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Differentiating Metamorphic Events u...

Kenney, Michael James Steven.

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Differentiating Metamorphic Events using Titanite Petrochronology in the Sierra de Pie de Palo, NW Argentina.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Differentiating Metamorphic Events using Titanite Petrochronology in the Sierra de Pie de Palo, NW Argentina./
作者:	Kenney, Michael James Steven.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	92 p.
附註:	Source: Masters Abstracts International, Volume: 56-03.
Contained By:	Masters Abstracts International56-03(E).
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10246940
ISBN:	9781369616811

Differentiating Metamorphic Events using Titanite Petrochronology in the Sierra de Pie de Palo, NW Argentina.
Kenney, Michael James Steven.

Differentiating Metamorphic Events using Titanite Petrochronology in the Sierra de Pie de Palo, NW Argentina. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 92 p.

Source: Masters Abstracts International, Volume: 56-03.

Thesis (M.S.)--University of California, Davis, 2016.

This item is not available from ProQuest Dissertations & Theses.

Titanite has been shown to retain multiple age and elemental domains in single crystals through high-grade metamorphism. In this study, titanite petrochronology is used to examine whether multiple metamorphic events are preserved along a sample transect towards a mylonitic shear zone in NW Argentina. A secondary goal of this work is to understand the behavior of titanite ages in shear zones.

ISBN: 9781369616811Subjects--Topical Terms:

516570
Geology.

Differentiating Metamorphic Events using Titanite Petrochronology in the Sierra de Pie de Palo, NW Argentina.
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245 1 0 $a Differentiating Metamorphic Events using Titanite Petrochronology in the Sierra de Pie de Palo, NW Argentina.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 92 p.
500 $a Source: Masters Abstracts International, Volume: 56-03.
500 $a Adviser: Sarah M. Roeske.
502 $a Thesis (M.S.)--University of California, Davis, 2016.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Titanite has been shown to retain multiple age and elemental domains in single crystals through high-grade metamorphism. In this study, titanite petrochronology is used to examine whether multiple metamorphic events are preserved along a sample transect towards a mylonitic shear zone in NW Argentina. A secondary goal of this work is to understand the behavior of titanite ages in shear zones.
520 $a A combination of petrographic observations and electron microprobe analyses reveal the textures and compositional domains in titanite and other minerals, including garnet and hornblende. Titanite are elongate, wrapped by the mylonitic fabric, and have patchy elemental and BSE zoning. Garnet has distinct cores and rims, the latter often appear to be in equilibrium with the fabric defining minerals. Hornblende preserves two growth domains: inclusion rich cores and variable thickness overgrowth rims, the latter of which are in equilibrium with the fabric defining minerals. In-situ U-Pb and trace element data was collected in titanite from four samples using SHRIMP-RG and from one sample using LASS-ICPMS and SHRIMP-RG. All samples preserve lower-intercept ages between ~930Ma and 1.0Ga. We observed no correlation between age and BSE or elemental domains; these domains correlate with Al and REE variations. Zr-in-titanite temperatures indicate upper amphibolite facies conditions, ~690-710 ºC.
520 $a Previous studies determined P-T conditions of 560 ºC and 0.8 kbar, and 40Ar/39Ar hornblende cooling ages of ~515 Ma from these same samples. The titanite ages and temperatures determined by this study indicate the U-Pb system and trace elements were not affected by fluid infiltration, recrystallization, or high-strain. 40Ar/ 39Ar hornblende cooling ages of 515 Ma suggest the Pie de Palo complex did not record the regional Famatinian metamorphic event. Overprinting conditions and cooling ages suggest that rims of garnet and hornblende likely correlate to early Paleozoic metamorphism, while textural evidence and titanite ages suggest garnet and hornblende cores grew during the Proterozoic. Titanite records older metamorphic events within this polymetamorphic terrane, even within shear zones.
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650 4 $a Petrology. $3 535210
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