气候变化领域集成服务门户(CCPortal): Unraveling the timing of the Caviahue depression; Andean Southern Volcanic Zone: insights from the sedimentary infill

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DOI	10.1007/s00531-020-01936-3
	Unraveling the timing of the Caviahue depression; Andean Southern Volcanic Zone: insights from the sedimentary infill
	Hernando I.R.; Bucher J.; del Papa C.E.; Eisermann J.O.; Göllner P.L.; Guzmán S.R.; Balbis C.; Petrinovic I.A.
发表日期	2020
ISSN	14373254
英文摘要	The Caviahue–Copahue volcanic complex in the Southern Volcanic Zone of the Andes is composed of the Pliocene–Pleistocene Caviahue depression and the active Copahue volcano. This volcanic complex is located in a zone of profuse volcanic and tectonic activity, and thus, the origin of the depression includes both tectonic and volcanic hypothesis (e.g., formation of a collapse caldera and a pull-apart basin). According to current knowledge, the oldest rocks filling the depression are lavas and ignimbrites of the Pleistocene Las Mellizas Formation. However, clastic sedimentary deposits underlying this unit have been recognized. Here, we document the characteristics of these deposits at the south shore of the Caviahue lake using field data and digital outcrop models (DOM). We have concluded that the deposits are deltaic and alluvial in origin and made up by a prodelta/distal deltaic front, delta front deposits, delta plain sediments and alluvial deposits. An unconformity separates the deltaic deposits from overlying alluvial deposits, indicating the decrease in the stratigraphic base level probably associated with a sudden coarse-grained clastic input and a drop in the lake level. Our study has implications on the timing and evolution of the Caviahue depression and indicates that the depression precedes the Las Mellizas Formation. Thus, Las Mellizas ignimbrite should not be interpreted as the main unit related to the Caviahue caldera as it has been proposed by some authors. If the depression had indeed been formed by a collapse caldera, this event would be previous to the described sediments. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Alluvial deposits; Caviahue depression; Deltaic deposits; Volcanic activity
语种	英语
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/147757
作者单位	Centro de Investigaciones Geológicas (CIG), CONICET-UNLP, Diagonal 113 No. 275, La Plata, B1904DPK, Argentina; Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), UNC-CONICET, Av. Vélez Sarfield 1611, Córdoba, X5016GCA, Argentina; Institut für Geologie, Universität Hamburg, Bundesstraße 55, Hamburg, 20146, Germany; Instituto de Bio y Geociencias del NOA (IBIGEO), UNSa-CONICET, 9 de Julio 14, Rosario de Lerma, Salta 4405, Argentina
推荐引用方式 GB/T 7714	Hernando I.R.,Bucher J.,del Papa C.E.,et al. Unraveling the timing of the Caviahue depression; Andean Southern Volcanic Zone: insights from the sedimentary infill[J],2020.
APA	Hernando I.R..,Bucher J..,del Papa C.E..,Eisermann J.O..,Göllner P.L..,...&Petrinovic I.A..(2020).Unraveling the timing of the Caviahue depression; Andean Southern Volcanic Zone: insights from the sedimentary infill.International Journal of Earth Sciences.
MLA	Hernando I.R.,et al."Unraveling the timing of the Caviahue depression; Andean Southern Volcanic Zone: insights from the sedimentary infill".International Journal of Earth Sciences (2020).