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Intrabasinal sediment recycling from detrital strontium isotope stratigraphy

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dc.contributor.authorAuchter, Neal C.en
dc.contributor.authorRomans, Brian W.en
dc.contributor.authorHubbard, Stephen M.en
dc.contributor.authorDaniels, Benjamin G.en
dc.contributor.authorScher, Howie D.en
dc.contributor.authorBuckley, Wayneen
dc.contributor.departmentGeosciencesen
dc.date.accessioned2020-12-07T19:34:45Zen
dc.date.available2020-12-07T19:34:45Zen
dc.date.issued2020-10en
dc.description.abstractTemporary storage of sediment between source and sink can hinder reconstruction of climate and/or tectonic signals from stratigraphy by mixing of sediment tracers with diagnostic geochemical or geochronological signatures. Constraining the occurrence and timing of intrabasinal sediment recycling has been challenging because widely used detrital geothermochronology applications do not record shallow burial and subsequent reworking. Here, we apply strontium isotope stratigraphy techniques to recycled marine shell material in slope deposits of the Upper Cretaceous Tres Pasos Formation, Magallanes Basin, Chile. Detrital Sr-87/Sr-86 ages from 94 samples show that the majority (>85%) of the shells are >1-12 m.y. older than independently constrained depositional ages. We interpret the gap between mineralization age (Sr-87/Sr-86 age) and depositional age of host strata to represent the intrabasinal residence time of sediment storage at the million-year time scale. We also use specimen type to infer relative position of intrabasinal source material along the depositional profile, where oysters represent shallow-water (i.e., proximal) sources and inoceramids represent deeper-water (i.e., distal) sources. The combined use of detrital strontium isotope ages and specimen types from linked depositional segments provides an opportunity to identify and quantify sediment storage and recycling in ancient source-to-sink systems.en
dc.description.notesThe funding for this work was generously provided by the sponsors of the Chile Slope Systems (CSS) Joint Industry Project (BHP Billiton, Chevron, ConocoPhillips, Equinor, Hess, CNOOC, Repsol, and Shell). We are grateful to landowners for granting access to outcrops. We thank the many CSS members and friends for assistance in collecting samples. We are grateful for reviews from Tim Lawton, Tomas Capaldi, Kurt Sundell, and an anonymous reviewer.en
dc.description.sponsorshipChile Slope Systems (CSS) Joint Industry Project (BHP Billiton); Chevron; ConocoPhillips; Equinor; Hess; CNOOC; Repsol; ShellRoyal Dutch Shellen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1130/G47594.1en
dc.identifier.eissn1943-2682en
dc.identifier.issn0091-7613en
dc.identifier.issue10en
dc.identifier.urihttp://hdl.handle.net/10919/101033en
dc.identifier.volume48en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleIntrabasinal sediment recycling from detrital strontium isotope stratigraphyen
dc.title.serialGeologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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