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GEOREF RECORD
Pegmatites of Montana
Eberhardt William Heinrich
Pegmatites of Montana
Economic Geology and the Bulletin of the Society of Economic Geologists (June 1949) 44 (4): 307-335
Pegmatites of Montana
Economic Geology and the Bulletin of the Society of Economic Geologists (June 1949) 44 (4): 307-335
Index Terms/Descriptors
Latitude & Longitude
Abstract
Montana pegmatites are of three main age groups: pre-Beltian, both metamorphosed and unmetamorphosed types; Laramide, associated with the Boulder batholith; and Tertiary, related to scattered alkalic stocks and small intrusives. Deposits of sillimanite, kyanite, corundum, mica, fergusonite, and chromite occur with pre-Beltian pegmatites. Laramide pegmatites contain graphite, mica, feldspar, gem amethyst, and rose quartz. Syenitic Tertiary pegmatites are characterized by numerous unusual minerals and by associated vermiculite deposits.
ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 44
Serial Issue: 4
Title: Pegmatites of Montana
Author(s): Heinrich, Eberhardt William
Pages: 307-335
Published: 194906
Text Language: English
Publisher: Economic Geology Publishing Company,
Lancaster, PA,
United States
Accession Number: 1949-007268
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N44°30'00" - N49°00'00", W116°01'60" - W104°01'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1949
