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Genesis of hydrous-oxidized arental magmas for porphyry Cu (Mo, Au) deposits in a postcollisional setting: examples from the Sanjiang region, SW China
Lei-Luo Xu; Jing-Jing Zhu; Ming-Liang Huang; Li-Chuan Pan; Ruizhong Hu; Xian-Wu Bi
2023
发表期刊Mineralium Deposita
卷号58页码:161–196
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.

关键词Porphyry Cu-mo-au Deposits postcollisional Setting Hydrous-oxidized Magma Petrogenesis Sanjiang Region
DOI10.1007/s00126-022-01143-x
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收录类别SCI
语种英语
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被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/13542
专题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
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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.
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