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dc.contributor.author
Fosdick, Julie C.
dc.contributor.author
Stevens Goddard, Andrea L.
dc.contributor.author
Mackaman Lofland, Chelsea
dc.contributor.author
Lossada, Ana Clara
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dc.contributor.author
Rodríguez, María Pía
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dc.contributor.author
Carrapa, Barbara
dc.date.available
2024-07-26T09:44:27Z
dc.date.issued
2024-06
dc.identifier.citation
Fosdick, Julie C.; Stevens Goddard, Andrea L.; Mackaman Lofland, Chelsea; Lossada, Ana Clara; Rodríguez, María Pía; et al.; Eocene exhumation of the High Andes at ∼30°S differentiated by detrital multimethod U-Pb-He thermochronology; Geological Society of America; Geology; 6-2024; 1-5
dc.identifier.issn
0091-7613
dc.identifier.uri
http://hdl.handle.net/11336/240913
dc.description.abstract
The southern Central Andes (∼25−40°S) exhibit a complex tectonic history, crucial for understanding orogenic processes in subduction-related orogens, yet debate on the timing and mechanisms of early Cenozoic topographic growth persists. We present double-dated detrital zircon U-Pb and (U-Th)/He thermochronology data from the early Oligocene−Miocene Bermejo Basin at ∼30°S to investigate source unroofing during development of the High Andes. (U-Th)/He results yield dates of ca. 565−16 Ma (n = 73), with distinct detrital modes that indicate a mixing of sediment sources characterized by variable cooling and exhumation histories. We employ a novel approach for modeling detrital thermochronology data that leverages the shared basin subsidence history of multiple detrital modes to resolve provenance and source unroofing histories. Results from the lower Oligocene Vallecito Formation (northwestern Argentina) reveal that detritus was sourced from Permian−Triassic Choiyoi Group rocks that underwent rapid late Eocene cooling, indicated by short lag time (2−5 m.y.) between source cooling and deposition. Our findings are consistent with bedrock studies of Eocene exhumation in the High Andes and establish source-to-basin connectivity during this time. Other detrital modes with pre-Cenozoic cooling histories were derived from Carboniferous Elqui-Colangüil and Choiyoi Group rocks or recycled from Paleozoic basins. We propose that an early Oligocene drainage divide in the High Andes was located west of the Punilla−La Plata fault, an active thrust front at ∼30°S. These findings challenge Paleogene neutral stress-state models for the Andes and underscore the importance of improved knowledge of erosion and deformation histories for refining models of Andean orogenesis.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Geological Society of America
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
EOCENE EXHUMATION
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HIGH ANDES
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DETRITAL MODES
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U-PB-HE THERMOCHRONOLOGY
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Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Eocene exhumation of the High Andes at ∼30°S differentiated by detrital multimethod U-Pb-He thermochronology
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-07-23T15:21:07Z
dc.journal.pagination
1-5
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Boulder
dc.description.fil
Fil: Fosdick, Julie C.. University of Connecticut; Estados Unidos
dc.description.fil
Fil: Stevens Goddard, Andrea L.. Indiana University; Estados Unidos
dc.description.fil
Fil: Mackaman Lofland, Chelsea. Denison University;
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Fil: Lossada, Ana Clara. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
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Fil: Rodríguez, María Pía. Universidad Andrés Bello; Chile
dc.description.fil
Fil: Carrapa, Barbara. University of Arizona; Estados Unidos
dc.journal.title
Geology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/geology/article/doi/10.1130/G52272.1/645221/Eocene-exhumation-of-the-High-Andes-at-30-S
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1130/G52272.1
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