Porphyry copper and skarn fertility of the northern Qinghai-Tibet Plateau collisional granitoids

doi:10.1016/j.earscirev.2021.103524

CORC > 海洋研究所 > 中国科学院海洋研究所

	Porphyry copper and skarn fertility of the northern Qinghai-Tibet Plateau collisional granitoids
	Zhong, Shihua 8,9,10; Li, Sanzhong 8,9,10; Feng, Chengyou 11; Liu, Yongjiang 8,9,10; Santosh, M.1,2,8,9; He, Shuyue 3; Qu, Hongying 4; Liu, Guoyan 3; Seltmann, Reimar 6; Lai, Zhiqing 8,9
刊名	EARTH-SCIENCE REVIEWS
	2021-03-01
卷号	214 页码:22
关键词	Collisional tectonics Flat slab subduction Porphyry copper deposits Skarn deposits Qinghai-Tibet Plateau (QTP)
ISSN号	0012-8252
DOI	10.1016/j.earscirev.2021.103524
通讯作者	Zhong, Shihua(zhongshihua@ouc.edu.cn) ; Li, Sanzhong(sanzhong@ouc.edu.cn)
英文摘要	The recent discovery of numerous large porphyry Cu deposits in the southern Qinghai-Tibet Plateau shows that porphyry Cu deposits can be hosted in magmatic suites in collisional settings. However, in contrast, only a few small porphyry Cu deposits have so far been discovered in association with collision-related granitoids in the northern Qinghai-Tibet Plateau. This raises questions about the origin of collision-related magmas and their mineralization potential. In this contribution, we comprehensively synthesize whole-rock geochemical and isotopic data on collision-related intrusions from the Qimantagh Metallogenic Belt in the northern Qinghai-Tibet Plateau, which hosts many skarn polymetallic deposits but only a few, small porphyry Cu-Mo deposits. This, combined with newly obtained zircon trace element data, provides a high-quality database that can yield insights on the nature and origin of the magmatic suites as well as their fertility in terms of Cu mineralization. Two volumetrically dominant intrusive suites are identified in the Qimantagh Metallogenic Belt: 435-370 Ma granitoids (Suite I) and 245-196 Ma granitoids (Suite II). They formed during syn-to post-collisional stages of the Caledonian and Hercynian-Indosinian Orogenies, respectively. In contrast, arc magmatic rocks are relatively scarce. Both Suites I and II are characterized by low zircon Ce/Ce* and Eu/Eu* values, low whole-rock Sr/Y and Eu/Eu* values with arc-like features (e.g., depletion of Nb and Ta). Furthermore, both suites display some evolved Sr-Nd-Hf isotopic values (e.g., ?Ndi =-8.1 to 0.1), with the majority of samples characterized by Paleoto Meso-Proterozoic two-stage Nd and Hf model ages. These features suggest that the parental magmas of the two suites were probably derived from subduction fluid-modified mantle sources which underwent significant crustal AFC processes during magma ascent. The relative scarcity of arc magmatic rocks and the prevalence of collisional magmatism during the Caledonian and Hercynian-Indosinian Orogenies in the Qimantagh Metallogenic Belt can be explained by pre-collisional, flat-slab subduction and subsequent slab breakoff during collision, the later triggering asthenosphere upwelling and extensive magmatism in collisional settings. Compared to fertile plutons in some large porphyry Cu deposits worldwide, especially those in the Gangdese Metallogenic Belt, the two suites in the Qimantagh Metallogenic Belt have low magmatic oxidation states and low water content which inhibited the formation of large porphyry Cu deposits. Thus, skarn polymetallic deposits (probably as well as small porphyry Cu-Mo deposits) rather than large porphyry Cu deposits should be targeted during future mineral exploration in the northern Qinghai-Tibet Plateau, since such deposits do not necessarily need a parental magma with high oxidation state and water content.
资助项目	Natural Science Foundation of Shandong Province[ZR2020QD027] ; China Postdoctoral Science Foundation[2020T130621] ; China Postdoctoral Science Foundation[20180838] ; Fundamental Research Funds for the Central Universities of China[201813026] ; Science and Technology Project of Qinghai Province[2019ZJ7009] ; Taishan Scholar Program of Shandong Province[ts20190918] ; Qingdao Leading Innovation Talents Program[193219zhc] ; Natural Environment Research Council[NE/P017452/1]
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000631728900001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/170172]
专题	中国科学院海洋研究所
通讯作者	Zhong, Shihua; Li, Sanzhong
作者单位	1.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 2.Univ Adelaide, Dept Earth Sci, Adelaide, SA 5005, Australia 3.Third Inst Qinghai Geol Mineral Prospecting, Xining 810012, Peoples R China 4.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 6.Nat Hist Museum, Dept Earth Sci, Ctr Russian & Cent EurAsian Mineral Studies, London SW7 5BD, England 7.Shandong Inst Geol Sci, Jinan 250013, Peoples R China 8.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Submarine Geosci & Prospecting Tech, MOE, Qingdao 266100, Peoples R China 9.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China 10.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
推荐引用方式 GB/T 7714	Zhong, Shihua,Li, Sanzhong,Feng, Chengyou,et al. Porphyry copper and skarn fertility of the northern Qinghai-Tibet Plateau collisional granitoids[J]. EARTH-SCIENCE REVIEWS,2021,214:22.
APA	Zhong, Shihua.,Li, Sanzhong.,Feng, Chengyou.,Liu, Yongjiang.,Santosh, M..,...&Zhou, Jie.(2021).Porphyry copper and skarn fertility of the northern Qinghai-Tibet Plateau collisional granitoids.EARTH-SCIENCE REVIEWS,214,22.
MLA	Zhong, Shihua,et al."Porphyry copper and skarn fertility of the northern Qinghai-Tibet Plateau collisional granitoids".EARTH-SCIENCE REVIEWS 214(2021):22.