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Apatite triple dating and white mica (super 40) Ar/ (super 39) Ar thermochronology of syntectonic detritus in the Central Andes; a multiphase tectonothermal history

B. Carrapa, P. G. DeCelles, P. W. Reiners, G. E. Gehrels and M. Sudo
Apatite triple dating and white mica (super 40) Ar/ (super 39) Ar thermochronology of syntectonic detritus in the Central Andes; a multiphase tectonothermal history
Geology (Boulder) (May 2009) 37 (5): 407-410

Abstract

We applied apatite U-Pb, fission track, and (U-Th)/He triple dating and white mica (super 40) Ar/ (super 39) Ar thermochronology to syntectonic sedimentary rocks from the central Andean Puna plateau in order to determine the source-area geochronology and source sedimentary basin thermal histories, and ultimately the timing of multiple tectonothermal events in the Central Andes. Apatite triple dating of samples from the Eocene Geste Formation in the Salar de Pastos Grandes basin shows late Precambrian-Devonian apatite U-Pb crystallization ages, Eocene apatite fission track (AFT), and Eocene-Miocene (U-Th)/He (ca. 8-47 Ma) cooling ages. Double dating of cobbles from equivalent strata in the Arizaro basin documents early Eocene (46.2+ or -3.9 Ma) and Cretaceous (107.6+ or -7.6, 109.5+ or -7.7 Ma) AFT and Eocene-Oligocene (ca. 55-30 Ma) (U-Th)/He ages. Thermal modeling suggests relatively rapid cooling between ca. 80 and 50 Ma and reheating and subsequent diachronous basin exhumation between ca. 30 Ma and 5 Ma. The (super 40) Ar/ (super 39) Ar white mica ages from the same samples in the Salar de Pastos Grandes area are mainly 400-350 Ma, younger than apatite U-Pb ages, suggesting source-terrane cooling and exhumation during the Devonian-early Carboniferous. Together these data reveal multiple phases of mountain building in the Paleozoic and Cenozoic. Basin burial temperatures within the plateau were limited to <80 degrees C and incision occurred diachronously during the Cenozoic.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 37
Serial Issue: 5
Title: Apatite triple dating and white mica (super 40) Ar/ (super 39) Ar thermochronology of syntectonic detritus in the Central Andes; a multiphase tectonothermal history
Affiliation: University of Wyoming, Department of Geology and Geophysics, Laramie, WY, United States
Pages: 407-410
Published: 200905
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 30
Accession Number: 2009-050000
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2009103
Illustration Description: illus. incl. strat. col., geol. sketch map
S26°00'00" - S24°00'00", W68°00'00" - W66°00'00"
Secondary Affiliation: University of Arizona, USA, United StatesUniversitaet Potsdam, DEU, Federal Republic of Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200927
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