Talc-carbonate alteration of some basic and ultrabasic intrusions in Cornwall

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Authors:Power, M. R.; Scott, P. W.
Author Affiliations:Primary:
University of Exeter, Camborne School of Mines, Redruth, Cornwall, United Kingdom
Volume Title:Proceedings of the Ussher Society
Source:Proceedings of the Ussher Society, Vol.8 (Part 4), p.392-397. Publisher: Ussher Society, Bristol, United Kingdom. ISSN: 0566-3954
Publication Date:1995
Note:In English. 23 refs.; illus., incl. 1 table, geol. sketch map
Summary:The igneous bodies at Greystone, Polyphant and Duporth all show variable alteration from minor chloritization to major carbonatization and talcification. A paragenetic sequence can be established. Trace elements show that the variation in concentration of the elements is due to dilution effects caused by the carbonatization event. There is no evidence for differentiation in any of the three bodies. The composition and activity of the alteration fluids appear to have controlled the type of alteration mineral assemblage. Enrichment of As in altered rocks at Greystone is indicative of hydrothermal activity and may be linked to the cross-course that cuts the intrusion. [R.E.S.]
Subjects:Carbonaceous composition; Chemical composition; Geochemistry; Hydrothermal conditions; Intrusions; Mafic composition; Petrology; Sheet silicates; Silicates; Sulfides; Talc; Trace elements; Ultrabasite; X-ray data; Cornwall England; England; Europe; Great Britain; United Kingdom; Western Europe
Abstract Numbers:96M/2238
Record ID:1997058596
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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