Charreau, Julien and Avouac, Jean-Philippe and Chen, Yan and Dominguez, Stéphane and Gilder, Stuart (2008) Miocene to present kinematics of fault-bend folding across the Huerguosi anticline, northern Tianshan (China), derived from structural, seismic, and magnetostratigraphic data. Geology, 36 (11). pp. 871-874. ISSN 0091-7613 http://resolver.caltech.edu/CaltechAUTHORS:CHAg08
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We combine surface structural measurements, subsurface seismic imaging, and magnetostratigraphic 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 fi tting 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.
|Additional Information:||© 2008 Geological Society of America. Revised manuscript received 28 July 2008. Manuscript accepted 28 July 2008. We thank Ed Sobel and Amelia Hubert-Ferrari for helpful reviews. We are also grateful to Sebastien Leprince and Mathieu Daëron for fruitful discussions and help in the statistical analysis. This study was financed by the Institut National des Sciences de l'Univers French program ECLIPSE, the Agence National pour la Recherche, and the Gordon and Betty Moore Foundation. This is Caltech Tectonics Observatory contribution 89.|
|Group:||Caltech Tectonics Observatory, Caltech Tectonics Observatory. Indo-Asian Collision Zone|
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|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||10 Feb 2009 21:04|
|Last Modified:||26 Dec 2012 10:47|
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