Alexandria Digital Research Library

Genesis and evolution of the Pamir Plateau : a petrochronologic view

Author:
Stearns, Michael A.
Degree Supervisor:
Bradley R. Hacker
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2014
Issued Date:
2014
Topics:
Geochemistry, Plate Tectonics, and Petrology
Keywords:
Titanite
Pamir
Geochronology
India-Asia collision
Petrochronology
Monazite
Genres:
Online resources and Dissertations, Academic
Degree Grantor:
University of California, Santa Barbara. Geological Sciences
Dissertation:
Ph.D.--University of California, Santa Barbara, 2014
Description:

The India-Asia collision is the foremost setting to study continent-continent orogenesis, yet mid--deep crustal exposures are rare. In contrast, the Pamir Plateau provides extensive aerial exposure of the deep crust within six gneiss domes. The domes contain a variety of Cenozoic-age metamorphic and igneous rocks exhumed from 8--10 kbar and 700 degrees Celsius. The growth and recrystallization of major and accessory phases in these rocks such as garnet, monazite, and titanite record a robust history of the evolution of the plateau through crustal thickening, metamorphism, and subsequent ongoing collapse. Extracting this record requires accurately understanding and directly linking minerals response to the crustal process of interest. Petrochronology by in situ U/Th-Pb chronometry, trace-element analysis, and thermobarometry is the key to unlocking the physiochemical evolution of the Pamir mid-- deep crust, and orogenic processes in general around the world. The following dissertation contains I) an evaluation of whether titanite records volume-diffusion closure or (re)crystallization, II) a comparison of the monazite record from the Central Pamir and Northern Himalaya gneiss domes, and III) campaign-style titanite petrochronology investigation of the onset of collapse in the Pamir plateau.

Physical Description:
1 online resource (88 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3t151tn
ISBN:
9781321350210
Catalog System Number:
990045117710203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
Michael Stearns
File Description
Access: Public access
Appendix01SSLASS.xls vnd.ms-excel (Microsoft Excel Format, Microsoft Excel)
Appendix02Ch2all.pdf pdf (Portable Document Format)
Appendix03PamirttnU-Pb.xls vnd.ms-excel (Microsoft Excel Format, Microsoft Excel)
Appendix04PamirttnZr.xls vnd.ms-excel (Microsoft Excel Format, Microsoft Excel)
Stearns_ucsb_0035D_12275.pdf pdf (Portable Document Format)