柴南缘堇青石花岗岩的Nd-Sr-Pb同位素组成及其对岩石成因、源区构造属性和构造演化的启示

巴金; 陈能松; 王勤燕; 王新宇; 张璐; 王树庆

doi:10.3799/dqkx.2012.S1.008

Volume 37 Issue S1

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BA Jin, CHEN Neng-song, WANG Qin-yan, WANG Xin-yu, ZHANG Lu, WANG Shu-qing, 2012. Nd-Sr-Pb Isotopic Compositions of Cordierite Granite on Southern Margin of the Qaidam Block, NW China, and Constraints on Its Petrogenesis, Tectonic Affinity of Source Region and Tectonic Implications. Earth Science, 37(S1): 80-92. doi: 10.3799/dqkx.2012.S1.008

Citation:

BA Jin, CHEN Neng-song, WANG Qin-yan, WANG Xin-yu, ZHANG Lu, WANG Shu-qing, 2012. Nd-Sr-Pb Isotopic Compositions of Cordierite Granite on Southern Margin of the Qaidam Block, NW China, and Constraints on Its Petrogenesis, Tectonic Affinity of Source Region and Tectonic Implications. Earth Science, 37(S1): 80-92. doi: 10.3799/dqkx.2012.S1.008

Citation:

BA Jin, CHEN Neng-song, WANG Qin-yan, WANG Xin-yu, ZHANG Lu, WANG Shu-qing, 2012. Nd-Sr-Pb Isotopic Compositions of Cordierite Granite on Southern Margin of the Qaidam Block, NW China, and Constraints on Its Petrogenesis, Tectonic Affinity of Source Region and Tectonic Implications. Earth Science, 37(S1): 80-92. doi: 10.3799/dqkx.2012.S1.008

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Nd-Sr-Pb Isotopic Compositions of Cordierite Granite on Southern Margin of the Qaidam Block, NW China, and Constraints on Its Petrogenesis, Tectonic Affinity of Source Region and Tectonic Implications

doi: 10.3799/dqkx.2012.S1.008

BA Jin^{1, 2},
CHEN Neng-song^{1, 3
,
,},
WANG Qin-yan¹,
WANG Xin-yu⁴,
ZHANG Lu^{1, 2},
WANG Shu-qing⁵

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Graduate School, 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.
Guangxi Institute of Geological Survey, Nanning 530023, China
5.
Tianjin Center of Geological Survey, China Geological Survey, Tianjin 300170, China

Received Date: 2011-07-13
Available Online: 2021-11-15
Publish Date: 2012-05-01

Abstract

Abstract

The Jinshuikou cordierite granite (JCG) is the only strong peraluminous granite pluton discovered so far on northwestern margin of the Tibetan plateau. This cordierite granite contains mafic minerals of cordierite, garnet and biotite, characterizing mafic peraluminous granite. However, more comprehensive investigations of its genetic mechanism and implications for affinity and tectonic evolution of the basement of the Qaidam block is needed. This paper studies systematically on major and trace elements and Nd-Sr-Pb isotopic geochemistry of the JCG following the geology and petrographical observation. The JCG pluton shows A/CNK=1.12-2.05, K₂O/Na₂O=0.44-2.99, Rb/Sr=0.42-1.23, Nb/Ta=11.88-15.30, and is enriched in Rb, Th and U, but depleted in Sr and Ba, significant negative Eu anomalies (δEu=0.41-1.01, average at 0.62), I_Sr=0.711 4-0.750 3 and ε_Nd(t)=-9.30 to -13.32. These data suggest that magma for the JCG was derived from partial melting of biotite-bearing metagreywacke in the upper continental crust, and that the melting conditions featuring high temperature but shallow depth level suggest existence of an extra heat source, implying that deep processes of subducted plate delamination, asthenospheric mantle upwelling, mafic magma intrusion and underplating might occurred at southern margin of the Qaidam block in the late caledonian. The JCG pluton has Nd model age (T_DM2) of 1.9-2.2 Ga and initial Pb isotope ratios ²⁰⁶Pb/²⁰⁴Pb of 18.181-18.389, ²⁰⁷Pb/²⁰⁴Pb values of 15.582-15.632 and ²⁰⁸Pb/²⁰⁴Pb values of 37.914-38.243, suggesting that the basement of the Qaidam block is geochemically akin to that of the Yangtze block.
- cordierite granite,
- Nd-Sr-Pb isotopes,
- petrogenesis,
- tectonic affinity of source region and tectonic evolution,
- Qaidam block,
- geochemistry,
- petrology

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Nd-Sr-Pb Isotopic Compositions of Cordierite Granite on Southern Margin of the Qaidam Block, NW China, and Constraints on Its Petrogenesis, Tectonic Affinity of Source Region and Tectonic Implications

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