扬子东南缘新元古代花岗岩的锆石U-Pb年代学、地球化学和Sr-Nd-Hf同位素:对地壳生长的约束

王艳; 马昌前; 王连训; 刘园园

doi:10.3799/dqkx.2018.900

Volume 43 Issue 3

Mar. 2018

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Article Navigation > Earth Science > 2018 > 43(3): 635-654

Wang Yan, Ma Changqian, Wang Lianxun, Liu Yuanyuan, 2018. Zircon U-Pb Geochronology, Geochemistry and Sr-Nd-Hf Isotopes of the Neoproterozoic Granites on the Southeastern Margin of the Yangtze Block: Constraint on Crustal Growth. Earth Science, 43(3): 635-654. doi: 10.3799/dqkx.2018.900

Citation:

Wang Yan, Ma Changqian, Wang Lianxun, Liu Yuanyuan, 2018. Zircon U-Pb Geochronology, Geochemistry and Sr-Nd-Hf Isotopes of the Neoproterozoic Granites on the Southeastern Margin of the Yangtze Block: Constraint on Crustal Growth. Earth Science, 43(3): 635-654. doi: 10.3799/dqkx.2018.900

Citation:

Wang Yan, Ma Changqian, Wang Lianxun, Liu Yuanyuan, 2018. Zircon U-Pb Geochronology, Geochemistry and Sr-Nd-Hf Isotopes of the Neoproterozoic Granites on the Southeastern Margin of the Yangtze Block: Constraint on Crustal Growth. Earth Science, 43(3): 635-654. doi: 10.3799/dqkx.2018.900

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Zircon U-Pb Geochronology, Geochemistry and Sr-Nd-Hf Isotopes of the Neoproterozoic Granites on the Southeastern Margin of the Yangtze Block: Constraint on Crustal Growth

doi: 10.3799/dqkx.2018.900

Wang Yan^1
,,
Ma Changqian^{2,3
,
,},
Wang Lianxun^2,3,
Liu Yuanyuan⁴

1.
Guangdong Nonferrous Metals Geological Exploration Institution, Guangzhou 510080, China
2.
Faculty of Earth Sciences, 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.
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China

Received Date: 2017-09-15
Publish Date: 2018-03-15

Abstract

Abstract

The Jiugongshan gneissic granites exposed in the southeastern margin of the Yangtze Block, and intruded into the Shuangqiaoshan Group of Early Neoproterozoic. Using the methods of cathodoluminescent images analyzing and LA-ICP-MS zircon U-Pb dating, we obtained a magma crystallization age of 830±8 Ma for the Jiugongshan intrusion. Four spots of inherited zircons yield a weighted mean at 873±7 Ma. This age might record the magmatic activity related to the collision between the Yangtze and Cathaysia blocks during the period of Early Neoproterozoic. The Jiugongshan granites are characterized by high SiO₂ (71.83%-74.20%), high K₂O+Na₂O (7.06%-7.90%), low contents of mafic components (∑TiO₂+FeO^T+MgO=2.64%-4.00%) and high K₂O/Na₂O ratios (1.25-1.64). They mainly belong to weakly peraluminous granites with A/CNK ratios (1.03-1.27). They share similar distribution patterns of REE and trace elements, i.e., enrichment in LREE and large-ion lithophile elements of K, Rb, Th and U, depletion in Sr, P and high-field-strength elements of Nb, Ta and Ti, and pronounced negative Eu anomalies (Eu/Eu^*=0.35-0.47).On the other hand, they have neutral whole-rock ε_Nd(t) values of -1.49 to +5.24 and positive ε_Hf(t) values of 3.5±1.0 to 11.0±1.1 and 5.1±0.9 to 12.9±1.1 respectively for the coeval magmatic zircon and inherited zircon.This indicates a magmatic source with significant components of the juvenile crust. The Jiugongshan intrusion might be formed in the environment of intracontinent rift and generated by partial melting of metamorphic psammitic and volcanic source. Regional comparison shows that the Nd-Hf isotopic composition of the Middle Neoproterozoic granites along the Jiangnan orogeny has the characteristics of decreased gradually from east to west, and suggests that the effect of the Early Neoproterozoic juvenile crust on granitic magmatism decreased from east to west. This might be caused by the decreasing of arc magmatic components from east to west among the orogenetic process.
- Neoproterozoic granites,
- zircon U-Pb geochronology,
- geochemistry,
- Sr-Nd-Hf isotopes,
- juvenile crust,
- petrogenesis,
- the Jiangnan orogen

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References(106)

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