Formation of the Cretaceous skarn Cu-Au deposits of the southern Gangdese belt, Tibet: Case studies of the Kelu and Sangbujiala deposits

doi:10.1016/j.oregeorev.2020.103481

	Formation of the Cretaceous skarn Cu-Au deposits of the southern Gangdese belt, Tibet: Case studies of the Kelu and Sangbujiala deposits
	Huang, Wenting 1; Liang, Huaying 1; Zhang, Jian 3; Chen, Xilian 4; Lin Shuping 7; Zou, Yinqiao 8; Ren, Long 1; Wu, Jing5 ; Zhang, Lipeng 2,6
	2020-07-01
Source Publication	ORE GEOLOGY REVIEWS
ISSN	0169-1368
Volume	122 Pages:18
Corresponding Author	Liang, Huaying(lianghy@gig.ac.cn)
Abstract	Mesozoic subduction of Neo-Tethyan oceanic crust caused magmatism that formed numerous Jurassic and Cretaceous intrusions within the southern Gangdese belt of Tibet. These intrusions are associated with the formation of giant Jurassic Xiongcun porphyry Cu deposits, but the prospectivity of other Cretaceous intrusions in this area remains unclear. This study presents new molybdenite Re-Os ages for the Kelu and Sangbujiala Cu-Au skarn deposits within the southern Gangdese belt as well as new geochemical, zircon U-Pb geochronological, and Sr-Nd-Hf isotopic data for the intrusions associated with these deposits. These new data indicate that (1) the Kelu deposit formed at ca. 92 Ma, coeval with emplacement of the diorite and biotite granodiorite intrusions (ca. 92-90 Ma) in this area, and (2) the Sangbujiala deposit formed at ca. 95 Ma, contemporaneous with emplacement of the mineralized biotite granodiorite (ca. 95-92 Ma) in this area. These data suggest that the skarn Cu-Au mineralization in this area formed as a result of Cretaceous magmatism in the southern Gangdese belt. The intrusions associated with the Kelu and Sangbujiala deposits have adakitic affinities with low contents of Y and heavy rare-earth elements and high Sr/Y ratios (22.4-123). These intrusions also have more primitive Sr-Nd isotopic compositions (epsilon(Nd)(t) = 3.99-4.81, (Sr-87/Sr-86)(i) = 0.7040-0.7044), lower epsilon(Hf)(t) values (8.0-13.18), and higher zircon Eu-N/Eu* values (mean of 0.50) than those of contemporaneous but barren adakitic intrusions in this region. This suggests that the mineralization-related intrusions were oxidized and formed from magmas that were generated predominantly by partial melting of subducted Neo-Tethyan slab material without any significant crustal contamination or assimilation of sedimentary material. However, these intrusions contain elevated Th, Ni, and Cr contents, and have high Mg-# ratios (43.4-56.9), suggesting that they formed from magmas that interacted with metasomatized mantle wedge peridotite material. Combining our new data with the results of previous research suggests that the southern Gangdese belt records two stages of Cu-Au mineralization related to Neo-Tethyan subduction. The first stage generated the large Xiongcun porphyry Cu-Au deposit and was associated with normal subduction during the Jurassic, whereas the second stage was associated with the formation of the Kelu and Sangbujiala skarn deposits during Cretaceous slab rollback.
Keyword	Gangdese Cu-Au mineralization Cretaceous Adakitic rocks Neo-Tethyan subduction
DOI	10.1016/j.oregeorev.2020.103481
Indexed By	SCI
Language	英语
Funding Project	second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0806] ; National Key R&D Program of China[2016YFC0600407]
WOS Research Area	Geology ; Mineralogy ; Mining & Mineral Processing
WOS Subject	Geology ; Mineralogy ; Mining & Mineral Processing
WOS ID	WOS:000537805900019
Publisher	ELSEVIER
Citation statistics	Cited Times:1[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.qdio.ac.cn/handle/337002/167661
Collection	深海极端环境与生命过程研究中心
Corresponding Author	Liang, Huaying
Affiliation	1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Nanning Normal Univ, Key Lab Environm Change & Resources Use Beibu Gul, Minist Educ, Nanning 530004, Peoples R China 4.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China 5.Guangxi Univ, Coll Resources Environm & Mat, Nanning 530004, Peoples R China 6.Chinese Acad Sci, Ctr Deep Sea Res, Ctr Ocean Megasci, Inst Oceanol, Qingdao 266071, Peoples R China 7.Chongqing Key Lab Geol Survey Land Qual, Chongqing 404100, Peoples R China 8.Country Garden Ctr, Foshan 528312, Peoples R China
Recommended Citation GB/T 7714	Huang, Wenting,Liang, Huaying,Zhang, Jian,et al. Formation of the Cretaceous skarn Cu-Au deposits of the southern Gangdese belt, Tibet: Case studies of the Kelu and Sangbujiala deposits[J]. ORE GEOLOGY REVIEWS,2020,122:18.
APA	Huang, Wenting.,Liang, Huaying.,Zhang, Jian.,Chen, Xilian.,Lin Shuping.,...&Zhang, Lipeng.(2020).Formation of the Cretaceous skarn Cu-Au deposits of the southern Gangdese belt, Tibet: Case studies of the Kelu and Sangbujiala deposits.ORE GEOLOGY REVIEWS,122,18.
MLA	Huang, Wenting,et al."Formation of the Cretaceous skarn Cu-Au deposits of the southern Gangdese belt, Tibet: Case studies of the Kelu and Sangbujiala deposits".ORE GEOLOGY REVIEWS 122(2020):18.

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