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Miocene to present kinematics of fault-bend folding across the Huerguosi anticline, northern Tianshan (China), derived from structural, seismic, and magnetostratigraphic data

Abstract : We combine surface structural measurements, subsurface seismic imaging, and magneto-stratigraphic dating to retrieve, through geometric modeling, the detailed history of fold growth and sedimentation across the Huerguosi anticline, on the northern Tianshan piedmont, taking advantage of a beautifully exposed section of growth strata. The model assumes a fault-bend folding mechanism, consistent with subsurface fold geometry. The shortening history is obtained by least-squares fitting of the measured dip angles of the growth strata. The shortening rate across the anticline is shown to have been remarkably constant: it increased only slightly from 0.84 ± 0.04 mm/yr between 10 and 4 Ma to 1.14 ± 0.02 mm/yr over the past 4 m.y. This approach also allows correcting syntectonic sedimentation rates for the effect of the fold growth and shows that the sedimentation rates in the piggyback basin increased abruptly from ~0.4 to ~0.7 mm/yr ca. 4 Ma.
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https://hal-insu.archives-ouvertes.fr/insu-00338254
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Submitted on : Wednesday, November 12, 2008 - 2:17:29 PM
Last modification on : Monday, September 7, 2020 - 3:04:29 AM

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Julien Charreau, Jean-Philippe Avouac, Yan Chen, Stéphane Dominguez, Stuart Gilder. Miocene to present kinematics of fault-bend folding across the Huerguosi anticline, northern Tianshan (China), derived from structural, seismic, and magnetostratigraphic data. Geology, Geological Society of America, 2008, 36 (11), pp.871-874. ⟨10.1130/G25073A.1⟩. ⟨insu-00338254⟩

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