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Glass Compositions and Pressures of Partial Crystallization of Magmas Erupted along the Galapagos Spreading Center

Haines, Katherine Ann
http://rave.ohiolink.edu/etdc/view?acc_num=osu1534494034179198

Abstract Details

2018, Master of Science, Ohio State University, Earth Sciences.
As part of a larger project to understand mid ocean ridge systematics and the accretion of oceanic crust, this study will focus on the Galapagos Spreading Center (GSC) and the interaction of the Galapagos plume with mid-ocean ridge processes. Glasses data from along the GSC were used to calculate pressures of partial crystallization using the Kelley and Barton method (2008) that can then be related to depths within the Earth. Depending on the range of pressures of crystallization, models of crustal accretion can then be interpreted from the results. Pressure results can also be related to chemistry along the ridge to further understand how pressures can relate to the Galapagos plume, transform faulting and propagating tips. Chemistry shows the Galapagos plume to affect the GSC from 95.5°W and 86.5°W. Calculated pressures range from east to west along the GSC. The western GSC yields an average pressure of 160 MPa which correlates to 5.6 km into the crust. The central GSC, including plume affected ridge, yields an average pressure of 260 MPa. This correlates to a depth of 9.1 km in the crust. The western GSC yields an average pressure of 172 MPa which correlates to 6 km within the crust. Overall, these average pressures are within range of a 10 km thick crust. However, individual glass results yield a maximum pressure of ~820 MPa. This pressure would correspond to depths that extend into the mantle. Higher pressure results can be explained by crustal-magma processes such as assimilation or magmatic processes such as mixing. K2O vs. P2O5 (wt. %) diagrams suggest that there are mantle heterogeneities along the ridge. This paper will discuss and interpret the results of these high pressures and correlate high-pressure results to chemistry as well as geologic location.
Michael Barton (Advisor)
Wendy Panero (Committee Member)
Thomas Darrah (Committee Member)
108 p.
Earth; Geology; Geophysics
Galapagos; Spreading Center

Recommended Citations

Citations

  • Haines, K. A. (2018). Glass Compositions and Pressures of Partial Crystallization of Magmas Erupted along the Galapagos Spreading Center [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534494034179198

    APA Style (7th edition)

  • Haines, Katherine. Glass Compositions and Pressures of Partial Crystallization of Magmas Erupted along the Galapagos Spreading Center. 2018. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1534494034179198.

    MLA Style (8th edition)

  • Haines, Katherine. "Glass Compositions and Pressures of Partial Crystallization of Magmas Erupted along the Galapagos Spreading Center." Master's thesis, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534494034179198

    Chicago Manual of Style (17th edition)

osu1534494034179198
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This open access ETD is published by The Ohio State University and OhioLINK.