Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau
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The Ohio State University / OhioLINK
2015
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu14376683572021-08-03T06:32:20Z Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau Ahlgren, Kevin Michael Geophysics 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. 2015-10-01 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1437668357 http://rave.ohiolink.edu/etdc/view?acc_num=osu1437668357 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Geophysics |
| spellingShingle |
Geophysics Ahlgren, Kevin Michael Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau |
| author |
Ahlgren, Kevin Michael |
| author_facet |
Ahlgren, Kevin Michael |
| author_sort |
Ahlgren, Kevin Michael |
| title |
Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau |
| title_short |
Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau |
| title_full |
Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau |
| title_fullStr |
Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau |
| title_full_unstemmed |
Gravity Measurements in Bolivia and their Implications for the Tectonic Development of the Central Andean Plateau |
| title_sort |
gravity measurements in bolivia and their implications for the tectonic development of the central andean plateau |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2015 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1437668357 |
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AT ahlgrenkevinmichael gravitymeasurementsinboliviaandtheirimplicationsforthetectonicdevelopmentofthecentralandeanplateau |
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