Fluid inclusion chemistry as a guide to tin mineralization in the Dartmoor Granite, South-west England

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doi: 10.1016/0375-6742(92)90078-M
Authors:Alderton, David H. M.; Rankin, Andrew H.; Thompson, Michael
Author Affiliations:Primary:
RHB New College (London University), Department of Geology, Egham, United Kingdom
Other:
Kingston Polytechnic, United Kingdom
Volume Title:Journal of Geochemical Exploration
Source:Journal of Geochemical Exploration, 46(2), p.163-185. Publisher: Elsevier, Amsterdam-New York, International. ISSN: 0375-6742
Publication Date:1992
Note:In English. 37 refs.; illus. incl. sects., 3 tables, geol. sketch maps
Summary:Sixty-two quartz samples were separated from stream sediments draining the Dartmoor granite and analysed chemically using the ICP-linked decrepitation technique. The samples came from three environments: an area of Sn-Fe vein mineralization, a region of granite peripheral to the mineralized area and a region of granite devoid of mineralization. On a local scale, the fluid inclusion decrepitates in samples from the mineralized region show relatively higher concentrations of Rb, B, Sn, Cu, and S, and low concentrations of Na, K, Ca, Fe, Li, Ba, Sr, and Zn. Principal component analysis of the whole multi-element data set confirms that Rb, B, Sn, Cu, and S behave independently of the major constituents of the fluid inclusion decrepitates and may represent a 'mineralization' factor. Discriminant function analysis, using the concentrations of Na, Ca, S, Ba, Sr, and Rb, is able to separate the samples into three groups. The regional variation in chemistry of the fluid inclusion decrepitates can be explained by invoking two main sources of quartz for the stream sediments: veins associated with the mineralization; and the unaltered granite. The fluids in the latter also seem to show a regional variation. The results of the study indicate that the multi- element chemical analysis of fluid inclusion decrepitates may be a visible method of geochemical exploration for granite-hosted Sn deposits. [R.E.S.]
Subjects:Fluid inclusions; Geochemical methods; Inclusions; Iron ores; Metal ores; Metals; Mineral exploration; Ore-forming fluids; Stream sediments; Tin ores; Trace elements; Dartmoor; Devon England; England; Europe; Great Britain; South-West England; United Kingdom; Western Europe; Dartmoor Granite
Abstract Numbers:93M/3207
Record ID:1993002606
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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