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Ratschbacher, Barbara  
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Cawood, Tarryn K.  
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Paterson, Scott Robert  
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Larrovere, Mariano Alexis  
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Lusk, A.  
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Alasino, Pablo Horacio  
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Rick, C.  
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Memeti, V.  
dc.date.available
2023-01-20T14:26:31Z  
dc.date.issued
2020  
dc.identifier.citation
Do intrusive bodies weaken or strengthen the arc crust-or both?: An example from the Famatinian arc, Argentina; 116th Annual Meeting of the Cordilleran Section; Estados Unidos; 2020; 1-1  
dc.identifier.uri
http://hdl.handle.net/11336/185127  
dc.description.abstract
Voluminous magmatism appears to have conflicting effects on the strength of the arc crust into which it is emplaced: the intrusion of large volumes of hot, weak material can weaken the crust and result in broad distributed deformation; on the other hand, the addition of large, competent bodies of plutonic rock appears to strengthen the crust overall, and cause strain to localize into narrow shear zones. We present a case in which both of these processes appear to have occurred, but at different times during protracted cooling of intrusive units. The Cuesta de Randolfo Mylonite Zone (RMZ) is one of numerous km-scale shear zones in the central, S-type granite-dominated belt of the Ordovician Famatinian Arc, Argentina. The RMZ comprises several distinct structural domains characterized by distinctive compositional and deformation features: The ca. 4km wide Western Domain comprises the youngest intrusive unit of two mica, tourmaline-bearing granite with a NW-trending, moderate- to strong, pervasive ductile foliation and steeply-dipping lineations. We propose that the relatively low solidus temperatures of this strongly peraluminous and boron-rich unit caused it to remain above its solidus for an extended amount of time. This, together with the high quartz content, facilitated a continuous transition from distributed melt-present deformation into high-T, quartz-dominated subsolidus deformation, during which strain remained broadly distributed. The Eastern Domain, in contrast, is ca. 5km wide and comprises the oldest intrusive phase of plagioclase and biotite-rich granodiorite with a very weak to absent fabric, but which is cut by highly localized, cm- to m-scale ultramylonitic shear zones. These narrow shear zones trend NW, parallel the overall trend of the RMZ, typically occur along the edges of quartz veins or granitic dykes of the two-mica granite, and are characterized by intense sericitization of magmatic feldspar. Therefore, emplacement of the two mica-granite in the Western Domain created a broad weak zone, which took up strain while the granite cooled from hyper- to subsolidus temperatures. After further cooling, the two mica-granite acted as a strong, competent unit, and strain was preferentially localized into narrow ultramylonites in the adjacent granodiorite, which underwent reaction weakening.  
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application/pdf  
dc.language.iso
eng  
dc.publisher
Geological Society of America  
dc.rights
info:eu-repo/semantics/openAccess  
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https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
DUCTIL DEFORMATION  
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ARC  
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FAMATINIAN  
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ARGENTINA  
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Geología  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Do intrusive bodies weaken or strengthen the arc crust-or both?: An example from the Famatinian arc, Argentina  
dc.type
info:eu-repo/semantics/publishedVersion  
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info:eu-repo/semantics/conferenceObject  
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info:ar-repo/semantics/documento de conferencia  
dc.date.updated
2022-03-17T14:05:24Z  
dc.journal.volume
52  
dc.journal.number
4  
dc.journal.pagination
1-1  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
California  
dc.description.fil
Fil: Ratschbacher, Barbara. University of Southern California; Estados Unidos  
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Fil: Cawood, Tarryn K.. University of Southern California; Estados Unidos  
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Fil: Paterson, Scott Robert. University of Southern California; Estados Unidos  
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Fil: Larrovere, Mariano Alexis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina  
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Fil: Lusk, A.. University of Southern California; Estados Unidos  
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Fil: Alasino, Pablo Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina  
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Fil: Rick, C.. University of Southern California; Estados Unidos  
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Fil: Memeti, V.. California State University; Estados Unidos  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.geosociety.org/GSA/Events/Section_Meetings/GSA/Sections/cd/2020mtg/home.aspx  
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info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1130/abs/2020CD-347580  
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Internacional  
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Reunión  
dc.description.nombreEvento
116th Annual Meeting of the Cordilleran Section  
dc.date.evento
2020-05-12  
dc.description.paisEvento
Estados Unidos  
dc.type.publicacion
Book  
dc.description.institucionOrganizadora
Geological Society of America  
dc.source.libro
116th Annual Meeting of the Cordilleran Section  
dc.date.eventoHasta
2020-05-14  
dc.type
Reunión