-
Article
Lithology and Sedimentation Conditions of the Latest Cretaceous in the Klementyev Mountain Section (Eastern Crimea)
A comprehensive study of the Maastrichtian–Danian boundary rocks in the Klementyev Mountain section (eastern Crimea) was carried out. The lithological characteristics of carbonate, carbonate–clayey, and clasti...
-
Article
С, О, S, and Sr Isotopes in Rocks of the Lower Eifelian Osveya Horizon in Belarus
Complex interpretation of the distribution of δ13C and δ18О values in carbonates, as well as δ34S and 87Sr/86Sr values, in gypsum from the lower Eifelian Osveya horizon (Belarus) showed that significance of the d...
-
Article
Early Ediacaran Positive C-Isotope Anomaly in Limestones of the Chernaya Rechka Formation, Igarka Uplift (Northwestern Siberian Platform)
The Precambrian Chernaya Rechka Formation (Igarka Uplift) hosts a high-amplitude positive carbonate carbon and dispersed organic matter δ13С isotope anomaly (up to +12.4‰) spanning over 500 m of the section. Vari...
-
Article
C and O Isotope Composition of the Neoproterozoic Pre-, Syn-, and Postglacial Carbonates: Evidence from the Longdor Uplift and Western Slope of the Aldan Shield, Southern Siberian Platform
New data on the C and O isotope composition in the Neoproterozoic carbonates of the Ballaganakh and Dal’nyaya Taiga regional stages (southeastern margin of the Patom paleobasin (hereafter, Basin) are presented...
-
Article
The С–О–Sr–S Isotope Geochemistry and Chemostratigraphic Correlation of Ordovician Deposits in the Vilyui Structural-Facies Zone, Siberian Platform
The C–O–Sr isotope composition of carbonates and the S–Sr isotope composition of gypsum were studied in the Ordovician section and the Upper Cambrian–Lower Silurian boundary horizons of the Vilyui structural-f...
-
Article
Late Cenomanian Paleoecological Event OAE 2 in the Sections of the Northern Peri-Tethys (Crimea, Eastern Caucasus): Sediment Structure and Dynamics of their Accumulation
The comparative characteristics of sedimentary successions corresponding to the paleoecological event OAE 2, which are spaced over 1000 km apart within the Crimean–Caucasian region, are present. It is shown th...
-
Article
C, O, and Sr Isotope Geochemistry of the Vendian Shuram–Wonoka Anomaly and Associated Metasedimentary Rocks in the Inner Part of the Patom Upland (Central Siberia)
The Imnyakh Formation (1500–1800 m thick), which is developed east of the Mama–Bodaibo Synclinorium (inner zone of the Patom Upland), comprises crystalline limestones (marbles) and carbonate shales (metamorphi...
-
Article
Open AccessNew Data on Stratigraphy and Distributions of Glendonites from the Carolinefjellet Formation (Middle Aptian–Lower Albian, Cretaceous), Western Spitsbergen
The Aptian deposits on Spitsbergen Island are poorly studied. Moreover, there were no published data on fossil distribution in the Aptian and Albian in the vicinity of the town of Longyearbyen. This article pr...
-
Article
New Sedimentological, Magnetostratigraphic, and Biostratigraphic Data on the Campanian–Maastrichtian of Beshkosh Mountain, Southwest Crimea
An integrated study of the Campanian–Maastrichtian deposits of Beshkosh Mountain (Southwest Crimea) was carried out. The finds of cephalopods and dinocysts were studied, and ichnofacies and sedimentological an...
-
Article
Methane with Abnormally High δ13C and δD Values from the Coastal Hot Springs in Lake Baikal
We studied the composition and isotopic characteristics (δ13C and δD) of hydrocarbon gases from the Kotelnikovsky, Zmeiny, and Goryachnisky hot springs located in the coastal zone of Lake Baikal. Of greatest inte...
-
Article
Nitrogen and Carbon Isotope Composition of Gases in High- \({{p}_{{{\text{C}}{{{\text{O}}}_{{\text{2}}}}}}}\) Waters in the North Caucasus
The paper presents the first data on the nitrogen isotope composition of the associated gases of mineral waters in the North Caucasus and newly acquired data on the carbon isotope composition of the CO2 and CH4. ...
-
Article
The C, O, and Sr Isotope Chemostratigraphy of the Vendian (Ediacaran)–Cambrian Transition, Olekma River, Western Slope of the Aldan Shield
The Upper Neoproterozoic–Lower Cambrian section in the Olekma River basin is divided (from bottom to top) into the Dikimdia, Seralakh, Porokhtakh, and Pestrotsvetnaya formations, which are mainly composed of d...
-
Article
Strontium Isotopic Composition in Carbonate from Breccias of Mud Volcanoes of Azerbaijan
In 13 out of 14 samples of carbonate xenoliths from mud volcanic breccias of Azerbaijan, the 87Sr/86Sr values (0.70675–0.70823, 87Sr/86Srmd = 0.7073 ± 0.0005) are within the same limits as in the volcanic waters ...
-
Article
Carbon Isotope Evidence of Methanogenesis in Sediments of the Dal’nyaya Taiga Group (Lower Vendian of the Patom Basin, Siberia)
The results of lithological, petrographic, and C–O isotope studies of various types of the diagenetic and postdiagenetic carbonate cement in silty mudstones, as well as coeval limestones, in postglacial deposi...
-
Article
Carbon and Oxygen Isotopes and Formation Conditions of the Upper Famennian Shale-Bearing Rocks in the Pripyat Trough, Southern Belarus
The behavior of stable carbon and oxygen isotopes in carbonates during the deposition and diagenesis of sediments in the bioproductive Upper Famennian Pripyat Trough (southern Belarus) is discussed. Limestones...
-
Article
Cretaceous–Paleogene Boundary in the Sequences of the Northeastern Caucasus, Dagestan: Sedimentology, Geochemistry, and Biota
The results of integrated study of the Cretaceous/Paleogene transition in the northeastern Caucasus are reported. The lithological, geochemical and micropaleontological characteristics of the sediments from tw...
-
Article
Isotope Characteristics (δ13C, δ18O) of Continental Carbonates from Permian‒Triassic Rocks in the Northeastern Russian Plate: Paleoclimatic and Biotic Reasons and Chemostratigraphy
Carbon and oxygen isotope compositions were determined in the pedogenic, sedimentary, and organogenic carbonates from Upper Permian (Vyatkian Stage) and Lower Triassic (Induan Stage) continental rocks in the n...
-
Article
Strontium Isotope Composition of Mud Volcanic Waters in Azerbaijan
The Sr isotope composition was studied in waters from 22 mud volcanoes in Azerbaijan, where the O and H isotope compositions, as well as concentrations of macro- and microelements, were determined earlier in (...
-
Article
C and Sr Isotope Chemostratigraphy and Pb–Pb Age of Carbonate Deposits of the Vorogovka Group (Neoproterozoic), Northwest of the Yenisei Range
The C and Sr isotopic signatures and the Pb–Pb age of carbonate sedimentary rocks of the Vorogovka Group in the reference section in the Vorogovka River valley, northwestern Yenisei Range, were obtained. The d...
-
Article
Geochemical and Isotope Characteristics of Carbonates from Ejecta of Mud Volcanoes of the Kura Basin, Azerbaijan
This paper is devoted to the vein and dispersed carbonates from ejecta of mud volcanoes of Azerbaijan. The vein calcites are morphologically diverse and related to the healing of fracture systems. Most of them...
