气候变化领域集成服务门户(CCPortal): Tectonosedimentary evolution of the Coastal Cordillera and Central Depression of south-Central Chile (36°30′-42°S)

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DOI	10.1016/j.earscirev.2020.103465
	Tectonosedimentary evolution of the Coastal Cordillera and Central Depression of south-Central Chile (36°30′-42°S)
	Encinas A.; Sagripanti L.; Rodríguez M.P.; Orts D.; Anavalón A.; Giroux P.; Otero J.; Echaurren A.; Zambrano P.; Valencia V.
发表日期	2021
ISSN	00128252
卷号	213
英文摘要	The forearc of south-central Chile (36°30′-42°S) is characterized by the presence of a Coastal Cordillera and a low lying area known as the Central Depression. The origin of these morphostructural units has been largely debated. They have been ascribed to different ages between the Cretaceous and the Pliocene, and tectonic causes that involve extensional or contractional deformation and have been related to Andean evolution or accretionary processes in the forearc. To investigate the geologic evolution of the Coastal Cordillera and Central Depression in the cited area, we based on stratigraphy, sedimentology, geochronology (U[sbnd]Pb, LA-ICP-MS), structural geology, and geomorphology. Our studies, which are based on our own data and a thorough bibliographic review, indicate the following sequence of events in the tectono-sedimentary evolution of the forearc of south-central Chile during the late Cenozoic. The area was subjected to extensional tectonics caused by slab rollback during the Oligocene-early Miocene, resulting in the genesis of a series of basins filled with volcanic, continental, and marine deposits that extended from the present Chilean coast to the retroac. The extensional basins were tectonically inverted during the late Early-Late Miocene, and most of the forearc became a positive relief that was subjected to fluvial erosion. The West Andean Thrust, a major reverse west verging fault in the limit between the Central Depression and the Andean Cordillera, caused significant uplift of the western flank of the Andes. This triggered flexural subsidence and the accumulation of coarse-grained deposits in the forearc during the Pliocene-Pleistocene. The sudden increase of sediment flux to the trench during this period caused a change from non-accretion or subduction erosion to accretion in the margin of south-central Chile. Progressive growth of the accretionary wedge gave birth to a forearc high, the Coastal Cordillera, which was uplifted in the last 2 Ma. Some forearc areas placed above subducted oceanic fracture zones did not experience uplift during this period due to the significant transport of fluid that inhibited the deformation of the accretionary wedge. Our studies show that the late Cenozoic tectono-sedimentary evolution of the forearc in the study area is complex and involves different processes related to Andean evolution in the first stage and accretionary processes acting exclusively in the forearc in a second stage. The Coastal Cordillera and the Central Depression of south-central Chile were developed in the last 2 Ma and are much younger than classically considered. © 2020 Elsevier B.V.
关键词	Central Depression Coastal Cordillera Forearc South-central Chile West Andean Thrust
英文关键词	accretion; Cretaceous-Paleogene boundary; forearc basin; geomorphological response; morphostructure; sedimentary structure; structural geology; tectonic evolution; tectonic setting; thrust; uplift; Chile; Coastal Cordillera
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/204015
作者单位	Universidad de Concepción, Facultad de Ciencias Químicas, Departamento de Ciencias de la Tierra, Concepción, Chile; Universidad de Buenos Aires, CONICET, Instituto de Estudios Andinos "Don Pablo Groeber"-Facultad de Ciencias Exactas y Naturales, Departamento de Geología, Buenos Aires, Argentina; Universidad de Atacama, Departamento de Geología, Copiapó, Chile; Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, General RocaRío Negro, Argentina; Instituto de Investigación en Paleobiología y Geología (IIPG), CONICET, Av. J. A. Roca 1242, General Roca, Río Negro 8332, Argentina; Universidad Austral de Chile, Instituto de Ciencias de la Tierra, Valdivia, Chile; Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), Centro Científico Tecnológico CONICET, Mendoza, Argentina; Universidad Andres Bello, Facultad de Ingeniería, Geología, Autopista Talcahuano, Concepción, 7100, Chile; Washington State University, School of the Environment, Pullman, Uni...
推荐引用方式 GB/T 7714	Encinas A.,Sagripanti L.,Rodríguez M.P.,等. Tectonosedimentary evolution of the Coastal Cordillera and Central Depression of south-Central Chile (36°30′-42°S)[J],2021,213.
APA	Encinas A..,Sagripanti L..,Rodríguez M.P..,Orts D..,Anavalón A..,...&Valencia V..(2021).Tectonosedimentary evolution of the Coastal Cordillera and Central Depression of south-Central Chile (36°30′-42°S).Earth Science Reviews,213.
MLA	Encinas A.,et al."Tectonosedimentary evolution of the Coastal Cordillera and Central Depression of south-Central Chile (36°30′-42°S)".Earth Science Reviews 213(2021).