气候变化领域集成服务门户(CCPortal): Linking the Siberian Flood Basalts and Giant Ni-Cu-PGE Sulfide Deposits at Norilsk

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DOI	10.1029/2020JB020823
	Linking the Siberian Flood Basalts and Giant Ni-Cu-PGE Sulfide Deposits at Norilsk
	Yao Z.-S.; Mungall J.E.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The world-class magmatic sulfide deposits in the Norilsk region exhibit a remarkable spatial and temporal association with the Siberian large igneous province (LIP). However, the details of the causal connection between the Siberian LIP and the ore deposits have remained contentious. Here we address the problem by modeling of assimilation, crystallization and flow behavior of magmas based on aggregated data from the Norilsk camp. Crustal assimilation at depth by mantle-derived picritic magma can account for the compositional and isotopic variations of the early tholeiitic basalts and the sequestering of sulfide liquid in a mid-crustal conduit system. When the rate and volume of asthenospheric magma production dramatically increased, the metal tenors of the mid-crustal sulfide reservoir were first upgraded by consequent reaction with the fresh, undepleted magmas, then entrained and flushed to higher crustal levels. The resulting sulfide-rich emulsions were too dense to reach the surface to form lavas but were instead emplaced in multiple pulses within blind sill-like bodies at shallow depth. Sulfide ores transported from the mid-crust were deposited at the bases of the upper-crustal sills, where sedimentary host rocks were assimilated wholesale by the already sulfide-charged replenishing magmas; this shallow assimilation was itself not instrumental in forming the ores. Although the evolution and dynamics of flood basalts are thus inextricably linked with coeval subvolcanic economic intrusions, the mineralization itself is argued not to occupy feeders with direct links to the overlying lavas, suggesting major implications for exploration in other LIPs. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	fluid dynamics simulation; Norilsk-Talnakh deposits; shallow dike-sill transition; Siberian LIP; sulfide-laden magma; two-stage assimilation
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187304
作者单位	Department of Earth Sciences, Carleton University, Herzberg Laboratories, Ottawa, ON, Canada
推荐引用方式 GB/T 7714	Yao Z.-S.,Mungall J.E.. Linking the Siberian Flood Basalts and Giant Ni-Cu-PGE Sulfide Deposits at Norilsk[J],2021,126(3).
APA	Yao Z.-S.,&Mungall J.E..(2021).Linking the Siberian Flood Basalts and Giant Ni-Cu-PGE Sulfide Deposits at Norilsk.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Yao Z.-S.,et al."Linking the Siberian Flood Basalts and Giant Ni-Cu-PGE Sulfide Deposits at Norilsk".Journal of Geophysical Research: Solid Earth 126.3(2021).