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Inherited source affinity of Li and Hf isotopes for porphyry copper deposits from subduction and collisional settings
Lu, Yigan1; Xiao, Yilin1,2; Nadeau, Olivier3; Yang, Xiaoyong1,2; Wang, Yangyang1; Hou, Zhenhui1,2; Sun, He4; Li, Dongyong1; Gu, Haiou4; Deng, Jianghong5; Tong, Fengtai1; Tan, Dongbo1; Qi, Huasheng1; Bute, Saleh Ibrahim1,6
Corresponding AuthorXiao, Yilin(
AbstractPorphyry Cu deposits can be classified at the global scale as oceanic subduction-and continental collision-types based on their tectonomagmatic settings. In order to further characterize the possible differences in the geochemical and isotopic features of these two types of porphyry Cu deposits, Li-Hf isotopes were investigated together with bulk rock major/trace element concentrations and geochronology, for porphyritic granitoids related with four porphyry Cu deposits. The Baogutu porphyry Cu-Au deposit, Xinjiang Province, China, and the Atlas porphyry Cu-Au deposit, Philippines, are taken to represent the oceanic subduction-type, whereas the Demingding porphyry Cu-Mo deposit, Tibet Province, China, and the Grasberg porphyry Au-Cu deposit, Indonesia, are taken as proxies for the continental collision-type. The Li isotopic compositions of the Baogutu granodiorite shows a limited range of + 3.2 to + 6.5%o (avg. + 4.6 +/- 1.7%o, n = 13) in delta Li-7 values, whereas the diorite from Atlas have delta Li-7 values of + 2.6 to + 7.7 parts per thousand (avg. + 5.9 +/- 2.8 parts per thousand, n = 16), i.e., slightly higher than the Baogutu granodiorites, probably reflecting the involvement of subducted marine sediments. The relatively homogeneous and MORB-like delta Li-7 values (-+3 to 5 parts per thousand) of the Baogutu and Atlas porphyries, together with depleted zircon eHf(t) values for Baogutu (+11.8 to + 17.5, avg. + 14.5, n = 19) and Atlas (+7.1 to + 10.6, avg. + 9.0, n = 40), are suggestive of an affinity with oceanic plate, and/or partial melting of the mantle wedge in response to oceanic subduction. By contrast, the delta Li-7 values of the Demingding monzogranite and quartz porphyry, and the Grasberg quartz monzodiorite vary more broadly, ranging from-0.7 parts per thousand to + 10.3 parts per thousand (avg. + 2.5 +/- 5.9 parts per thousand, n = 19) and from-0.3 to + 7.3 parts per thousand (avg. + 3.7 +/- 4.6 parts per thousand, n = 8), respectively. These two localities also show variable zircon eHf(t) values ranging from-5.4 to + 5.7 (avg. + 2.8, n = 20) and from-20.0 to-1.0 (avg.-10.7, n = 42), respectively. The large variations of delta Li-7 and eHf(t) values at Demingding and Grasberg are generally similar to those of mid-to lower continental crust (delta Li-7 -+3.3 parts per thousand and epsilon(Hf)(t)-20.0 to + 5.7), and are thus consistent with their source regions, which are interpreted to reflect continental collisional settings. The Li-Hf isotopic compositions of the four porphyry intrusions show that tectonic settings have dominant effects on the Li-Hf isotopic compositions of the related magmatic rocks, prior to any redistribution by porphyry Cu deposits-related hydrothermal alterations, suggesting that Li-Hf isotopes systematics can partly act as tracers of the source regions related to tectonic settings.
KeywordPorphyry deposits Oceanic subduction Continental collision Li isotopes Hf isotopes
Indexed BySCI
Funding ProjectStrategic Priority Research Program (B) of CAS[XDB18000000] ; Strategic Priority Research Program (B) of CAS[41000000] ; State Key Laboratory of Ore Deposit Geochemistry open funds[201608] ; National Natural Science Foundation of China[41729001] ; National Natural Science Foundation of China[42073003]
WOS Research AreaGeology ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeology ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000700112100001
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorXiao, Yilin
Affiliation1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
2.CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China
3.China Univ Geosci, Sch Earth Resources, Dept Mineral Resources & Engn, Lab Isotopes Econ Geol & Its Environm Liege, Lumo Lu 388, Wuhan 430074, Hubei, Peoples R China
4.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
5.Chinese Acad Sci, Ctr Deep Sea Res, Ctr Ocean Megasci, Inst Oceanol, Qingdao 266071, Peoples R China
6.Gombe State Univ, Dept Geol, PMB 127, Gombe, Gombe State, Nigeria
Recommended Citation
GB/T 7714
Lu, Yigan,Xiao, Yilin,Nadeau, Olivier,et al. Inherited source affinity of Li and Hf isotopes for porphyry copper deposits from subduction and collisional settings[J]. ORE GEOLOGY REVIEWS,2021,138:21.
APA Lu, Yigan.,Xiao, Yilin.,Nadeau, Olivier.,Yang, Xiaoyong.,Wang, Yangyang.,...&Bute, Saleh Ibrahim.(2021).Inherited source affinity of Li and Hf isotopes for porphyry copper deposits from subduction and collisional settings.ORE GEOLOGY REVIEWS,138,21.
MLA Lu, Yigan,et al."Inherited source affinity of Li and Hf isotopes for porphyry copper deposits from subduction and collisional settings".ORE GEOLOGY REVIEWS 138(2021):21.
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