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Age of intrusive rocks in northern Hispaniola

Stephen E. Kesler, John F. Sutter, Jackson M. Barton and Robert C. Speck
Age of intrusive rocks in northern Hispaniola (in Geologic and tectonic development of the North America-Caribbean Plate boundary in Hispaniola, Paul Mann (editor), Grenville Draper (editor) and John F. Lewis (editor))
Special Paper - Geological Society of America (1991) 262: 165-172


K-Ar analyses of mineral separates from tonalitic intrusive rocks in the Dominican Republic yield ages of 80 to 82 Ma for the unfoliated Medina stock and Jautia batholith at the southern end of the Cordillera Central. Hornblende separates from the El Bao and Loma de Cabrera unfoliated tonalite batholiths in the northern part of the Cordillera yield ages of about 68 to 70 Ma, although coexisting biotites in two samples are significantly younger. These ages, in combination with published mineral separate and whole-rock ages from the area, suggest that most unfoliated tonalite magma was emplaced from about 87 to 80 Ma and that later, less abundant tonalite magmatism took place at 50 Ma, and possibly at a less well-defined interval between 70 and 50 Ma. Geologic relations, considered in the light of these and other published K-Ar data, indicate that the foliated tonalite magmas were emplaced shortly prior to the 87- to 80-Ma interval. Although all episodes of magmatism are widespread, the distribution of measured ages suggests that most of the tonalitic magma in the southern part of the Cordillera Central was emplaced in the 87- to 80-Ma period, whereas volumetrically important tonalitic magmatism persisted to later periods in the northern segment of the Cordillera Central.

ISSN: 0072-1077
EISSN: 2331-219X
Serial Title: Special Paper - Geological Society of America
Serial Volume: 262
Title: Age of intrusive rocks in northern Hispaniola
Title: Geologic and tectonic development of the North America-Caribbean Plate boundary in Hispaniola
Author(s): Kesler, Stephen E.Sutter, John F.Barton, Jackson M.Speck, Robert C.
Author(s): Mann, Pauleditor
Author(s): Draper, Grenvilleeditor
Author(s): Lewis, John F.editor
Affiliation: University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States
Affiliation: University of Texas at Austin, Institute for Geophysics, Austin, TX, United States
Pages: 165-172
Published: 1991
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2262-4
References: 19
Accession Number: 1992-060977
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
N17°30'00" - N20°00'00", W72°00'00" - W68°19'60"
Secondary Affiliation: Florida International University, Department of Geology, Miami, FL, USA, United StatesGeorge Washington University, Geology Department, Washington, DC, USA, United StatesU. S. Geological Survey, Reston, VA, USA, United StatesRand Afrikaans University, Department of Geology, Johannesburg, ZAF, South AfricaUniversity of Alaska at Fairbanks, Fairbanks, AK, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1992
Program Name: USGSOPNon-USGS publications with USGS authors
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