Tourmalinites in the Aphebian Mistassini Group, Quebec

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doi: 10.1139/e87-080
Authors:Chown, E. H.
Author Affiliations:Primary:
Univ. Qué à Chicoutimi, Dép. Sci. Terre, Chicoutimi, QC, Canada
Volume Title:Canadian Journal of Earth Sciences Revue Canadienne des Sciences de la Terre
Source:Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre, 24(4), p.826-830. Publisher: National Research Council of Canada, Ottawa, ON, Canada. ISSN: 0008-4077
Publication Date:1987
Note:In English with French summary. 15 refs.; illus. incl. sketch maps
Summary:Tourmalinites, or fine-grained sedimentary rocks containing 15-20% or more tourmaline, occur within the Papaskwasati formation of the Aphebian Mistassini group. The formation, which is largely composed of fluvial sandstones and conglomerates with minor argillite beds, was deposited in a restricted embayment close to the transition into marine carbonates. Concentrations of tourmaline are limited to fine-grained sediments and intraclasts, and fine sedimentary structures are preserved within the resulting tourmalinites. This suggests that the tourmalinites formed from pre-existing boron-rich muds. It is unlikely that the muds were formed from sea-floor hydrothermal emanations, as no hydrothermal manifestations or penecontemporaneous volcanism is known to be associated with this formation. An evaporitic origin for the tourmalinites is consistent with both the sabkha conditions postulated for the origin of nearby carbonates and the limited areal extent of the sedimentary basin. (Author's abstract) [J.M.H.]
Subjects:Aphebian; Depositional environment; Facies; Fines; Greenschist facies; Metamorphic rocks; Metasedimentary rocks; Paleoproterozoic; Precambrian; Proterozoic; Ring silicates; Schists; Sebkha environment; Sedimentary petrology; Sedimentary structures; Sedimentation; Silicates; Terrestrial environment; Tourmaline group; Tourmalinite; Upper Precambrian; Canada; Eastern Canada; Quebec; Central Quebec; Environment; Mistassini Group; Papaskwasati Formation
Abstract Numbers:88M/0984
Record ID:1987069272
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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