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Direct observation of fault zone str...

Frost, Erik Karl.

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Direct observation of fault zone structure and mechanics in three-dimensions: A study of the SEMP fault system, Austria.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Direct observation of fault zone structure and mechanics in three-dimensions: A study of the SEMP fault system, Austria./
Author:	Frost, Erik Karl.
Description:	140 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5329.
Contained By:	Dissertation Abstracts International71-09B.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3418043
ISBN:	9781124160313

Direct observation of fault zone structure and mechanics in three-dimensions: A study of the SEMP fault system, Austria.
Frost, Erik Karl.

Direct observation of fault zone structure and mechanics in three-dimensions: A study of the SEMP fault system, Austria. - 140 p.

Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5329.

Thesis (Ph.D.)--University of Southern California, 2010.

Outcrops of the Salzach-Ennstal-Mariazell-Puchberg (SEMP) fault system exhumed from depths of &sim;4--17 km allow for the direct observation of fault zone structures throughout the crust, and provide insights into the way this fault, and perhaps others, distributes strain in three dimensions. At Gstatterboden, exhumed from &sim;4--8 km, grain size distributions and small fault data reveal the presence of a 10-m-wide high-strain core towards which strain localized during fault evolution. Brittle fracture was accommodated via constrained comminution, which only occurs in strain-weakening rheologies and favors localization. Exposures of the SEMP at Lichtensteinklamm and Kitzlochklamm, exhumed from &sim;12 km depth, bracket the brittle ductile transition. At these outcrops, the SEMP is characterized by a &sim;70-m-wide, cataclastic fault core that has been altered to clays that transitions downward into a wide, ductile shear zone that has accommodated only minor amounts of strain, placing the majority of displacement on the razor-sharp fault contact. Deformation mechanisms transition from cataclasis and minor amounts of dislocation creep in calcite, to dislocation creep in quartz and calcite occurring against a background of fault-normal solution mass transfer. The ductile/ductile-brittle Rinderkarsee shear zone, exhumed from &sim;17 km, marks the SEMP's continuation into the Tauern Window and is composed of three distinct shear zones. The southern, 100-m-wide shear zone has accommodated the most strain, and shows evidence for creep-accommodated grain boundary sliding in feldspar and quartz, while incipient shear zones contain ductile quartz and brittle-feldspars that undergo dislocation creep as fluids alter Kspar to muscovite, which localizes strain along felspar grain boundaries, encouraging ductility. These findings are compared to results from other faults exhumed from similar depth ranges, highlighting fundamental fault zone structures and characteristics.

ISBN: 9781124160313Subjects--Topical Terms:

516570
Geology.

Direct observation of fault zone structure and mechanics in three-dimensions: A study of the SEMP fault system, Austria.
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020 $a 9781124160313
035 $a (UMI)AAI3418043
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100 1 $a Frost, Erik Karl. $3 1674731
245 1 0 $a Direct observation of fault zone structure and mechanics in three-dimensions: A study of the SEMP fault system, Austria.
300 $a 140 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: 5329.
500 $a Adviser: James Dolan.
502 $a Thesis (Ph.D.)--University of Southern California, 2010.
520 $a Outcrops of the Salzach-Ennstal-Mariazell-Puchberg (SEMP) fault system exhumed from depths of &sim;4--17 km allow for the direct observation of fault zone structures throughout the crust, and provide insights into the way this fault, and perhaps others, distributes strain in three dimensions. At Gstatterboden, exhumed from &sim;4--8 km, grain size distributions and small fault data reveal the presence of a 10-m-wide high-strain core towards which strain localized during fault evolution. Brittle fracture was accommodated via constrained comminution, which only occurs in strain-weakening rheologies and favors localization. Exposures of the SEMP at Lichtensteinklamm and Kitzlochklamm, exhumed from &sim;12 km depth, bracket the brittle ductile transition. At these outcrops, the SEMP is characterized by a &sim;70-m-wide, cataclastic fault core that has been altered to clays that transitions downward into a wide, ductile shear zone that has accommodated only minor amounts of strain, placing the majority of displacement on the razor-sharp fault contact. Deformation mechanisms transition from cataclasis and minor amounts of dislocation creep in calcite, to dislocation creep in quartz and calcite occurring against a background of fault-normal solution mass transfer. The ductile/ductile-brittle Rinderkarsee shear zone, exhumed from &sim;17 km, marks the SEMP's continuation into the Tauern Window and is composed of three distinct shear zones. The southern, 100-m-wide shear zone has accommodated the most strain, and shows evidence for creep-accommodated grain boundary sliding in feldspar and quartz, while incipient shear zones contain ductile quartz and brittle-feldspars that undergo dislocation creep as fluids alter Kspar to muscovite, which localizes strain along felspar grain boundaries, encouraging ductility. These findings are compared to results from other faults exhumed from similar depth ranges, highlighting fundamental fault zone structures and characteristics.
590 $a School code: 0208.
650 4 $a Geology. $3 516570
650 4 $a Geophysics. $3 535228
690 $a 0372
690 $a 0373
710 2 $a University of Southern California. $b Geological Sciences. $3 1035728
773 0 $t Dissertation Abstracts International $g 71-09B.
790 1 0 $a Dolan, James, $e advisor
790 1 0 $a Sammis, Charles $e committee member
790 1 0 $a Nutt, Steve $e committee member
790 $a 0208
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3418043