Naslov
Palynological evidence of the Carnian Pluvial Episode (CPE) in the western Tethys from marine successions in the Transdanubian Range (TR), western Hungary

Autori
Baranyi, Viktoria, Rostási, Ágnes, Raucsik, Bela, Kürschner, Wolfram M.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstract Book / - , 2018, 153-153

Skup
10th European Palaeobotany-Palynology Conference

Mjesto i datum
Dublin, Irska, 12.08.2018. - 17.08.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Carnian Pluvial Episode, palynology, weathering proxies, Western Tethys, Hungary

Sažetak
The Carnian Pluvial Episode (CPE) represents a shift to more humid climate associated with increased continental runoff, multiple clastic pulses in the generally carbonate-dominated depositional setting of the western Tethys during the late Julian-early Tuvalian accompanied by hygrophyte floral elements. Here, palynological assemblages have been studied from three boreholes, from the Transdanubian Range to reveal climate variations. The palynological record has been compared to clay mineralogy and weathering indices to detect episodes with hygrophyte vegetation and enhanced continental hydrolysis. Palynostratigraphy has been applied to correlate the clastic pulses known from elsewhere in the western Tethys. A total of 55 samples were counted for palynology, a total of 93 terrestrial taxa and 14 different types of aquatic palynomorphs are identified and three local palynomorph assemblages are distinguished in the Julian 2: the lowermost singhii-acutus-vigens, the acutus-vigens- maljawkinae and the uppermost Aratrisporites- astigmosus-densus in the upper part of the late Julian. The quantitative palynological analysis indicates a shift towards hygrophyte elements in the Julian 2, and return to xerophyte associations in the Tuvalian. The increase in the hygrophyte vegetation elements is coincident with elevated kaolinite and partially with higher weathering indices in the early Julian 2 indicating enhanced continental hydrolysis and more humid climate. In the late Julian 2, in a second clastic pulse the high amount of hygrophytes would point to a second humid episode but the clay mineral profile and the weathering indices indicate stronger seasonality and diminished continental weathering. The increase in the spores and pollen which are usually associated with hygrophyte affinity can be also linked to a change in source vegetation due to the northward migration of the TR during the Julian 2, or a sea level lowstand, when the TR shifted to a more proximal position to the coastal areas. Although, the clastic pulses in the western Tethys were related primarily to more humid climate, the comparison to clay mineralogy and weathering proxies suggest a more complicated scenario in the TR. The enhanced continental weathering related to a more humid climate is only suggested for the early stages of the CPE, in the early Julian 2. The clay mineral and palynological records are clearly influenced also by other environmental parameters e.g., sea level changes, current or basin topography.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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