Paleoenvironmental reconstruction of the Middle Eocene Trieste-Pazin basin (Croatia) from benthic foraminiferal assemblages

Živković, Sanja; Glumac, Bosiljka

doi:10.2113/gsmicropal.53.4.285

Cited by 12 publications

(12 citation statements)

References 56 publications

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“…The subtle and consistent differences in isotope values (Fig. 4), the overall good preservation of microfossils (Živković & Babić 2003;Živković & Glumac 2007) and the lack of a significant amount of secondary carbonate in the studied marls suggest the absence of notable diagenetic overprint. High clay content of both studied marl types would have prevented serious vertical circulation of porewater, creating a relatively closed diagenetic system.…”

Section: Discussionmentioning

confidence: 66%

“…6). Changing paleoceanographic conditions have been reported from the same section of the Globigerina Marls unit by Živković & Glumac (2007), based on assemblages of small benthic foraminifera. Although they used much broader sampling intervals, these authors did identify episodes of higher refractory organic matter flux and/ or lowered oxygen concentrations in the bottom waters during overall mesotrophic conditions.…”

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confidence: 92%

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Climatic cycles recorded in the Middle Eocene hemipelagites from a Dinaric foreland basin of Istria (Croatia)

Lužar-Oberiter¹,

Hochuli²,

Babić³

et al. 2010

Geologica Carpathica

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Middle Eocene hemipelagic marls from the Pazin-Trieste Basin, a foreland basin of the Croatian Dinarides, display repetitive alternations of two types of marls with different resistance to weathering. This study focuses on the chemical composition, stable isotopes, and palynomorph content of these marls in order to better understand the nature of their cyclic deposition and to identify possible paleoenvironmental drivers responsible for their formation. The less resistant marls (LRM) have consistently lower carbonate content, lower δ 18 O and δ 13 C values, and more abundant dinoflagellate cysts than the more resistant marls (MRM). We interpret these differences between the two marl types to be a result of climatic variations, likely related to Milankovitch oscillations. Periods with wetter climate, associated with increased continental runoff, detrital and nutrient influx produced the LRM. Higher nutrient supply sparked higher dinoflagellate productivity during these times, while reduced salinity and stratification of the water column may have hampered the productivity of calcareous nannoplankton and/or planktonic foraminifera. In contrast, the MRM formed during dryer periods which favoured higher carbonate accumulation rates. This study provides new information about the sedimentary record of short-scale climate variations reflected in wet-dry cycles during an overall warm, greenhouse Earth.

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Section: Discussionmentioning

confidence: 66%

mentioning

confidence: 92%

Climatic cycles recorded in the Middle Eocene hemipelagites from a Dinaric foreland basin of Istria (Croatia)

Lužar-Oberiter¹,

Hochuli²,

Babić³

et al. 2010

Geologica Carpathica

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“…The majority of known macrofossil localities are situated around the contact of both lithologies (Mikuž et al 2014), where the foraminiferal limestones grade into the flysch and are therefore called "Transitional Beds". These "Transitional Beds" (commonly called also "Marls with Crabs") consist of calcareous marls, Globigerina marls, and breccias, which are conformably overlain by the more coarsely grained flysch beds (Živkovic & Glumac 2007). The 20-km-wide belt of flysch sediments extends from Ankaran (Slovenia) in the northwest, to Labin (Croatia) in the southeast (Mikuž et al 2014).…”

Section: Stratigraphical and Geographical Settingmentioning

confidence: 99%

“…The Trieste-Pazin, a foreland basin of Alpine type with typical marine flysch deposits (Živkovic & Glumac 2007). The basin came into existence during the early to middle Eocene as a result of subduction and closure of the Tethys Ocean (Babić & Zupanič 1996).…”

Section: Stratigraphical and Geographical Settingmentioning

confidence: 99%

The first record of paguroids from the Eocene of Istria (Croatia) and further phylogenetic refinement of the Paguroidea (Crustacea, Anomura)

Gašparič¹,

Fraaije²,

Robin³

et al. 2016

Bull. Geosci.

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A paguroid, Lessinipagurus vasjamikuzi sp. nov., is described from Eocene (upper Bartonian-lower Priabonian) of Istria, on the basis of a single right chela from Gračišće near Pazin, western Croatia. The specimen originates from beds of olistostrome breccias that formed in a bathyal setting. In addition, a new genus, Prexylopagurus, accommodated in the new family Xylopaguridae, is erected; based on a distinctive set of characters of the dorsal carapace, chelae, and operculate tergite of sixth abdominal somite. The phylogenetic relationships of the new family Xylopaguridae are discussed; it appears to have originated in the Tethyan Realm, possibly as early as the Jurassic, and displays a Tethyan distribution during the Cenozoic. Three extant species are transferred to the new genus, resulting in three new combinations: Prexylopagurus anthonii, P. philippinensis, and P. caledonicus. The palaeoecology and palaeobiogeography of the newly erected taxa are discussed. The bloom of diversity of Lessinipagurus during the late Eocene parallels the evolution and subsequent ecological expansion of grasses, especially of reed and bamboo, thus constituting a rare example of coevolution between land plants and marine organisms. The holotype of Lessinipagurus vasjamikuzi sp. nov. shows remains of an interesting syn-vivo balanomorph association; this is the earliest record of such barnacles on a decapod crustacean in the fossil record, and the sole record from an anomuran to date. •

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“…Despite these problems, which require the comparison of modern and ancient foraminiferal fauna to be carried out cautiously, smaller benthic foraminifera are still indispensable in interpreting past environments and palaeoceanographic settings e.g. [32,[57][58][59][60]. Taking these complications into account, we attempt to estimate the palaeoenvironmental factors that controlled the distribution of small benthic foraminifera in the Oligocene foreland basin of Ithaki Island, using knowledge of modern foraminiferal ecology, morphology and microhabitats.…”

Section: Environmental Setting Of the Oligocene Afales Basin Derived mentioning

confidence: 99%

Palaeoenvironmental reconstruction of the Oligocene Afales Basin, Ithaki island, western Greece

Drinia

2009

Open Geosciences

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Assemblages of benthic foraminifera from one clastic succession in the Afales Basin (Ithaki Island, western Greece) were investigated to reconstruct palaeoenvironmental conditions during the Oligocene. The section consists of alternating hemipelagic marls and detrital deposits, designated as flysch-like beds, attributed to biostratigraphic Zones P20 and P21. Planktic percentages are mostly high (66-80%). Benthic foraminiferal assemblages comprise calcareous and agglutinated taxa (up to 15%). The prevalence of epifaunal foraminifera indicates good ventilation of the bottom water resulting from basin morphology, which enabled the undisturbed flow of water throughout the basin. Palaeodepth estimates imply bathyal deposition, from about 800 to 1200 m deep. The benthic foraminiferal fauna is of high diversity along the section, as is expected in deep marine environments. The abundances of the most common foraminiferal taxa (Cibicidoides spp., Oridorsalis umbonatus, Gyroidinoides spp., Stilostomella spp., Nodosariidae, Nuttallides umbonifera) are quite variable and imply generally oligotrophic to mesotrophic environmental conditions with variable organic flux.

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Paleoenvironmental reconstruction of the Middle Eocene Trieste-Pazin basin (Croatia) from benthic foraminiferal assemblages

Cited by 12 publications

References 56 publications

Climatic cycles recorded in the Middle Eocene hemipelagites from a Dinaric foreland basin of Istria (Croatia)

Climatic cycles recorded in the Middle Eocene hemipelagites from a Dinaric foreland basin of Istria (Croatia)

The first record of paguroids from the Eocene of Istria (Croatia) and further phylogenetic refinement of the Paguroidea (Crustacea, Anomura)

Palaeoenvironmental reconstruction of the Oligocene Afales Basin, Ithaki island, western Greece

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