Genesis of hydrous-oxidized arental magmas for porphyry Cu (Mo, Au) deposits in a postcollisional setting: examples from the Sanjiang region, SW China
文献类型:期刊论文
作者 | Lei-Luo Xu; Jing-Jing Zhu; Ming-Liang Huang; Li-Chuan Pan; Ruizhong Hu; Xian-Wu Bi |
刊名 | Mineralium Deposita |
出版日期 | 2023 |
卷号 | 58页码:161–196 |
关键词 | Porphyry Cu-mo-au Deposits postcollisional Setting Hydrous-oxidized Magma Petrogenesis Sanjiang Region |
DOI | 10.1007/s00126-022-01143-x |
英文摘要 | Magmatic sources of porphyry deposits in postcollisional settings remain controversial. We have used new and published petrological and geochemical data for the Eocene–Oligocene porphyry Cu ± Mo ± Au deposits in the Sanjiang region, SW China, to address this outstanding issue. New data for three deposits (Machangqing, Tongchang, and Beiya) in the Ailaoshan–Red River porphyry Au-Cu-Mo belt (southern part of the Sanjiang region) suggest that ore-forming porphyries were emplaced at ~ 35 Ma, have high (87Sr/86Sr)i (0.7068–0.7071) and negative εNd(t) (− 6.9 to − 5.0), low zircon εHf(t) (− 5.3 to 4.5), and relatively high δ18O (5.9–9.0‰). Magmatic amphibole phenocryst compositions indicate that the parental magmas are all relatively oxidized (ΔFMQ = 1.7 ± 0.6), and H2O-rich (3.8 ± 0.3 wt% H2O). These results are consistent with those estimated from zircon compositions (ΔFMQ = 1.8 ± 0.8) and high whole-rock Sr/Y ratios (75 ± 31), respectively. Based on the new and published data, we suggest that the parental magmas for the Ailaoshan–Red River porphyry Au-Cu-Mo belt were derived from a preserved juvenile arc lower-crust and the underlying metasomatized subcontinental lithospheric mantle (SCLM) attributed to a Neoproterozoic subduction event, whereas the parental magmas for the Yulong porphyry Cu-Mo belt (northern part of the Sanjiang region) originated from the Permian–Triassic juvenile arc lower-crust and metasomatized SCLM. Additionally, parental magmas for these porphyry deposits are all oxidized and H2O-rich, and we attribute such characteristics to inheritance from mixed mantle-crust sources that were modified by previous oceanic slab subduction. |
URL标识 | 查看原文 |
语种 | 英语 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/13542] |
专题 | 地球化学研究所_矿床地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China 2.College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China |
推荐引用方式 GB/T 7714 | Lei-Luo Xu,Jing-Jing Zhu,Ming-Liang Huang,et al. Genesis of hydrous-oxidized arental magmas for porphyry Cu (Mo, Au) deposits in a postcollisional setting: examples from the Sanjiang region, SW China[J]. Mineralium Deposita,2023,58:161–196. |
APA | Lei-Luo Xu,Jing-Jing Zhu,Ming-Liang Huang,Li-Chuan Pan,Ruizhong Hu,&Xian-Wu Bi.(2023).Genesis of hydrous-oxidized arental magmas for porphyry Cu (Mo, Au) deposits in a postcollisional setting: examples from the Sanjiang region, SW China.Mineralium Deposita,58,161–196. |
MLA | Lei-Luo Xu,et al."Genesis of hydrous-oxidized arental magmas for porphyry Cu (Mo, Au) deposits in a postcollisional setting: examples from the Sanjiang region, SW China".Mineralium Deposita 58(2023):161–196. |
入库方式: OAI收割
来源:地球化学研究所
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