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A brief description of the pegmatites southwest of Custer, South Dakota

Helen Stobbe
A brief description of the pegmatites southwest of Custer, South Dakota
Economic Geology and the Bulletin of the Society of Economic Geologists (November 1937) 32 (7): 964-973

Abstract

This paper describes a recently opened soda-rich feldspar deposit, the Big Tom, five miles south of Custer, South Dakota. The associated rocks consist of pre-Cambrian schists cut by pegmatite and granite dikes. The minerals found are albite, cleave-landite, microcline-perthite, quartz, muscovite, tourmaline, beryl, amblygonite and columbite. Other commercial feldspar deposits in the vicinity are Tin Mountain, Tricky Claims, and the White Elephant. The dikes in the region are probably genetically related to the Harney Peak granite batholith. Evidence for a hydrothermal phase appears absent, and therefore the pegmatite, as exposed, may have originated from the fractionation of a soda-rich magma.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 32
Serial Issue: 7
Title: A brief description of the pegmatites southwest of Custer, South Dakota
Author(s): Stobbe, Helen
Pages: 964-973
Published: 193711
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
Accession Number: 1939-018290
Categories: Economic geology, general
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 figs. index and geol. sketch maps
N42°30'00" - N45°55'00", W104°04'60" - W96°27'00"
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: 1939
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