辽东五龙重融型花岗质岩体锆石U-Pb年代学、岩石地球化学、Sr-Nd-Pb-Hf同位素特征及地质意义

顾玉超; 赵岩; 杨中柱; 张朋; 杨凤超; 鞠楠; 胥嘉; 杨宏智; 毕中伟; 韦延梅

doi:10.3799/dqkx.2020.220

Volume 45 Issue 11

Nov. 2020

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Article Navigation > Earth Science > 2020 > 45(11): 3913-3933

Gu Yuchao, Zhao Yan, Yang Zhongzhu, Zhang Peng, Yang Fengchao, Ju Nan, Xu Jia, Yang Hongzhi, Bi Zhongwei, Wei Yanmei, 2020. Zircon U-Pb Ages, Elements Geochemistry and Sr-Nd-Pb-Hf Isotopic Characteristics of Wulong Remelting Granite Intrusive Rocks in Liaodong Peninsula and Geological Significance. Earth Science, 45(11): 3913-3933. doi: 10.3799/dqkx.2020.220

Citation:

Gu Yuchao, Zhao Yan, Yang Zhongzhu, Zhang Peng, Yang Fengchao, Ju Nan, Xu Jia, Yang Hongzhi, Bi Zhongwei, Wei Yanmei, 2020. Zircon U-Pb Ages, Elements Geochemistry and Sr-Nd-Pb-Hf Isotopic Characteristics of Wulong Remelting Granite Intrusive Rocks in Liaodong Peninsula and Geological Significance. Earth Science, 45(11): 3913-3933. doi: 10.3799/dqkx.2020.220

Citation:

Gu Yuchao, Zhao Yan, Yang Zhongzhu, Zhang Peng, Yang Fengchao, Ju Nan, Xu Jia, Yang Hongzhi, Bi Zhongwei, Wei Yanmei, 2020. Zircon U-Pb Ages, Elements Geochemistry and Sr-Nd-Pb-Hf Isotopic Characteristics of Wulong Remelting Granite Intrusive Rocks in Liaodong Peninsula and Geological Significance. Earth Science, 45(11): 3913-3933. doi: 10.3799/dqkx.2020.220

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Zircon U-Pb Ages, Elements Geochemistry and Sr-Nd-Pb-Hf Isotopic Characteristics of Wulong Remelting Granite Intrusive Rocks in Liaodong Peninsula and Geological Significance

doi: 10.3799/dqkx.2020.220

Shenyang Center of China Geological Survey, Shenyang 110034, China

Received Date: 2020-07-28
Publish Date: 2020-11-15

Abstract

Abstract

Jurassic granitic intrusions are widely exposed on the Liaodong Peninsula on the northeastern margin of the North China craton. The Wulong granitic pluton in the Dandong area is the wall rock of the Wulong gold deposit,which contains residues of Paleoproterozoic Liaohe Group metamorphic rocks and Paleoproterozoic intrusive rocks,with fragmentation and mylonitization developed locally. In this paper,the Wulong pluton is studied in detail,revealing that it is an assemblage of acid intrusive rocks containing biotite monzonitic granite,two-mica monzonitic granite,biotite syenite granite and granodiorite. According to zircon SHRIMP U-Pb isotope dating,the crystallization ages of these four rock types are 162±3 Ma,169.3±3.1 Ma,157.5±1.7 Ma and 158.0±2.7 Ma,respectively,or Middle-Late Jurassic. The geochemistry of the rocks shows that the Wulong pluton belongs to the calc-alkaline to high-K calc-alkaline,peraluminous and mesothermal granitic magma series,with enrichments in large ion lithophile elements (LILE) such as Rb,Th,U and K and depletions in high field strength elements (HFSE) such as Nb,Ta,P,and Ti. The ε_Hf(t) values range from -39.7 to -22.9,and the t_DM2 values are between 3 711 Ma and 2 653 Ma. The ε_Nd(t) values vary from -23.8 to -20.2,and the t_DM2 values are between 2 782 Ma and 2 487 Ma. These results show that the magma source is Archean to Paleoproterozoic crustal materials. Combining this information with Pb isotopes and the microstructural characteristics of quartz,feldspar and mica,it is believed that the large-scale Jurassic Wulong pluton on the Liaodong Peninsula is S-type granite,which recrystallized from Paleoproterozoic granites and Liaohe Group rocks in-situ in the upper crust affected by Late Jurassic (ca. 160 Ma) crustal remelting. The pluton was formed in a compressional orogenic tectonic setting influenced by the subduction of the Paleo-Pacific plate during the Middle-Late Jurassic.
- upper crust remelting,
- tectonic setting,
- Wulong pluton,
- zircon SHRIMP U-Pb isotope dating,
- Liaodong Peninsula,
- geochemistry

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References(58)

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Zircon U-Pb Ages, Elements Geochemistry and Sr-Nd-Pb-Hf Isotopic Characteristics of Wulong Remelting Granite Intrusive Rocks in Liaodong Peninsula and Geological Significance

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