干旱区生态环境知识资源中心(Arid): Using weathering and alteration minerals to constrain water table movement and supergene enrichment of porphyry copper deposits in the Central Andes

Arid

	Using weathering and alteration minerals to constrain water table movement and supergene enrichment of porphyry copper deposits in the Central Andes
	Shaw, J. M.; Cooper, F. J.; Boyce, A. J.; Farley, K. A.; Evenstar, L.
通讯作者	Shaw, JM (corresponding author), Univ Bristol, Sch Earth Sci, Bristol, Avon, England.
会议名称	15th SGA Biennial Meeting on Life with Ore Deposits on Earth
会议日期	AUG 27-30, 2019
会议地点	Univ Glasgow, Glasgow, SCOTLAND
英文摘要	The Atacama Desert of northern Chile hosts many of the world's largest porphyry copper deposits (PCDs), many of which have been upgraded through supergene enrichment (Sillitoe and McKee 1996). Enrichment of exhumed PCDs occurs in the near-surface weathering environment, when copper is leached from primary sulphides and reprecipitated beneath the water table to form a concentrated blanket of secondary copper minerals (e.g. chalcocite). The Atacama is one of the driest regions on Earth, but supergene enrichment requires precipitation to drive the aqueous redistribution of metals. Previous alunite dating studies have suggested enrichment stopped in the middle Miocene, due to an increase in aridity. This conclusion is supported by the youngest supergene alunite ages from several PCDs clustering around 14 Ma (Sillitoe 2005). Hematite also forms in the leached caps of PCDs and hematite (U-Th)/He geochronology provides a tool to track the downward progression of weathering fronts (e.g. Cooper et al. 2016). This study will combine Ar-40/Ar-39 dating of supergene alunite (a proxy for the timing of copper enrichment) with hematite geochronology (as an indicator of the progression of weathering) to better understand the link between water table movement and supergene enrichment of Central Andean PCDs.
来源出版物	LIFE WITH ORE DEPOSITS ON EARTH, PROCEEDINGS OF THE 15TH SGA BIENNIAL MEETING, 2019, VOLS 1-4
出版年	2019
页码	905-908
出版者	SOC GEOLOGY APPLIED MINERAL DEPOSITS-SGA
类型	Proceedings Paper
语种	英语
收录类别	CPCI-S
WOS记录号	WOS:000503111600236
WOS关键词	STABLE-ISOTOPE GEOCHEMISTRY ; NORTHERN CHILE ; AR-40/AR-39 GEOCHRONOLOGY ; ATACAMA-DESERT ; K-AR ; ARIDITY
WOS类目	Geology ; Mining & Mineral Processing
WOS研究方向	Geology ; Mining & Mineral Processing
资源类型	会议论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/370151
作者单位	[Shaw, J. M.; Cooper, F. J.] Univ Bristol, Sch Earth Sci, Bristol, Avon, England; [Boyce, A. J.] SUERC, East Kilbride, Scotland; [Farley, K. A.] CALTECH, Pasadena, CA 91125 USA; [Evenstar, L.] Univ Brighton, Sch Environm & Technol, Brighton, E Sussex, England
推荐引用方式 GB/T 7714	Shaw, J. M.,Cooper, F. J.,Boyce, A. J.,et al. Using weathering and alteration minerals to constrain water table movement and supergene enrichment of porphyry copper deposits in the Central Andes[C]:SOC GEOLOGY APPLIED MINERAL DEPOSITS-SGA,2019:905-908.