What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fe...

Autores
Mackaman Lofland, Chelsea; Ketcham, Richard; Fosdick, Julie; Horton, Brian; Lossada, Ana Clara; Stockli, Daniel
Año de publicación
2022
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Flat-slab subduction is acornerstone tectonic process, commonly linked to changes in convergent marginthermal structure, enhanced seismicity, and intraplate shortening and magmatismexpressed hundreds of kilometers from the trench. Yet, the impacts of flat-slabsubduction on hinterland evolution remain poorly understood. We leverage newthermochronological data from the Argentine Frontal Cordillera (a zone of highhinterland topography above the modern flat-slab segment at 29–33ºS) and novelthermal history modeling techniques to interrogate the influence of (1)increased plate coupling, elevated shortening, and structurally-drivenexhumation along emergent or subsurface faults, and/or (2) dynamic upliftassociated with slab flattening and inboard migration of the subduction hinge.New apatite and zircon (U-Th)/He data quantify hinterland cooling duringPaleogene subduction and Neogene flattening of the Nazca oceanic plate. Ourthermal history modeling approach implements a time-elevation extension to the1D HeFTy thermal history modeling program that allows simultaneous inversion ofmultiple samples along a structural or topographic profile. This extensionenables HeFTy to better approximate transient effects such as isothermcompression during rapid exhumation and the transition from geothermal toelevation gradients, and allows for change in the relative depth among samples(e.g., tilting, folding) during the history within user-defined constraints.Multi-sample modeling results from hinterland sample profiles spanning analong-strike distance of >400 km record rapid exhumational cooling coevalwith middle Miocene flattening of the subducted slab, and point tostructurally-driven exhumation: along an orogen-scale fault-bend fold anticlineat 29–31°S, and emergent faults that exhume west-dipping hanging wall panels at~31–33°S. We illustrate the resulting structural, topographic, andthermochronological relationships along two reconstructed 2D geological crosssections using thermokinematic modeling (FETKin software). This researchdemonstrates the utility of multi-sample thermal history modeling in refiningthe results obtained from single-sample modeling approaches, and evaluating thetiming, rates, and drivers of exhumation during changes in subduction.
Fil: Mackaman Lofland, Chelsea. University of Connecticut; Estados Unidos
Fil: Ketcham, Richard. University of Texas; Estados Unidos
Fil: Fosdick, Julie. University of Connecticut; Estados Unidos
Fil: Horton, Brian. University of Texas; Estados Unidos
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
Fil: Stockli, Daniel. University of Texas at Austin; Estados Unidos
Geological Society of America Connects Meeting
Estados Unidos
The Geological Society of America
Materia
EXHUMATION
FLAT SLAB SUBDUCTION
SOUTHERN CENTRAL ANDES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/228257
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/228257
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin softwareMackaman Lofland, ChelseaKetcham, RichardFosdick, JulieHorton, BrianLossada, Ana ClaraStockli, DanielEXHUMATIONFLAT SLAB SUBDUCTIONSOUTHERN CENTRAL ANDEShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Flat-slab subduction is acornerstone tectonic process, commonly linked to changes in convergent marginthermal structure, enhanced seismicity, and intraplate shortening and magmatismexpressed hundreds of kilometers from the trench. Yet, the impacts of flat-slabsubduction on hinterland evolution remain poorly understood. We leverage newthermochronological data from the Argentine Frontal Cordillera (a zone of highhinterland topography above the modern flat-slab segment at 29–33ºS) and novelthermal history modeling techniques to interrogate the influence of (1)increased plate coupling, elevated shortening, and structurally-drivenexhumation along emergent or subsurface faults, and/or (2) dynamic upliftassociated with slab flattening and inboard migration of the subduction hinge.New apatite and zircon (U-Th)/He data quantify hinterland cooling duringPaleogene subduction and Neogene flattening of the Nazca oceanic plate. Ourthermal history modeling approach implements a time-elevation extension to the1D HeFTy thermal history modeling program that allows simultaneous inversion ofmultiple samples along a structural or topographic profile. This extensionenables HeFTy to better approximate transient effects such as isothermcompression during rapid exhumation and the transition from geothermal toelevation gradients, and allows for change in the relative depth among samples(e.g., tilting, folding) during the history within user-defined constraints.Multi-sample modeling results from hinterland sample profiles spanning analong-strike distance of >400 km record rapid exhumational cooling coevalwith middle Miocene flattening of the subducted slab, and point tostructurally-driven exhumation: along an orogen-scale fault-bend fold anticlineat 29–31°S, and emergent faults that exhume west-dipping hanging wall panels at~31–33°S. We illustrate the resulting structural, topographic, andthermochronological relationships along two reconstructed 2D geological crosssections using thermokinematic modeling (FETKin software). This researchdemonstrates the utility of multi-sample thermal history modeling in refiningthe results obtained from single-sample modeling approaches, and evaluating thetiming, rates, and drivers of exhumation during changes in subduction.Fil: Mackaman Lofland, Chelsea. University of Connecticut; Estados UnidosFil: Ketcham, Richard. University of Texas; Estados UnidosFil: Fosdick, Julie. University of Connecticut; Estados UnidosFil: Horton, Brian. University of Texas; Estados UnidosFil: 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"; ArgentinaFil: Stockli, Daniel. University of Texas at Austin; Estados UnidosGeological Society of America Connects MeetingEstados UnidosThe Geological Society of AmericaThe Geological Society of America2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/228257What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software; Geological Society of America Connects Meeting; Estados Unidos; 2022CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://gsa.confex.com/gsa/2022AM/meetingapp.cgi/Paper/381296Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:11:21Zoai:ri.conicet.gov.ar:11336/228257instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:11:21.761CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software
title What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software
spellingShingle What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software
Mackaman Lofland, Chelsea
EXHUMATION
FLAT SLAB SUBDUCTION
SOUTHERN CENTRAL ANDES
title_short What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software
title_full What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software
title_fullStr What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software
title_full_unstemmed What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software
title_sort What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software
dc.creator.none.fl_str_mv Mackaman Lofland, Chelsea
Ketcham, Richard
Fosdick, Julie
Horton, Brian
Lossada, Ana Clara
Stockli, Daniel
author Mackaman Lofland, Chelsea
author_facet Mackaman Lofland, Chelsea
Ketcham, Richard
Fosdick, Julie
Horton, Brian
Lossada, Ana Clara
Stockli, Daniel
author_role author
author2 Ketcham, Richard
Fosdick, Julie
Horton, Brian
Lossada, Ana Clara
Stockli, Daniel
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv EXHUMATION
FLAT SLAB SUBDUCTION
SOUTHERN CENTRAL ANDES
topic EXHUMATION
FLAT SLAB SUBDUCTION
SOUTHERN CENTRAL ANDES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Flat-slab subduction is acornerstone tectonic process, commonly linked to changes in convergent marginthermal structure, enhanced seismicity, and intraplate shortening and magmatismexpressed hundreds of kilometers from the trench. Yet, the impacts of flat-slabsubduction on hinterland evolution remain poorly understood. We leverage newthermochronological data from the Argentine Frontal Cordillera (a zone of highhinterland topography above the modern flat-slab segment at 29–33ºS) and novelthermal history modeling techniques to interrogate the influence of (1)increased plate coupling, elevated shortening, and structurally-drivenexhumation along emergent or subsurface faults, and/or (2) dynamic upliftassociated with slab flattening and inboard migration of the subduction hinge.New apatite and zircon (U-Th)/He data quantify hinterland cooling duringPaleogene subduction and Neogene flattening of the Nazca oceanic plate. Ourthermal history modeling approach implements a time-elevation extension to the1D HeFTy thermal history modeling program that allows simultaneous inversion ofmultiple samples along a structural or topographic profile. This extensionenables HeFTy to better approximate transient effects such as isothermcompression during rapid exhumation and the transition from geothermal toelevation gradients, and allows for change in the relative depth among samples(e.g., tilting, folding) during the history within user-defined constraints.Multi-sample modeling results from hinterland sample profiles spanning analong-strike distance of >400 km record rapid exhumational cooling coevalwith middle Miocene flattening of the subducted slab, and point tostructurally-driven exhumation: along an orogen-scale fault-bend fold anticlineat 29–31°S, and emergent faults that exhume west-dipping hanging wall panels at~31–33°S. We illustrate the resulting structural, topographic, andthermochronological relationships along two reconstructed 2D geological crosssections using thermokinematic modeling (FETKin software). This researchdemonstrates the utility of multi-sample thermal history modeling in refiningthe results obtained from single-sample modeling approaches, and evaluating thetiming, rates, and drivers of exhumation during changes in subduction.
Fil: Mackaman Lofland, Chelsea. University of Connecticut; Estados Unidos
Fil: Ketcham, Richard. University of Texas; Estados Unidos
Fil: Fosdick, Julie. University of Connecticut; Estados Unidos
Fil: Horton, Brian. University of Texas; Estados Unidos
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
Fil: Stockli, Daniel. University of Texas at Austin; Estados Unidos
Geological Society of America Connects Meeting
Estados Unidos
The Geological Society of America
description Flat-slab subduction is acornerstone tectonic process, commonly linked to changes in convergent marginthermal structure, enhanced seismicity, and intraplate shortening and magmatismexpressed hundreds of kilometers from the trench. Yet, the impacts of flat-slabsubduction on hinterland evolution remain poorly understood. We leverage newthermochronological data from the Argentine Frontal Cordillera (a zone of highhinterland topography above the modern flat-slab segment at 29–33ºS) and novelthermal history modeling techniques to interrogate the influence of (1)increased plate coupling, elevated shortening, and structurally-drivenexhumation along emergent or subsurface faults, and/or (2) dynamic upliftassociated with slab flattening and inboard migration of the subduction hinge.New apatite and zircon (U-Th)/He data quantify hinterland cooling duringPaleogene subduction and Neogene flattening of the Nazca oceanic plate. Ourthermal history modeling approach implements a time-elevation extension to the1D HeFTy thermal history modeling program that allows simultaneous inversion ofmultiple samples along a structural or topographic profile. This extensionenables HeFTy to better approximate transient effects such as isothermcompression during rapid exhumation and the transition from geothermal toelevation gradients, and allows for change in the relative depth among samples(e.g., tilting, folding) during the history within user-defined constraints.Multi-sample modeling results from hinterland sample profiles spanning analong-strike distance of >400 km record rapid exhumational cooling coevalwith middle Miocene flattening of the subducted slab, and point tostructurally-driven exhumation: along an orogen-scale fault-bend fold anticlineat 29–31°S, and emergent faults that exhume west-dipping hanging wall panels at~31–33°S. We illustrate the resulting structural, topographic, andthermochronological relationships along two reconstructed 2D geological crosssections using thermokinematic modeling (FETKin software). This researchdemonstrates the utility of multi-sample thermal history modeling in refiningthe results obtained from single-sample modeling approaches, and evaluating thetiming, rates, and drivers of exhumation during changes in subduction.
publishDate 2022
dc.date.none.fl_str_mv 2022
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Reunión
Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/228257
What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software; Geological Society of America Connects Meeting; Estados Unidos; 2022
CONICET Digital
CONICET
url http://hdl.handle.net/11336/228257
identifier_str_mv What were the drivers of hinterland exhumation during flat-slab subduction in the southern Central Andes? Insights from multi-sample thermal history modeling using hefty 2.0 and fetkin software; Geological Society of America Connects Meeting; Estados Unidos; 2022
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://gsa.confex.com/gsa/2022AM/meetingapp.cgi/Paper/381296
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/vnd.openxmlformats-officedocument.wordprocessingml.document
application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv The Geological Society of America
publisher.none.fl_str_mv The Geological Society of America
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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