A case study of paleoenvironmental interactions during the Miocene Climate Optimum in southwestern Paratethys

0556462 - GLÚ 2022 RIV NL eng J - Journal Article
Kopecká, J. - Holcová, K. - Brlek, M. - Scheiner, Filip - Ackerman, Lukáš - Rejšek, Jan - Milovský, R. - Baranyi, V. - Gaynor, S. - Galović, I. - Brčić, V. - Belak, M. - Bakrač, K.
A case study of paleoenvironmental interactions during the Miocene Climate Optimum in southwestern Paratethys.
Global and Planetary Change. Roč. 211, April (2022), č. článku 103784. ISSN 0921-8181. E-ISSN 1872-6364
R&D Projects: GA ČR(CZ) GA20-05872S
Institutional support: RVO:67985831
Keywords : Langhian * Foraminifera * Calcareous nannoplankton * Palynology * Sr-chemostratigraphy * Paleoceanological model
OECD category: Paleontology
Impact factor: 3.9, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0921818122000510

The marine system of the Mediterranean-Paratethys region in the Middle Miocene was influenced by the global climatic changes corresponding to the Miocene Climate Optimum. The latter was characterized by global warming of deep oceanic waters succeeded by a decrease of wind activity and ocean water circulation together with a decline in oceanic productivity. This study provides a detailed paleoenvironmental and depositional history of the Middle Miocene deposits from Mt. Poˇzeˇska Gora (the east part of Croatia). Stable carbon and oxygen isotope data with foraminiferal fauna coupled together with palynological data indicate both seasonal and long-term changes in surface water temperatures, nutrient contents, and salinity. Furthermore, it was possible to determine two phases of Middle Miocene flooding in the studied marine system: (a) a shallow, high nutrient marginal sea strongly affected by freshwater inputs corresponding to the thermal maximum and periods with enhanced precipitation during the Miocene Climate Optimum, and (b) a younger deeper marginal sea with a developed seasonal stratification, rather intermediate nutrient availability and reduced fresh-water inputs. Based on the microbiostratigraphy and strontium isotope stratigraphy (⁸⁷Sr/⁸⁶Sr) coupled with previously published high-precision geochronology, the timing of the first and second flooding can be correlated with the Langhian age - ≤15.4 Ma and 14.6 Ma, respectively Possibly, the properties of the surficial waters that were described as a part of the flooding phases in individual time intervals can indicate changes in circulation patterns as a result of potential influence of the open-sea water masses.
Permanent Link: http://hdl.handle.net/11104/0331214