Oligocene-Early Miocene Planktonic Microbiostratigraphy and Paleoenvironments of the South Slovakian Basin (Lučenec Depression)

Abstract Oligocene and Lower Miocene sediments of the Lučenec Depression were studied to demonstrate the planktonic bioevents and climatic proxies from the Číž Formation (Rupelian) and Lučenec Formation (Chattian-Aquitanian) on the basis of quantitative analyses of foraminifers and calcareous nannofossils. The oldest nannofossil assemblages of the Číž Formation belonged to the NP23 Zone and were dominated by Reticulofenestra ornata known for preference of temperate eutrophic water conditions. An increase in bioproductivity was documented by abundant large-sized planktonic foraminifers (e.g. Turborotalia ampliapertura, Paragloborotalia nana, Subbotina gortanii) and epifaunal to shal-low-infaunal benthic species. The middle part of the Číž Formation reveals a lowstand progradation of deltaic sediments of the Rapovce Member. There, the planktonic foraminifers are impoverished in both size and diversity, containing mostly tenuitellid and cassigerinellid species, probably as a result of decreased salinity and increased anoxia in the Tard Clay. Contrary of this, the benthic foraminifers are rich, mainly the infaunal forms of uvigerinid species. They probably proliferated due to a high organic flux from riverine input. Open marine conditions were restored in the upper part of the Číž Formation above the lowest occurrence (LO) of Cyclicargolithus abisectus on the NP23-NP24 zone boundary. The transitional interval between the Číž and Lučenec formations (O5/O6 - NP24/25) was approximated by the HOs of Paragloborotalia opima and Sphenolithus distentus and the LOs of Globigerinoides primordius and Pontosphaera enormis. Benthic foraminifera of the Lučenec Formation indicate a high productivity and oxygen-deplected environ-ments. The Oligocene-Miocene boundary in the Lučenec Formation was appointed by the HOs of Helicospahera recta and Dictyococcites bisectus. Foraminiferal markers of this boundary were established from the HO of Globigerina ciperoensis and the LO of G. ottnangiensis. The highest nannofossil dating in the Lučenec Formation is recorded by the LOs of Helicosphaera mediterranea (NN1 Zone) and Discoaster druggi (NN2 Zone). The uppermost part of the Lučenec Formation contained many Paratethys benthic foraminifera, such as Uvigerina posthantkeni.

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FORAMINÍFEROS BENTÓNICOS RECIENTES EN LAS AGUAS PROFUNDAS DE LA CUENCA DE PANAMÁ: ECOLOGÍA Y SU POSIBLE RELACIÓN CON LAS CORRIENTES DE FONDO

Bulletin of Marine and Coastal Research ◽

10.25268/bimc.invemar.2013.42.1.58 ◽

2016 ◽

Vol 42 (1) ◽

Author(s):

Germán David Patarroyo Camargo ◽

José Ignacio Martínez Rodríguez

Keyword(s):

Benthic Foraminifera ◽

Deep Sea ◽

Lower Surface ◽

Sea Floor ◽

Bottom Currents ◽

High Productivity ◽

Surface Productivity ◽

Sea Currents ◽

The Relationship ◽

Foraminíferos Bentónicos

The relationship between recent benthic foraminifera and bottom currents in the Panama basin (Colombian Pacific) is examined, and the main ecological variables which control the distribution of benthic foraminifera are discussed. The benthic foraminiferal study of 24 core top samples and the integration with previous reports, support the view that in upwelling areas or under high terrigenous influx, the assemblages are dominated by infaunal forms such as Uvigerina, Bolivina, Globobulimina, and Chilostomella, beside common forms such as Uvigerina peregrina Cushman and Epistominella spp., which are indicative of high productivity. In contrast, epifaunal forms such as Cibicidoides, Laticarinina, and Hoeglundina are more common on the flanks of the Cocos and Carnegie Ridges indicating a lower surface productivity and a larger content of dissolved oxygen on the sea floor. Infaunal foraminifera are dominated by Siphouvigerina proboscidea (Schwager). In addition, several proxy taxa of the intensity of deep sea currents were detected in the analyzed assemblages. From these taxa, Cibicides wuellerstorfi (Schwager) has the best proxy potential for the reconstruction of intense bottom currents in sediments from the Cocos and Carnegie Ridges for the Holocene.

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Benthic foraminifera as ecological indicators in the Tunda Island Waters, Serang District, Banten Province, Indonesia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d210735 ◽

2020 ◽

Vol 21 (7) ◽

Author(s):

ISNI NURRUHWATI ◽

FACHRI ARDIANSYAH ◽

YUNIARTI ◽

LINTANG PERMATA SARI YULIADI ◽

Ruhyat Partasasmita

Keyword(s):

Water Quality ◽

Coral Reefs ◽

Benthic Foraminifera ◽

Human Activities ◽

Ecological Factors ◽

Ecological Indicators ◽

Coastal Development ◽

Mangrove Forests ◽

Benthic Foraminifers ◽

A Site

Abstract. Nurruhwati I, Ardiansyah F, Yuniarti, Yuliadi LPS, Partasasmita R. 2020. Benthic foraminifera as ecological indicators in the Tunda Island Waters Serang District, Banten Province, Indonesia. Biodiversitas 21: 3142-3148. Coral reef communities all across Southeast Asia are experiencing intense pressures from extensive tourism and massive coastal development. A prediction regarding coral reefs’ capacity to recover is a necessity since it is constantly exposed to damaging events such as mass bleaching and increased erosion. Tunda Island (which is highly rich in biodiversity and include coral reefs, mangrove forests, seagrass, and algae meadows) was sampled at 10 different sites in August 2019. Coral reefs are highly influenced by ecological factors such as temperature variability, salinity, DO, and pH. The assessments were conducted using the FORAM Index (FI) to accurately predict the capacity of coral reefs to recover based on relative abundances of symbiont-bearing larger benthic foraminifera in reef sediments. The FI values ranged from 3.7 to 7.9 with a median of 4.7 and the average of 5 indicates that the water quality should support the recovery of reefs by reef-building corals and symbiont-bearing larger benthic foraminifers. The lowest FI value sampled was recorded from a site with extensive human activities (FI=3.4), while the highest one was recorded from a site with minimal to none human activities (FI=7.9), which indicates that the deterioration of water quality is caused by wastes from tourism activities near the coastal area.

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Middle Miocene planktonic microfossils and lower bathyal foraminifera from offshore southern California

Journal of Paleontology ◽

10.1017/s0022336000021788 ◽

1986 ◽

Vol 60 (2) ◽

pp. 249-267

Author(s):

Ted F. W. Bergen ◽

Joanne Sblendorio-Levy ◽

John T. Twining ◽

Richard E. Casey

Keyword(s):

New Species ◽

New Taxa ◽

Benthic Foraminifera ◽

Southern California ◽

Middle Miocene ◽

Calcareous Nannofossils ◽

Calcareous Nannofossil ◽

New Subspecies ◽

Submarine Ridge ◽

Age Range

Lower bathyal sediments representing portions of the Luisian and Mohnian stages of Kleinpell (1938) occur on a submarine ridge near Tanner Bank, offshore southern California. The presence of abundant and well-preserved calcareous nannofossils, diatoms, silicoflagellates, radiolarians and foraminifera allows accurate correlations with the onshore type sections of these stages. In terms of the calcareous nannofossil zones, the age range is from the Sphenolithus heteromorphus Zone to the Discoaster kugleri Zone. Although abundant benthic foraminifera indicative of the Luisian and Mohnian are present, they are accompanied by species more characteristic of the Pliocene Repettian Stage of Natland (1952) and the Pliocene-Miocene “Delmontian” Stage of Kleinpell (1938). Many of these latter species live today at lower bathyal depths (below 2,000 m), others occur in lower bathyal sediments as old as Oligocene, but are absent in the onshore type sections of the Luisian and Mohnian stages in coastal California. We ascribe their absence in onshore sequences to deposition at middle bathyal depths. The known chronostratigraphic ranges of several species are extended and five new species and two new subspecies of benthic foraminifera are described.The following new taxa are described: Bolivina pelita n. sp., Cassidulinella inflata n. sp., Globocassidulina undulata n. sp., Cibicidoides mckannai miocenicus n. subsp., C. mckannai sigmosuturalis n. subsp., Pullenia fragilis n. sp., Parafissurina inornata n. sp.

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Micropaleontological proxies as tool to date serpentinite mud volcanisms and seamount subduction and to reconstruct paleoenvironmental conditions in the Mariana convergent margin system (IODP Expedition 366)

10.5194/egusphere-egu2020-7139 ◽

2020 ◽

Author(s):

Arianna Valentina Del Gaudio ◽

Werner E. Piller ◽

Gerald Auer ◽

Patrick Grunert ◽

Walter Kurz

Keyword(s):

Benthic Foraminifera ◽

Planktonic Foraminifera ◽

Detailed Comparison ◽

Extreme Environment ◽

Tropical Species ◽

Calcareous Nannofossils ◽

Pelagic Sediment ◽

Convergent Margin ◽

Flow Activity ◽

Mud Flow

The Mariana forearc system represents the only known currently active serpentine mud volcanism in a convergent margin setting. Here, International Ocean Discovery Program (IODP) Expedition 366 recovered material from three serpentinite mud volcanoes at increasing distances from the Mariana trench subduction zone along a south-to-north transect: Yinazao (Blue Moon), Fantangis&#241;a (Celestial), and As&#249;t Tesoru (Big Blue). Cores contain serpentinite mud with lithic clasts from the subducting Pacific Plate, forearc crust and mantle. Furthermore, at almost all drilled sites, a thin cover of pelagic sediment containing planktic and benthic foraminifera, calcareous nannofossils, radiolaria and sponge spicules was recovered, constraining the most recent mud volcano activity. The base of the seamounts overlies pelagic sediment and volcanic ash/tephra layers which establish a maximum age for the mud activity. Additionally, separate serpentinite mud flows are intercalated by distinct sedimentary layers.Integrated biostratigraphy, based on planktonic foraminifera and calcareous nannofossils, is used to assess the minimum and maximum age of mud flow activity and of the distinct sedimentary layers and serpentinite mud flow layers. Biostratigraphic information will also provide time indications on lower plate dehydration and serpentinization of the forearc wedge. Preliminary results from Fantangis&#241;a seamount (Site U1497 and U1498) reveal the existence of biostratigraphic marker species for both planktonic foraminifera and calcareous nannofossils. Specifically, the presence of Globigerinella calida, Globorotalia flexuosa, Globorotalia truncatulinoides, Globorotalia tumida, Sphaeroidinella dehiscens (amongst planktic foraminifera) and Gephyrocapsa spp., Pseudoemiliania lacunosa, Reticulofenestra asanoi, Discoaster deflandrei, Discoaster variabilis (amongst calcareous nannofossils) allow a possible age assessment from Late Pleistocene to Late Miocene.Planktonic assemblages are dominated by (sub)tropical Globigerinoides forms such as G. conglobatus, G. ruber, G. elongatus, G. sacculifer, G. trilobus. Other common (sub)tropical species detected are G. menardii, and O. universa, whereas G. siphonifera, N. dutertrei, S. dehiscens and P. obliquiloculata are less common.Benthic foraminifera are less abundant but show high diversity. Forms of Lagena, Cibicidoides, Fissurina, Ehrenbergina, Gyroidina, Melonis, Pullenia, Osangularia, Favulina, Reophax, Rhabdammina, Saccorhiza, and Hormosinella are present. To the best of our knowledge, the occurrence of benthic forms in such environments is highly unusual and has not been recorded in detail so far.Quantitative and statistical analyses on foraminifera assemblages will provide information on water column and bottom water conditions. Moreover, a detailed comparison between assemblages pre- and post-volcanism may reflect possible changes in the ecological conditions.Collected data will not only allow to constrain in time the evolution of submarine volcanoes in the Mariana convergent system but also to investigate foraminifera ecology in such an extreme environment.&#160;

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Source areas of the Grybów sub-basin: micropaleontological, mineralogical and geochemical provenance analysis (Outer Western Carpathians, Poland)

Geologica Carpathica ◽

10.1515/geoca-2015-0042 ◽

2015 ◽

Vol 66 (6) ◽

pp. 515-534 ◽

Cited By ~ 2

Author(s):

Marta Oszczypko-Clowes ◽

Patrycja Wójcik-Tabol ◽

Mateusz Płoszaj

Keyword(s):

Middle Eocene ◽

Source Rocks ◽

Calcareous Nannofossils ◽

Provenance Analysis ◽

Outer Western Carpathians ◽

Granite Type ◽

Tectonic Window ◽

Quantitative Analyses ◽

The Subject ◽

Geochemical Investigation

Abstract The Grybów Unit occurring in the Ropa tectonic window was the subject of micropaleontological and geochemical investigation. Studies, based on calcareous nannofossils, proved that the level of reworked microfossil is not higher than 22 % and it varies between two sections. Quantitative analyses of the reworked assemblages confirmed the domination of Cretaceous and Middle Eocene species. The Sub-Grybów Beds, Grybów Marl Formation and Krosno Beds were assigned to the Late Oligocene and represent the terminal flysch facies. Detrital material accumulated in the Oligocene sediments originated from the Marmarosh Massif, which is the eastern prolongation of the Fore-Magura Ridge. The microscopically obtained petrological features agree with the chemical composition of the samples. Mica flakes, rounded grains of glauconite, heavy mineral assemblage, including abraded grains of zircon, rutile and tourmaline as well as charred pieces of plant tissues are reworked components. Enrichment in zircon and rutile is confirmed geochemically by positive correlation between Zr and SiO2. Zr addition is illustrated on 10×Al2O3–Zr–200×TiO2 and Zr/Sc vs. Th/Sc diagrams. Interpretation of the A–CN–K diagram and variety of CIA and CPA values indicate that the source rocks were intensely weathered granite-type rocks.

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Palaeoenvironmental significance of a late Miocene benthic foraminifera fauna from Apostoli Formation, Central West Crete, Greece

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.17113 ◽

2018 ◽

Vol 34 (2) ◽

pp. 627

Author(s):

H. DRINIA

Keyword(s):

Organic Matter ◽

Late Miocene ◽

Sea Water ◽

Nutrient Content ◽

Middle Part ◽

Great Role ◽

Benthic Foraminifers ◽

Shallow Marine ◽

Palaeoecological Reconstruction ◽

Early Late

The palaeoenvironmental and palaeoecological reconstruction of the Apostoli Basin (Crete, Rethymnon Region) during early Late Miocene by means of benthic foraminifers is given. Biologically important factors, such as oxygen and nutrient content of sea-water, played a great role in the evolution of the palaeoecosystem. A gradual deepening took place during the deposition of the Apostoli Formation. The sediments of the lower part of the formation document a shallow-marine environment with vegetation in the neighborhood. In the middle part of the formation sediments are characterized by intermediate oxygenated conditions, whereas the upper part of it is characterized by the establishment of a restricted envrironment, where organic matter accumulates and infaunal opportunistic species capable of surviving in stressed conditions dominate, being favoured by abundant nutrients.

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DIVERSITY AND ABUNDANCE TRENDS OF BENTHIC FORAMINIFERA FROM THE SOUTHERN PART OF THE IRAKLION BASIN, CENTRAL CRETE

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.16809 ◽

2018 ◽

Vol 36 (2) ◽

pp. 772 ◽

Cited By ~ 2

Author(s):

H. Drinia ◽

A. Antonarakou ◽

N. Tsaparas

Keyword(s):

Surface Sediments ◽

Middle Part ◽

Biological Information ◽

Trophic Conditions ◽

Data Set ◽

Near Surface ◽

Bottom Waters ◽

Quantitative Analyses ◽

First Time ◽

Made In

Benthic foraminiferai fossil assemblages of the Roufas Section, southern Iraklion Basin, central Crete, were analyzed for the first time. Taxonomic and quantitative analyses were made in order to obtain paleoenvironmental (physical as well biological) information. A data set has been subjected to R- and Q-mode cluster analyses in order to demonstrate the linkage between taxa distribution and paleoenvironmental gradients. Our results suggest that oxygenation and trophic conditions of the near-surface sediments are the most important factors that control the community structure of the benthic foraminiferai fauna. The application of the oxygen transfer function - based on the use of benthic foraminiferai taxa from oxyphilic habitats - to the benthic faunas of the Roufas Section, allows the reconstruction of the oxygen contents of the bottom waters. Apart from the middle part of the section, no severe disturbances are recorded, pointing to the fact that we are dealing with an overall rather well ventilated water column during most of the part of the sequence.

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Late quarterly paleooceanology of the Norwegian Sea on the basis of analysis of benthic foraminifers

Moscow University Bulletin. Series 4. Geology ◽

10.33623/0579-9406-2020-2-34-42 ◽

2020 ◽

pp. 34-42

Author(s):

L. A. Kireenko ◽

L. F. Kopaevich ◽

A. G. Matul

Keyword(s):

Deep Water ◽

Benthic Foraminifera ◽

Research Vessel ◽

Benthic Foraminifers ◽

Norwegian Sea ◽

The North ◽

North Eastern ◽

Greenland Basin ◽

North Eastern Part

Deep-water cores selected at AMK 5536 and 5524 stations on the 68th cruise of the research vessel «Academik Mstislav Keldysh» from the north-eastern part of the Norwegian-Greenland basin were investigated by sedimentological and micropaleontological methods. Changes in benthic foraminifera communities in the Norwegian Sea, their changes in time, which make it possible to use paleooceanological reconstructions and associate them with marine isotope stages are considered.

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Miocene biostratigraphy and paleoecology from dinoflagellates, benthic foraminifera and calcareous nannofossils on the Colombian Pacific coast

Marine Micropaleontology ◽

10.1016/j.marmicro.2018.05.002 ◽

2018 ◽

Vol 141 ◽

pp. 42-54 ◽

Cited By ~ 2

Author(s):

Andrés-Felipe Duque-Herrera ◽

Javier Helenes ◽

Andrés Pardo-Trujillo ◽

José-Abel Flores-Villarejo ◽

Francisco-Javier Sierro-Sánchez

Keyword(s):

Benthic Foraminifera ◽

Pacific Coast ◽

Calcareous Nannofossils ◽

Colombian Pacific

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Post-glacial Foraminifera of the incised Yangtze paleo-valley and paleoenvironmental implications

Journal of Paleontology ◽

10.1017/jpa.2017.66 ◽

2017 ◽

Vol 91 (6) ◽

pp. 1102-1122 ◽

Cited By ~ 2

Author(s):

Xue Ke ◽

Baohua Li ◽

Zongyan Zhang ◽

Yi Wei ◽

Fei Hu ◽

...

Keyword(s):

Sea Level ◽

Middle Part ◽

The Other ◽

Glacial Deposit ◽

Benthic Foraminifers ◽

The Holocene ◽

Middle Holocene ◽

Sea Level Fluctuations ◽

The Core ◽

Abundance And Diversity

AbstractThree gravity cores (LZK1, ZKA4, and CSJA6) from the incised Yangtze paleo-valley comprise a thick sequence of the post-glacial deposit. Nineteen genera (26 species) of the benthic foraminifers are described from these cores, with detailed down-core foraminiferal variations to investigate their paleoenvironmental implications. Three foraminiferal assemblages are recognized for the lower, middle, and upper parts of the cores respectively. The lower part is dominated byAmmonia beccariivar. andFlorilus decoruswith lower abundance and diversity. In the middle part, the foraminifers are abundant and diverse, dominated by bothAmmonia beccariivar. andElphidium advenum.Cavarotalia annectens,Pararotalia nipponica, and porcellaneous benthic foraminiferal forms are always present, sometimes abundant. The upper part is characterized by theAmmonia beccarii-Elphidium magellanicumassemblage, except for the Core ZKA4, which is barren of foraminifers in this interval. AMS14C dates and foraminiferal assemblages both confirm that the transgression-regression sequence in these cores belongs to the “Ammoniatransgression” during the Holocene. In addition to documenting the post-glacial sea-level fluctuations, the benthic foraminifers also reflect a warmer climate during the early–middle Holocene. The foraminiferal differences among the three cores can be used to interpret the influence of seawater during the post-glacial sea-level fluctuations. The area in the vicinity of Core ZKA4 was affected by marine water only during the middle Holocene, which was much shorter than the areas of the other cores.

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