气候变化领域集成服务门户(CCPortal): A revised classification scheme of pyrite in the Witwatersrand Basin and application to placer gold deposits

CCPortal

DOI	10.1016/j.earscirev.2019.103064
	A revised classification scheme of pyrite in the Witwatersrand Basin and application to placer gold deposits
	da Costa G.; Hofmann A.; Agangi A.
发表日期	2020
ISSN	00128252
卷号	201
英文摘要	Pyrite is the most abundant ore mineral in gold-bearing quartz pebble conglomerates (QPCs) of the Witwatersrand Basin and similar Archaean sedimentary units. Much of the pyrite in Archaean conglomerates is detrital in origin, implying that it survived weathering, transport, and reworking under anoxic conditions. Detrital pyrite is generally found together with authigenic pyrite formed in situ as a result of syn- to post-depositional processes. As pyrite is frequently associated with gold mineralization, many authors have developed different pyrite classification schemes in order to better understand the nature and origin of the mineralization, although the different classifications cannot always be easily compared as they are largely based on inferred pyrite genesis. We propose a revised, entirely descriptive classification scheme for detrital and authigenic pyrite in Archaean QPCs. The scheme was created in order to provide a consistent framework for the petrographic description of pyrite in clastic sedimentary rocks. Detrital pyrite is subdivided into massive, inclusion-bearing, and coarsely crystalline types. Authigenic pyrite includes euhedral, overgrowth, infill, aggregate, and pseudomorphic types. We evaluate the methods used in pyrite classification, propose formation pathways for detrital and authigenic pyrites, and apply the classification scheme to some well-known occurrences of detrital pyrite-bearing conglomerates. © 2019 Elsevier B.V.
关键词	Archaean Detrital pyrite Gold mineralization Witwatersrand Basin
英文关键词	Archean; authigenic mineral; classification; conglomerate; detrital deposit; gold; mineralization; placer deposit; pyrite; South Africa; Witwatersrand
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/203676
作者单位	Department of Geology, University of Johannesburg, Auckland Park, 2006, South Africa; Department of Earth Resource Science, Akita University, Akita, 010-8502, Japan
推荐引用方式 GB/T 7714	da Costa G.,Hofmann A.,Agangi A.. A revised classification scheme of pyrite in the Witwatersrand Basin and application to placer gold deposits[J],2020,201.
APA	da Costa G.,Hofmann A.,&Agangi A..(2020).A revised classification scheme of pyrite in the Witwatersrand Basin and application to placer gold deposits.Earth Science Reviews,201.
MLA	da Costa G.,et al."A revised classification scheme of pyrite in the Witwatersrand Basin and application to placer gold deposits".Earth Science Reviews 201(2020).