Results 141 to 150 of about 2,587 (213)

Lu–Hf Isotope Composition of Zircon and Magma Sources of the Vendian–Early Paleozoic Granitoids in Tuva (by the Example of the Kaa-Khem and East Tannu-Ola Batholiths)

, 2020
—We present results of geochemical and Sr–Nd isotope studies of rocks and of local dating and determination of the Lu–Hf isotope composition of zircons from late Vendian–early Cambrian and Cambrian–Ordovician intrusive associations (granitoids and ...
S. Rudnev, V. Malkovets, E. Belousova, O. Turkina, D. V. Semenova   +4 more
semanticscholar   +1 more source

Vendian Taseeva Group, Southwestern Margin of the Siberian Platform: Isotope, Geochemical, and Geochronological Data, Age, and Correlation

Russian Geology and Geophysics, 2020
—A high-amplitude negative δ13C anomaly (–11‰ V-PDB) has been found in the carbonate horizons of the Chistyakovka Formation of the Taseeva Group in the type sections of the southern Yenisei Ridge.
B. Kochnev, A. Proshenkin, B. Pokrovsky, E. Letnikova   +3 more
semanticscholar   +1 more source

YUDOMIAN (VENDIAN) OF THE TYPE LOCALITY

Russian Geology and Geophysics, 1994
With new data obtained, the Yudomian Series (the Siberian Vendian) is characterized more precisely and more comprehensively in its type locality (Bol. Aim R. basin and near the Yudoma R. mouth). The new data corroborate the Tommotian age of the most ancient layers of the Pestrotsvet Formation in the region, which overlap here the Yudomian deposits with
V. V. Khomentovsky, G. A. Karlova
openaire   +1 more source

Paleoecological feedback and the Vendian-Cambrian transition

Trends in Ecology & Evolution, 1988
The emergence of abundant skeletonized animals during the Vendian-Cambrian transition is seen by paleontologists as an 'explosion' when nearly all basic designs of invertebrate life appeared for the first time in the fossil record. Breakthroughs in trophic strategy, involving an increasing three-dimensionality in the benthic habitat and positive ...
openaire   +2 more sources

Origin and formation of methane in groundwater of glacial origin from the Cambrian-Vendian aquifer system in Estonia

Geochimica et Cosmochimica Acta, 2019
Groundwater in the Cambrian-Vendian aquifer system in Estonia is characterised by the most depleted isotopic composition known in Europe (δ18O down to −23‰).
V. Raidla, J. Pärn, S. Schloemer, W. Aeschbach, G. Czuppon, J. Ivask, Andres Marandi, Holar Sepp, R. Vaikmäe, K. Kirsimäe   +9 more
semanticscholar   +1 more source

Metameric features in the Vendian metazoans

Italian Journal of Zoology, 1998
Abstract Metamerism as the serial homology is widespread among the Vendian (Late Precambrian) metazoans. Prevalence of segmented forms among the Vendian Bilateria suggests that in many phylogenetic lineages of Metazoa the evolutionary development of the bilateral symmetry and metamerism were related processes.
openaire   +1 more source

Chemical Weathering Indexes: Implication for Paleoclimatic Reconstructions, with the Vendian–Lower Cambrian Section of Podolian Transnistria as Example

Lithology and mineral resources, 2023
A. Maslov, V. N. Podkovyrov
semanticscholar   +1 more source

Geochemistry of Upper Vendian and Lower Cambrian Clay Rocks in the Moscow Syneclise: Some Traditional and Modern Approaches

Lithology and mineral resources, 2023
A. Maslov, V. N. Podkovyrov
semanticscholar   +1 more source

Microfossils and Sedimentary Environments of the Zherba Basin: Upper Vendian of the Patom Highland of Siberia

Stratigraphy and geological correlation, 2023
N. G. Vorob’eva, P. Petrov
semanticscholar   +1 more source

Was Scotland a Vendian RRR junction?

Journal of the Geological Society, 1994
In Early Palaeozoic time northern Scotland occupied a 120° promontory between the Appalachian and Greenland Iapetus-facing margins of Laurentia. It is proposed that this originated at a triple rift (RRR) jundion between Laurentia and two other continents, possibly Baltica and West Gondwana.
openaire   +1 more source