DOI: 10.1016/j.earscirev.2021.103736
论文题名: The geotectonic setting, age and mineral deposit inventory of global layered intrusions
作者: Smith W.D. ; Maier W.D.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2021
卷: 220 语种: 英语
中文关键词: 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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166506
Appears in Collections: 气候变化与战略
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作者单位: School of Earth and Environmental Sciences, Cardiff University, United Kingdom
Recommended Citation:
Smith W.D.,Maier W.D.. The geotectonic setting, age and mineral deposit inventory of global layered intrusions[J]. Earth Science Reviews,2021-01-01,220