Results 111 to 120 of about 2,385 (155)

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
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A quantitative procedure for chemostratigraphy

Stratigraphy, 2004
A method for condensing a sequence of geochemical determinations into a set of vector-lengths for plotting is proposed. Data from the eastern Chinese non-marine Upper Cretaceous are used for exemplifying the procedure. The effect of reducing the dimensionality by deleting minor elements is illustrated.
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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
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ChemCam: Chemostratigraphy by the First Mars Microprobe

Elements, 2015
The ChemCam laser-induced breakdown spectrometer on the rover Curiosity has provided more than 200,000 spectra from over 5000 different locations on Mars. This instrument is the first chemical microprobe on Mars and has an analytical footprint 0.3–0.6 mm in diameter.
Wiens, R. C., Maurice, S. and the MSL Science Team, DLR Collaborator (MSL Science Team), Reitz G.   +2 more
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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
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Chemostratigraphy of Deep Water Silts and Shales

2004
Abstract Stratigraphic correlation of deep water siliciclastic sequences generally is based on biostratigraphic, palynological, and lithologic markers. However, in sequences that are barren of, or have limited fossil assemblages along with inconclusive lithologic correlation, the chemical composition of the silts and shales in the ...
Erik Scott, Arnold H. Bouma
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Possibilities and limitations of isotopic chemostratigraphy

Lithology and Mineral Resources, 2009
Postsedimentary transformations of rocks impede the use of isotopic methods for the paleoecological reconstruction and correlation of geological events. This fact was demonstrated previously based on the study of Neoproterozoic-Cambrian rocks (Vinogradov, 2008). Detailed analysis of literature material shows that the younger (Paleozoic) rocks were also
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Applications of Wellsite Chemostratigraphy

2018
Chemostratigraphy was first used at wellsite in the early 2000s but it is rather unfortunate that very little material has been published on the subject, with most articles taking the form of very short papers or conference abstracts. In spite of this, wellsite chemostratigraphy is becoming increasingly popular, as it can be used to provide lithology ...
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Chemostratigraphy across the Permian-Triassic Boundary

2018
A major extinction pulse occurred just below the conodont‐defined Permian‐Triassic boundary. Global‐scale compilations of increasingly larger paleontological, sedimentological, and geochemical datasets further amplify our understanding of this event by unraveling temporospatial patterns.
Schobben, Martin, Heuer, Franziska, Tietje, Melanie, Ghaderi, Abbas, Korn, Dieter, Korte, Christoph, Wignall, Paul B.   +6 more
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Chemostratigraphy of the Neoproterozoic Alona Bay lavas, Ontario

Canadian Journal of Earth Sciences, 2002
A basal sequence of flood basalt lavas associated with the Neoproterozoic Midcontinent rift system crops out in Alona Bay along the southeastern shore of Lake Superior in Ontario. The Alona Bay lava succession is about 1200 m thick and lies just north of the well-studied, contemporaneous Mamainse Point Formation.
James A Walker, Todd T Gmitro, Jonathan H Berg   +2 more
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