The petrogenesis of granodiorite in Sanbao area, Qimen County, southern Anhui: Constraints from geochemistry, zircon U-Pb dating and Hf isotope

被引:0
作者
Zhu HongLi [1 ,2 ]
Yang XiaoYong [3 ]
Sun WeiDong [4 ,5 ]
机构
[1] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China
[4] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
[5] CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
关键词
Granodiorite; Zircon U-Pb dating; Hf isotope; Early Cretaceous; Arc characteristics; Pacific plate; PORPHYRY COPPER-DEPOSITS; EASTERN CHINA; TRACE-ELEMENTS; YANGTZE-RIVER; SOUTHEASTERN CHINA; JIANGNAN OROGEN; VOLCANIC-ROCKS; IGNEOUS ROCKS; O ISOTOPES; LU-HF;
D O I
暂无
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Whole-rock major and trace elements, zircon U-Pb dating and Hf isotope compositions are reported for the granodiorite from Sanbao area, Qimen County, southern Anhui, which is located in northeastern Jiangnan orogen. This intrusion shows Eu negative anomaly and HFSE depletion in trace element characteristics. Zircon U-Pb dating yields an age of similar to 142Ma for granodiorite, which indicates that this granodiorite was intruded in Early Cretaceous. The epsilon(Hf) (t) for granodiorite ranges from -4.3 to -0.3, corresponding to crust Hf model ages (t(DM)(C)) of 1220 similar to 1350Ma. On a Sr/Y versus Y diagram, granodiorite plots in arc field. Its magma zirconium saturation temperature ranges from 670 degrees C to 760 degrees C, and the temperature calculated by Ti-in-zircon thermometer ranges from 600 degrees C to 759 degrees C. The Ce(IV)/Ce(III) of zircon ranges from 150 to 1530 with an average of 550. Geochemistry and crust Hf model ages further indicate that the source of the granodiorite might be influenced by oceanic subduction. Considering the tectonic evolution of eastern China in the Early Cretaceous-Late Jurassic era, we proposed that the granodiorite was formed by lower crust partial melting triggered by slab rollback.
引用
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页码:1917 / 1928
页数:12
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