The source and ore-forming processes of post-collisional Qulong porphyry Cu-Mo deposit in Tibet constrained by Mo isotopes
文献类型：期刊论文
| 作者 | Xue, Qiqi5,6; Zhang, Lipeng4,5; Chen, Shuo4,5; Li, Congying3,5; Li, Tao1,2; Sun, Weidong3,5,6 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2024-05-05 |
| 卷号 | 652页码:10 |
| 关键词 | Porphyry deposit Mo isotope Hydrothermal fluid Qulong Tibet |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2024.122025 |
| 通讯作者 | Zhang, Lipeng(zhanglipeng@qdio.ac.cn) |
| 英文摘要 | Porphyry deposits supply most of the world's Cu and Mo resources. Most porphyry deposits are developed in magmatic arcs above subduction zones. However, abundant Miocene porphyry Cu-Mo deposits have been found in the post-collision stage in Tibet, more than similar to 30 Myr after the Indian-Eurasian continental collision. The magma source and the enrichment process of ore-forming elements for these post-collision porphyry deposits remain controversial. Here, we present Sr-Nd-Mo isotope compositions of a suite of mineralized and barren igneous rocks from the Rongmucuola pluton in the Miocene post-collisional Qulong porphyry Cu-Mo deposit in Tibet to reveal their magma sources and ore-forming processes. Our results indicate that the mineralized and barren igneous rocks in the Qulong deposit were derived from a cogenetic source with similar Sr-Nd isotope compositions (Sr-87/Sr-86((i)) = 0.7049-0.7050 and epsilon(Nd)(t) = -0.24 to 0.20). However, the mineralized igneous rocks have large variations in delta Mo-98/95 values (-0.30 parts per thousand to 0.74 parts per thousand; relative to NIST SRM 3134) and Mo/Ce ratios (0.01 to 4.84) compared to those of the barren igenous rocks (delta Mo-98/95 = -0.74 parts per thousand to -0.02 parts per thousand; Mo/Ce = 0.01 to 0.04). In combination with the higher LOI values, Mo/Ce and Cs/Ta ratios and Cu concentrations and lower Ce/Pb ratios of the mineralized igneous rocks relative to the barren igneous rocks, we propose the mineralized igneous rocks were affected by ore-forming hydrothermal fluids originated from the exsolution of later co-genetic magmas, which significantly changed the isotopic and elemental compositions of intrusions and resulted in Mo mineralization. The fluid-rock interaction modeling supports this interpretation and successfully reproduce the observed delta Mo-98/95 and Mo/Ce compositions of mineralized igneous rocks. Our study indicates that the exsolved magmatic-hydrothermal fluids have heavy Mo isotopes, and the fluids with a slightly heavier Mo isotope composition have the greatest potential for mineralization. As the water-rock reaction progresses, leading to the precipitation of Mo-rich minerals, ore-forming fluids with a heavier Mo isotope composition may not have significant mineralization potential. This highlights that Mo isotope system is an effective tool to study the ore-forming processes of porphyry deposits. |
| WOS关键词 | CONTINENTAL COLLISION ZONES ; MAGMATIC DIFFERENTIATION ; ADAKITIC ROCKS ; VOLCANIC-ROCKS ; SOUTH CHINA ; FRACTIONATION ; SUBDUCTION ; GANGDESE ; ORIGIN ; FLUID |
| 资助项目 | National Natural Science Foundation of China[42176087] ; National Natural Science Foundation of China[42176070] ; National Natural Science Foundation of China[42322605] ; National Natural Science Foundation of China[LSKJ202204100] ; Taishan Scholar Program of Shandong[tsqn202312262] ; Youth Innovation Promotion Association[2021206] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001221337900001 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; Taishan Scholar Program of Shandong ; Youth Innovation Promotion Association |
| 源URL | [http://ir.nigpas.ac.cn/handle/332004/43715]  |
| 专题 | 中国科学院南京地质古生物研究所 |
| 通讯作者 | Zhang, Lipeng |
| 作者单位 | 1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Palaeobiol & Petr Stratig, Nanjing 210008, Peoples R China 2.Nanjing Univ, Dept Earth & Planetary Sci, MOE Key Lab Surficial Geochem, Nanjing 210023, Peoples R China 3.Laoshan Lab, Deep Sea Multidisciplinary Res Ctr, Qingdao 266237, Peoples R China 4.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China 5.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xue, Qiqi,Zhang, Lipeng,Chen, Shuo,et al. The source and ore-forming processes of post-collisional Qulong porphyry Cu-Mo deposit in Tibet constrained by Mo isotopes[J]. CHEMICAL GEOLOGY,2024,652:10. |
| APA | Xue, Qiqi,Zhang, Lipeng,Chen, Shuo,Li, Congying,Li, Tao,&Sun, Weidong.(2024).The source and ore-forming processes of post-collisional Qulong porphyry Cu-Mo deposit in Tibet constrained by Mo isotopes.CHEMICAL GEOLOGY,652,10. |
| MLA | Xue, Qiqi,et al."The source and ore-forming processes of post-collisional Qulong porphyry Cu-Mo deposit in Tibet constrained by Mo isotopes".CHEMICAL GEOLOGY 652(2024):10. |
入库方式： OAI收割
来源：南京地质古生物研究所
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