气候变化领域集成服务门户(CCPortal): Tectonic controls on late Cambrian-Early Ordovician deposition in Cordillera oriental (Northwest Argentina)

CCPortal

DOI	10.1007/s00531-020-01879-9
	Tectonic controls on late Cambrian-Early Ordovician deposition in Cordillera oriental (Northwest Argentina)
	Vaucher R.; Vaccari N.E.; Balseiro D.; Muñoz D.F.; Dillinger A.; Waisfeld B.G.; Buatois L.A.
发表日期	2020
ISSN	14373254
起始页码	1897
结束页码	1920
卷号	109 期号:6
英文摘要	The western Gondwana margin underwent a complex geodynamic history during the early Paleozoic, and major uncertainties remain as to the role of tectonism in sedimentary dynamics. This study focuses on the lower part Santa Rosita Formation and the coeval Guayoc Chico Group (Cordillera Oriental; Northwest Argentina), ranging from the late Cambrian (Furongian; Age 10) to Early Ordovician (early Tremadocian; Tr1). This stratigraphic interval has been previously interpreted as deposited in an extensional basin to a retro-arc basin without major regional tectonic-induced deformation during its deposition, only recording long-term relative sea-level fluctuations. Four areas (Sierra de Cajas, Angosto del Moreno, Quebrada de Trancas, and Quebrada de Moya) were chosen because they host the most complete and temporally well-constrained stratigraphic sections of the Cordillera Oriental. Throughout the stratigraphic sections, four main facies zones are described and attributed to deposition in estuarine, foreshore-shoreface, delta-front, and offshore environments. Trilobite biozones are used as the biostratigraphic framework. By integrating sedimentary facies analysis, biostratigraphy, and sequence stratigraphy from the four selected sections, a new scenario showcasing the evolution of the basin is proposed. This scenario interprets a tectonically induced deformation during the deposition of the Santa Rosita Formation and the coeval Guayoc Chico Group. The newly acquired sedimentological data show that physiographical changes took place during the Cambrian-Ordovician transition and are expressed in various localities. This major change is recorded in the stratigraphic architecture, where extensive wave-ravinement surfaces and sedimentary hiatus are the result of local, syn-depositional basement uplifts. The initiation of the Puna-Famatinian volcanic arc during the Early Ordovician on the western margin was likely responsible for deformation in the retro-arc basin and the proposed scenario is consistent with the stratigraphic evolution in other areas of the Cordillera Oriental (e.g., Sierra de Mojotoro) and the Sierra de Famatina. Therefore, this study helps to constrain the evolution of the western Gondwana margin during the early Paleozoic, showing changes in the stratigraphic architecture and basin evolution from an extensional to a retro-arc style. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Basin evolution; Guayoc chico group; Retro-arc basin; Santa rosita formation; Shallow-marine
语种	英语
scopus关键词	backarc basin; basin evolution; Cambrian; deposition; Gondwana; Ordovician; sequence stratigraphy; tectonic setting; Argentina; Cordillera Oriental [Argentina]; Rosita
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147646
作者单位	Facultad de Ciencias Exactas, Universidad Nacional de Córdoba, Físicas y Naturales. Av. Vélez Sársfield 299, Córdoba, X5000JJC, Argentina; Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Centro de Investigaciones en Ciencias de la Tierra, (CICTERRA), Ciudad Universitaria, Av. Vélez Sársfield 1611, Edificio CICTERRA, Córdoba, X5016CGA, Argentina; Applied Research in Ichnology and Sedimentology (ARISE) Group, Department of Earth Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada; Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, SK, Canada
推荐引用方式 GB/T 7714	Vaucher R.,Vaccari N.E.,Balseiro D.,et al. Tectonic controls on late Cambrian-Early Ordovician deposition in Cordillera oriental (Northwest Argentina)[J],2020,109(6).
APA	Vaucher R..,Vaccari N.E..,Balseiro D..,Muñoz D.F..,Dillinger A..,...&Buatois L.A..(2020).Tectonic controls on late Cambrian-Early Ordovician deposition in Cordillera oriental (Northwest Argentina).International Journal of Earth Sciences,109(6).
MLA	Vaucher R.,et al."Tectonic controls on late Cambrian-Early Ordovician deposition in Cordillera oriental (Northwest Argentina)".International Journal of Earth Sciences 109.6(2020).