Results 61 to 70 of about 1,853 (212)
Hirnantian Isotope Carbon Excursion in Gorny Altai, southwestern Siberia [PDF]
Estonian Journal of Earth Sciences, 2015 The Hirnantian Isotope Carbon Excursion (HICE), a glaciation-induced positive δ13C shift in the end-Ordovician successions, has been widely used in chemostratigraphic correlation of the Ordovician–Silurian boundary beds in many areas of the world ...
Nikolay V. Sennikov +2 more
doaj +1 more source
Anais da Academia Brasileira de Ciências, 2005 C-isotope and 87Sr/86Sr values for five carbonate successions from the São Caetano Complex, northeastern Brazil, were used to constrain their depositional age and to determine large variations in the C- and Sr-isotopic composition of seawater under the ...
Juan C. Silva +3 more
doaj +1 more source
The Depositional Record, Volume 12, Issue 4, September 2026.An integrated facies, MS and XRF‐based approach applied to the Tithonian–Berriasian Sidi Khalif Formation (central Tunisia) resolves five Tithonian and eight Berriasian third‐order sequences, showing how mixed carbonate–siliciclastic shelves record coupled eustatic, climatic and tectonic controls and providing a transferable template for similar mud ...
Hamdi Omar, Adnene Lafi, Chokri Yaich
wiley +1 more source
High‐Resolution Anisian Marine Perturbation by Volcanism in the Eastern Paleo‐Tethys
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.Abstract Following the end‐Permian mass extinction, the Middle Triassic Anisian Stage was still characterized by environmental perturbations that hindered biological flourishing, yet it remains uncertain whether these persistent Tethyan disturbances were coupled with the closure of the Paleo‐Tethys Ocean.
Zhenyang Lai +12 more
wiley +1 more source
Early Neoproterozoic limestones from the Gwna Group, Anglesey [PDF]
, 2010 Limestone megaclasts up to hundreds of metres in size are present within the Gwna Group mélange, North Wales, UK. The mélange has been interpreted as part of a Peri-Gondwanan fore-arc accretionary complex although the age of deposition remains ...
JANA M. HORÁK +3 more
core +1 more source
Frontiers in Earth Science, 2019 Detailed characterization of variations in sediment architecture, flux, and transport processes in peri-orogenic basins offers insights into external climatic or tectonic forcings.
Julian Hülscher +4 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.Abstract The Cretaceous/Paleogene (K/Pg) Chicxulub impact produced globally synchronous enrichments of highly siderophile elements (HSEs) and a pronounced decline in marine osmium isotope ratios (187Os/188Os), forming a key geochemical marker of the boundary.
Honami Sato +6 more
wiley +1 more source
Chemostratigraphy, petrography, and SEM investigations of the Lower Triassic Montney Formation in Alberta: implications for a new and revised diagenetic and depositional model [PDF]
, 2018 High resolution chemostratigraphy of the Montney Formation across Alberta identifies three unique and distinct chemostratigraphic units, referred to as CS1-3, with several subunits (i.e. CS1a, lb, 3a, 3b).
Tu, Sam +5 more
core
Trans-Atlantic application of the Baltic Middle and Upper Ordovician carbon isotope zonation [PDF]
Estonian Journal of Earth Sciences, 2015 Application of the recently introduced Baltic d13C isotope zonation to a composite North American Darriwilian through Hirnantian succession shows that in most intervals there is good trans-Atlantic agreement not only between the isotope zones but also ...
Stig M. Bergström +4 more
doaj +1 more source
Journal of the Geological Society, 2002 Current chemostratigraphical studies of the Jurassic System primarily involve the use of one sedimentary component (marine organic carbon), one divalent transition metal substituted in carbonate (manganese), and two isotopic tracers: strontium-isotope ratios ( 87 Sr/ 86 Sr) and carbon-isotope
Jenkyns, H +4 more
openaire +2 more sources