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Artículos de revistas sobre el tema "Euxinie"

Autor: Grafiati

Publicado: 16 de noviembre de 2024

Última modificación: 31 de julio de 2025

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1

Grice, K., R. E. Summons, E. Grosjean, et al. "DEPOSITIONAL CONDITIONS OF THE NORTHERN ONSHORE PERTH BASIN (BASAL TRIASSIC)." APPEA Journal 45, no. 1 (2005): 262. http://dx.doi.org/10.1071/aj04023.

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An oil-source rock correlation has been established for the northern onshore Perth Basin (Western Australia) based on unusual aromatic and polar biomarkers attributed ultimately to a green sulphur bacterial source. Several of these biomarkers have been identified throughout the entire Sapropelic Interval of a proven petroleum source rock intersected within a recently discovered marine Permian- Triassic Perth Basin borehole (Hovea–3) and several Perth Basin crude oils. Today, green sulphur bacteria live in the anaerobic zones of stratified lakes or in marine environments with restricted water c

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2

WIGNALL, PAUL B., DAVID P. G. BOND, YADONG SUN, et al. "Ultra-shallow-marine anoxia in an Early Triassic shallow-marine clastic ramp (Spitsbergen) and the suppression of benthic radiation." Geological Magazine 153, no. 2 (2015): 316–31. http://dx.doi.org/10.1017/s0016756815000588.

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AbstractLower Triassic marine strata in Spitsbergen accumulated on a mid-to-high latitude ramp in which high-energy foreshore and shoreface facies passed offshore into sheet sandstones of probable hyperpycnite origin. More distal facies include siltstones, shales and dolomitic limestones. Carbon isotope chemostratigraphy comparison allows improved age dating of the Boreal sections and shows a significant hiatus in the upper Spathian. Two major deepening events, in earliest Griesbachian and late Smithian time, are separated by shallowing-upwards trends that culminated in the Dienerian and Spath

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3

Hutchings, Alec M., and Alexandra V. Turchyn. "A quantification of the effect of diagenesis on the paleoredox record in mid-Proterozoic sedimentary rocks." Geology 49, no. 9 (2021): 1143–47. http://dx.doi.org/10.1130/g48774.1.

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Abstract Iron speciation in ancient sedimentary rocks is widely used to reconstruct oceanic redox conditions over geological time, specifically to assess the extent of oxic, euxinic (anoxic containing sulfide), and ferruginous (anoxic containing iron) conditions. We explore how post-depositional sedimentary processes can skew particular geochemical signals in the rock record. One such process is when aqueous sulfide—including that produced in the sediment column—reacts with sedimentary iron, converting non-sulfide, highly reactive iron minerals to iron-sulfide minerals; this can lead to increa

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4

Mitchell, Ross N., Uwe Kirscher, Marcus Kunzmann, Yebo Liu, and Grant M. Cox. "Gulf of Nuna: Astrochronologic correlation of a Mesoproterozoic oceanic euxinic event." Geology 49, no. 1 (2020): 25–29. http://dx.doi.org/10.1130/g47587.1.

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Abstract The ca. 1.4 Ga Velkerri and Xiamaling Formations, in Australia and the north China craton, respectively, are both carbonaceous shale deposits that record a prominent euxinic interval and were intruded by ca. 1.3 Ga dolerite sills. These similarities raise the possibility that these two units correlate, which would suggest the occurrence of widespread euxinia, organic carbon burial, and source rock deposition. Paleomagnetic data are consistent with Australia and the north China craton being neighbors in the supercontinent Nuna and thus permit deposition in a single large basin, and the

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5

Klomp, Robin, Olga M. Żygadłowska, Mike S. M. Jetten, et al. "Dissolved Mn(III) is a key redox intermediate in sediments of a seasonally euxinic coastal basin." Biogeosciences 22, no. 3 (2025): 751–65. https://doi.org/10.5194/bg-22-751-2025.

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Abstract. Manganese (Mn) is an essential micronutrient and key redox intermediate in marine systems. The role of organically complexed dissolved Mn(III) (dMn(III)-L) as an electron acceptor and donor in marine environments is still incompletely understood. Here, we use geochemical depth profiles of solutes and solids for the sediment and overlying waters and a reactive transport model to reconstruct the seasonality in sedimentary dMn(III)-L dynamics and benthic Mn release in a eutrophic, seasonally euxinic coastal basin (Lake Grevelingen, the Netherlands). Our model results suggest that dMn(II

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6

Shopov, Vladimir, and Maria Stancheva. "Correlation of the zonal schemes in the Quaternary sediments of the Bulgarian Black Sea shelf according to molluscs and ostracods." Geologica Balcanica 24, no. 3 (1994): 77–82. http://dx.doi.org/10.52321/geolbalc.24.3.77.

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The Candona Ostracod Zone corresponds the Upper Chaudinian where the Dreissena rostriformis tschaudae Molluscan Zone is indicated. The Didacna crassa pontocaspia – Dreissena euxinica and Didacna crassa pontocaspia – Alba ovata Molluscan Concurrent-range-zones corresponding to the Cryptocyprideis bogatschovi Ostracod Zone are interpreted respectively in the Middle Pleistocene, Old Euxinian and Uzunlarian Stages. The section of the Upper Pleistocenian (Karangatian) molluscan zones has not been presented for analysis of the Ostracod sequences. The sequence of the molluscan and ostracod zones in t

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7

JIN, CHENGSHENG, CHAO LI, THOMAS J. ALGEO, et al. "Evidence for marine redox control on spatial colonization of early animals during Cambrian Age 3 (c. 521–514 Ma) in South China." Geological Magazine 154, no. 6 (2016): 1360–70. http://dx.doi.org/10.1017/s0016756816001138.

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AbstractThe early Cambrian Period was a key interval in Earth history with regard to changes in both ocean chemistry and animal evolution. Although increasing ocean ventilation has been widely assumed to have played a key role in the rapid appearance, diversification and spatial colonization of early animals, this relationship is in fact not firmly established. Here, we report a high-resolution Fe-C-S-Al-Ti geochemical study of the lower Cambrian Wangjiaping section from an outer-shelf setting of the Yangtze Sea of South China. Iron speciation data document a redox transition from dominantly e

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8

Wendt, Anna K., Mike A. Arthur, Rudy Slingerland, Daniel Kohl, Reed Bracht, and Terry Engelder. "Geochemistry and depositional history of the Union Springs Member, Marcellus Formation in central Pennsylvania." Interpretation 3, no. 3 (2015): SV17—SV33. http://dx.doi.org/10.1190/int-2014-0228.1.

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Debate continues over paleoenvironmental conditions that prevail during deposition of organic-carbon (C)-rich marine source rocks in foreland basins and epicontinental seas. The focus of disagreement centers largely on paleowater depth and the prevalence of anoxia/euxinia. The issues of paleodepth and water column conditions are important for prediction of lateral variations in source quality within a basin because the viability of a hydrocarbon play depends on a thorough understanding of the distribution of source rock quality and depositional environments. We used inorganic geochemical data

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9

МЕРЕНКОВА, С. И., Г. А. КАЛМЫКОВ, А. Ю. ПУЗИК, et al. "GEOCHEMICAL FACETS OF THE INIKAN FORMATION AS INDICATORS OF STRATIFICATION AND HYDROCHEMISTRY OF THE CAMBRIAN PALEOBASIN." Геология и геофизика 65, no. 2 (2024): 265–87. http://dx.doi.org/10.15372/gig2023140.

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Выполнены геохимические исследования пород иниканской свиты из береговых обнажений р. Юдома. Для всех проанализированных литологических разностей характерно значительное обогащение B, Ni, Mo, Ag, Sb, U, т. е. редокс-чувствительными элементами, а также элементами, способными к биоосаждению. Источником элементов являлась морская вода, выщелачивающая их из эолового материала. Установлено, что отложения накапливались в аноксических условиях с периодами возникновения как эвксинных (по-видимому, в придонном слое), так и субоксических условий. Развитие таких аноксических и эвксинных условий вызвано у

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10

Rood, Tim. "Black Sea variations: Arrian's Periplus." Cambridge Classical Journal 57 (December 2011): 137–63. http://dx.doi.org/10.1017/s1750270500001305.

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Comme tous les Grecs, il n'a pas pu ne pas embellir ce qu'il a touché. On retrouve en lui cet éminent esprit d'une race privilégiée qui dans les sujets les plus arides fait pénétrer l'art et même la poésie. … même en quittant … le Périple d'Arrien, nous pouvons dire comme Fuséli en quittant les marbres du Parthénon: ‘Ah! les Grecs, les Grecs, c'étaient des dieux.’ H. Chotard, Le Périple de la Mer Noire par ArrienArrian's Periplus maris Euxini (Circumnavigation of the Euxine) is an ambitious and unusual work. Written in the 130s AD in the form of a letter to the emperor Hadrian, who had himself

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11

Grice, Kliti, Alex I. Holman, Chloe Plet, and Madison Tripp. "Fossilised Biomolecules and Biomarkers in Carbonate Concretions from Konservat-Lagerstätten." Minerals 9, no. 3 (2019): 158. http://dx.doi.org/10.3390/min9030158.

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In the vast majority of fossils, the organic matter is degraded with only an impression or cast of the organism remaining. In rare cases, ideal burial conditions result in a rapid fossilisation with an exceptional preservation of soft tissues and occasionally organic matter. Such deposits are known as Lagerstätten and have been found throughout the geological record. Exceptional preservation is often associated with finely crystalline quartz (e.g., cherts), fine sediments (e.g., muds) or volcanic ashes. Other mechanisms include burial in anoxic/euxinic sediments and in the absence of turbidity

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12

Gomes, Maya L., and David T. Johnston. "Oxygen and sulfur isotopes in sulfate in modern euxinic systems with implications for evaluating the extent of euxinia in ancient oceans." Geochimica et Cosmochimica Acta 205 (May 2017): 331–59. http://dx.doi.org/10.1016/j.gca.2017.02.020.

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13

Raiswell, R., and R. A. Berner. "Pyrite formation in euxinic and semi-euxinic sediments." American Journal of Science 285, no. 8 (1985): 710–24. http://dx.doi.org/10.2475/ajs.285.8.710.

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14

Zheng, Wang, Geoffrey J. Gilleaudeau, Linda C. Kah, and Ariel D. Anbar. "Mercury isotope signatures record photic zone euxinia in the Mesoproterozoic ocean." Proceedings of the National Academy of Sciences 115, no. 42 (2018): 10594–99. http://dx.doi.org/10.1073/pnas.1721733115.

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Photic zone euxinia (PZE) is a condition where anoxic, H2S-rich waters occur in the photic zone (PZ). PZE has been invoked as an impediment to the evolution of complex life on early Earth and as a kill mechanism for Phanerozoic mass extinctions. Here, we investigate the potential application of mercury (Hg) stable isotopes in marine sedimentary rocks as a proxy for PZE by measuring Hg isotope compositions in late Mesoproterozoic (∼1.1 Ga) shales that have independent evidence of PZE during discrete intervals. Strikingly, a significantly negative shift of Hg mass-independent isotope fractionati

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15

Cheng, Keyi, Maya Elrick, and Stephen J. Romaniello. "Early Mississippian ocean anoxia triggered organic carbon burial and late Paleozoic cooling: Evidence from uranium isotopes recorded in marine limestone." Geology 48, no. 4 (2020): 363–67. http://dx.doi.org/10.1130/g46950.1.

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Abstract The Early Mississippian (Tournaisian) positive δ13C excursion (mid-Tournaisian carbon isotope excursion [TICE]) was one of the largest in the Phanerozoic, and the organic carbon (OC) burial associated with its development is hypothesized to have enhanced late Paleozoic cooling and glaciation. We tested the hypothesis that expanded ocean anoxia drove widespread OC burial using uranium isotopes (δ238U) of Lower Mississippian marine limestone as a global seawater redox proxy. The δ238U trends record a large Tournaisian negative excursion lasting ∼1 m.y. The lack of covariation between δ2

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16

Archibald, Zofia Halina. "EUXINE SITES." Classical Review 52, no. 1 (2002): 142–44. http://dx.doi.org/10.1093/cr/52.1.142.

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17

WOTTE, THOMAS, та HARALD STRAUSS. "Questioning a widespread euxinia for the Furongian (Late Cambrian) SPICE event: indications from δ13C, δ18O, δ34S and biostratigraphic constraints". Geological Magazine 152, № 6 (2015): 1085–103. http://dx.doi.org/10.1017/s0016756815000187.

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AbstractResults from a high-resolution study of δ13Ccarb, δ18Ocarb, δ34SCAS, δ34SCRSand elemental concentrations (Ca, Fe, Mg, Mn and Sr) in the Furongian Kyrshabakty section, southern Kazakhstan, are reported here. The investigated interval covers the Drumian to Jiangshanian stages of the Cambrian Period, respectively the regionalPtychagnostus atavustoIvshinagnostus ivshini-Irvingella majortrilobite zones. δ13Ccarbdata include the Steptoean positive carbon isotope excursion (SPICE) with a local peak value of +5‰. The onset of SPICE corresponds to theKormagnostus simplex–Glyptagnostus stolidotu

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18

Seitaj, Dorina, Regina Schauer, Fatimah Sulu-Gambari, et al. "Cable bacteria generate a firewall against euxinia in seasonally hypoxic basins." Proceedings of the National Academy of Sciences 112, no. 43 (2015): 13278–83. http://dx.doi.org/10.1073/pnas.1510152112.

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Seasonal oxygen depletion (hypoxia) in coastal bottom waters can lead to the release and persistence of free sulfide (euxinia), which is highly detrimental to marine life. Although coastal hypoxia is relatively common, reports of euxinia are less frequent, which suggests that certain environmental controls can delay the onset of euxinia. However, these controls and their prevalence are poorly understood. Here we present field observations from a seasonally hypoxic marine basin (Grevelingen, The Netherlands), which suggest that the activity of cable bacteria, a recently discovered group of sulf

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19

Archibald, Zofia Halina. "THE EUXINE SEA." Classical Review 50, no. 1 (2000): 237–39. http://dx.doi.org/10.1093/cr/50.1.237.

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20

Sokolovskaya, Yu G., E. D. Krasnova, D. A. Voronov, D. N. Matorin, A. A. Zhiltsova, and S. V. Patsaeva. "Optical Proxies of Euxinia: Spectroscopic Studies of CDOM, Chlorophyll, and Bacteriochlorophylls in the Lagoon on Zeleny Cape (the White Sea)." Photonics 10, no. 6 (2023): 672. http://dx.doi.org/10.3390/photonics10060672.

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Along the shoreline of the White Sea, due to the post-glacial uplift of the coast, some water bodies with stable stratification have been formed. They have been classified as meromictic as they are at different stages of isolation from the Sea. As separation progresses, significant changes occur in the water column, including the composition of chromophoric dissolved organic matter (CDOM) and the structure of the aquatic microbial community. In this work, we searched for optical proxies of euxinia (anoxic conditions with accumulated hydrogen sulfide) in the water column of the meromictic lagoo

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21

Kunert, Alexandra, Johnathan Clarke, and Brian Kendall. "Molybdenum Isotope Constraints on the Origin of Vanadium Hyper-Enrichments in Ediacaran–Phanerozoic Marine Mudrocks." Minerals 10, no. 12 (2020): 1075. http://dx.doi.org/10.3390/min10121075.

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Vanadium is an important redox-sensitive trace metal for paleoenvironmental reconstructions. Modern organic-rich sediments persistently contain sediment V enrichments <500 μg/g, but many ancient marine organic-rich mudrocks record enrichments >500 μg/g. Previous studies propose that ancient V enrichments of these magnitudes (“V hyper-enrichments”) were deposited from hyper-sulfidic bottom-waters with higher H2S levels (≥10 mM) than observed in modern euxinic basins. To test the importance of hyper-sulfidic conditions for generating V hyper-enrichments, we compare V concentrations with Mo

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22

Porter, Susannah M., and Leigh Anne Riedman. "Systematics of organic-walled microfossils from the ca. 780–740 Ma Chuar Group, Grand Canyon, Arizona." Journal of Paleontology 90, no. 5 (2016): 815–53. http://dx.doi.org/10.1017/jpa.2016.57.

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AbstractThe ca. 780–740 Ma Chuar Group, Grand Canyon, Arizona, provides an exceptional record of life during the diversification of crown-group eukaryotes, just prior to the first Cryogenian glaciation. We document in detail the assemblage of organic-walled microfossils preserved in fine-grained siliciclastics throughout the unit. In contrast with earlier studies, we primarily used SEM to document fossil morphologies, augmented by transmitted light microscopy, FIB-SEM, and TEM. This resulted in the discovery of new species and the recognition of broad-ranging, intraspecific biological and taph

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23

Sokolova, T. A., and O. Yu Ermolaeva. "Environmental assessment of vegetation of the spit and Tuzla island (Krasnodar Territory, Republic of the Crimea)." Plant Biology and Horticulture: theory, innovation, no. 149 (December 10, 2019): 165–76. http://dx.doi.org/10.36305/0201-7997-2019-149-165-176.

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In order to classify the vegetation, as well as its sozological assessment, based on the Brown-Blancke method, geobotanical descriptions of the vegetation of the spit and Tuzla island were carried out, rare species were noted, and a cartographic survey of the territory was carried out. As a result of five-year studies, the classification of vegetation of the spit and Tuzla island was made. 22 associations (2 new - Lactuco tataricae-Elaeagnetum angustifoliae and Gypsophiletum perfoliatae), 8 subassociations (6 new - Lactuco tataricae-Elaeagnetum angustifoliae juncetosum maritimae, L. t.-E. a.)

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24

Lenz, C., T. Jilbert, D. J. Conley, M. Wolthers, and C. P. Slomp. "Are recent changes in sediment manganese sequestration in the euxinic basins of the Baltic Sea linked to the expansion of hypoxia?" Biogeosciences 12, no. 16 (2015): 4875–94. http://dx.doi.org/10.5194/bg-12-4875-2015.

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Abstract. Expanding hypoxia in the Baltic Sea over the past century has led to the development of anoxic and sulfidic (euxinic) deep basins that are only periodically ventilated by inflows of oxygenated waters from the North Sea. In this study, we investigate the potential consequences of the expanding hypoxia for manganese (Mn) burial in the Baltic Sea using a combination of pore water and sediment analyses of dated sediment cores from eight locations. Diffusive fluxes of dissolved Mn from sediments to overlying waters at oxic, hypoxic and euxinic sites are consistent with an active release o

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25

Lenz, C., T. Jilbert, D. J. Conley, M. Wolthers, and C. P. Slomp. "Are recent changes in sediment manganese sequestration in the euxinic basins of the Baltic Sea linked to the expansion of hypoxia?" Biogeosciences Discussions 11, no. 6 (2014): 9889–918. http://dx.doi.org/10.5194/bgd-11-9889-2014.

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Abstract. Expanding hypoxia in the Baltic Sea over the past century has led to anoxic and sulfidic (euxinic) deep basins that are only periodically ventilated by inflows of oxygenated waters from the North Sea. In this study, we investigate the consequences of the expanding hypoxia for manganese (Mn) burial in the Baltic Sea using a combination of pore water and sediment analyses of well-dated sediment cores from 8 locations. Diffusive fluxes of dissolved Mn from sediments to overlying waters at oxic and hypoxic sites are in line with an active release of Mn from these areas. However, this flu

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26

Olteanu, Radu. "The “Cimpia Moment” (late Miocene, Romania) and the Pannonian-Pontian boundary, defined by ostracods." Journal of Micropalaeontology 8, no. 2 (1989): 239–47. http://dx.doi.org/10.1144/jm.8.2.239.

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Abstract. The boundary between the Pannonian and Pontian (late Miocene) of the Pannonian area is recognised on the basis of ostracod faunas. A comparison is made between the faunas of the Pannonian Basin and the Dacic-Euxine Basin. A transitional fauna with Pannonian elements, but a stronger Pontian component, is described from Cimpia (Romania). This indicates a more gradual transition between the two stages in the Pannonian Basin than in the Dacic-Euxine Basin, where there is a sharp faunal break indicating a period of non-deposition or erosion.

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27

Helz, George R., and Marvourneen K. Dolor. "What regulates rhenium deposition in euxinic basins?" Chemical Geology 304-305 (April 2012): 131–41. http://dx.doi.org/10.1016/j.chemgeo.2012.02.011.

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28

Scott, Clint, and Timothy W. Lyons. "Contrasting molybdenum cycling and isotopic properties in euxinic versus non-euxinic sediments and sedimentary rocks: Refining the paleoproxies." Chemical Geology 324-325 (September 2012): 19–27. http://dx.doi.org/10.1016/j.chemgeo.2012.05.012.

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29

Bura-Nakić, Elvira, Morten B. Andersen, Corey Archer, Gregory F. de Souza, Marija Marguš, and Derek Vance. "Coupled Mo-U abundances and isotopes in a small marine euxinic basin: Constraints on processes in euxinic basins." Geochimica et Cosmochimica Acta 222 (February 2018): 212–29. http://dx.doi.org/10.1016/j.gca.2017.10.023.

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30

Filatova, N. I. "Jurassic anoxic event in the Pacific (on the West Kamchatka-Asia data)." Доклады Академии наук 487, no. 5 (2019): 543–46. http://dx.doi.org/10.31857/s0869-56524875543-546.

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The correlation of allochthonous lithotectonic complexes of the Pacific allows to establish Early Jurassic (Sinemurian-Toarcian) anoxic event (J1-OAE) for time in the Asia-West Kamchatka region. This event is characterized by organic-riched black cherts and shales bearing pyrite that accumulated in the euxinic oceanic deep water basins of the Pacific. Later anoxic regime gradually weakened that was reflected in dominating of Midle-Upper Jurassic red gematite jaspers. J1-OAE in the Pacific was synchronous to global warming induced by planetary magmatic activity. Volcanic gases and hydroterms st

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31

Abraham, Mohd Al Farid, Bernhard David A. Naafs, Vittoria Lauretano, Fotis Sgouridis, and Richard D. Pancost. "Warming drove the expansion of marine anoxia in the equatorial Atlantic during the Cenomanian leading up to Oceanic Anoxic Event 2." Climate of the Past 19, no. 12 (2023): 2569–80. http://dx.doi.org/10.5194/cp-19-2569-2023.

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Abstract. Oceanic Anoxic Event 2 (OAE 2) (∼ 93.5 Ma) is characterized by widespread marine anoxia and elevated burial rates of organic matter. However, the factors that led to this widespread marine deoxygenation and the possible link with climatic change remain debated. Here, we report long-term biomarker records of water-column anoxia, water-column and photic zone euxinia (PZE), and sea surface temperature (SST) from Demerara Rise in the equatorial Atlantic that span 3.8 Myr of the late Cenomanian to Turonian, including OAE 2. We find that total organic carbon (TOC) content is high but varia

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32

Scholz, Florian, James McManus, and Stefan Sommer. "The manganese and iron shuttle in a modern euxinic basin and implications for molybdenum cycling at euxinic ocean margins." Chemical Geology 355 (September 2013): 56–68. http://dx.doi.org/10.1016/j.chemgeo.2013.07.006.

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33

Hedreen, Guy. "The Cult of Achilles in the Euxine." Hesperia 60, no. 3 (1991): 313. http://dx.doi.org/10.2307/148068.

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34

KLEPAC-CERAJ, V., C. A. HAYES, W. P. GILHOOLY, T. W. LYONS, R. KOLTER, and A. PEARSON. "Microbial diversity under extreme euxinia: Mahoney Lake, Canada." Geobiology 10, no. 3 (2012): 223–35. http://dx.doi.org/10.1111/j.1472-4669.2012.00317.x.

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35

Meyer, Katja M., and Lee R. Kump. "Oceanic Euxinia in Earth History: Causes and Consequences." Annual Review of Earth and Planetary Sciences 36, no. 1 (2008): 251–88. http://dx.doi.org/10.1146/annurev.earth.36.031207.124256.

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36

Helz, George R., Elvira Bura-Nakić, Nevenka Mikac, and Irena Ciglenečki. "New model for molybdenum behavior in euxinic waters." Chemical Geology 284, no. 3-4 (2011): 323–32. http://dx.doi.org/10.1016/j.chemgeo.2011.03.012.

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37

Stacey, Jack, Ashleigh v. S. Hood, and Malcolm W. Wallace. "Persistent late Tonian shallow marine anoxia and euxinia." Precambrian Research 397 (October 2023): 107207. http://dx.doi.org/10.1016/j.precamres.2023.107207.

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38

Rddad, Larbi. "Fixation and redistribution of arsenic during early and late diagenesis in the organic matter-rich members of the Lockatong Formation, Newark basin, USA: implication for the quality of groundwater." Atlantic Geology 53 (June 28, 2017): 253–68. http://dx.doi.org/10.4138/atlgeol.2017.010.

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The Byram and Walls Island members in the lower and upper sections, respectively, of the Lockatong Formation in the Newark basin near the border between Pennsylvania and New Jersey were chosen to assess (i) the role of euxinic/anoxic conditions in sequestering arsenic (As) and other trace elements and (ii) the redistribution of these elements during catagenetic transformations. ἀese members are rich in organic matter and host pyrite which occurs as disseminations, small patches, and subparallel veins. ἀe sulfur isotope values of pyrite samples range between -7.5 and 0.5 ‰CDT (average = -3.5‰CD

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39

Staubwasser, M., R. Schoenberg, F. von Blanckenburg, S. Krüger, and C. Pohl. "Isotope fractionation between dissolved and suspended particulate Fe in the oxic and anoxic water column of the Baltic Sea." Biogeosciences Discussions 9, no. 4 (2012): 4793–817. http://dx.doi.org/10.5194/bgd-9-4793-2012.

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Abstract. Fe isotope ratios and concentrations of dissolved Fe (Fedis, < 0.45 μm) and of suspended particulate Fe (FeSPM) from a depth profile in the Eastern Gotland Basin, Baltic Sea, show a sharp gradient in δ56Fedis across the suboxic interface with δ56Fedis = −0.4 ‰ in the euxinic deep basin and δ56Fedis = +0.3 ‰ in the oxic upper water column. The isotopic gradient overlaps with a strong concentration gradient of Fedis, a concentration maximum in FeSPM and lower δ56FeSPM values than δ56Fedis. These features indicate preferential loss of light Fe isotopes into suspended iron-oxyhydroxid

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40

ARSLAN, Murat. "Arrianus un Karadeniz Seyahati (Arriani Periplus Ponti Euxini)." LIBRI Kitap Tanitimi, Elestiri ve Ceviri Dergisi 1, no. 1 (2015): 93. http://dx.doi.org/10.20480/lbr.2015115472.

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41

Nadel, Benjamin. "The Euxine Pontos as seen by the Greeks." Dialogues d'histoire ancienne 17, no. 2 (1991): 115–26. http://dx.doi.org/10.3406/dha.1991.1940.

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42

Fox, Calum P., Jessica H. Whiteside, Paul E. Olsen, et al. "Two-pronged kill mechanism at the end-Triassic mass extinction." Geology 50, no. 4 (2022): 448–53. http://dx.doi.org/10.1130/g49560.1.

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Abstract High-resolution biomarker and compound-specific isotope distributions coupled with the degradation of calcareous fossil remnants reveal that intensive euxinia and decalcification (acidification) driven by Central Atlantic magmatic province (CAMP) activity formed a two-pronged kill mechanism at the end-Triassic mass extinction. In a newly proposed extinction interval for the basal Blue Lias Formation (Bristol Channel Basin, UK), biomarker distributions reveal an episode of persistent photic zone euxinia (PZE) that extended further upward into the surface waters. In the same interval, s

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43

Loevezijn, Gerard B. S. van, and J. G. M. Raven. "From carbonate platform to euxinic sea – the collapse of an Early/Middle Devonian reef, Cantabrian Mountains (Spain)." Geologos 23, no. 3 (2017): 143–61. http://dx.doi.org/10.1515/logos-2017-0018.

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AbstractThe Santa Lucía Formation represents the major phase in Devonian reef development of the Cantabrian Zone (Cantabrian Mountains, northwest Spain). In the present study the transition from the carbonate platform deposits of the Santa Lucía Formation to the overlying euxinic basinal deposits of the Huergas Formation is described. These transitional strata are connected to the Basal Choteč Event and represent a condensed sedimentation of micritic dark-grey and black limestones with an upward increase of dark shale intercalations with iron mineralisation surfaces and storm-induced brachiopo

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44

Slomp, Caroline P. "Reconstructing the history of euxinia in a coastal sea." Geology 41, no. 4 (2013): 523–24. http://dx.doi.org/10.1130/focus0420131.1.

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45

Grice, K. "Photic Zone Euxinia During the Permian-Triassic Superanoxic Event." Science 307, no. 5710 (2005): 706–9. http://dx.doi.org/10.1126/science.1104323.

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46

Barberán, Albert, and Emilio O. Casamayor. "Euxinic Freshwater Hypolimnia Promote Bacterial Endemicity in Continental Areas." Microbial Ecology 61, no. 2 (2010): 465–72. http://dx.doi.org/10.1007/s00248-010-9775-6.

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47

Wu, C., T. Yang, G. A. Shields, et al. "Termination of Cryogenian ironstone deposition by deep ocean euxinia." Geochemical Perspectives Letters 15 (July 2020): 1–5. http://dx.doi.org/10.7185/geochemlet.2025.

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48

Eckert, Sebastian, Hans-Jürgen Brumsack, Silke Severmann, Bernhard Schnetger, Christian März, and Henning Fröllje. "Establishment of euxinic conditions in the Holocene Black Sea." Geology 41, no. 4 (2013): 431–34. http://dx.doi.org/10.1130/g33826.1.

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49

Fulton, J. M., M. A. Arthur, B. Thomas, and K. H. Freeman. "Pigment carbon and nitrogen isotopic signatures in euxinic basins." Geobiology 16, no. 4 (2018): 429–45. http://dx.doi.org/10.1111/gbi.12285.

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50

Hubareva, E. S., and B. E. Anninsky. "Quantitative distribution and lipid reserves of the population of <i>Calanus euxinus</i> (Copepoda) in the Black Sea in late Autumn 2017." Okeanologiâ 64, no. 3 (2024): 462–72. https://doi.org/10.31857/s0030157424030074.

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Field data on abundance, biomass, age structure and lipid reserves of the population of copepod Сalanus euxinus in deep pelagial and Crimean shelf regions of the Black Sea in November 2017 were analyzed. Abundance and biomass of this species in deep areas (10.2 ± 0.5×103 ind/m2 and 7.3 ± 0.5 g/m–2, respectively) were close to the average annual values for the seasons with moderate development of planktivorous jellyfish populations. Mean abundance and biomass of the copepod were similar to the analogous values for 2016 when the abundance of medusae was twice lower. However, in 2017 the dense ag

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