Arid
DOI10.1016/j.sedgeo.2012.11.008
Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Canadon Asfalto Formation (Jurassic), Patagonia, Argentina
Cabaleri, Nora G.1; Benavente, Cecilia A.2
通讯作者Cabaleri, Nora G.
来源期刊SEDIMENTARY GEOLOGY
ISSN0037-0738
EISSN1879-0968
出版年2013
卷号284页码:91-105
英文摘要

The Las Chacritas Member is the lower part of the Canadon Asfalto Formation (Jurassic). The unit is a completely continental limestone succession with volcanic contributions that were deposited during the development of the Canadon Asfalto Rift Basin (Chubut province, Patagonia, Argentina). A detailed sedimentological analysis was performed in the Fossati depocenter to determine the paleoenvironments that developed in the context of this rift. The Las Chacritas Member represents a carbonate paleolake system with ramp-shaped margins associated with wetlands that were eventually affected by subaerial exposure and pedogenesis. This process is represented by three main subenvironments: a) a lacustrine setting sensu stricto (lacustrine limestone fades association), represented by Mudstones/Wackestones containing porifera spicules (F1), Intraclastic packstones (F6) and Tabular stromatolites (F10) in which deposition and diagenesis were entirely subaqueous; b) a palustrine setting (palustrine limestone facies association) containing Microbial Mudstones (F2), Intraclastic sandy packstone with ostracode remains (F3), Oncolitic packstone (F5), Brecciated limestone (F7) and Nodular-Mottled limestone (F8) representing shallow marginal areas affected by groundwater fluctuations and minor subaerial exposure; and c) a pedogenic paleoenvironment (pedogenic limestone facies association) including Intraclastic limestone (F4) and Packstones containing Microcodium (F9) fades displaying the major features of subaerial exposure, pedogenic diagenesis and the development of paleosols. The fluvial-palustrine-lacustrine succession shows a general shallow upward trend in which contraction-expansion cycles are represented (delimited by exposure and surface erosion). The variations in the successive formations reflect the responses to fluctuations in a combination of two major controls, the tectonic and local climatic variables. The predominance of the palustrine fades associations was determined by its accommodation space as well as the local climate conditions. The variations in the lacustrine limestone facies associations reflect differential patterns of subsidence within the sub-basin. The diagnostic features of the palustrine limestone fades associations (organic matter (OM) content, microinvertebrate fauna, abundant mud cracks, brecciation, presence of evaporitic minerals) frame the sub-basin in a climatic context intermediate between arid and subhumid conditions. (c) 2012 Elsevier B.V. All rights reserved.


英文关键词Carbonate Lacustrine Palustrine Paleoenvironments
类型Article
语种英语
国家Argentina
收录类别SCI-E
WOS记录号WOS:000315554300006
WOS关键词PALUSTRINE CARBONATES ; CHUBUT PROVINCE ; LACUSTRINE ; BASIN ; DEPOSITS ; EVOLUTION ; MIOCENE ; FACIES ; STRATIGRAPHY ; STROMATOLITES
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179917
作者单位1.Univ Buenos Aires, Inst Geocronol & Geol Isotop, Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF, Argentina;
2.Consejo Nacl Invest Cient & Tecn, Ctr Cient Tecnol Mendoza, Inst Argentino Nivol Glaciol & Ciencias Ambiental, RA-5500 Mendoza, Argentina
推荐引用方式
GB/T 7714
Cabaleri, Nora G.,Benavente, Cecilia A.. Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Canadon Asfalto Formation (Jurassic), Patagonia, Argentina[J],2013,284:91-105.
APA Cabaleri, Nora G.,&Benavente, Cecilia A..(2013).Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Canadon Asfalto Formation (Jurassic), Patagonia, Argentina.SEDIMENTARY GEOLOGY,284,91-105.
MLA Cabaleri, Nora G.,et al."Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Canadon Asfalto Formation (Jurassic), Patagonia, Argentina".SEDIMENTARY GEOLOGY 284(2013):91-105.
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