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Using ⁸⁷Sr/⁸⁶Sr Ratios to Date Fossil Methane Seep Deposits: Methodological Requirements and an Example from the Great Valley Group, California

Kiel, Steffen ; Hansen, Christian ; Nitzsche, Kai Nils ; Hansen, Bent T. (2022)
Using ⁸⁷Sr/⁸⁶Sr Ratios to Date Fossil Methane Seep Deposits: Methodological Requirements and an Example from the Great Valley Group, California.
In: The Journal of Geology, 2014, 122 (4)
doi: 10.26083/tuprints-00022855
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Item Type: Article
Type of entry: Secondary publication
Title: Using ⁸⁷Sr/⁸⁶Sr Ratios to Date Fossil Methane Seep Deposits: Methodological Requirements and an Example from the Great Valley Group, California
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2014
Publisher: University of Chicago Press
Journal or Publication Title: The Journal of Geology
Volume of the journal: 122
Issue Number: 4
DOI: 10.26083/tuprints-00022855
Corresponding Links:
Origin: Secondary publication service
Abstract:

Methane seep carbonates preserve information about the history of methane seepage and of the fauna inhabiting these ecosystems. For this information to be useful, a reliable determination of the carbonates’ stratigraphic ages is required, but this is not always available. Here we investigate the using strontium isotope stratigraphy to date fossil methane seep carbonates via detailed petrographic and geochemical investigation of the different carbonate phases in biostratigraphically well-dated seep carbonates of Paleozoic, Mesozoic, and Cenozoic age. The best results are obtained from banded, botryoidal rim cements from carbonate phases showing a weak or no cathodoluminescence signal, an oxygen isotope signature close to that of seawater, and the lowest Mn concentrations. We then applied the method to a presumably late Jurassic seep carbonate from the Great Valley Group in California. Strontium isotope ratios of the least diagenetically altered carbonate phases indicate a Tithonian (late Jurassic) age for this seep site, which is in conflict with a recent study that suggested the absence of Jurassic strata from the Great Valley Group.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-228551
Classification DDC: 500 Science and mathematics > 550 Earth sciences and geology
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Department of Soil Mineralogy and Soil Chemistry
Date Deposited: 11 Nov 2022 13:16
Last Modified: 09 May 2023 11:36
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22855
PPN: 507604466
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