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ETD Abstract Container

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Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau

Ahlgren, Kevin Michael
http://orcid.org/0000-0003-0453-6323
http://rave.ohiolink.edu/etdc/view?acc_num=osu1437668357

Abstract Details

2015, Doctor of Philosophy, Ohio State University, Geodetic Science and Surveying.
A geodetic network of gravity stations in Bolivia was established, reduced, adjusted, and analyzed. This network consists of more than 1300 relative stations with estimated precisions of less than ±0.15 mGal. The network is supported and adjusted using 15 absolute gravity stations. The motivation for observing a completely new and large gravity network in Bolivia is to contribute to the global geopotential model (GGM), which will eventually succeed EGM2008, to provide Bolivia with a much-improved height system, and to use these results to place new geophysical constraints on geodynamic models of the Central Andes. The Central Andes comprise an area of South America associated with a widening of the Andean mountain belt. The evolution of this portion of the range is not completely understood. Traditionally, models with large amounts of steady crustal shortening and thickening over a period of time from 30 Ma - 10 Ma have been hypothesized. Recently, an alternative hypothesis involving a rapid rise of the Central Andes between 10 - 6.8 Ma has been proposed. A tectonic model of this rapid rise hypothesis is developed using locally-compensated isostatic assumptions and delamination of a dense layer of eclogite in the lithospheric mantle. The model is ultimately evaluated for consistency with the observed isostatic gravity anomaly field. Consistency between the model and the isostatic anomaly field is not supported though and fails to support the rapid rise delamination hypothesis.
Michael Bevis (Advisor)
Alan Saalfeld (Committee Member)
Ralph von Frese (Committee Member)
150 p.
Geophysics

Recommended Citations

Citations

  • Ahlgren, K. M. (2015). Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437668357

    APA Style (7th edition)

  • Ahlgren, Kevin. Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau. 2015. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1437668357.

    MLA Style (8th edition)

  • Ahlgren, Kevin. "Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau." Doctoral dissertation, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437668357

    Chicago Manual of Style (17th edition)

osu1437668357
904
© 2015, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.