Crosscourses in South Crofty Mine, Cornwall; further studies of paragenesis and structure

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Authors:Dominy, S. C.; Scrivener, R. C.; Le Boutillier, N.; Bussell, M. A.; Halls, C.
Author Affiliations:Primary:
University of Greenwich, School of Earth Sciences, London, United Kingdom
British Geological Survey, Canada
South Crofty Mine, United Kingdom
Imperial College, United Kingdom
Volume Title:Proceedings of the Ussher Society
Source:Proceedings of the Ussher Society, Vol.8(Part 3), p.237-241. Publisher: Ussher Society, Bristol, United Kingdom. ISSN: 0566-3954
Publication Date:1994
Note:In English. Read at the annual conference of the Ussher Society, Jan. 1994. 29 refs.; illus., incl. geol. sketch maps
Summary:The composite-tin-bearing lodes at South Crofty are cut by a series of crosscourse structures in sub-vertical strike-slip faults that displace the tin lodes by up to 110 m. Fluid inclusion studies in quartz from an extensional crosscourse reveal Th in the range of << 100 to 175°C and salinities in the range << 1 to 23 eq wt.% NaCl; some inclusions contain a CaCl2 component and may represent basinal brines with CaCl2/NaCl ratios of ∼ 1.2. The basinal brines are believed to have been derived from an adjacent sedimentary basin during strike-slip faulting. [R.A.H.]
Subjects:Brines; Faults; Fluid inclusions; Fractured materials; Fractures; Geochronology; Hydrothermal alteration; Inclusions; Metal ores; Metasomatism; P-T conditions; Paragenesis; Rb/Sr; Strike-slip faults; Tin ores; Veins; Cornwall England; England; Europe; Great Britain; United Kingdom; Western Europe; South Crofty Mine; The Great Crosscourse
Coordinates:N494300 N505000 W0041500 W0065600
Abstract Numbers:95M/1478
Record ID:2017056675
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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