Ons [5]. Leushina et al. [2] report the outcomes of geochemical research and
Ons [5]. Leushina et al. [2] report the outcomes of geochemical studies and reconstruction of paleosedimentation conditions of Upper Jurassic ower Cretaceous source rocks from the north of Western Siberia (Russia). The rocks are characterized by significant variations in total organic carbon content material and petroleum generation prospective of organic matter; the maturityGeosciences 2021, 11, 453. https://doi.org/10.3390/geoscienceshttps://www.mdpi.com/journal/geosciencesGeosciences 2021, 11,two ofis at the starting with the oil window. The authors integrate isotopic data with geochemical analyses to evaluate the genesis of the rocks in the peripheral a part of the Bazhenov Sea and reconstruct paleoenvironments that controlled the accumulation of organic matter in sediments, its composition, and diagenetic alterations. In accordance with the obtained data, the deposits on the Northern Bazhenov accumulated under marine conditions using a typically moderate and periodically increasing terrigenous influx. The variations in organic matter composition are determined by redox conditions and terrigenous input which correlate using the eustatic sea-level modifications during transgressive/regressive cycles and activation of currents. Transgression is associated with an intensive accumulation of organic matter beneath anoxic to euxinic circumstances and insignificant influence of terrigenous sources, resulting in the formation of rocks with oil-generating properties. For the duration of the regression periods, the terrigenous sedimentation enhanced along with the dissolved oxygen DMPO manufacturer concentration, and deposits with low organic matter content material and gas-generating properties were formed. Idrisova et al. [3] elaborate the outcomes of your above-mentioned study by focusing on the mineralogical, chemical, and isotopic characterization of pyrites from the rocks of the Bazhenov Formation (Upper Jurassic ower Cretaceous organic-rich shales, Western Siberia, Russia). Scanning electron microscopy reveals pyrites of different morphologies: tiny and big framboids, smaller crystals, and large euhedral crystals. Isotope ratio mass spectrometry and secondary ion mass spectrometry show isotopically light (34 SCDT varying from -55 to -20) modest framboids and microcrystalline pyrite, and isotopically heavy (34 SCDT as much as +26) substantial framboids and euhedral crystals of pyrite. The authors recommend the pyrite morphology and its sulfur isotope composition are controlled by the redox situations and sedimentation regime. The accumulation of sediments that occurred under anoxic circumstances hyperlinks for the Sutezolid Technical Information abundance of small framboids of pyrite, though the accumulation at suboxic circumstances, possibly inside the presence of oxygen, links towards the presence of your substantial framboids and euhedral crystals of pyrite. Yurchenko et al. [4] address the possible application of stable carbon and oxygen isotope composition of carbonates for the study in the organic-rich source rocks genesis on the example from the Upper Jurassic ower Cretaceous Bazhenov Formation (West Siberian Basin, Russia). The studied deposits are located in the central (one of the most productive) and peripheral (northern and southern) regions of the Bazhenov Formation distribution area, as an example in the distinct sedimentation conditions. The authors recognize key things influencing a steady isotope composition of carbonate minerals and establish its relation to the formation conditions. Working with a thermodynamic model of carbon and oxygen isotope exchange in the carbonate ater arb.