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dc.contributor.author
Do Campo, Margarita Diana  
dc.contributor.author
Bauluz, Blanca  
dc.contributor.author
Nieto, Fernando  
dc.date.available
2023-08-31T16:24:51Z  
dc.date.issued
2022-01  
dc.identifier.citation
Do Campo, Margarita Diana; Bauluz, Blanca; Nieto, Fernando; Widespread hydrothermal alteration overprinting epizonal Ordovician rocks in the Puna region of Argentina (Salta and Jujuy provinces); Elsevier Science; Applied Clay Science; 216; 1-2022; 1-13  
dc.identifier.issn
0169-1317  
dc.identifier.uri
http://hdl.handle.net/11336/210053  
dc.description.abstract
X-ray-diffraction and textural studies under scanning electron microscopy (SEM) using backscattered electron images were employed to outline the thermal post-depositional evolution of Ordovician slates and metavolcanic rocks from four representative localities in southern Puna (the Sierra de Guayaos, the southern zone of the Sierra de Cobres, Cordón de Pozuelos, and Cordón del Gallego) and the Sierra de Cochinoca-Escaya in northern Puna of Argentina. In the case of a meta-andesite that in a previous study had displayed complex clay mineralogy, additional XRD analysis along with a detailed TEM study was performed. Clay mineralogy, Kübler index and chlorite geothermometry indicated that the rocks had undergone prograde metamorphic evolution attaining the epizone. Textural evidence proves that the metamorphic event was syntectonic with the folding that affected this succession, producing a conspicuous slate cleavage in sedimentary and volcanic rocks. Afterwards, the rocks were affected by hydrothermal alteration that produced retrograde changes in mineralogy at centimeter, micron and nanometer scales. The hydrothermal fluid partially dissolved the metamorphic minerals and enhanced the crystallization of clays, kaolinite being the most frequent clay in the altered rocks. Alunite-jarosite was identified in one slate and also evidences of metal transport, suggesting an acid hydrothermal fluid and temperatures between 100 and ~ 300 °C. These data confirm that the Ordovician successions of southern Puna were affected by widespread hydrothermal alteration, as the equivalent rocks in northern Puna. The hydrothermal event was probably associated with the intrusion of the Eastern Puna Magmatic Belt. In the meta-andesite outcropping in the Sierra de Cochinoca-Escaya, HRTEM images and compositional mapping reveal the steps in the paragenetic evolution of the hydrothermal event that produced the alteration of mafic phenocrysts and the formation of intergrowths between high-charge corrensite, trioctahedral vermiculite, and kaolinite.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier Science  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
CHL/VRM MIXED-LAYER  
dc.subject
HYDROTHERMAL ALTERATION  
dc.subject
SOUTHERN PUNA  
dc.subject
VERMICULITE  
dc.subject.classification
Mineralogía  
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
Widespread hydrothermal alteration overprinting epizonal Ordovician rocks in the Puna region of Argentina (Salta and Jujuy provinces)  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2023-07-06T22:44:43Z  
dc.journal.volume
216  
dc.journal.pagination
1-13  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Do Campo, Margarita Diana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotópica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotópica; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina  
dc.description.fil
Fil: Bauluz, Blanca. Universidad de Zaragoza; España  
dc.description.fil
Fil: Nieto, Fernando. Universidad de Granada; España  
dc.journal.title
Applied Clay Science  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0169131721003264  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.clay.2021.106302