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Multi-stage Metamorphism of Amphibol...

Starnes, Jesslyn Kathleen.

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Multi-stage Metamorphism of Amphibolite in Franciscan Melange, Ring Mountain, California.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Multi-stage Metamorphism of Amphibolite in Franciscan Melange, Ring Mountain, California./
作者:	Starnes, Jesslyn Kathleen.
面頁冊數:	271 p.
附註:	Source: Masters Abstracts International, Volume: 54-01.
Contained By:	Masters Abstracts International54-01(E).
標題:	Petrology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1569809
ISBN:	9781321364026

Multi-stage Metamorphism of Amphibolite in Franciscan Melange, Ring Mountain, California.
Starnes, Jesslyn Kathleen.

Multi-stage Metamorphism of Amphibolite in Franciscan Melange, Ring Mountain, California. - 271 p.

Source: Masters Abstracts International, Volume: 54-01.

Thesis (M.S.)--University of California, Davis, 2014.

This item is not available from ProQuest Dissertations & Theses.

The Franciscan complex of coastal California is considered the world's type locality for subduction processes and consists of metamorphosed fragments of oceanic crust from a down-going plate as well as metamorphosed sedimentary rocks deposited in or near an oceanic trench above the down-going slab. Although it has been intensely studied for decades, several key questions remain unresolved: When did subduction begin? Was subduction continuous or episodic? Along what P-T paths were Franciscan rocks metamorphosed?

ISBN: 9781321364026Subjects--Topical Terms:

535210
Petrology.

Multi-stage Metamorphism of Amphibolite in Franciscan Melange, Ring Mountain, California.
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245 1 0 $a Multi-stage Metamorphism of Amphibolite in Franciscan Melange, Ring Mountain, California.
300 $a 271 p.
500 $a Source: Masters Abstracts International, Volume: 54-01.
500 $a Adviser: Howard W. Day.
502 $a Thesis (M.S.)--University of California, Davis, 2014.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a The Franciscan complex of coastal California is considered the world's type locality for subduction processes and consists of metamorphosed fragments of oceanic crust from a down-going plate as well as metamorphosed sedimentary rocks deposited in or near an oceanic trench above the down-going slab. Although it has been intensely studied for decades, several key questions remain unresolved: When did subduction begin? Was subduction continuous or episodic? Along what P-T paths were Franciscan rocks metamorphosed?
520 $a This study presents new U-Pb zircon ages from two distinct populations of zircon in a garnet amphibolite that is interpreted as a retrograded eclogite. U-Pb analyses of zircon analyzed in-situ within garnet porphyroblasts yielded a weighted mean 206Pb/238U age of 175.6 +/- 4 Ma whereas zircon separated from the matrix of the sample yielded 159.5 +/- 4 Ma. The latter is similar to ages of high-grade blocks throughout the Franciscan whereas the former suggests Franciscan subduction began at least 16 Ma earlier. The data suggest that subduction and associated metamorphic processes have been continuous from ~180 Ma to at least 133 Ma. Petrological data demonstrate that this garnet amphibolite block progressed along a clock-wise P-T path, from eclogite facies to amphibolite facies, with a subsequent blueschist facies overprint. The two populations of zircon yield individual grain ages that range from ~133 to ~208 Ma, but statistical tests and trace element analyses of the zircon demonstrate that the two populations are distinct and must represent different stages in the metamorphic history of the amphibolite. Geochemical analyses of the zircon, along with textural relationships and Lu-Hf age of the garnet porphyroblasts, imply that the eclogite facies metamorphism was coeval with, or perhaps even older than the oldest zircon population, while the amphibolite facies metamorphism overlapped with the matrix zircon growth.
520 $a This study also demonstrated the viability of dating very small (<40 microns) mineral inclusions in situ within garnet, permitting the petrological context of the target grains to be maintained during analysis.
590 $a School code: 0029.
650 4 $a Petrology. $3 535210
690 $a 0584
710 2 $a University of California, Davis. $b Geology. $3 2122742
773 0 $t Masters Abstracts International $g 54-01(E).
790 $a 0029
791 $a M.S.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1569809