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GEOREF RECORD
Timing of emplacement of the sapphire-bearing Yogo Dike, Little Belt Mountains, Montana
Stephen S. Harlan
Timing of emplacement of the sapphire-bearing Yogo Dike, Little Belt Mountains, Montana
Economic Geology and the Bulletin of the Society of Economic Geologists (October 1996) 91 (6): 1159-1162
Timing of emplacement of the sapphire-bearing Yogo Dike, Little Belt Mountains, Montana
Economic Geology and the Bulletin of the Society of Economic Geologists (October 1996) 91 (6): 1159-1162
Index Terms/Descriptors
- absolute age
- Ar/Ar
- Cenozoic
- corundum deposits
- Cretaceous
- dates
- dikes
- emplacement
- gems
- igneous activity
- intrusions
- Little Belt Mountains
- Mesozoic
- mica group
- Montana
- North America
- oxides
- phlogopite
- precision
- Rocky Mountains
- sapphire
- sheet silicates
- silicates
- Tertiary
- U. S. Rocky Mountains
- ultramafic composition
- United States
- Upper Cretaceous
- Yogo Dike
- Yogo sapphire field
Latitude & Longitude
Abstract
The lamprophyre Yogo dyke is associated with an igneous intrusion which is probably Tertiary in age. The geology, methods and results are discussed. The date of the dyke is approximately 48.66 m.y.
ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 91
Serial Issue: 6
Title: Timing of emplacement of the sapphire-bearing Yogo Dike, Little Belt Mountains, Montana
Author(s): Harlan, Stephen S.
Affiliation: U. S. Geological Survey,
Denver, CO,
United States
Pages: 1159-1162
Published: 199610
Text Language: English
Publisher: Economic Geology Publishing Company,
Lancaster, PA,
United States
References: 19
Accession Number: 1997-026472
Categories: Economic geology, geology of nonmetal depositsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N46°34'60" - N47°10'00", W111°19'60" - W109°52'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199709
Program Name: USGSOPNon-USGS publications with USGS authors
