Characteristics and Zonation of Skarn Minerals in Galinge Iron Deposit, Qinghai Province
详细信息
- 责任者：Yu Miao (School of Earth Sciences and Resources ; China University of Geoscience ; Beijing 100083 ; China) ; Feng Chengyou
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(1)
- 关键词：铁矿 ; iron ores ; 围岩蚀变 ; wall-rock alteration ; 青海 ; Qinghai Province
- 页码：p.55-76
- 图表：illus., 9 tables, 55 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The Galinge skarn iron polymetallic ore deposit of western Qinghai Province lies in central Qimantag metallogenic belt.Ore bodies are located in the contact zone between granodiorites,adamellite and dolomitic marble and in the marble and altered andesites which are distributed along the NWW-striking rupture structural fracture zone in the exocontact zone.From the invading contact zone to the east,the zonation of skarn minerals is obvious and can be mainly divided into three ore-bearing skarn zones:magnesian skarn zone with Fe,calcium skarn zone with Fe and Cu and manganoan-calcium skarn zone with Fe,Pb and Zn.The main skarn minerals in the magnesian skarn zone include forsterite and its altered serpentine,chondrodite,diopsite and chinochlorite,and the main metal mineral is magnetite;the calcium skarn is composed of hastingsite,ferroactinolite,hedenbergite,delessite,apatite and andesine,and the associated metal minerals are magnetite,pyrrhotite and a little chalcopyrite;the skarn minerals related to the manganoan-calcium skarn zone are manganhedenbergite,andradite,grossular,brunsvigite,epidote,wollastonite,apatite and anorthite,and the metal minerals are composed of galena,sphalerite,magnetite and pyrrhotite.Based on mineral assemblages,the authors divide the metallogenic periods into skarn period,hydrothermal period and sulfide period.Different periods have different stages:the skarn period is divided into early and late stage.The main chemical composition of early stages of skarn period is grossular(Gro67~99) and diopsite(Di96~98);The main chemical composition of the late stage of skarn is andradite(Ad78~98) and hedenbergite(Hd68~84).Through a comparison with the deposits in eastern China,the authors have found that manganoan-calcium skarn zone is a transitional type to the manganoan skarn zone,and it has the guiding significance in search for mineralization type related to the manganoan skarn.
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