Paleoceanographic and paleoclimatic context of Early Triassic time

Woods, Adam D.

doi:10.1016/j.crpv.2005.07.003

Cited by 43 publications

(16 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Late Paleozoic-Late Triassic construction and dismemberment of Pangea and the possible associated volcanism are thought to have profoundly altered atmospheric circulation over tropical regions (e.g. Tabor and Montafiez, 2002;Woods, 2005;Galfetti et al, 2007a). These changes led to general and local paleogeographical modifications as climate shifts and consequent changes in weathering intensity which modified the general atmospheric CO2 balance (Martin and Macdougall, 1995;Retallack, 1999;Payne et al, 2004;Royer et al, 2004;Hartmann et al, 2009).…”

Section: Benicassim Sectionmentioning

confidence: 99%

“…indicate howev er the occurrence of an important development of fluvial processes in the SE Iberian Basin intertingering eastwards with areas where aeolian processes were dominant during late Smithian-Spathian times. Warmer and moister conditions were probably occurred southwards of the study area, toward the high Southern Hemisphere latitudes (Woods, 2005). It appears that the SE Iberian Basin was a transition zone between those of general arid conditions to the N and warmer and those of moister conditions to the S. In this context, the Ateca Montalban High, located at the northern border of this basin, probably acted as a paleogeographical barrier separating drier conditions to the N from other wetter ones to the S (Figs.…”

Section: Paleogeography and Climate Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Sedimentary evolution of the continental Early–Middle Triassic Cañizar Formation (Central Spain): Implications for life recovery after the Permian–Triassic crisis

López-Gómez

Galán-Abellán

Horra

et al. 2012

Sedimentary Geology

View full text Add to dashboard Cite

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 ter restrial 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 The Cafiizar 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 esti mated age represented by the MBS-5 event permit this surface to be related to the coeval Hardegsen un conformity 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 oc curred in other coeval and neigh boring basins.

show abstract

Section: Benicassim Sectionmentioning

confidence: 99%

Section: Paleogeography and Climate Conditionsmentioning

confidence: 99%

Sedimentary evolution of the continental Early–Middle Triassic Cañizar Formation (Central Spain): Implications for life recovery after the Permian–Triassic crisis

López-Gómez

Galán-Abellán

Horra

et al. 2012

Sedimentary Geology

View full text Add to dashboard Cite

show abstract

“…This began in end-Permian times, when a major rise in global temperature (Royer 2006), acid rain, oceanic transgression (Hallam and Wignall 1997), marine anoxic events (Wignall and Twitchett 2002;Woods 2005), and a higher aridity in continental environments (Smith and Botha 2005) combined to produce the most significant biotic crisis in Earth history at the Permian-Triassic boundary (PTB). Conditions adverse to life continued with several further events (Payne et al 2004) that delayed biotic recovery through the Early Triassic (Kozur 1998;Fraiser and Bottjer 2007).…”

Section: Introductionmentioning

confidence: 99%

Sources of Sr and S In Aluminum-Phosphate-Sulfate Minerals In Early-Middle Triassic Sandstones (Iberian Ranges, Spain) and Paleoenvironmental Implications for the West Tethys

Galán-Abellán¹,

Alonso-Azcárate²,

Newton³

et al. 2013

Journal of Sedimentary Research

View full text Add to dashboard Cite

Aluminum-phosphate-sulfate (APS) minerals, formed during early diagenesis in relation to acid meteoric waters, are the main host of Sr and S in the Early-Middle Triassic continental sandstones of the Iberian Ranges (east of the Iberian Peninsula). The sources of these elements and the effects of paleoenvironmetal changes on these sources and on the formation of APS minerals during Early-Middle Triassic times, were established on the basis of Sr and S isotopic analyses.The S and Sr data (d 34 S V-CDT = +11 to +14% and 87 Sr/ 86 Sr = 0.7099-0.7247, respectively) can be interpreted as resulting from mixing of different sources. Strontium was sourced from the dissolution of pre-existing minerals like K-feldspar and clay minerals inherited from the source areas, causing high radiogenic values. However, the isotopic signal must also be influenced by other sources, such as marine or volcanic aerosol that decreased the total 87 Sr/ 86 Sr ratios. Marine and volcanic aerosols were also sources of sulfur, but the d 34 S was lowered by dissolution of pre-existing sulfides, mainly pyrite. Pyrite dissolution and volcanic aerosols would also trigger the acid conditions required for the precipitation of APS minerals.APS minerals in the study area are found mainly in the Cañizar Formation (Olenekian?-Aegian), which has the lowest 87 Sr/ 86 Sr ratios. The lower abundance of APS minerals in the Eslida Formation (Aegian-Pelsonian) may indicate change in the acidity of pore water towards more alkaline conditions, while the increased 87 Sr/ 86 Sr ratios imply decreased Sr input from volcanic activity and/or marine aerosol inputs during Anisian times. Therefore, the decrease in abundance of APS minerals from the Early to Middle Triassic and the variations in the sources of Sr and S are indicative of changes in paleoenvironmental conditions during the beginning of the Triassic Period.These changes from acid to more alkaline conditions are also coincident with the first appearance of carbonate paleosols, trace fossils, and plant fossils in the upper part of the Cañizar Formation (and more in the overlying Eslida Formation) and mark the beginning of biotic recovery in this area. The presence of APS minerals in other European basins of the Western Tethys (such as the German Basin, the Paris Basin and the southeastern France and Sardinia basins) could thus also indicate that unfavorable environmental conditions caused delay in biotic recovery in those areas. In general, the presence of APS minerals may be used as an indicator of arid, acidic conditions unfavorable to biotic colonization.

show abstract

“…Warm temperate climates extended to the poles. Sea levels were low and the seas had little or no dissolved oxygen and were possibly alkaline (Woods, 2005). Rapid global warming at the very end of the Permian expanded the deserts and created a "super-hothouse" world, that may have contributed to or exacerbated the great Permian-Triassic extinction.…”

Section: Palaeoecology Of the Triassic Larger Foraminiferamentioning

confidence: 99%

Evolution and Geological Significance of Larger Benthic Foraminifera

2018

View full text Add to dashboard Cite

Paleoceanographic and paleoclimatic context of Early Triassic time

Cited by 43 publications

References 84 publications

Sedimentary evolution of the continental Early–Middle Triassic Cañizar Formation (Central Spain): Implications for life recovery after the Permian–Triassic crisis

Sedimentary evolution of the continental Early–Middle Triassic Cañizar Formation (Central Spain): Implications for life recovery after the Permian–Triassic crisis

Sources of Sr and S In Aluminum-Phosphate-Sulfate Minerals In Early-Middle Triassic Sandstones (Iberian Ranges, Spain) and Paleoenvironmental Implications for the West Tethys

Evolution and Geological Significance of Larger Benthic Foraminifera

Contact Info

Product

Resources

About