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AAPG Bulletin, Preliminary version published online Ahead of Print 15 September 2022.

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Sedimentary evolution of a Late Triassic salt giant and a synchronous carbonate unit between the Peruvian Andean Cordillera and the Brazilian Amazonian Foreland

Emilio Carrillo1 , Roberto Barragán2 , Christian Hurtado3 , Ysabel Calderón4 , Germán Martín1 , Elizabeth Mariño1 , Luis Sarmiento1 , Ariana Rivera1 , Yaniel Misael Vázquez-Taset1 , Lluís Fontboté5 , and Silvia Rosas6

1 School of Earth Sciences, Energy and Environment, Yachay Tech University, Hacienda San José s/n, 100115, San Miguel de Urcuquí, Ecuador
2 BOTOGEO Exploration Consultant, Hacienda Boto, Patate, Ecuador
3 Universidad Nacional de San Marcos, Av. Venezuela Cda. 34 s/n Lima-Cercado, Lima, Peru
4 PERUPETRO S.A., Av. Luis Aldana 380, San Borja, Lima, Peru
5 Department of Earth Sciences, University of Geneva, CH 1205 Geneva, Switzerland
6 Geological Engineering Program, Pontifical Catholic University of Peru, Av. Universitaria 1801, Lima, Peru

Ahead of Print Abstract

Salt giants with mixed evaporites/carbonates are sedimentary systems poorly understood in terms of sequence stratigraphy, tectonic control and related natural resources. In order to improve the knowledge of these systems, a sedimentology study of a Late Triassic salt giant between the Subandean Fold-and-thrust belt (SFTB) of Peru and the Brazilian Amazonian Foreland (AF) was performed on the pre- to post-salt deposits using field observations, thin-section descriptions and well-log analysis. In addition, this study was compared with sedimentary observations of Late Triassic carbonate successions from the Subandean-Cordillera Transition zone (SCTZ) documented in previous works. This resulted in the following sedimentary events associated to a relative sea-level fluctuation: first transgression; regression; and second transgression. In the SFTB and AF, during the first transgression, continental/transitional siliciclastic environments with sporadic marine incursions allowing the development of salt ponds were formed first. Subsequently, a salt basin surrounded by a mudflat was established. At the end of the first transgression, carbonate deposits dominated. During the subsequent regression, a sulphate platform was established followed by a salt basin enveloped by mudflats and exposed areas. This regression terminated with the development of a central mudflat and an increase of the exposed areas. In the second transgression, carbonates and an eastward mudflat with gypsum ponds dominated the sedimentation. In the SCTZ, external platform to deep basin carbonates dominated the sedimentation during the three events. Based on this evolution, eustatic oscillations of the global oceanic level and structural features published in previous works, it is interpreted that the deposition of the studied salt giant and external carbonates were controlled by thermal sagging and eustatic sea-level oscillations. The available data suggest the existence of a westward migration of the subsidence that may be caused by slab steepening. Hydrocarbon reservoirs and stratabound sediment-hosted Cu-Ag and Zn-Pb ore deposits and occurrences are also partly controlled by the evolution of the mixed evaporites/carbonates sedimentary system in the region between the Subandean-Cordillera Transition zone and the Amazonian Foreland.

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Please cite this AAPG Bulletin Ahead of Print article as:

Emilio Carrillo , Roberto Barragán , Christian Hurtado , Ysabel Calderón , Germán Martín , Elizabeth Mariño , Luis Sarmiento , Ariana Rivera , Yaniel Misael Vázquez-Taset , Lluís Fontboté , Silvia Rosas: Sedimentary evolution of a Late Triassic salt giant and a synchronous carbonate unit between the Peruvian Andean Cordillera and the Brazilian Amazonian Foreland, (in press; preliminary version published online Ahead of Print 15 September 2022: AAPG Bulletin, DOI:10.1306/08072221104.