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Geochemical characteristics of the Shujiadian Cu deposit related intrusion in Tongling: Petrogenesis and implications for the formation of porphyry Cu systems in the Middle-Lower Yangtze River Valley metallogenic belt, eastern China

Published on May 1, 2016in Lithos3.91
· DOI :10.1016/j.lithos.2016.02.013
Shiwei Wang4
Estimated H-index: 4
(Hefei University of Technology),
Taofa Zhou16
Estimated H-index: 16
(Hefei University of Technology)
+ 5 AuthorsNoel C. White16
Estimated H-index: 16
(Hefei University of Technology)
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Abstract
Abstract Porphyry Cu deposits can form in intracontinental or post-collision settings; however, both the genesis of fertile magmas and the mechanism of metal enrichment remain controversial. The Shujiadian porphyry Cu deposit is located in the Tongling area of the Middle–Lower Yangtze River Valley metallogenic belt. It is hosted by the Shujiadian complex, which mainly consists of quartz diorite porphyry (143.7 ± 1.7 Ma) and pyroxene diorite (139.8 ± 1.6 Ma). They both belong to the calc-alkaline series, with enrichment in large-ion lithophile elements (LILE) and light rare earth elements (LREE), depletion in high field-strength elements (HFSE) and heavy rare earth elements (HREE), and slightly negative Eu anomalies. Both quartz diorite porphyry and pyroxene diorite have geochemical affinities with adakite, and their low MgO (1.5–3.7 wt%), and Ni (3.7–6.9 ppm), Cr (2.0–44 ppm), and Th/Ce contents (0.06–0.11) indicate that the intrusive rocks have some characteristics of adakite-like rocks derived from thickened lower crust and melts from metabasaltic rocks and eclogites. Plagioclases from the quartz diorite porphyry are andesine (An value = 31.8–40.5) and from the pyroxene diorite are felsic albite and oligoclase with large-scale zones and variable An value (An value = 8.9–18.3), Fe and Sr contents, which indicate that mixing of mafic and felsic magma may have occurred in the shallow magma chamber. Compared to the barren quartz diorite porphyry, relatively lower SiO 2 contents (49.5–55.2 wt.%), higher e Nd (t) values (− 7.4 to − 6.9), e Hf (t) values (− 11.0 to − 9.1) compositions, Ti-in-zircon temperatures (714–785 °C), and variations of HREE contents of the mineralization-related pyroxene diorite suggest mixing with high-temperature mafic magma. Calculated Ce 4 + /Ce 3 + values of pyroxene diorite plot between the Ni–NiO buffer (NNO) and magnetite–hematite buffer (MH), and barren quartz diorite porphyry samples plot below the Ni–NiO buffer (NNO). Geochemical features of relatively enriched LILEs, depleted HFSEs, and markedly negative Nb–Ta anomalies, imply that the mafic magma was generated by partial melting of enriched lithospheric mantle, which had been metasomatized by slab-derived fluids from Neoproterozoic-subducted oceanic lithosphere; as a result, the parental magma was rich in H 2 O, S, and metals (e.g. Cu), with high fO 2 .
  • References (98)
  • Citations (7)
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References98
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#1Shiwei Wang (Hefei University of Technology)H-Index: 4
#2Taofa Zhou (Hefei University of Technology)H-Index: 16
Last.Fengjie Lin (Hefei University of Technology)H-Index: 1
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#1Taofa Zhou (Hefei University of Technology)H-Index: 16
#2Shiwei Wang (Hefei University of Technology)H-Index: 4
Last.Noel C. White (Hefei University of Technology)H-Index: 3
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#1John H. Dilles (OSU: Oregon State University)H-Index: 21
#2Adam J. R. Kent (OSU: Oregon State University)H-Index: 35
Last.Lucian P. Farmer (OSU: Oregon State University)H-Index: 2
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#1Long Chen (USTC: University of Science and Technology of China)H-Index: 2
#2Zi-Fu Zhao (USTC: University of Science and Technology of China)H-Index: 39
Last.Yong-Fei Zheng (USTC: University of Science and Technology of China)H-Index: 72
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#1Xinghua Ma (PKU: Peking University)H-Index: 4
#2Bin Chen (PKU: Peking University)H-Index: 26
Last.Mingchun Yang (PKU: Peking University)H-Index: 1
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#1LIXianhua (CAS: Chinese Academy of Sciences)H-Index: 78
#2Zheng-Xiang Li (Curtin University)H-Index: 70
Last.Yu-Ya Gao (CAS: Chinese Academy of Sciences)H-Index: 6
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#1Taofa Zhou (Hefei University of Technology)H-Index: 16
#2Yu Fan (Hefei University of Technology)H-Index: 12
Last.Xifei YangH-Index: 2
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Cited By7
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#1Tao Sun (Jiangxi University of Science and Technology)H-Index: 2
#2Fei Chen (Jiangxi University of Science and Technology)
Last.Yun Wang (China University of Geosciences)H-Index: 2
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#1Shunfu Lu (CAS: Chinese Academy of Sciences)
#2Xiaoqing Zhu (CAS: Chinese Academy of Sciences)
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#1Jiancheng Xie (Hefei University of Technology)H-Index: 2
#2Yu Wang (Hefei University of Technology)H-Index: 2
Last.Weidong Sun (CAS: Chinese Academy of Sciences)H-Index: 47
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