Development of complex, granite-hosted, tin-bearing fracture systems in Southwest England; applications of fluid inclusion microfracture studies

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Authors:Dominy, Simon C.; Bussell, M. Andrew; Camm, G. Simon
Author Affiliations:Primary:
University of Greenwich, Medway Towns Campus, School of Earth Sciences, Chatham Maritime, United Kingdom
Volume Title:Transactions - Institution of Mining and Metallurgy. Section B: Applied Earth Science
Source:Transactions - Institution of Mining and Metallurgy. Section B: Applied Earth Science, Vol.105, p.139-144. Publisher: Institution of Mining and Metallurgy, London, United Kingdom. ISSN: 0371-7453
Publication Date:1996
Note:In English. 23 refs.; illus., incl. block diag., sect., sketch maps
Summary:Studies show that the fluid inclusion-containing microfractures which are a common feature of the granites of SW England are an important pathway for fluids and provide a marker for palaeo-fluid flow. The overprinting of these microfractures provides a reliable representation of the evolution of the hydrothermal fluids in a vein system. The data presented reveal the characteristics of the hydrothermal systems from early magmatic fluids to late-stage meteoric and basinal brine fluid input. Correlation of micro- and macro-structures provide reliable evidence for modelling the development of complex vein systems. Microfracture density studies give a good indication of palaeo-permeability, which has clear implications for the controls on the intensity and location/persistence of wallrock alteration. Interpretation of geological control is essential for the effective exploration and development of vein-Sn deposits. The use of microfractures can be of help in exploration where macroscopic markers are absent. [R.E.S.]
Subjects:Development; Fluid inclusions; Fractures; Geometry; Granites; Host rocks; Hydraulic fracturing; Igneous rocks; Inclusions; Mechanism; Metal ores; Mineral exploration; Paragenesis; Plutonic rocks; Preferred orientation; Reactivation; Structural analysis; Textures; Tin ores; Veins; Cornwall England; England; Europe; Great Britain; South-West England; United Kingdom; Western Europe; Evolution; Rosevale Mine; South Crofty Mine; Wheal Pendarves Mine
Coordinates:N495600 N513000 W0023500 W0054500
Abstract Numbers:97M/1385
Record ID:1999027777
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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