Calcimicrobial cap rocks from the basal Triassic units: western Taurus occurrences (SW Turkey)
- 31 October 2005
- journal article
- Published by Cellule MathDoc/CEDRAM in Comptes Rendus Palevol
- Vol. 4 (6-7), 569-582
- https://doi.org/10.1016/j.crpv.2005.03.001
Abstract
A post-extinction calcimicrobial cap rock occurs above the giant Permian skeletal carbonate platform exposed in the western Taurus Mountains (southern Turkey). It was formed during the main step of a very rapid and large-scale platform flooding (Earliest Triassic) and has been found also in other Tethyan localities. This calcimicrobial cap rock, 20 to 40 m thick, consists of thrombolitic and stromatolitic build-ups at the base and most oolitic grainstone in the upper part. It was terminated by a sudden input of fine terrigenous sediments. The domal, columnar and conical stromatolites are ‘anachronistic’ deposits as are the abundant botryoidal and fanning aragonite crystal pseudomorphs. This again shows the uniqueness of the Earliest Triassic period and indicates a delayed biotic recovery. To cite this article: A. Baud et al., C. R. Palevol 4 (2005). Un chapeau calcimicrobien dans les unités basales du Trias : occurrences dans le Taurus occidental (Turquie du Sud-Ouest). Un chapeau calcimicrobien post-extinction recouvre la plate-forme carbonatée permienne affleurant dans le Taurus occidental (Turquie méridionale) ; il a été reconnu dans d'autres régions téthysiennes. La croissance de ce chapeau s'effectue durant la phase d'inondation principale du Trias basal. D'une épaisseur de 20 à 40 m, ce chapeau est constitué d'une interdigitation de constructions thrombolitiques et de stromatolites, en sa partie inférieure, et principalement de calcarénites oolitiques, au-dessus. Il se termine abruptement avec l'arrivée d'un détritisme terrigène fin. Avec des constructions thrombolitiques et de stromatolites variés ainsi que des ciments aragonitiques abondants, ce dépôt microbien est considéré comme anachronique. Cet apparent retour dans le passé de la sédimentation biogénique montre une des particularités singulières de la période du Trias précoce. Elle est ici le signe d'une radiation retardée. Pour citer cet article : A. Baud et al., C. R. Palevol 4 (2005).Keywords
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