Vlasta Premec-Fućek

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Morana Hernitz Kučenjak

Ivan Mesić

Jasna Tadej

Morana Hernitz-Kučenjak

Renata Slavković

Vladimir Veseli

SŽ

Sanja Živković

University of Zagreb

Goran Mikša

Josip Tišljar

University of Zagreb

Dražen Balen

University of Zagreb

Cooperative Institutions

University of Zagreb

Croatian Geological Survey

Institute of Mineralogy

University of Milan

Terra

University of Urbino

Croatian Academy of Sciences and Arts

University of Arts

University of Osijek

Croatian Natural History Museum

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Glass spherules in Upper Uocene flysch of Croatian Adriatic - evidence of an impact into carbonate target?

Tihomir Marjanac Vladimir Bermanec Vlasta Premec-Fućek Ljerka Marjanac Ana Marija Tomša

Glass spherules occur at 7 levels in Late Eocene flysch marls of Central Dalmatian Basin (Croatian Eastern Adriatic), which are exposed in hinterland of the city of Solin. The spherules occur at one level in Globigerinatheka semiinvoluta zone, and in six levels of Globigerinatheka index zone, and their stratigraphic spacing ranges from 1, 5 m to 93, 3 m. The best studied, and with most spherules recovered, is a composite turbidite 2-7, which is youngest in the sequence. It comprises impact-generated debris in its marl part, which is represented by perfectly clear (sometimes slightly dimmed) glass spherules 91 to 530 μ across ; teardrop transparent microtektites 1225 μ long, and fragments of vesicular glass 450 to 1000 μ across. Some spherules and microtektites comprise small bubbles with diameter up to 41 μ . Chemical composition of the spherules, poor in SiO2 and relatively rich in CaO and MgO indicates possible carbonate target.

Marl

Flysch

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Planktonic foraminiferal biostratigraphy and lithology of the Upper Cretaceous (upper Campanian-Maastrichtian) and Palaeogene succession of the Palmyrides (Syria)

Geologia Croatica (2021)

Vlasta Premec-Fućek Morana Hernitz Kučenjak Gabrijela Pecimotika

An upper Campanian to upper Oligocene stratigraphic succession has been examined from six deep exploration wells in the Palmyrides area of Syria. Most of the sedimentary succession contains rich and well to moderately preserved planktonic foraminiferal assemblages that enable successful age determination. The upper Campanian and Maastrichtian planktonic fauna is highly diverse with domination of warm water taxa such as Globotruncana aegyptiaca, Gansserina gansseri, Globotruncanella havanensis, Globotruncanita angulata and Pseudotextularia elegans. The most dramatic turnover occurred across the Cretaceous/Palaeocene boundary when most planktonic foraminiferal species became extinct. The oldest Palaeocene planktonic foraminiferal assemblage, rich in the number of specimens, but not very diverse, includes the following species: Eoglobigerina eobulloides, Globanomalina archeocompressa, Chiloguembelina morsei, Woodringina claytonensis and Parasubbotina pseudobulloides. The late Palaeocene is marked by origination of the morozovellids, acarininids and globanomalinids, while the early Eocene is characterized by a tropical assemblage, dominated by muricate species, and by intensive speciation of Acarinina and Subbotina in the latest part. Most of these species continue into the middle Eocene and become a significant component of the planktonic community. The middle Eocene is characterized by intensive speciation and domination of warm water genera such as Acarinina, Morozovelloides, and to a lesser degree Turborotalia, Globigerinatheka and Hantkenina. The middle/late Eocene boundary is marked by double extinction of the last muricate taxa Acarinina mcgowrani and Morozovelloides crasssatus, which indicate a variable climate, water column instability, and loss of surface habitats. In contrast, Turborotalia and Globigerinateheka become more important in the late Eocene. The Eocene/Oligocene boundary is marked by the extinction of most warm water taxa including Turborotalia cerroazulensis group, Hantkenina, Globigerinatheka and some subbotinids. The beginning of the early Oligocene is indicated by the domination of cool water taxa such as Dentoglobigerina, Globorotaloides, Tenuitella and Chiloguembelina. Speciation of the spinose surface dweller Ciperoella ciperoensis group reflects warming in the late Oligocene. The combined observations of lithology with the diversity and composition of planktonic foraminifera assemblages indicate that the Palmyrides area in Syria was a Tethyan bioprovince with a tropical to subtropical climate from the late Campanian to the end of the Eocene with deposition in deep sea environments (upper bathyal to outer shelf). In contrast, Oligocene deposits and their microfossil content suggest temperate to warm climate conditions and sedimentation in middle to inner shelf environments.

Paleogene

10.4154/gc.2021.05

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Upper Campanian to Maastrichtian foraminiferal assemblages of the Palmyra Region, Syria

Damir Stanković Ivan Mesić Zlata Ivaniček Morana Hernitz Kučenjak Vlasta Premec-Fućek

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Lithofacies and Biofacies of the Cretaceous and Paleogene Carbonate Sediments in Kate-1 offshore well (Kornati Area, Croatia, Adriatic Sea)

Vladimir Veseli Josip Tišljar Jasna Tadej Vlasta Premec-Fućek

The Kate-1 exploratory well has penetrated Middle and Lower Eocene (1998-2412 m), Upper Santonian (2412-3234 m), Turonian-Lower Santonian (3312-4370 m), Upper Cenomanian (4370-4440 m), Cenomanian (4740-5110 m), Upper (5110-5640 m) and Lower Albian (5640-5920 m) and finally the Lower Aptian deposits (5920-5968m + xm. During the Early Aptian, patch reef and biostromal limestones were deposited, followed by gradual shallowing and emersion reaching its maximum by the end of the Aptian. The emersion phase lasted throughout the Late Aptian and possibly the lower part of the Albian. During the Albian, sedimentation took place in restricted shoals and/or lagoonal environment, whereas towards the end of the Late Albian little restricted lagoons were formed, with anoxic characteristics, and supratidal environments with early diagenetic dolomites. During the Early and Middle Cennomanian, lagoonal and shallow subtidal sedimentation was renewed, while extensive shoals with high water energy, inhabited destruction of collonial organisms (bioherms), occured by the end of Cenomanian.Those organisms produced large amounts of coquina and coquinite limestone. Due to eustatic and vertical tectonic movements during the Early Turonian, the greater part of the carbonate platform was deepended and environments with characteristics of open and drowned platform were created. Limestones made up of micrites, fine rudist particles and oligosteginids were deposited. During the Late Turonian and Early Santonian, restricted shoals and lagoonal environmsnts were renewed with periodical shallowing up to intertidal. By the middle of the Senonian, general transgression occured whereby sedimentary conditions were created similat to those in the Early Turonian (oligostegina limestones). By the end of the Senonian, due to the renewed intensive shallowing, the sedimentation occured mostly in lagoons and shoals with agile water, and sporadic formation of rudist bioherms. The shallowing reaches its maximum with succesive change of fresh water by the end of the Late Senonian when emersion, paleokarstification and corrosion occured and Microcodium forms were formed. A new transgression took place in the Early Eocene, accompanied by the deposition of shallow-water and deeper subtidal (carbonate platform slope or ramp) limestones succeeded by nummulite-discocyclina-bearing limestones.

Aptian

Cenomanian

Carbonate platform

Shoal

Subaerial

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The upper Oligocene and lower miocene of the western part of the Tripolitania basin (Libya) : biostratigraphy and paleoecology

Morana Hernitz-Kučenjak Vlasta Premec-Fućek Ivan Mesić

Paleoecology

Neogene