Geology of the area of Embalse Las Maderas, Jujuy Province, with a note on the Tremadocian-Floian bioclastic-phosphatic accumulations

The geology of the embalse Las Maderas area, Jujuy Province in the Cordillera Oriental (Eastern Andean Cordillera) of Argentina is described. The exposed succession corresponds to the metamorphic basement of northwestern Argentina (Puncoviscana Complex) and the marine sedimentary rocks of the lower...

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Detalles Bibliográficos
Autores principales: Duperron, M., Scasso, R.A., Moya, M.C.
Formato: JOUR
Materias:
Linguliform brachiopods
Lower Ordovician
Marine sediments
Northwestern Argentina
Phosphate
bioclastic rock
brachiopod
concentration (composition)
fossil assemblage
intermontane basin
marine sediment
phosphogenesis
sedimentary rock
sedimentary structure
structural geology
Tremadocian
trilobite
Argentina
Cordillera Oriental [Argentina]
Jujuy
Brachiopoda
Trilobitomorpha
victoria group
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v75_n1_p95_Duperron
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:The geology of the embalse Las Maderas area, Jujuy Province in the Cordillera Oriental (Eastern Andean Cordillera) of Argentina is described. The exposed succession corresponds to the metamorphic basement of northwestern Argentina (Puncoviscana Complex) and the marine sedimentary rocks of the lower Paleozoic (Mesón and Santa Victoria Groups), cropping out in the hills around the reservoir. Cenozoic synorogenic conglomerates of the Piquete Formation (Jujuy Group) and The La Troja Formation are located in the intermontane lowlands. The structure is characterized by overturned folds associated with thrusts developed on the low-grade metasedimentary rocks of the basement, consistent with a thick-skin structural style, with East vergent fault flexured folds cut by parallel oriented faults. Phosphatic rocks of the Santa Victoria Group were studied in detail. Their origin is associated to the sedimentary reworking of biogenic particles and it is not constrained to a phosphogenic interval sensu stricto. Beds with high phosphate content and high concentration of linguliform bioclasts of the Floresta Formation were classified as phosbio-grainstones and phosbio-rudstones. Other beds with lower phosphate content in the Áspero and San Bernardo Formations incorporated a significant proportion of rhynchonelliform brachiopods and trilobites together with the linguliform brachiopods, and were classified as biophosbio-rudstones. © 2018, Taylor and Francis Ltd. All rights reserved.

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