Eocene planktonic foraminifera from Jakomići locality, Pazin Basin

S ciljem odredbe starosti naslaga te paleoekološke interpretacije okoliša analizirane su naslage lapora s lokaliteta Jakomići u Pazinskom bazenu. Uzorci su laboratorijski obrađeni metodom muljanja te pripremljeni za mikroskopsku analizu kojom su izdvojene planktonske foraminifere od bentičkih. Izračunat je odnos planktona i bentosa nakon kojeg je slijedilo taksonomsko određivanje planktonskih foraminifera na razini vrste. Na temelju preklapanja stratigrafskih raspona određenih vrsta planktonskih foraminifera utvrđena je starost naslaga srednjeg eocena (gornji dio luteta i donji barton) koja pripada zoni E11 Morozovelloides lehneri. Na temelju udjela planktonskih foraminifera u zajednici dubina taloženja odgovara okolišu gornjeg dijela kontinentalne padine odnosno gornjem batijalu. Određen je eutrofičan do mezotrofičan okoliš raspona dubine vodenog stupca od površinskog sloja do sloja termokline.In order to determine the age of the deposits and paleoecological interpretation of the environment, marl samples from the Jakomići locality in the Pazin Basin were analyzed. The samples were laboratory processed by wet sieving method and prepared for microscopic analysis, which separated the planktonic foraminifera from the benthic ones. The relationship between planktonic and benthic foraminifera was calculated, followed by taxonomic determination of planktonic foraminifera at the species level. Based on the overlap of the stratigraphic ranges of planktonic foraminifera species, the age of the Middle Eocene (upper part of the Lutetian and lower Bartonian), E11 zone Morozovelloides lehneri was determined. Based on the percentage of planktonic foraminifera in the foraminiferal assemblages, the deposition depth corresponds to the environment of the upper bathyal. The eutrophic to mesotrophic range of the environment from the surface layer of the water column to the thermocline layer was determined

Eocene planktonic foraminifera from Jakomići locality, Pazin Basin

S ciljem odredbe starosti naslaga te paleoekološke interpretacije okoliša analizirane su naslage lapora s lokaliteta Jakomići u Pazinskom bazenu. Uzorci su laboratorijski obrađeni metodom muljanja te pripremljeni za mikroskopsku analizu kojom su izdvojene planktonske foraminifere od bentičkih. Izračunat je odnos planktona i bentosa nakon kojeg je slijedilo taksonomsko određivanje planktonskih foraminifera na razini vrste. Na temelju preklapanja stratigrafskih raspona određenih vrsta planktonskih foraminifera utvrđena je starost naslaga srednjeg eocena (gornji dio luteta i donji barton) koja pripada zoni E11 Morozovelloides lehneri. Na temelju udjela planktonskih foraminifera u zajednici dubina taloženja odgovara okolišu gornjeg dijela kontinentalne padine odnosno gornjem batijalu. Određen je eutrofičan do mezotrofičan okoliš raspona dubine vodenog stupca od površinskog sloja do sloja termokline.In order to determine the age of the deposits and paleoecological interpretation of the environment, marl samples from the Jakomići locality in the Pazin Basin were analyzed. The samples were laboratory processed by wet sieving method and prepared for microscopic analysis, which separated the planktonic foraminifera from the benthic ones. The relationship between planktonic and benthic foraminifera was calculated, followed by taxonomic determination of planktonic foraminifera at the species level. Based on the overlap of the stratigraphic ranges of planktonic foraminifera species, the age of the Middle Eocene (upper part of the Lutetian and lower Bartonian), E11 zone Morozovelloides lehneri was determined. Based on the percentage of planktonic foraminifera in the foraminiferal assemblages, the deposition depth corresponds to the environment of the upper bathyal. The eutrophic to mesotrophic range of the environment from the surface layer of the water column to the thermocline layer was determined

Eocene planktonic foraminifera from Jakomići locality, Pazin Basin

S ciljem odredbe starosti naslaga te paleoekološke interpretacije okoliša analizirane su naslage lapora s lokaliteta Jakomići u Pazinskom bazenu. Uzorci su laboratorijski obrađeni metodom muljanja te pripremljeni za mikroskopsku analizu kojom su izdvojene planktonske foraminifere od bentičkih. Izračunat je odnos planktona i bentosa nakon kojeg je slijedilo taksonomsko određivanje planktonskih foraminifera na razini vrste. Na temelju preklapanja stratigrafskih raspona određenih vrsta planktonskih foraminifera utvrđena je starost naslaga srednjeg eocena (gornji dio luteta i donji barton) koja pripada zoni E11 Morozovelloides lehneri. Na temelju udjela planktonskih foraminifera u zajednici dubina taloženja odgovara okolišu gornjeg dijela kontinentalne padine odnosno gornjem batijalu. Određen je eutrofičan do mezotrofičan okoliš raspona dubine vodenog stupca od površinskog sloja do sloja termokline.In order to determine the age of the deposits and paleoecological interpretation of the environment, marl samples from the Jakomići locality in the Pazin Basin were analyzed. The samples were laboratory processed by wet sieving method and prepared for microscopic analysis, which separated the planktonic foraminifera from the benthic ones. The relationship between planktonic and benthic foraminifera was calculated, followed by taxonomic determination of planktonic foraminifera at the species level. Based on the overlap of the stratigraphic ranges of planktonic foraminifera species, the age of the Middle Eocene (upper part of the Lutetian and lower Bartonian), E11 zone Morozovelloides lehneri was determined. Based on the percentage of planktonic foraminifera in the foraminiferal assemblages, the deposition depth corresponds to the environment of the upper bathyal. The eutrophic to mesotrophic range of the environment from the surface layer of the water column to the thermocline layer was determined

Mid-Eocene Thermals record in Istrian Paleogene Basin (Outer Dinarides, Croatia), Neotethys

Several short sections have been studied in Istria (Outer Dinarides, Northern Adriatic) to determine impact of short-term climate variability during the critical period of Mid-Eocene greenhouse climate evolution on pelagic assemblages from the northern mid-latitudes. In order to determine the age of the deposits and paleoecological conditions of the environment, marl samples were laboratory processed and prepared for microscopic analysis. Further taxonomic determination of calcareous nannoplankton and planktonic foraminifera was done together with quantitative research methods. Planktonic foraminifera tests are recrystallized and not suitable for stable isotope data. Because of that, isotope analyses have been proceeded (δ 13C and δ 18O) from bulk sediments and δ 13C is correlated with regional to global results. Based on new calcareous nannofossil biostratigraphy with regional geochronology (Fornaciari et al., 2010), and implementations of available geochemical data for two hyperthermal intervals (Late Lutetian Thermal Maximum and Middle Eocene Climate Optimum CIE), for the first time these events are going to be more precisely dated from the first attempts made by Jovane et al. (2007), where the age was miscorrelated with 41.5 Ma for the MECO, which is actually the LLTM age dated in Southern Hemisphere

Mid-Eocene Thermals record in Istrian Paleogene Basin (Outer Dinarides, Croatia), Neotethys

Several short sections have been studied in Istria (Outer Dinarides, Northern Adriatic) to determine impact of short-term climate variability during the critical period of Mid-Eocene greenhouse climate evolution on pelagic assemblages from the northern mid-latitudes. In order to determine the age of the deposits and paleoecological conditions of the environment, marl samples were laboratory processed and prepared for microscopic analysis. Further taxonomic determination of calcareous nannoplankton and planktonic foraminifera was done together with quantitative research methods. Planktonic foraminifera tests are recrystallized and not suitable for stable isotope data. Because of that, isotope analyses have been proceeded (δ 13C and δ 18O) from bulk sediments and δ 13C is correlated with regional to global results. Based on new calcareous nannofossil biostratigraphy with regional geochronology (Fornaciari et al., 2010), and implementations of available geochemical data for two hyperthermal intervals (Late Lutetian Thermal Maximum and Middle Eocene Climate Optimum CIE), for the first time these events are going to be more precisely dated from the first attempts made by Jovane et al. (2007), where the age was miscorrelated with 41.5 Ma for the MECO, which is actually the LLTM age dated in Southern Hemisphere