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Indium mineralisation in A-type granites in southeastern Finland: insights into mineralogy and partitioning between coexisting minerals

Citation

Cook, NJ and Sundblad, K and Valkama, M and Nygard, R and Ciobanu, CL and Danyushevsky, L, Indium mineralisation in A-type granites in southeastern Finland: insights into mineralogy and partitioning between coexisting minerals, Chemical Geology: An International Journal, 284, (1-2) pp. 62-73. ISSN 0009-2541 (2011) [Refereed Article]


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DOI: doi:10.1016/j.chemgeo.2011.02.006

Abstract

Several promising exploration targets in the western parts of the Wiborg batholith, southeastern Finland, have been studied with respect to Zn, In, Ag, As, Sn and Cu. Ores occur both as massive In-bearing magnetite–sphalerite (Getmossmalmen), as greisen-style veins (Jungfrubergen) and as Cu-dominant polymetallic quartz veins (Korsvik-1 and -2, Sarvlaxviken area). The Cu-dominant (chalcopyrite–bornite), Zn-poor quartz veins are characterised by high In/Zn ratios (> 3000); roquesite (CuInS2) being a major indium-carrier, alongside sphalerite, chalcopyrite and arsenopyrite. In contrast, sphalerite is the dominant In-carrier in the greisen veins and massive ores characterised by lower In/Zn ratios (< 100). In such cases, it appears that all indium partitioned into sphalerite at concentrations of 500–1500 ppm, and no roquesite formed. In the veins of the Sarvlaxviken area, we observe the exsolution of a high-temperature precursor sulphide to form co-existing sphalerite and roquesite. These exsolution textures extend down to the sub-microscopic scale and there is no evidence of extensive solid solution along the ZnS–CuInS2 join beyond a couple of wt.% In (and Cu) in sphalerite. The co-existing roquesite is close to an ideal composition and contains ěm-scale exsolutions of sphalerite, indicating negligible solid solution at the CuInS2 end of the join. The new data are compared with the published data on the mineralogical distribution of the indium in sulphide ores.

Item Details

Item Type:Refereed Article
Keywords:indium, sphalerite, roquesite, element partitioning, Finland
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Precious (Noble) Metal Ore Exploration
Author:Danyushevsky, L (Professor Leonid Danyushevsky)
ID Code:74864
Year Published:2011
Web of Science® Times Cited:29
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2011-12-14
Last Modified:2012-11-12
Downloads:3 View Download Statistics

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