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Geomorphic response to transpression and alluvial fan chronology of the Mecca Hills, : a case study along the Southern southern San Andreas fault zone.

Gray, Harrison J
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1380613207

Abstract Details

2013, MS, University of Cincinnati, Arts and Sciences: Geology.
Geomorphic analysis was undertaken to better understand the landscape evolution of the Mecca Hills, a zone of transpressional uplift along the southern end of the San Andreas fault, in southern California.Terrestrial cosmogenic nuclide (TCN) 10Be geochronology, TCN10Be derived catchment-wide erosion rates, and digital elevation model based geomorphic indices were used todefine the ages of landforms, determine the rates of catchment-wide erosion, and to assess the relative influence of tectonic uplift on catchments within the Mecca Hills. Ages for major geomorphic surfaces based on 10Be surface exposure dating of boulders and 10Be depth profilesdefine the timing of surface formation to 8.2 ± 0.5 ka (Qyf1 surface), 67.2 ± 5.3 ka (Qvof2 surface), and 280 ± 24 ka (Qvof1 surface). Comparison of 10Be measurements from active channel deposits (Qac) and terraces (Qt)illustrate acomplex history of erosion, sediment storage, and sediment transport in this environment.Beryllium-10 catchment-wideerosion rates range from 19.9 ± 3.2 to 149 ± 22.5 m Ma-1and reveal a mean rate of 58.9 ± 10.8 m Ma-1, significantly less than the global mean10Be catchment-wide erosion rate of 218 m/Ma. Geomorphic indices, including the stream length gradient index, ratio of catchment area to volume, and mountain front sinuosity, demonstrate spatialand temporal heterogeneous geomorphic response,forced by rapid tectonic uplift throughout the Mecca Hills.
Lewis Owen, Ph.D. (Committee Chair)
Richard Beck, Ph.D. (Committee Member)
Craig Dietsch, Ph.D. (Committee Member)
56 p.
Geomorphology
geomorphology; cosmogenic; beryllium; erosion rate; geomorphic indices

Recommended Citations

Citations

  • Gray, H. J. (2013). Geomorphic response to transpression and alluvial fan chronology of the Mecca Hills, : a case study along the Southern southern San Andreas fault zone. [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1380613207

    APA Style (7th edition)

  • Gray, Harrison. Geomorphic response to transpression and alluvial fan chronology of the Mecca Hills, : a case study along the Southern southern San Andreas fault zone. 2013. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1380613207.

    MLA Style (8th edition)

  • Gray, Harrison. "Geomorphic response to transpression and alluvial fan chronology of the Mecca Hills, : a case study along the Southern southern San Andreas fault zone." Master's thesis, University of Cincinnati, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1380613207

    Chicago Manual of Style (17th edition)

ucin1380613207
618
© 2013, some rights reserved.Creative Commons License Geomorphic response to transpression and alluvial fan chronology of the Mecca Hills, : a case study along the Southern southern San Andreas fault zone. by Harrison J Gray is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.