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Deep groundwater samples from the Continental Intercalaire CI aquifer in the Northern Tunisian Sahara have been analyzed for noble gases 3 He, 4 He, Ne and 81 Kr, and for 14 C to better constrain the groundwater residence time of this large transboundary aquifer. Its significant radiogenic 4 He content and background-level 14 C both indicate water older than a few tens of thousands of years.

Here, this study exemplifies the utility of 81 Kr not only as an independent and conservative chronometer, but also as a supplemental measurement to better calibrate the parameters required for other age tracers, including cosmogenic 36 Cl and radiogenic 4 He.

Deep groundwater samples from the Continental Intercalaire (CI) The results of 81Kr dating and the recalibrated 36Cl dating define an.

Intellectual merit. Continental and oceanic basaltic extrusive rocks are the most common volcanic rock types on the earth’s surface and their temporal and spatial evolution are critical for the understanding of plate tectonics, mantle melting processes, paleomagnetism, continental flood basalt provinces, etc. At the same time, basaltic rocks, especially when aphanitic and altered, are often difficult to date.

Magnetite Fe3O4 is found in nearly all types of extrusive rocks and common in basaltic to intermediate volcanic rock types. We anticipate that this approach and results from the proposed case studies should be of significant interest to a large and diverse portion of the geosciences community interested in the continental and oceanic realm. This project will rigorously develop and calibrate the dating of magnetite and explore its geological application to both continental and oceanic basaltic rocks.

Broader impacts. This will represent a considerable methodological advance and will offer a new technique for other scientists to utilize. The study will support a female graduate research assistant and involve an undergraduate student in some aspects of the research. The project will involve collaboration between the Kansas U. This diversity initiative encourages minority students to pursue undergraduate summer research and graduate work.

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This study showed varying sedimentation rates in coastal and distant sediment cores. Both Pb and Cs dating techniques showed comparable sedimentation rate in most sediment cores. This is a preview of subscription content, log in to check access.

The Triassic successions of western Argentina commonly show thin pyroclastic levels intercalated within thick fluvial and lacustrine terrigenous deposits.

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Garber, Joshua M. Fast subduction, slow exhumation: dating continental subduction beneath the Oman ophiolite. Continent subduction beneath continental upper plates has occurred at a broad range of rates that correlate with the size of the subducted fragment: small slivers subduct and exhume fast and cold while larger fragments undergo much slower and hotter orogenesis Kylander-Clark et al.

New dates from multiple lithologies in the As Sifah unit show that 1 previously published Sm-Nd dates are likely inaccurate and 2 multi-grain U-Pb zircon TIMS dates may be averages of long-term metamorphism. The duration of HP metamorphism is similar to other continental fragments subducted beneath ophiolites e. Our data show that As Sifah behaved as a small continental sliver during subduction yet like a larger continental body during exhumation — consistent with subduction of extended continental crust followed by thickening.

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Fast subduction, slow exhumation: dating continental subduction beneath the Oman ophiolite

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Quaternary Geochronology

The Neogene succession of the Aktau Mountains in the Ili Basin, southeast Kazakhstan, is a terrestrial archive well suited for researching the role of Central Asia in Miocene climate evolution. We present an integrated approach for dating the well-exposed Bastau Formation, based on magnetostratigraphy and constraints from cyclostratigraphy and biostratigraphy.

Stepwise demagnetization yielded characteristic remanence directions that are consistent with those expected for the Miocene in Central Asia. The reddish-colored alluvial floodplain deposits and gray lacustrine deposits show partly complex magnetic behavior with magnetite and hematite as the main magnetic carriers, with variable demagnetization behavior and non-dipolar normal and reverse polarity directions.

Data for: A multi-dating approach to age-modelling long continental records: the ka El Cañizar de Villarquemado sequence (NE Spain). Blas Lorenzo.

Lebatard A. Earth and Planetary Science Letters , , ISSN X. Demander le PDF. Site de la documentation. Consulter l’aide en ligne. S’abonner au flux RSS. Montpellier centre IRD. Montpellier MSE. La Paz.

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