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Middle Eocene deformation and sedimentation in the Puna-Eastern Cordillera transition (23 degrees -26 degrees S); control by preexisting heterogeneities on the pattern of initial Andean shortening

F. Hongn, C. del Papa, J. Powell, I. Petrinovic, R. Mon and V. Deraco
Middle Eocene deformation and sedimentation in the Puna-Eastern Cordillera transition (23 degrees -26 degrees S); control by preexisting heterogeneities on the pattern of initial Andean shortening
Geology (Boulder) (March 2007) 35 (3): 271-274

Abstract

The Quebrada de los Colorados Formation, at the north end of Calchaqui Valley in Salta Province, northwest Argentina, preserves evidence of syndepositional deformation since the middle Eocene (ca. 40 Ma) that includes (1) an angular unconformity with the underlying Salta Group (Paleogene), and (2) internal unconformities and changes in vertical facies succession and provenance. Its fossil record [mammalian (notoungulates), middle Eocene] is correlatable to the Casa Grande Formation, which also unconformably overlies the Salta Group; both units record middle Eocene deformation along the eastern border of the Puna Plateau and outline previous first-order mechanical heterogeneities related to the Cretaceous rift basin border. Along the western margin of the Puna, Eocene deformation coincides with thermal (magmatic arc) and mechanical (basin inversion) heterogeneities. Thus, the distribution of Eocene deformation followed an irregular pattern as a consequence of the heritage of preexisting heterogeneities.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 35
Serial Issue: 3
Title: Middle Eocene deformation and sedimentation in the Puna-Eastern Cordillera transition (23 degrees -26 degrees S); control by preexisting heterogeneities on the pattern of initial Andean shortening
Affiliation: Universidad Nacional de Salta, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Buenos Aires 177, 4400 Salta, Argentina, Salta, Argentina
Pages: 271-274
Published: 200703
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2007-029096
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2007058
Illustration Description: illus. incl. geol. sketch map
S25°00'00" - S24°00'00", W66°15'00" - W66°00'00"
Secondary Affiliation: Universidad Nacional de Tucuman, ARG, Argentina
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: 200716
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