globalchange  > 气候变化与战略
DOI: 10.1016/j.earscirev.2021.103524
论文题名:
Porphyry copper and skarn fertility of the northern Qinghai-Tibet Plateau collisional granitoids
作者: Zhong S.; Li S.; Feng C.; Liu Y.; Santosh M.; He S.; Qu H.; Liu G.; Seltmann R.; Lai Z.; Wang X.; Song Y.; Zhou J.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2021
卷: 214
语种: 英语
中文关键词: Collisional tectonics ; Flat slab subduction ; Porphyry copper deposits ; Qinghai-Tibet Plateau (QTP) ; Skarn deposits
英文关键词: collision zone ; copper ; granitoid ; igneous geochemistry ; igneous intrusion ; isotopic composition ; metallogenesis ; porphyry ; skarn ; slab ; subduction ; tectonics ; China ; Qinghai-Xizang Plateau
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., εNdi = -8.1 to 0.1), with the majority of samples characterized by Paleo- to 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. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166560
Appears in Collections:气候变化与战略

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作者单位: Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang, 065000, China; School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China; Department of Earth Sciences, University of Adelaide, Adelaide, SA 5005, Australia; The Third Institution of Qinghai Geological Mineral Prospecting, Xining, 810012, China; MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China; Center for Russian and Central EurAsian Mineral Studies, Department of Earth Sciences, Natural History Museum, London, SW7 5BD, United Kingdom; Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Shandong Institute of Geological Sciences, Jinan, 250013, China

Recommended Citation:
Zhong S.,Li S.,Feng C.,et al. Porphyry copper and skarn fertility of the northern Qinghai-Tibet Plateau collisional granitoids[J]. Earth Science Reviews,2021-01-01,214
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