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2 results on '"coeval constraints"'

1. Improved U–Th dating of carbonates with high initial 230Th using stratigraphical and coevality constraints.

Author

Roy-Barman, Matthieu and Pons-Branchu, Edwige

Subjects
URANIUM-thorium dating, CARBONATES, CONSTRAINTS (Physics), SPELEOTHEMS, STRATIGRAPHIC geology, HYPOTHESIS
Abstract

With high precision measurements now achievable by MC-ICPMS, the uncertainty on the initial 230 Th content can be the major source of uncertainty for U–Th ages of carbonates. The initial 230 Th content is usually derived from the 232 Th content of the sample and the initial 230 Th/ 232 Th ratio calculated using isochron techniques or using stratigraphical constraints along the speleothem growth axis. These two methods are based on different hypotheses and have not been couple previously. Here, we present a new algorithm called STRUTages that combines stratigraphical and coevality constraints in order to obtain the best estimate on the initial 230 Th/ 232 Th ratio of each sample. STRUTages and isochron results are compared on a suite of speleothems and a coral core. Comparison of the U–Th and growth-band counted ages of the coral core demonstrates the validity of the STRUTages approach. An Octave (Matlab-compatible) script allowing the use of stratigraphical and coevality constraints is provided. [ABSTRACT FROM AUTHOR]

Published
2016
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2. Improved U–Th dating of carbonates with high initial 230Th using stratigraphical and coevality constraints

Author

Matthieu Roy-Barman, Edwige Pons-Branchu, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Géochimie Des Impacts (GEDI), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Géochrononologie Traceurs Archéométrie (GEOTRAC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)

Subjects
Isochron, U-Th dating, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, 010506 paleontology, geography, geography.geographical_feature_category, Stratigraphy, STRUTages, Speleothem, Geology, 010502 geochemistry & geophysics, 01 natural sciences, Panoply, Paleontology, Earth and Planetary Sciences (miscellaneous), isochron, stratigraphical, coeval constraints, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, coral, speleothem, 0105 earth and related environmental sciences
Abstract

International audience; With high precision measurements now achievable by MC-ICPMS, the uncertainty on the initial 230 Th content can be the major source of uncertainty for U-Th ages of carbonates. The initial 230 Th content is usually derived from the 232 Th content of the sample and the initial 230 Th/ 232 Th ratio calculated using isochron techniques or using stratigraphical constraints along the speleothem growth axis. These two methods are based on different hypotheses and have not been couple previously. Here, we present a new algorithm called STRUTages that combines stratigraphical and coevality constraints in order to obtain the best estimate on the initial 230 Th/ 232 Th ratio of each sample. STRUTages and isochron results are compared on a suite of speleothems and a coral core. Comparison of the U-Th and growth-band counted ages of the coral core demonstrates the validity of the STRUTages approach. An Octave (Matlabcompatible) script allowing the use of stratigraphical and coevality constraints is provided.

Published
2016
Full Text
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