Results 61 to 70 of about 2,385 (155)
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
Geobiology, Volume 24, Issue 5, September/October 2026.ABSTRACT Following the largest known Phanerozoic extinction, the end‐Permian mass extinction, the Early Triassic is often considered an interval of slow biotic recovery. During this time, the minor Smithian‐Spathian extinction occurred, further delaying the biotic recovery of this epoch.
Sean M. Newby +3 more
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
Local and Global Controls on Carbon Isotope Chemostratigraphy
, 2022 Over million-year timescales, the geologic cycling of carbon controls long-term climate and the oxidation of Earth's surface. Inferences about the carbon cycle can be made from time series of carbon isotopic ratios measured from sedimentary rocks. The foundational assumption for carbon isotope chemostratigraphy is that carbon isotope values reflect ...
Anne-Sofie Ahm, Jon Husson
openaire +1 more source
Chemostratigraphic analyses of legacy and late Holocene, presettlement deposits, Upper Stick Elliott Creek, North Carolina [PDF]
, 2020 Chemostratigraphy is a technique that defines and spatially correlates stratigraphic units using subtle variations in the elemental composition of the sediments.
NC DOCKS at Western Carolina University +1 more
core
, 1998 Metals such as Pb, Zn, Cd and Cu from historical mining activity have been used as stratigraphic markers for dating and provenancing vertically accreted, fine-grained floodplain overbank deposits.
K. A. Hudson-Edwards (17209525) +3 more
core +5 more sources
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
Boreas, Volume 55, Issue 3, Page 717-750, July 2026.Map of Lower sediment (LS) thickness is a surrogate for the distribution of Thorncliffe Formation (TF) and ~75% of TF thickness from the slope of Niagara Escarpment east to Brighton. Inset images show the LS sequence at the Don Valleys brickyards (DVBY) and undeformed TF sand and gravel (~15 m) below Newmarket Till (NT) at sites L and Co.
David R. Sharpe +3 more
wiley +1 more source
Chemostratigraphy in southern Ontario by pXRF spectrometry
, 2017 For groundwater studies, the collection of sediment geochemistry is often beyond the scope, and budget of many programs, and is generally not included as part of routine data collection. Portable x-ray fluorescence spectrometer (pXRF) has proven to be a successful tool to characterize the chemostratigraphy of glacial derived materials collected from ...
R Knight, H A J Russell, F Bajc
openaire +1 more source