Thesis
Petrogenesis of the Mount Taylor volcanic field and comparison with the Jemez Mountain volcanic field, New Mexico
Washington State University
Master of Science (MS), Washington State University
2011
Handle:
https://hdl.handle.net/2376/102535
Abstract
The Mt. Taylor volcanic field is an eroded composite volcano largely composed of trachyandesite to trachydacite lavas erupted between 3.6-2.5 Ma and lies on the Jemez Lineament, an alignment of Neogene volcanic fields that sit on Precambrian suture zone and intersects the Rio Grande rift. Comprehensive major, trace element, and isotopic analyses augmented with new geologic mapping and 40Ar/39Ar provide new insights on the evolution of the Mount Taylor volcanic field in Northern New Mexico. Rocks from the volcanic field range from 42 to 76% SiO2, with the basalts having MgO contents between 4 and 15 wt%. Compared to the Jemez Mountains volcanic field, Mt. Taylor volcanic field lavas are more alkaline. Comparison of the two volcanic fields offers an understanding of the lineament--influenced vs. extension--influenced factors of petrogenesis. Major, trace elemental, and isotopic data ( 206Pb/204Pb = 18.38--19.57) are consistent with fractional crystallization accompanied by minor crustal contamination to produce the magmas of the Mt. Taylor volcanic field.
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Details
- Title
- Petrogenesis of the Mount Taylor volcanic field and comparison with the Jemez Mountain volcanic field, New Mexico
- Creators
- Kamilla Fellah
- Contributors
- John A. Wolff (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Environment, School of the (CAHNRS)
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525034701842
- Language
- English
- Resource Type
- Thesis