Dissertation/ Thesis
Petrology, Geochemistry and Geochronology of Volcanic Clasts Contained in Ordovician Strata in the Marathon Fold-Thrust Belt, West Texas
| العنوان: | Petrology, Geochemistry and Geochronology of Volcanic Clasts Contained in Ordovician Strata in the Marathon Fold-Thrust Belt, West Texas |
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| المؤلفون: | Roberts, Jonathon |
| Thesis Advisors: | Richard Hanson, Helge Alsleben, Arthur Busbey |
| بيانات النشر: | Texas Christian University, 2012. |
| سنة النشر: | 2012 |
| المجموعة: | Texas Christian University |
| Original Material: | http://etd.tcu.edu/etdfiles/available/etd-07312012-134254/ |
| مصطلحات موضوعية: | College of Science and Engineering |
| الوصف: | This project examines ancient volcanic boulders derived from the Laurentian shelf and contained in Ordovician off-shelf sediment gravity-flow deposits in the Marathon fold-thrust belt, West Texas. Thirty-six volcanic clasts up to 70 cm across were analyzed from the Lower Ordovician Marathon Formation, Middle Ordovician Fort Peña Formation, and Upper Ordovician Woods Hollow Shale. The clasts are unmetamorphosed but show variable low-temperature alteration. Major and trace element geochemical analyses show a compositional range from alkali basalt through trachyandesite to trachyte. Trace element contents for both the mafic and felsic clasts indicate within-plate settings with an OIB-type source for the volcanism. Felsic clasts in the Fort Peña Formation yielded U-Pb zircon ages of ~706 Ma. These data indicate that the volcanic clasts were derived from one or more Neoproterozoic intrapate volcanic terranes, possibly rift-related, that developed near or along the southern Laurentian margin. |
| Original Identifier: | oai:etd.tcu.edu:etd-07312012-134254 |
| نوع الوثيقة: | Text |
| وصف الملف: | application/pdf; application/octet-stream |
| اللغة: | English |
| الاتاحة: | http://etd.tcu.edu/etdfiles/available/etd-07312012-134254/ |
| Rights: | unrestricted I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to TCU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
| رقم الانضمام: | edsndl.TCU.oai.etd.tcu.edu.etd.07312012.134254 |
| قاعدة البيانات: | Networked Digital Library of Theses & Dissertations |
| الوصف غير متاح. |