The Schilfsandstein and its flora–arguments for a humid mid-Carnian episode?

Published on 2018-07-30T21:40:14Z (GMT) by
Recently intensified research on the mid-Carnian episode stimulated discussions about the mid-Carnian climate and a supposed humid climate shift. This basin-scale study on the Schilfsandstein, the type-example of the mid-Carnian episode, applied sedimentological, palynological and palaeobotanical proxies of the palaeoclimate to a large data set of cored wells and outcrops. The results demonstrate the primary control of circum-Tethyan eustatic cycles on the Central European Basin (CEB) where transgressions contributed to basin-scale facies shifts. The palaeoclimate proxies point to a uniform arid to semi-arid Carnian climate with low chemical weathering and high evaporation. Consequently, transgressions into the CEB led to increased evaporation forcing the hydrological cycle. The increased runoff from source areas resulted in high ground water stages at lowlands characterised by hydromorphic palaeosols and intrazonal vegetation with hygrophytic elements. During lowstands, reduced evaporation and runoff led to increased drainage and desiccation of lowlands characterised by formation of vertisols, calcisols and gypsisols and zonal vegetation with xerophytic elements. The herein proposed model of sea-level control on the hydrological cycle integrates co- and subsequent occurrences of wet and dry lowlands, hydromorphic and well drained palaeosols, and intrazonal and zonal vegetations. Thus, the Schilfsandstein does not provide arguments for a humid mid-Carnian episode.

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Franz, M.; Kustatscher, E.; Heunisch, C.; Niegel, S.; Röhling, H.-G. (2018): The Schilfsandstein and its flora–arguments for a humid mid-Carnian episode?. Geological Society of London. Collection.