The significance of (ultra)potassic mafic melts in the formation of postcollisional porphyry copper mineralization: An example from the Machangqing Cu-Mo deposit, southeastern Tibet
文献类型：期刊论文
| 作者 | Shen, Yang2,3; Zheng, Yuan-Chuan1,9; Hou, Zeng-Qian6; Huizenga, Jan Marten7,8,10; Wang, Zi-Xuan1,9; Li, Xin4,11,12; Xiao, Yuan -Yuan5; Wang, Xiao-Hong5 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2025-09-02 |
| 页码 | 29 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B38323.1 |
| 通讯作者 | Zheng, Yuan-Chuan(zhengyuanchuan@gmail.com) |
| 英文摘要 | While most porphyry Cu deposits form in magmatic arcs, some develop in nonarc environments, such as postcollisional settings. The petrogenesis and mantle contribution to fertile magmas associated with porphyry Cu systems in postcollisional settings remain poorly understood. To address these issues, we present an integrated, temporally constrained dataset of in situ zircon and apatite compositions together with whole-rock geochemistry for the Cenozoic Machangqing porphyry Cu deposit and the coeval barren Songgui intrusion from the western Yangtze Craton, southeastern Tibet. Zircon U-Pb ages indicate that both the fertile Machangqing and barren Songgui porphyries were emplaced at ca. 35 Ma in a postcollisional setting. The adakitic characteristics of the fertile and barren intrusions include high Sr/Y ratios (41-124), epsilon Nd(t) (-5.5 to -3.3), initial 87Sr/86Sr (0.7064-0.7078), zircon epsilon Hf(t) (-2.4 to +2.2), and 618O ratios (+5.9 to +7.0), which suggest that they mainly originated from partial melting of the juvenile mafic lower crust. Moreover, the fertile Machangqing porphyries have high Mg# values and high Cr and Ni contents, and show more depleted zircon epsilon Hf(t) and lower 618O compositions than those of the barren Songgui intrusions. This implies that the fertile Machangqing suites are characterized by more injections of coeval mantle-derived (ultra)potassic mafic melt. Unlike the barren intrusions, the injection of oxidized, volatilerich (ultra)potassic mafic magmas enriched the fertile porphyries in volatiles (Cl, S, and H2O) and rendered them highly oxidized. These conditions are crucial for the formation of economic porphyry Cu systems. We propose that the injection of metasomatized lithospheric mantle-derived magmas supplied heat and volatiles and elevated the oxygen fugacity of the fertile porphyries, thereby facilitating porphyry Cu mineralization in the western Yangtze Craton and similar porphyry Cu mineralization in postcollisional settings. |
| WOS关键词 | ZIRCON U-PB ; WESTERN YANGTZE CRATON ; TRACE-ELEMENT COMPOSITIONS ; MAGMATIC OXIDATION-STATE ; ND ISOTOPIC COMPOSITIONS ; EASTERN GANGDESE BELT ; ADAKITE-LIKE ROCKS ; ARC MAGMAS ; AU MINERALIZATION ; CONTINENTAL COLLISION |
| 资助项目 | National Natural Science Foundation of China[U2344204] ; National Natural Science Foundation of China[42302074] ; National Natural Science Foundation of China[42022014] ; National Key Research and Development Program of China[2019YFA0708602] ; The Deep-time Digital Earth, Science and Technology Leading Talents Team Funds for the Frontiers Science Center for Deep-time Digital Earth, China University of Geosciences, Beijing[2652023001] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001563102900001 |
| 出版者 | GEOLOGICAL SOC AMER, INC |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/203266]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Zheng, Yuan-Chuan |
| 作者单位 | 1.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 2.Tongji Univ, Sch Ocean & Earth Sci, Shanghai 200092, Peoples R China 3.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 4.Shandong Inst Geol Sci, Jinan 250013, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 6.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 7.Norwegian Univ Life Sci, Fac Environm Sci & Nat Resource Management, POB 5003, NO-1432 As, Norway 8.James Cook Univ, Econ Geol Res Inst EGRU, Coll Sci & Engn, Townsville, Qld 4811, Australia 9.China Univ Geosci, Frontier Sci Ctr Deep time Digital Earth, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 10.Univ Johannesburg, Dept Geol, POB 524, ZA-2006 Auckland Pk, South Africa |
| 推荐引用方式 GB/T 7714 | Shen, Yang,Zheng, Yuan-Chuan,Hou, Zeng-Qian,et al. The significance of (ultra)potassic mafic melts in the formation of postcollisional porphyry copper mineralization: An example from the Machangqing Cu-Mo deposit, southeastern Tibet[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2025:29. |
| APA | Shen, Yang.,Zheng, Yuan-Chuan.,Hou, Zeng-Qian.,Huizenga, Jan Marten.,Wang, Zi-Xuan.,...&Wang, Xiao-Hong.(2025).The significance of (ultra)potassic mafic melts in the formation of postcollisional porphyry copper mineralization: An example from the Machangqing Cu-Mo deposit, southeastern Tibet.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,29. |
| MLA | Shen, Yang,et al."The significance of (ultra)potassic mafic melts in the formation of postcollisional porphyry copper mineralization: An example from the Machangqing Cu-Mo deposit, southeastern Tibet".GEOLOGICAL SOCIETY OF AMERICA BULLETIN (2025):29. |
入库方式： OAI收割
来源：海洋研究所
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