Skip to Main Content
Skip Nav Destination
GEOREF RECORD

High-potash dikes in the Homestake Mine, Lead, South Dakota

James Alexander Noble
High-potash dikes in the Homestake Mine, Lead, South Dakota
Bulletin of the Geological Society of America (September 1948) 59 (9): 927-939

Abstract

Widely scattered bodies of Tertiary intrusive porphyry crop out in the northern Black Hills, in greatest abundance in a circular area of about 10-mile radius with Lead and the Homestake Mine at the center. Five rock types are represented: rhyolite; quartz monzonite; monzonite; grorudite; and phonolite. A swarm of rhyolite dikes in the Homestake Mine comprise rocks of two distinct compositional types: so-called low potash rocks with about equal parts of orthoclase, albite, and quartz; and high potash rocks which consist of orthoclase and quartz. There are no ferro-magnesian minerals in either type of rock.


ISSN: 1050-9747
Coden: BUGMAF
Serial Title: Bulletin of the Geological Society of America
Serial Volume: 59
Serial Issue: 9
Title: High-potash dikes in the Homestake Mine, Lead, South Dakota
Pages: 927-939
Published: 194809
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1949-012516
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N42°30'00" - N45°55'00", W104°04'60" - W96°27'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1949
Close Modal

or Create an Account

Close Modal
Close Modal