In the North-East of the Moldavian Platform, the upper Badenian is composed of three lithologic units, on top of which there is Limestones and Marls with Lithothamnium Formation. At the level of this formation, the ge...In the North-East of the Moldavian Platform, the upper Badenian is composed of three lithologic units, on top of which there is Limestones and Marls with Lithothamnium Formation. At the level of this formation, the geological research conducted in four localities near the Prut Valley demonstrated, based on two new foraminifera genera identified in this area--Oolina and Velapertina-favorable conditions for the development of the stenohaline fauna, a marine shelf environment with warm water, as well as the certitude regarding the age of the late Badenian for these. These results were not previously reported in this area.展开更多
Studies on Middle Miocene Badenian gypsum in various parts of Central Paratethys,the oldest widespread primary marine gypsum,in western Ukraine,southern Poland and Moravia (Czech Republic) indicate that there are thre...Studies on Middle Miocene Badenian gypsum in various parts of Central Paratethys,the oldest widespread primary marine gypsum,in western Ukraine,southern Poland and Moravia (Czech Republic) indicate that there are three principal gypsum facies:crystalline gypsum,stromatolitic gypsum and clastic gypsum.The latter typically occurs between crystalline and stromatolitic gypsum and between stromatolitic gypsum and the land.In addition,it is common in channels within gypsum microbialites,and is the main facies during the deposition of the upper part of Badenian gypsum when important bathymetric differences existed within the marginal part of the Carpathian Foredeep Basin,the largest foredeep basin in Europe.Within crystalline gypsum facies,it is observed the overall size of the crystals increases and that the layering declines towards the permanent,stabilized brine body,and thus the giant gypsum intergrowths-non-layered coarse-crystalline selenite is the end-member of gypsum facies continuum.Typically it passes into layered selenites although owing to fluctuations of pycnocline level,some transitional gypsum subfacies may be missing both in the vertical section as well as in particular outcrops.The following important controls on the development of gypsum facies have been identified:pycnocline level fluctuations,brine level fluctuations including brine sheets and floods,rare marine transgressions,pedogenesis leading to "alabastrine" gypsum development,and rate of inflow of continental water.展开更多
The middle Miocene Badenian evaporite basin of the Carpathian Foredeep Basin was a saline lake, separated by a barrier from the sea and supplied with seawater seeping through the barrier or overflowing it occasionally...The middle Miocene Badenian evaporite basin of the Carpathian Foredeep Basin was a saline lake, separated by a barrier from the sea and supplied with seawater seeping through the barrier or overflowing it occasionally in the form of short-lived marine transgressions. Such transgressions could leave behind marine microfossils in marly clay intercalations. One of them(2.3 m thick) occurs in the uppermost part of the sulphate sequence, in the unit ‘o’, in the Babczyn 2 borehole section. It contains marine palynomorphs(dinoflagellate cysts) and foraminiferal assemblages indicating a marine environment. The low-diversity benthic foraminiferal assemblages are dominated by opportunistic, shallow infaunally living species, preferring muddy or clayey substrate for thriving, brackish to normal marine salinity, and inner shelf environment. Dinoflagellate cyst assemblages, although taxonomically impoverished, consist of marine species;euryhaline forms that tolerate increased salinity are missing. Relatively common microfossils found in clay intercalations within gypsum have important palaeogeographical implications:they strongly suggest that there existed an additional inflow channel supplying the Polish Carpathian Basin from the south during the evaporite deposition and afterwards.展开更多
文摘In the North-East of the Moldavian Platform, the upper Badenian is composed of three lithologic units, on top of which there is Limestones and Marls with Lithothamnium Formation. At the level of this formation, the geological research conducted in four localities near the Prut Valley demonstrated, based on two new foraminifera genera identified in this area--Oolina and Velapertina-favorable conditions for the development of the stenohaline fauna, a marine shelf environment with warm water, as well as the certitude regarding the age of the late Badenian for these. These results were not previously reported in this area.
基金supported by National Fund for Environmental Protection and Water Management
文摘Studies on Middle Miocene Badenian gypsum in various parts of Central Paratethys,the oldest widespread primary marine gypsum,in western Ukraine,southern Poland and Moravia (Czech Republic) indicate that there are three principal gypsum facies:crystalline gypsum,stromatolitic gypsum and clastic gypsum.The latter typically occurs between crystalline and stromatolitic gypsum and between stromatolitic gypsum and the land.In addition,it is common in channels within gypsum microbialites,and is the main facies during the deposition of the upper part of Badenian gypsum when important bathymetric differences existed within the marginal part of the Carpathian Foredeep Basin,the largest foredeep basin in Europe.Within crystalline gypsum facies,it is observed the overall size of the crystals increases and that the layering declines towards the permanent,stabilized brine body,and thus the giant gypsum intergrowths-non-layered coarse-crystalline selenite is the end-member of gypsum facies continuum.Typically it passes into layered selenites although owing to fluctuations of pycnocline level,some transitional gypsum subfacies may be missing both in the vertical section as well as in particular outcrops.The following important controls on the development of gypsum facies have been identified:pycnocline level fluctuations,brine level fluctuations including brine sheets and floods,rare marine transgressions,pedogenesis leading to "alabastrine" gypsum development,and rate of inflow of continental water.
基金jointly supported by the National Science Centre, Poland,grant No. UMO-2017/27/B/ST10/01129 to the first authorthe statutory funds of the PGI-NRI (project 62.9012.1948.00.0 to the third author)。
文摘The middle Miocene Badenian evaporite basin of the Carpathian Foredeep Basin was a saline lake, separated by a barrier from the sea and supplied with seawater seeping through the barrier or overflowing it occasionally in the form of short-lived marine transgressions. Such transgressions could leave behind marine microfossils in marly clay intercalations. One of them(2.3 m thick) occurs in the uppermost part of the sulphate sequence, in the unit ‘o’, in the Babczyn 2 borehole section. It contains marine palynomorphs(dinoflagellate cysts) and foraminiferal assemblages indicating a marine environment. The low-diversity benthic foraminiferal assemblages are dominated by opportunistic, shallow infaunally living species, preferring muddy or clayey substrate for thriving, brackish to normal marine salinity, and inner shelf environment. Dinoflagellate cyst assemblages, although taxonomically impoverished, consist of marine species;euryhaline forms that tolerate increased salinity are missing. Relatively common microfossils found in clay intercalations within gypsum have important palaeogeographical implications:they strongly suggest that there existed an additional inflow channel supplying the Polish Carpathian Basin from the south during the evaporite deposition and afterwards.
