气候变化领域集成服务门户(CCPortal): The geotectonic setting, age and mineral deposit inventory of global layered intrusions

CCPortal

DOI	10.1016/j.earscirev.2021.103736
	The geotectonic setting, age and mineral deposit inventory of global layered intrusions
	Smith W.D.; Maier W.D.
发表日期	2021
ISSN	00128252
卷号	220
英文摘要	In the present paper, we have compiled data on 565 layered and differentiated igneous intrusions globally, documenting their (i) location, (ii) age, (iii) size, (iv) geotectonic setting, (v) putative parent magma(s), (vi) crystallisation sequence, and (vii) mineral deposits. Most studied intrusions occur in Russia (98), Australia (72), Canada (52), Finland (37), South Africa (38), China (33), and Brazil (31). Notable clusters of: (i) Archaean intrusions (~ 15%) include those of the McFaulds Lake Area (commonly known as the Ring of Fire, Canada), Pilbara and Yilgarn cratons (Australia), and Barberton (South Africa); (ii) Proterozoic intrusions (~ 56%) include those of the Giles Event and Halls Creek Orogen (Australia), Kaapvaal craton and its margin (South Africa and Botswana), Kola and Karelia cratons (Finland and Russia), and Midcontinent Rift (Canada and USA); and (iii) Phanerozoic intrusions (~ 29%) include those of eastern Greenland, the Central Asian Orogenic Belt (China and Mongolia) and Emeishan large igneous province (China). Throughout geological time, the occurrence of many layered intrusions correlate broadly with the amalgamation and break-up of supercontinents, yet the size and mineral inventory of intrusions shows no obvious secular changes. In our compilation, 337 intrusions possess one or more types of mineral occurrences, including: (i) 107 with stratiform PGE reef-style mineralisation, (ii) 138 with Ni-Cu-(PGE) contact-style mineralisation, (iii) 74 with stratiform Fe-Ti-V-(P) horizons, and (iv) ≥ 35 with chromitite seams. Sill-like or chonolithic differentiated intrusions present in extensional tectonic settings and spanning geological time are most prospective for Ni-Cu-(PGE) mineralisation. In contrast, PGE reef-style deposits are most prevalent in larger, commonly lopolithic intrusions that are generally >1 Ga in age (~ 75%). Stratiform Fe-Ti-V-(P) horizons are most common in the central and upper portions of larger layered intrusions, occurring in the Archaean and Phanerozoic. Approximately 80% of intrusions with chromitite seams are older than 1 Ga and > 50% of them also contain PGE reefs. Based on the distribution of layered intrusions in relatively well explored terranes (e.g., Finland, South Africa, Western Australia), we propose that many layered intrusions remain to be discovered on Earth, particularly in poorly explored and relatively inaccessible regions of Africa, Australia, Russia, Greenland, Antarctica, South America, and northern Canada. © 2021
关键词	Compilation Igneous petrology Layered intrusions Mineralisation Ore deposit
英文关键词	continental breakup; crystallization; igneous rock; layered intrusion; magma; mineral deposit; mineralization; petrology; supercontinent; tectonic setting; Australia; Brazil; Canada; China; Finland; Russian Federation; South Africa
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/204137
作者单位	School of Earth and Environmental Sciences, Cardiff University, United Kingdom
推荐引用方式 GB/T 7714	Smith W.D.,Maier W.D.. The geotectonic setting, age and mineral deposit inventory of global layered intrusions[J],2021,220.
APA	Smith W.D.,&Maier W.D..(2021).The geotectonic setting, age and mineral deposit inventory of global layered intrusions.Earth Science Reviews,220.
MLA	Smith W.D.,et al."The geotectonic setting, age and mineral deposit inventory of global layered intrusions".Earth Science Reviews 220(2021).