宁镇地区安基山侵入岩SHRIMP锆石U-Pb年龄及其地质意义

曾键年; 李锦伟; 陈津华; 陆建培

doi:10.3799/dqkx.2013.006

Volume 38 Issue 1

Jan. 2013

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Article Navigation > Earth Science > 2013 > 38(1): 57-67

ZENG Jian-nian, LI Jin-wei, CHEN Jin-hua, LU Jian-pei, 2013. SHRIMP Zircon U-Pb Dating of Anjishan Intrusive Rocks in Ningzhen District, Jiangsu, and Its Geological Significance. Earth Science, 38(1): 57-67. doi: 10.3799/dqkx.2013.006

Citation:

ZENG Jian-nian, LI Jin-wei, CHEN Jin-hua, LU Jian-pei, 2013. SHRIMP Zircon U-Pb Dating of Anjishan Intrusive Rocks in Ningzhen District, Jiangsu, and Its Geological Significance. Earth Science, 38(1): 57-67. doi: 10.3799/dqkx.2013.006

Citation:

ZENG Jian-nian, LI Jin-wei, CHEN Jin-hua, LU Jian-pei, 2013. SHRIMP Zircon U-Pb Dating of Anjishan Intrusive Rocks in Ningzhen District, Jiangsu, and Its Geological Significance. Earth Science, 38(1): 57-67. doi: 10.3799/dqkx.2013.006

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SHRIMP Zircon U-Pb Dating of Anjishan Intrusive Rocks in Ningzhen District, Jiangsu, and Its Geological Significance

doi: 10.3799/dqkx.2013.006

1.
Faculty of Earth Resources, China University of Geosciences, Wanhan 430074, China
2.
Zhejiang Institute of Geological Survey, Hangzhou 311203, China

Received Date: 2012-04-02
Publish Date: 2013-01-15

Abstract

Abstract

The SHRIMP zircon U-Pb dating of granodiorite-porphyry, the main rock type of Anjishan rock mass yields the age of 106.9±0.9 Ma, as the formation age of the Anjishan rock mass, which shows that the Anjishan rock mass formed in the late Early Cretaceous. Anjishan rock mass is younger than the high-K calc-alkaline intermediate-acidic intrusive rocks in Tongling and other districts and it illustrates that the intermediate-acidic intrusive rocks in Ningzhen District belongs to another diagenetic event in the middle to lower Yangtze metallogenic belt's Mesozoic large magmatism. The Ningzhen District's Cu-polymetallic mineralization is closely related with the 107 Ma calc-alkaline intermediate-acidic magmatism in time, space and origin. The petrogenesis- mineralization has been a continuous process in this district. The geodynamics background of the Ningzhen District's calc-alkaline intermediate-acidic magmatism corresponds to the Mesozoic lithospheric delamination thinning event in Eastern China. It demonstrates that the middle to lower Yangtze lithosphere delamination began at about130 Ma, and lasted to 107 Ma or later.
- Anjishan rock mass,
- zircon U-Pb dating,
- geochoronolog,
- geodynamics background,
- Ningzhen district

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References(84)

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SHRIMP Zircon U-Pb Dating of Anjishan Intrusive Rocks in Ningzhen District, Jiangsu, and Its Geological Significance

doi: 10.3799/dqkx.2013.006

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