Geology of the Moreton's Harbour area, Newfoundland with emphasis on the environment and mode of formation of the arsenopyrite veins

Gibbons, Rex Vincent (1969) Geology of the Moreton's Harbour area, Newfoundland with emphasis on the environment and mode of formation of the arsenopyrite veins. Masters thesis, Memorial University of Newfoundland.

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    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
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Abstract

Basic volcanic rocks of Ordovician age near Moreton's Harbour, Newfoundland (pillow lavas, massive flows, and pyroclastic rocks) are intruded by numerous basic and acidic dykes. The rocks are cut by a network of thin veins containing abundant arsenopyrite and some stibnite, associated with pyrite, pyrrhotite, and minor sphalerite, galena, and chalcopyrite. In a few veins, stibnite predominates. Both arsenopyrite and stibnite veins have been mined on a small scale for their associated gold content. The widespread arsenopyrite has been used to determine P-T conditions of formations of the veins, applying the methods of L.A. Clark and A.H. Clark. -- X-ray diffraction analysis of 30 specimens shows that the arsenic content of the arsenopyrite varies between 30 and 34 atomic per cent (d131 spacing from 1.6301 to 1.6338Å.), indicating that the probable temperature range of crystallization extended from about 610°C to 390°C under confining pressures of 1500 bars. -- The hydrothermal veins are related structurally to the acidic dykes (the most competent rock in the area) and genetically to granodioritic intrusive rocks of Devonian age outcropping about five miles east of Moreton's Harbour.

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/6898
Item ID: 6898
Additional Information: Bibliography: leaves 162-164.
Department(s): Science, Faculty of > Earth Sciences
Date: 1969
Date Type: Submission
Geographic Location: Canada--Newfoundland and Labrador--Moreton's Harbour Region; Canada--Newfoundland and Labrador--New World Island
Library of Congress Subject Heading: Geology--Newfoundland and Labrador--Moreton's Harbour; Geology, Stratigraphic--Ordovician

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