干旱区生态环境知识资源中心(Arid): Mineralogy and Geochemistry Studies of the Sorkheh Sediment-hosted Stratiform Copper (SSC) Deposit, NW Iran

Arid

	Mineralogy and Geochemistry Studies of the Sorkheh Sediment-hosted Stratiform Copper (SSC) Deposit, NW Iran
	Hassanpour, Shohreh; Senemari, Saeedeh
通讯作者	Hassanpour, S
来源期刊	IRANIAN JOURNAL OF EARTH SCIENCES
ISSN	2008-8779
EISSN	2228-785X
出版年	2015
卷号	7 期号:2 页码:89-105
英文摘要	The Sorkheh deposit in northwestern Iran exhibits several readily visible general characteristics of sediment-hosted stratiform copper (SSC) mineralization. It consists of fine-grained disseminated base-metal sulfides within gray sandstones (gray beds, the basal whitish Miocene sandstone and shallow-water) that overlie a thick sequence of red beds (Miocene Upper Red Formation). The host gray beds are the basal sandstone and are intercalated with red bed sandstones, which are shown from textural studies to be carbonaceous and to have initially contained very fine-grained, disseminated, syndiagenetic pyrite. The sediment-hosted stratiform copper deposit of the Sorkheh area formed in a location where basinal fluids passed through a series of highly oxidized rocks and could obtained copper, which was then precipitated as the fluids encountered a reductant that destabilized the complexing ability of the fluid. According to the proposed model, the Sorkheh deposit appeared to have begun formation during diagenesis when mineralizing fluids became focused into constrained areas by stratigraphic and/or structural architecture. To form the Sorkheh sediment-hosted stratiform copper deposit, a number of major features must be present: abundant, highly oxidized metal source rocks, highly reduced strata in a position favoring interaction with significant amounts of fluid that previously passed through the oxidized strata package, and significant thicknesses of evaporates capping the reduced strata to serve as a hydrologic seal and a source of high-salinity (and possibly sulfur-rich) brines. Ore-stage sulfides are zoned vertically and obliquely through the mineralized zones, from cupriferous sulfides at low stratigraphic levels to copper-rich mineralization above, with unreplaced pyrite remaining within the upper Miocene. The zoned sulfides and their replacement textures, configuration of the mineralized zones, and the position of ore stage mineralization adjacent to a stratigraphically defined redox transition from red beds upward into graybeds indicate an overprint of copper (and accompanying ore-stage metals) on originally pyritic gray beds. The influx of ore-stage metals, presumably in an oxidized low-temperature brine, terminated with a silicification event that effectively sealed the host sandstones. Consequently, these observations and the overall genetic interpretation are consistent with the general deposit-scale genetic model for early diagenetic SSC mineralization. The regional geologic context is also consistent with its classification as a SSC deposit and is hosted by sediments that were formed in association with evaporates at a low latitude in a Sabkha environment. Source of Sorkheh deposition has been indicated as a sedimentary arid type. Sandstones of the Sorkheh area tectonic settings are obtained in a passive continental margin.
英文关键词	Sediment-hosted stratiform copper Sorkheh Azerbaijan NW Iran
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000436723200001
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/331414
作者单位	[Hassanpour, Shohreh] Payame Noor Univ, Dept Geol, Tehran, Iran; [Senemari, Saeedeh] Imam Khomeini Int Univ, Dept Min, Qazvin, Iran
推荐引用方式 GB/T 7714	Hassanpour, Shohreh,Senemari, Saeedeh. Mineralogy and Geochemistry Studies of the Sorkheh Sediment-hosted Stratiform Copper (SSC) Deposit, NW Iran[J],2015,7(2):89-105.
APA	Hassanpour, Shohreh,&Senemari, Saeedeh.(2015).Mineralogy and Geochemistry Studies of the Sorkheh Sediment-hosted Stratiform Copper (SSC) Deposit, NW Iran.IRANIAN JOURNAL OF EARTH SCIENCES,7(2),89-105.
MLA	Hassanpour, Shohreh,et al."Mineralogy and Geochemistry Studies of the Sorkheh Sediment-hosted Stratiform Copper (SSC) Deposit, NW Iran".IRANIAN JOURNAL OF EARTH SCIENCES 7.2(2015):89-105.