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A Triassic syndepositional detachment system, Ischigualasto Provincial Park, northwestern Argentina

Albrecht, Tony L.
http://rave.ohiolink.edu/etdc/view?acc_num=miami1123864956

Abstract Details

2005, Master of Science, Miami University, Geology and Environmental Earth Science.
The Ischigualasto basin of northwest Argentina contains ~4 km of non-marine strata. In the southeast part of the basin, the Middle Triassic Los Rastros Formation contains a ~1 km 2 area where rocks exhibit both extensional and contractional deformation features. To the east, both high angle and listric normal faults are the dominant structures. To the west, deformation consists of reverse and thrust faults, in addition to upright and overturned folds. Faults in both areas sole into a sub-horizontal detachment surface, below which rocks are undeformed. Deformed Los Rastros Formation strata are overlain by lightly-deformed/undeformed rocks of the Upper Triassic Ischigualasto Formation. The Agua de la Peña detachment system is interpreted to have formed as a result of gravity spreading/depositional loading of lacustrine delta platform and fluvial deposits above an overpressured shale décollement. Although 2-3 orders of magnitude smaller, the cross-sectional shape and interpreted driving mechanisms of the Agua de la Peña detachment are similar to paired extensional-contractional fault systems formed along continental margins. Based on reconstructed geometry and interpreted rheology, the contractional portion of the detachment can be modeled as a critical-tapered wedge, and provides a small-scale analogue for fold-thrust belts formed in passive-margin settings.
Brian Currie (Advisor)
56 p.
Geology
structural geology; extension; contraction; critical tapered wedge

Recommended Citations

Citations

  • Albrecht, T. L. (2005). A Triassic syndepositional detachment system, Ischigualasto Provincial Park, northwestern Argentina [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1123864956

    APA Style (7th edition)

  • Albrecht, Tony. A Triassic syndepositional detachment system, Ischigualasto Provincial Park, northwestern Argentina. 2005. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1123864956.

    MLA Style (8th edition)

  • Albrecht, Tony. "A Triassic syndepositional detachment system, Ischigualasto Provincial Park, northwestern Argentina." Master's thesis, Miami University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1123864956

    Chicago Manual of Style (17th edition)

miami1123864956
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© 2005, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.