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AN INVESTIGATION OF THE TIMING OF OROGENIC EVENTS IN
SOUTHERN SPAIN AND SOUTHERN CALIFORNIA USING
THE LU/HF AND SM/ND ISOTOPIC SYSTEMS
by
James David Potts
A Thesis Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF SCIENCE
(GEOLOGICAL SCIENCES)
December 2011
Copyright 2011 James David Potts
Object Description
| Title | An investigation of the timing of orogenic events in southern Spain and southern California using the Lu/Hf and Sm/Nd isotopic systems |
| Author | Potts, James David |
| Author email | jimpotts@gmail.com |
| Degree | Master of Science |
| Document type | Thesis |
| Degree program | Geological Sciences |
| School | College of Letters, Arts And Sciences |
| Date defended/completed | 2011-11-01 |
| Date submitted | 2011-11-14 |
| Date approved | 2011-11-14 |
| Restricted until | 2011-11-14 |
| Date published | 2011-11-14 |
| Advisor (committee chair) | Platt, John P. |
| Advisor (committee member) |
Davis, Gregory A. Hammond, Douglas E. |
| Abstract | This study examines the timing of metamorphism in the Betic Cordillera of southern Spain and the Catalina Schist in southern California, using Lu/Hf and Sm/Nd isotopic geochronology on garnet-bearing rocks. Garnets are very common metamorphic minerals; they sequester 176Lu as they grow, and they also incorporate a measurable amount of 147Sm. Both isotopes can be used in conjunction with their respective daughter isotopes to determine the growth or cooling age of the garnets, giving an insight into the timing of the metamorphism. ❧ Five samples are studied from the Internal Zone of the Betic Cordillera. A graphitic-mica schist sample from the structurally lowest tectonic unit (the Nevado-Filábride Complex) produced a Lu/Hf age of 13.3 ± 7.3 Ma and a Sm/Nd age of 15.6 ± 7.4 Ma. The other four Betic samples come from the structurally central tectonic unit (the Alpujarride Complex), and include a garnet-mica schist (Sm/Nd age: 23.8 ± 5.7 Ma) from Almuñecar, a granulite facies metapelite from the Jubrique unit above the Ronda peridotite massif (Lu/Hf age: 192 ±47 Ma, Sm/Nd age: 44 ± 12 Ma), an amphibolitized eclogite from the Blanca unit from beneath the peridotite (Sm/Nd age: 25.1 ± 4.9 Ma), and a garnet peridotite from the Ronda massif in the Sierra Bermeja (Sm/Nd age: 28.3 ± 6.4 Ma). ❧ One sample comes from the Franciscan Complex on Santa Catalina Island in southern California. It is from the Blueschist Unit of the Catalina Schist. This is a garnet-glaucophane-lawsonite schist, from which two separate Lu/Hf ages were obtained. Glaucophane and lawsonite separates defined an isochron with an age of 112.3 ±7.3 Ma, while the garnet separates produced an age of 152 ±23 Ma. ❧ Several of these ages provide useful insights into the metamorphic histories of their respective rock units, but some of the Lu-Hf ages may have been affected by zircon inclusions with isotopically old Hf. The significance of each age is discussed in the light of current knowledge about the rock history, and the strengths and weaknesses of the Lu/Hf and Sm/Nd isotopic systems are compared. |
| Keyword | Garnet; Betic; Catalina; Schist; metamorphism |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Rights | Potts, James David |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume71/etd-PottsJames-403.pdf |
Description
| Title | Page 1 |
| Full text | AN INVESTIGATION OF THE TIMING OF OROGENIC EVENTS IN SOUTHERN SPAIN AND SOUTHERN CALIFORNIA USING THE LU/HF AND SM/ND ISOTOPIC SYSTEMS by James David Potts A Thesis Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE (GEOLOGICAL SCIENCES) December 2011 Copyright 2011 James David Potts |
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