Pb of two samples shows the results that 12 points of oscillatory zoned domains of Dabaoshan granodiorite porphyry sample yields a group of weighted mean ²⁰⁶Pb/²³⁸U ages at (175.8±1.5)Ma (MSWD=0.037) and 16 points of oscillatory zoned domains of Chuandu granodiorite porphyry yields a group of weighted mean ²⁰⁶Pb/²³⁸U ages at (175.0±1.7) Ma (MSWD=0.41). So the epoch of granodiorite porphyry emplacement is nearly 175 Ma, belonging to the first stage of the early Yanshanian (180-170 Ma). According to the precise ages we have obtained, Dabaoshan and Chuandu granodiorite porphyries are a whole magamtic rock divided by the post-mineralization fault, and the faulted space is the most important direction for further exploration of Mo-W. The study, together with others, suggests that its geodynamic setting was the same as that of the near magamatic rocks, which formed in the same episode lithosphere extension event in Nanling region. In addition, we conclude that in the first stage of the early Yanshanian, some granodiorite porphyries favorable to forming Mo-W deposits have been undiscovered in Nanling region.
- granodiorite porphyry,
- zircon,
- LA-ICP-MS U-Pb geochronology,
- Dabaoshan ore deposit

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References(80)

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