干旱区生态环境知识资源中心(Arid): Stratigraphical, sedimentological and palaeofloristic characterization of the Sorocayense Group (Triassic) in Barreal depocenter, San Juan Province, Argentina

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DOI	10.5027/andgeoV46n3-3127
	Stratigraphical, sedimentological and palaeofloristic characterization of the Sorocayense Group (Triassic) in Barreal depocenter, San Juan Province, Argentina
	Bodnar, Josefina; Iglesias, Ari; Colombi, Carina E.; Martin Drovandi, Juan
通讯作者	Bodnar, J (corresponding author), Univ Nacl La Plata, Div Paleobot, Fac Ciencias Nat & Museo, Paseo Bosque S-N,B1900FWA, La Plata, Buenos Aires, Argentina.
来源期刊	ANDEAN GEOLOGY
ISSN	0718-7106
出版年	2019
卷号	46 期号:3 页码:567-603
英文摘要	The northern area of Cuyo Basin (west-central Argentina) corresponds to the Rincon Blanco half-graben, whose filling is arranged into the Rincon Blanco and Sorocayense groups. In the present study, we propose a new stratigraphic scheme for the Sorocayense Group in the Barreal depocenter (San Juan Province), revise the palaeoenvironmental interpretations, and organize and analyse the plant assemblages of previous and new fossiliferous levels. We defined three tectosedimentary sequences. The basal sequence represents the initial graben filling with pyroclastic flows, alluvial fan, and ephemeral fluvial systems, and is arranged in a new unit, the Cerro Colorado del Cementerio Formation. The middle sequence, including Barreal and Cortaderita formations, is characterized by sediment gravity flow deposits and different fluvial systems, with development of floodplains with vertisols and calcisols, and temporal ponds/lakes. In turn, the Cortaderita Formation was divided into the following lithostratigraphic members: Don Raul and La Emilia. The upper sequence, represented by Cepeda Formation, was deposited by distributary fluvial and ephemeral fluvial systems. Twelve fossiliferous strata (EF) were recognized, which were all identified in the middle sequence: EF1 to EF3 in the Barreal Formation, EF4 to EF8 in the Don Raul Member, and EF9 to EF12 in the La Emilia Member, both of Cortaderita Formation. The taphocoenosis found in the Barreal and Cortaderita formations were dominated by corystosperms, with conifers, cycadales, and peltasperms as subordinate forms. The available evidence from the taphofloras, palaeosols and palaeonvironments indicate the development of seasonal subtropical climates, which vary from arid or semi-arid in the basal sequence, sub-humid to semi-arid in the middle sequence, and arid or semi-arid in the upper sequence. On the basis of the new information, geological correlation and age of the lithostratigraphic units were accurately re-evaluated. Based on the palaeofloristic content and the correlation with the Rincon Blanco Group, it is possible to infer that the basal sequence was accumulated during late Early Triassic-early Middle Triassic, the middle sequence during the Middle Triassic, while the upper sequence was deposited in the early Late Triassic.
英文关键词	Triassic Cuyo Basin Southwest Gondwana Barreal-Calingasta depocenter Palaeofloras
类型	Article
语种	英语
开放获取类型	gold, Green Published, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000492392100006
WOS关键词	SOUTHERN SOUTH-AMERICA ; DIPTERIDACEAE ; HAUSMANNIA ; FLORAS ; PLANTS ; BASIN
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/2XILL650/369575
作者单位	[Bodnar, Josefina] Univ Nacl La Plata, Div Paleobot, Fac Ciencias Nat & Museo, Paseo Bosque S-N,B1900FWA, La Plata, Buenos Aires, Argentina; [Bodnar, Josefina; Iglesias, Ari; Colombi, Carina E.; Martin Drovandi, Juan] Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF, Argentina; [Iglesias, Ari] Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBION, Quintral 1250,R8400FRF, RA-1250 San Carlos De Bariloche, Rio Negro, Argentina; [Colombi, Carina E.; Martin Drovandi, Juan] Univ Nacl San Juan, Inst & Museo Ciencias Nat, Av Espana 400 Norte,J5400DNQ, San Juan, San Juan, Argentina
推荐引用方式 GB/T 7714	Bodnar, Josefina,Iglesias, Ari,Colombi, Carina E.,et al. Stratigraphical, sedimentological and palaeofloristic characterization of the Sorocayense Group (Triassic) in Barreal depocenter, San Juan Province, Argentina[J],2019,46(3):567-603.
APA	Bodnar, Josefina,Iglesias, Ari,Colombi, Carina E.,&Martin Drovandi, Juan.(2019).Stratigraphical, sedimentological and palaeofloristic characterization of the Sorocayense Group (Triassic) in Barreal depocenter, San Juan Province, Argentina.ANDEAN GEOLOGY,46(3),567-603.
MLA	Bodnar, Josefina,et al."Stratigraphical, sedimentological and palaeofloristic characterization of the Sorocayense Group (Triassic) in Barreal depocenter, San Juan Province, Argentina".ANDEAN GEOLOGY 46.3(2019):567-603.