Kinematics of Mass Transport Deposits revealed by magnetic fabrics

Geophysical Research Letters - Tập 44 Số 15 - Trang 7743-7749 - 2017
R. Weinberger1,2, T. Levi2, G.I. Alsop3, Shmuel Marco4
1Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
2Geological Survey of Israel, Jerusalem, Israel
3Department of Geology and Petroleum Geology, School of Geosciences, University of Aberdeen, Aberdeen, UK
4Department of Geophysics, School of Geosciences, Tel Aviv University, Tel Aviv, Israel

Tóm tắt

AbstractThe internal deformation and movement directions of Mass Transport Deposits (MTDs) are key factors in understanding the kinematics and dynamics of their emplacement. Although these are relatively easy to recover from well‐bedded sediments, they are more difficult to deduce from massive beds without visible strain markers. In order to test the applicability of using anisotropy of magnetic susceptibility (AMS) to determine MTD movement, we compare AMS fabrics, with structural measurements of visible kinematic indicators. Our case study involves the structural analysis of slumped lake sediments extensively exposed in MTDs within the Dead Sea Basin. Structural analyses of MTDs outcropping for >100 km reveal radial transport directions toward the basin depocenter. We show that the AMS fabrics display the same transport directions as inferred from structural analyses. Based on this similarity, we outline a robust procedure to obtain the transport direction of slumped MTDs from AMS fabrics. Variations in the magnetic fabrics and anisotropies in fold‐thrust systems within the slumps match the various structural domains. We therefore suggest that magnetic fabrics and anisotropy variations in drill cores may reflect internal deformation within the slumps rather than different slumps. Obtaining magnetic fabrics from MTDs provides a viable way to infer the transport directions and internal deformation of MTDs and reconstruct the basin depocenter in ancient settings. The present results also have implications beyond the kinematics of MTDs, as their geometry resembles fold‐thrust systems in other geological settings, scales, and tectonic environments.

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Geophysical Research Letters

Tập 44 Số 15

7743-7749

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