The clay mineralogy of pyroclastic Nb(Ta)-Zr(Hf)-REE-Ga mineralization in Late Permian coal-bearing strata from eastern Yunnan Province; southwest China was investigated in this study. Samples from XW and LK drill holes in this area were analyzed using XRD (X-ray diffraction) and SEM (scanning electronic microscope). Results show that clay minerals in the Nb-Zr-REE-Ga mineralized samples are co...

Abstract. Carbonate shells and encrustations from lacustrine organisms provide proxy records of past environmental climatic changes. The carbon isotopic composition (δ13C) such carbonates depends on the δ13C dissolved inorganic (DIC). Their oxygen (δ18O) is controlled by δ18O lake water temperature during carbonate precipitation. Lake δ18O, in turn, reflects atmospheric precipitation catchment ...

Link for citation: Krutenko D.S., Isaev V.I., S.G. Density of hydrocarbons and deep heat flow the territory (southeast Western Siberia). Bulletin Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 7, рр. 148-163. In Rus. The relevance. According to ruling theory organic origin petroleum, geothermal regime is considered be main factor, which responsible realization potenti...

Branched glycerol monoalkyl tetraethers (brGMGTs) are membrane-spanning lipids which were initially identified in marine settings and have more recently been found peats lake sediments. In the latter settings, their abundance relative to that of branched dialkyl (brGDGTs) appears increase under warmer climate conditions. Furthermore, distribution bottom sediments from an altitudinal transect Ea...

Modern amphibians (lissamphibians) are highly sensitive indicators of environmental disturbance. As such, fossil lissamphibians are an excellent model for testing causal hypotheses of the Cretaceous-Paleogene mass extinction and secondary effects of Deccan volcanism and a bolide impact (e.g., acid rain). We quantitatively analyzed high-resolution temporal changes in diversity and community stru...

Rahmstorfet al [2004] , in their "critique" of Shaviv and Veizer [2003] , assert that the pro­ posed correlation between cosmic ray flux (CRF) and paleoclimate during the Phanerozoic does not "hold up under scrutiny" because its astrophysical background is based on "ques­ tionable assumptions" and circular reasoning, and because the meteoritic and terrestrial databases and statistics are manipu...

The Late Ordovician mass extinction was linked to climate cooling and glaciation of Gondwana during the terminal Ordovician Hirnantian Age (444.7–443.4 Ma). Extinction patterns have been well described for many marine taxa, but much less is known about marine microbial communities through this interval. To elucidate the structure of microbial communities in tropical marine basins through the La...