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DOI | 10.1016/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
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ISSN | 0037-0738 |
EISSN | 1879-0968 |
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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