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Title

Detecting eustatic and tectonic signals with carbon isotopes in deep-marine strata, Eocene Ainsa Basin, Spanish Pyrenees

Authors
Clark, Julian D.
Puigdefàbregas, Cai
Dykstra, Mason L.
Fildani, Andrea
Published in Geology. 2017, no. G39068.1
Abstract We explore the potential of high-resolution carbon isotope stratig- raphy to provide an independent record of global sea-level changes in a 1600-m-thick succession representing ~5 m.y. of slope sedimentation in the Eocene Ainsa Basin of Spain. The restricted physiographic setting of the basin results in a bulk δ13Ccarb signal that accurately correlates with the coeval eustatic curve from the New Jersey (USA) passive mar- gin. We show that much of the deep-water sediment gravity ow (SGF) deposits are emplaced during eustatic lowstands and ne-grained marly intervals between SGFs correlate with rising and highstand sea levels. However, we also detect a substantial interval of SGF deposi- tion during a sea-level highstand, con rming the nonuniqueness of the controls on clastic deposition. This approach provides a new way to assess the origin of depositional sequences and improve stratigraphic predictions in basins with limited chronostratigraphic control.
Keywords C-13/C-12 carbonCenozoic chemostratigraphy deep-sea environmentDepositional environmentEoceneEurope eustasyIberian PeninsulaIsotope ratiosIsotopes marine environment
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Structures
Research group Earth Surface Dynamics
Project
Swiss National Science Foundation: 200021–146822
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CASTELLTORT, Sébastien et al. Detecting eustatic and tectonic signals with carbon isotopes in deep-marine strata, Eocene Ainsa Basin, Spanish Pyrenees. In: Geology, 2017, n° G39068.1. doi: 10.1130/G39068.1 https://archive-ouverte.unige.ch/unige:101524

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Deposited on : 2018-01-22

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