| Genesis of Cretaceous igneous rocks and its related large scale porphyry Cu-Au mineralization in Chating, the Middle-Lower Yangtze River Metallogenic Belt: The geochemical constrains | |
| Qi, Huasheng1,2; Lu, Sanming2; Yang, Xiaoyong1; Zhao, Lili2; Zhou, Yuzhang2; Deng, Jianghong3; Li, Jianshe2 | |
| 2020-12-01 | |
| 发表期刊 | ORE GEOLOGY REVIEWS
 |
| ISSN | 0169-1368 |
| 卷号 | 127页码:16 |
| 通讯作者 | Lu, Sanming(lusanming5101@sina.com) ; Yang, Xiaoyong(xyyang@ustc.edu.cn) |
| 摘要 | The newly discovered large Chating porphyry Cu-Au deposit is associated with early Cretaceous intrusive rocks in the Middle-Lower Yangtze River Belt (MLYRB), eastern China. Two types of intrusive rocks in the Chating area have been identified, i.e., the quartz-diorite porphyry, related to the Cu-Au mineralization, and the diorite porphyry that is ore-barren. Zircon LA-ICP-MS U-Pb dating yields 145-136 Ma for the Chating intrusions. They both belong to High-K calc-alkaline series, with enrichments of large-ion lithophile elements (LILEs) and light rare earth elements (LREEs), depletions of high field-strength elements (HFSEs) and heavy rare earth elements (HREEs), and no or slightly negative Eu anomalies. The quartz-diorite porphyry shows high Sr contents and Sr/Y ratios; low MgO, Cr and Ni contents; medium (La/Yb)N and Mg# (34.6-54.6) and low K2O/Na2O (<1) values; decoupling of Sr/Y and (La/Yb)N; and low Th/U (3.49-6.08) values, thus exhibiting characteristics of slab derived adakitic rocks. In addition, it has slightly enriched Sr-Nd-Hf isotopes ((Sr-87/Sr-86)i = 0.70655-0.70717, epsilon(Nd)(t) = -6.9 to -8.8, and epsilon(Hf)(t) = -7.6 to -10.6) and high radiogenic Pb isotopes ((Pb-206/Pb-204)(i) = 18.22-18.70, (Pb-207/Pb-204)(i) = 15.63- 15.66 and (Pb-208/Pb-204)(i) = 38.49-38.97), reflecting the involvement of subducted sediments in the magma source. Therefore, the fertile quartz-diorite porphyry was most likely generated by the partial melting of the slab-derived, subducted sediments and a partial degree of metasomatized mantle-derived magma with crustal assimilation. As to the barren diorite porphyry, it has similar Sr-Nd-Pb isotope and trace element features as the fertile adakitic samples. However, it shows relatively lower SiO2 contents; high contents of MgO (3.89-4.06 wt%), Cr and Ni (avg. 47.6 ppm and avg. 15.01 ppm); high Mg# (51.2-69.8); and more enriched Hf isotope characteristics (-8.5 to-12.9), which imply that this barren diorite porphyry could be generated from the partial melting of enriched metasomatised lithospheric mantle assimilated with old continental crust materials. The delta S-34 values of the pyrite and chalcopyrite of the ores in Chating indicate a magmatic-derived source, resembling other porphyry-skarn Cu-Au deposits in the MLYRB. The fertile Qtz-diorite porphyry adakitic rocks are characterized by higher oxygen fugacities than the barren diorite porphyry, which are closely related with the partial melting of the subducted oceanic slab in an oxidizing environment, thus making them favorable for Cu-Au mineralization. |
| 关键词 | Slab melting Sr-Nd-Pb-Hf-S isotopes Petrogenesis Adakitic rocks Chating porphyry Cu Au deposit Middle-Lower Yangtze River Metallogenic Belt |
| DOI | 10.1016/j.oregeorev.2020.103793 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Key Research and Development Program of China[2016YFC0600209] ; Natural Science Foundation of China[41673040] ; Natural Science Foundation of China[42030801] |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| WOS类目 | Geology ; Mineralogy ; Mining & Mineral Processing |
| WOS记录号 | WOS:000599704700002 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/169493 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Lu, Sanming; Yang, Xiaoyong |
| 作者单位 | 1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China 2.Publ Geol Survey Management Ctr Anhui Prov, Hefei 230091, Peoples R China 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qi, Huasheng,Lu, Sanming,Yang, Xiaoyong,et al. Genesis of Cretaceous igneous rocks and its related large scale porphyry Cu-Au mineralization in Chating, the Middle-Lower Yangtze River Metallogenic Belt: The geochemical constrains[J]. ORE GEOLOGY REVIEWS,2020,127:16. |
| APA | Qi, Huasheng.,Lu, Sanming.,Yang, Xiaoyong.,Zhao, Lili.,Zhou, Yuzhang.,...&Li, Jianshe.(2020).Genesis of Cretaceous igneous rocks and its related large scale porphyry Cu-Au mineralization in Chating, the Middle-Lower Yangtze River Metallogenic Belt: The geochemical constrains.ORE GEOLOGY REVIEWS,127,16. |
| MLA | Qi, Huasheng,et al."Genesis of Cretaceous igneous rocks and its related large scale porphyry Cu-Au mineralization in Chating, the Middle-Lower Yangtze River Metallogenic Belt: The geochemical constrains".ORE GEOLOGY REVIEWS 127(2020):16. |
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