Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.sedgeo.2012.01.006 |
Sedimentary evolution of the continental Early-Middle Triassic Canizar Formation (Central Spain): Implications for life recovery after the Permian-Triassic crisis | |
Lopez-Gomez, Jose1; Galan-Abellan, Belen1; de la Horra, Raul; Barrenechea, Jose F.2; Arche, Alfredo1; Bourquin, Sylvie3; Marzo, Mariano4; Durand, Marc5 | |
通讯作者 | Lopez-Gomez, Jose |
来源期刊 | SEDIMENTARY GEOLOGY
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ISSN | 0037-0738 |
EISSN | 1879-0968 |
出版年 | 2012 |
卷号 | 249页码:26-44 |
英文摘要 | The Permian-Triassic transition (P-T) was marked by important geochemical perturbations and the largest known life crisis. Consequences of this event, as oxygen-depleted conditions and the unusual behavior of the carbon cycle, were prolonged during the Early Triassic interval delaying the recovery of life in both terrestrial and marine ecosystems. Studies on Lower Triassic sediments of continental origin, as in the case of Western Europe, are especially problematic due to the scarcity of fossils and absence of precise dating. The Canizar Fm. is an Early-Middle Triassic unit of continental origin of the SE Iberian Ranges, E Spain. A detailed sedimentary study of this unit allows a shedding of light on some unresolved problems of the continental deposits of this age. The top of this unit is dated as early Anisian by means of a pollen association, while the age of its base is here estimated as late Smithian or Smithian-Spathian transition. Different fades associations and architectural elements have been defined in this unit. In the western and central parts of the basin, this unit shows sedimentary characteristics of fluvial deposits with locally intercalated aeolian sediments, while in the eastern part there is an alternation of both aeolian and fluvial deposits. Sedimentary structures also indicate changes in the climate conditions, mainly from arid to semiarid. Two marked arid periods when well-preserved aeolian sediments developed during early-middle Spathian and Spathian-Anisian transition. They alternated with two semiarid but more humid periods during the late Spathian and early Anisian. These conditions basically correspond with the general arid and very arid conditions described for central-western European plate during the same period of time. The Ateca-Montalban High, in the northern border of the study basin, must have represented an important topographic barrier in the western Tethys separating aeolian dominated areas to the N and NE from fluvial dominated areas to the south. The Canizar Fm. has been subdivided into six members (A-F) separated by seven (1-7) major bounding surfaces (MBS). These surfaces are well recognized laterally over hundred of km and they represent 10(4)-10(5) My. MBS-5 is considered to be of late Spathian age and it is a clear indication of tectonic activity, represented by a mild unconformity. This event represents a change in the sedimentary characteristics (reactivation) of the unit and from here to the top of the unit are found the first signals of biotic recovery, represented by tetrapod footprints, plants, roots and bioturbation. All of these characteristics and the estimated age represented by the MBS-5 event permit this surface to be related to the coeval Hardegsen unconformity of Central-Western Europe. These first signals of biotic recovery can thus be related to an increased oxygen supply due to the new created paleogeographical corridors in the context of this tectonic activity. These biotic signals occurred 5 My after the Permian-Triassic limit crisis; a similar delay as occurred in other coeval and neighboring basins. (C) 2012 Elsevier B.V. All rights reserved. |
英文关键词 | Triassic Recovery Crisis PTB Climate Smithian Spathian Anisian |
类型 | Article |
语种 | 英语 |
国家 | Spain ; France |
收录类别 | SCI-E |
WOS记录号 | WOS:000301815700003 |
WOS关键词 | SE IBERIAN RANGES ; CARBON-ISOTOPE ; PALEOGEOGRAPHIC SIGNIFICANCE ; SEQUENCE STRATIGRAPHY ; EASTERN SPAIN ; AEOLIAN DUNE ; BOUNDARY ; CLIMATE ; BASIN ; SYSTEM |
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/2XILL650/174996 |
作者单位 | 1.Univ Complutense, Fac Geol, Inst Geociencias CSIC UCM, Dept Estratig, Madrid 28040, Spain; 2.Univ Complutense, Fac Geol, Inst Geociencias CSIC UCM, Dpto Cristalog & Mineral, Madrid 28040, Spain; 3.Univ Rennes 1, UMR 6118, CNRS INSU, F-35042 Rennes, France; 4.Univ Barcelona, Zona Univ Pedralbes, Fac Geol, Dept Estratig Paleontol & Geosci Marines, Barcelona 08028, Spain; 5.Univ Henri Poincare Nancy, UMR GR2 7566, F-545506 Vandoeuvre Les Nancy, France |
推荐引用方式 GB/T 7714 | Lopez-Gomez, Jose,Galan-Abellan, Belen,de la Horra, Raul,et al. Sedimentary evolution of the continental Early-Middle Triassic Canizar Formation (Central Spain): Implications for life recovery after the Permian-Triassic crisis[J],2012,249:26-44. |
APA | Lopez-Gomez, Jose.,Galan-Abellan, Belen.,de la Horra, Raul.,Barrenechea, Jose F..,Arche, Alfredo.,...&Durand, Marc.(2012).Sedimentary evolution of the continental Early-Middle Triassic Canizar Formation (Central Spain): Implications for life recovery after the Permian-Triassic crisis.SEDIMENTARY GEOLOGY,249,26-44. |
MLA | Lopez-Gomez, Jose,et al."Sedimentary evolution of the continental Early-Middle Triassic Canizar Formation (Central Spain): Implications for life recovery after the Permian-Triassic crisis".SEDIMENTARY GEOLOGY 249(2012):26-44. |
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