ETD PDF
Geochemistry of the Galapagos Transform Fault
Citation
Thomas A. Morrow. (2014). Geochemistry of the Galapagos Transform Fault. Theses and Dissertations Collection, University of Idaho Library Digital Collections. https://www.lib.uidaho.edu/digital/etd/items/etd_612.html
- Title:
- Geochemistry of the Galapagos Transform Fault
- Author:
- Thomas A. Morrow
- Date:
- 2014
- Keywords:
- Geology Geochemistry Marine geology
- Program:
- Geology
- Abstract:
- The Galapagos plume has profoundly affected the development and evolution of the nearby (<250 km) Galapagos Transform Fault (GTF). We present major element, trace element, and radiogenic isotope analyses of samples collected from the GTF during SON0158, EWI0004, and MV1007 cruises. We find that GTF lavas are chemically distinct from nearby axial ridge lavas and off-axis seamounts. The GTF lavas are anomalously depleted in incompatible trace elements (ITEs) and have lower ratios of more incompatible to less incompatible trace elements relative to axial lavas; comparable ITE compositions are only observed >300 km from the plume center. We present a melting model that reproduces GTF lava chemistry from a mixture of melts from a two-component mantle. Model results predict that GTF lavas are produced by a mixture of ~4-5% partial melts of a mantle source that has previously undergone partial melting and is being re-melted beneath the TF.
- Description:
- Thesis (M.S., Geology)--University of Idaho, June 2014
- Major Professor:
- Harpp, Karen
- Type:
- Text
- Format:
- application/pdf
Rights
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- In Copyright - Educational Use Permitted. For more information, please contact University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu.
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