Petrogenesis of the microcrystalline-dioritic enclaves from Jiuling granitoids in the eastern segment of Jiangnan Orogen and constraints on magma source materials

Zheng Duan; Guang-fu Xing; Sheng-bing Liao; Ping-li Chu; Wen-cheng Huang; Yan-hui Zhu; Xu-jie Shu; Chang-bo Li

doi:10.31035/cg2018042

2018 Vol. 1, No. 3

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Article navigation > China Geology > 2018 > 1(3): 374-391

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Zheng Duan, Guang-fu Xing, Sheng-bing Liao, Ping-li Chu, Wen-cheng Huang, Yan-hui Zhu, Xu-jie Shu, Chang-bo Li, 2018. Petrogenesis of the microcrystalline-dioritic enclaves from Jiuling granitoids in the eastern segment of Jiangnan Orogen and constraints on magma source materials, China Geology, 1, 374-391. doi: 10.31035/cg2018042

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Petrogenesis of the microcrystalline-dioritic enclaves from Jiuling granitoids in the eastern segment of Jiangnan Orogen and constraints on magma source materials

Nanjing Center of China Geological Survey, Nanjing 210016, China

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Corresponding author: njxgfu@163.com (Guang-fu Xing)

Received Date: 08 December 2017

Revised Date: 08 August 2018

Accepted Date: 08 September 2018

Available Online: 08 September 2018

Publish Date: 25 November 2018

Abstract

Abstract

Numerous dark enclaves with different shapes are found in Jiuling Neoproterozoic granitoids. Precise LA-ICP-MS U-Pb dating was conducted on zircons extracted from two microcrystalline enclave samples, yielding crystallization ages of 822.6±5.8 Ma and 822.2±6.2 Ma, respectively. The consistent ages within analytical errors with the host granitoids suggested that they were the products of the same magmatism. The microcrystalline-dioritic enclaves commonly show plastic forms and contain similar plagioclase megacrysts to the host rocks, and both of the enclaves and host granitoids showed a complex composition and structural imbalance in plagioclases. Furthermore, the apatites with a euhedral acicular shape occurred widely in the microcrystalline-dioritic enclaves. All of these petrographic features above imply magma mixing is involved in their diagenesis. The enclaves and host granitoids show a marked zircon trace element difference and Hf isotopic signatures without correlation in zircon trace element pairs but form their own system between enclaves and host granitoids. Additionally, most of the zircons show extremely high ε_Hf (t) with ε_Hf (t) =3.54−11.94 from the southern samples, and ε_Hf (t) =1.0−9.09 from the central region. Some zircons with the higher ε_Hf (t) are similar to the zircons from the juvenile island arc in the eastern segment of Jiangnan Orogen. Integrated geological and Hf isotopic characteristics suggest microcrystalline-dioritic enclaves were derived from the partial melting process of the Mesoproterozoic crust which enriched juvenile island arc materials and mixed with the granitic magma that remelted from the Mesoproterozoic continental crust which relatively enriched ancient sediments and mixed with the host granitoid in diagenesis.
- Zircon U-Pb age /
- Zircon trace element compositions /
- Hf isotopic compositions /
- Magma mixing /
- Jiuling Pluton

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