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GEOREF RECORD

Transfer of the Argentine Precordillera terrane from Laurentia; constraints from detrital-zircon geochronology

William A. Thomas, Ricardo A. Astini, Paul A. Mueller, George E. Gehrels and Joseph L. Wooden
Transfer of the Argentine Precordillera terrane from Laurentia; constraints from detrital-zircon geochronology
Geology (Boulder) (November 2004) 32 (11): 965-968

Abstract

Ages from U-Pb and (super 207) Pb/ (super 206) Pb analyses of detrital zircons from synrift sandstone in the Lower Cambrian Cerro Totora Formation of the Argentine Precordillera have strong similarities to those from late synrift sandstones in the Lower Cambrian Rome Formation of southern Laurentia (Alabama). Ages of detrital zircons from the Cerro Totora sample cluster at 1160-970 Ma (60% of analyzed zircons), 1490-1300 Ma (24%), and 1890-1640 Ma (16%). Ages from two Rome samples cluster at 1240-970 Ma (32% of analyzed zircons), 1540-1270 Ma (31%), 1840-1610 Ma (14%), 1970-1890 Ma (5%), and 2930-2310 Ma (18%). The ages of detrital zircons from the Rome and Cerro Totora sandstones are consistent with sediment supply from the Grenville and older Proterozoic Laurentian provinces, and the older cluster in the Rome sandstones corresponds in age to the Laurentian Archean Superior province. Neither the Rome nor Cerro Totora samples include components younger than Grenville, and the lack of zircons from distinctly Gondwanan provinces is consistent with a Laurentian provenance. The detrital-zircon ages support previous interpretations that the Precordillera was rifted from the Ouachita embayment of Laurentia during Early Cambrian time and subsequently was transferred to Gondwana.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 32
Serial Issue: 11
Title: Transfer of the Argentine Precordillera terrane from Laurentia; constraints from detrital-zircon geochronology
Affiliation: University of Kentucky, Department of Geological Sciences, Lexington, KY, United States
Pages: 965-968
Published: 200411
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 42
Accession Number: 2004-084079
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2004157
Illustration Description: illus. incl. geol. sketch maps
N33°00'00" - N34°30'00", W87°00'00" - W85°30'00"
S29°30'00" - S29°25'00", W68°45'00" - W68°37'00"
Secondary Affiliation: Universidad Nacional de Cordoba, ARG, ArgentinaUniversity of Florida, USA, United StatesUniversity of Arizona, USA, United StatesU. S. Geological Survey, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200424
Program Name: USGSOPNon-USGS publications with USGS authors
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