Results 231 to 240 of about 8,217 (293)

High-resolution integrated conodont biostratigraphy and carbon isotope (δ13Ccarb) chemostratigraphy of the Ordovician of Sweden, with comparison to South China and North America

Geological Society of America Bulletin
Based on the new Kinnekulle-1 core from the classical Kinnekulle Table Mountain, this study provides an integrated high-resolution biostratigraphic and chemostratigraphic framework for the late Early through Late Ordovician of southern Sweden.
M. Calner, Anders Lindskog, Rongchang Wu, Guanzhou Yan, Christian M.Ø. Rasmussen, Oliver Lehnert, M. Joachimski   +6 more
semanticscholar   +1 more source

High-resolution chemostratigraphy and bulk mineralogical characterization of the Wilcox: A complimentary new multidisciplinary approach to enhanced stratigraphic correlation

Third International Meeting for Applied Geoscience & Energy Expanded Abstracts, 2023
Summary Presented within this study is an example of high resolution chemostratigraphic zonation of the Wilcox Group. Elemental data from Inductively Coupled Plasma - Optical Emission Spectrometer (ICP-OES) and Inductively Coupled Plasma - Mass ...
Tim J. Pearce, David Riley, Jesal Hirani, Neil Campion, E. Daneshvar, Gemma Hildred   +5 more
semanticscholar   +1 more source

Ediacaran δ13C chemostratigraphy of South China

Chemical Geology, 2007
Abstract We report new δ13C chemostratigraphic data of the Ediacaran System in South China. Using litho- and biostratigraphic markers as independent calibrators, we combine new and previously published δ13C data to construct a composite δ13C profile for the Ediacaran System in South China. The composite curve shows, in chronostratigraphic order, 1) a
Chuanming Zhou, Shuhai Xiao
openaire   +1 more source

Neoproterozoic marine chemostratigraphy, or eustatic sea level change?

Palaeogeography, Palaeoclimatology, Palaeoecology, 2021
Abstract Paleosols are characterized with new chemical and petrographic data from the Tonian (776–729 Ma) Chuar Group in the eastern Grand Canyon, Arizona. Paleosols have been discovered at 66 stratigraphic levels in a 1622 m sequence largely of marine shales and thin intertidal stromatolitic dolostones. A purple paleosol association includes gypsum “
Gregory J. Retallack, Adrian P. Broz, Larry S.-H. Lai, Kevin Gardner   +3 more
openaire   +1 more source

Chapter 4.4 Chemostratigraphy

2009
Abstract Carbon- and strontium-isotope data from the Mina Verdun, Arroyo del Soldado and Sierras Bayas groups are summarised and discussed. Mn/Sr ratios and δ 13 C versus δ 18 O crossplots for the Mina Verdun Group at its stratotype show that δ 13 C reflects seawater composition.
Claudio Gaucher, Alcides N. Sial, Daniel Poiré, Lucia Gómez Peral, Valderez P. Ferreira, Marcio M. Pimentel   +5 more
openaire   +1 more source

A global reference for black shale geochemistry and the T-OAE revisited: upper Pliensbachian – middle Toarcian (Lower Jurassic) chemostratigraphy in the Cleveland Basin, England

Geological Magazine
The Pliensbachian–Toarcian succession of North Yorkshire provides a global reference for the interval incorporating the Toarcian Oceanic Anoxic Event (T-OAE, ∼183 Ma). Major and trace element, carbon stable-isotope (δ13Corg) and total organic carbon (TOC)
Ian Jarvis, Elizabeth Atar, D. Gröcke, Liam G. Herringshaw, J. Trabucho-Alexandre   +4 more
semanticscholar   +1 more source

Chapter 4 Chemostratigraphy and the Neoproterozoic glaciations

Geological Society, London, Memoirs, 2011
Abstract Although the pre-glacial Proterozoic isotopic record is poorly constrained, it is apparent that the chemical and isotopic composition of the oceans began to change during the early to mid-Neoproterozoic and experienced considerable fluctuations alongside climatic instability during much of the subsequent Cryogenian and ...
Galen P. Halverson, Graham Shields-Zhou
openaire   +1 more source

EVALUATION OF CARBON ISOTOPIC CHEMOSTRATIGRAPHY OF THE CEDAR MOUNTAIN FORMATION OF UTAH

Geological Society of America Abstracts with Programs, 2022
The Lower Cretaceous rocks of Utah preserve the origin of a multitude of dinosaur taxa, spread of angiosperms on the North American continent, and evolution of marsupial and eutherian mammals.
C. Forster, M. Suarez, Amy Gottberg, G. Sharman, C. Suarez   +4 more
semanticscholar   +1 more source

Application of artificial neural networks to chemostratigraphy

Paleoceanography, 1996
Artificial neural networks, a branch of artificial intelligence, are computer systems formed by a number of simple, highly interconnected processing units that have the ability to learn a set of target vectors from a set of associated input signals. Neural networks learn by self‐adjusting a set of parameters, using some pertinent algorithm to minimize ...
Björn A. Malmgren, Ulf Nordlund
openaire   +1 more source

Chemostratigraphy of the Posidonia Black Shale, SW Germany

Chemical Geology, 2004
Abstract During the Toarcian, widespread deposition of organic-rich mudrocks (black shales) occurred across Europe, linked to a 3rd-order sea-level rise. We provide a high-resolution, multi-proxy chemostratigraphic study of the Dotternhausen sections in SW Germany embedded in a stratigraphic and palecological framework.
A Frimmel, W Oschmann, L Schwark
openaire   +2 more sources