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Structural, Metamorphic and Geodynamic Aspects of Sheath-Fold Nappe Formation (Rote Wand Nappe, Tauern Window, Eastern Alps) = = Strukturelle, metamorphe und geodynamische Aspekte der Bildung von Zungenfaltendecken (Rote-Wand-Decke, Tauernfenster, Ostalpen).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Structural, Metamorphic and Geodynamic Aspects of Sheath-Fold Nappe Formation (Rote Wand Nappe, Tauern Window, Eastern Alps) =/
其他題名:	Strukturelle, metamorphe und geodynamische Aspekte der Bildung von Zungenfaltendecken (Rote-Wand-Decke, Tauernfenster, Ostalpen).
作者:	Gros, Philip.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	172 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
Contained By:	Dissertations Abstracts International83-03B.
標題:	Maps. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28483030
ISBN:	9798505571279

Structural, Metamorphic and Geodynamic Aspects of Sheath-Fold Nappe Formation (Rote Wand Nappe, Tauern Window, Eastern Alps) = = Strukturelle, metamorphe und geodynamische Aspekte der Bildung von Zungenfaltendecken (Rote-Wand-Decke, Tauernfenster, Ostalpen).
Gros, Philip.

Structural, Metamorphic and Geodynamic Aspects of Sheath-Fold Nappe Formation (Rote Wand Nappe, Tauern Window, Eastern Alps) =Strukturelle, metamorphe und geodynamische Aspekte der Bildung von Zungenfaltendecken (Rote-Wand-Decke, Tauernfenster, Ostalpen). - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 172 p.

Source: Dissertations Abstracts International, Volume: 83-03, Section: B.

Thesis (Ph.D.)--Freie Universitaet Berlin (Germany), 2021.

This item must not be sold to any third party vendors.

The Tauern Window is the largest tectonic window of the Alps. It contains relics of the subduction channel that formed during Cenozoic subduction of the Alpine Tethyan Ocean and the European margin below the Adriatic plate. This thesis documents the structural, kinematic and metamorphic evolution of a segment of this subduction channel exposed in the central Tauern Window.The thesis presents new structural data that document a tens-of-kilometers-scale recumbent sheath fold in the center of the Tauern Window. The fold comprises an isoclinally folded thrust that transported relicts of the former Alpine Tethys (Glockner Nappe s. str.) onto a distal part of the former European continental margin (Rote Wand Nappe). New petrologic data indicate that the fold formed during early stages of exhumation from maximum burial depth at high-pressure conditions (ca. 2 GPa, 500 ◦C). Exhumation of the fold to mid-crustal levels is evidenced by near-isothermal decompression to roughly 1 GPa. The fold ascended in the subduction channel between two contemporaneous opposite-sense shear zones; normal-sense (i. e., top-hinterland) at the top of the fold and thrust-sense (i. e., top-foreland) below. The subduction-related thermal structure of the sheath fold was constrained by Raman spectroscopy on carbonaceous matter (RSCM) thermometry. The greatest peak-temperature conditions are located in the center of the fold at the folded ocean-on-continent thrust. The peak-temperature contours are oriented roughly parallel to the folded nappe contact so that they display a sheath-like pattern that mimics the geometry of the sheath fold itself. This pattern indicates that finite strain during sheath-fold formation decreased laterally from the fold's center. Thus, together with the contemporaneous vertical strain gradients, the fold was shaped at least initially by diapir-like kinematics during exhumation. Lithostratigraphic correlation of the tectonic units in the central Tauern Window that derive from the European margin documents intense, rift-related segmentation of the margin. The Rote Wand Nappe, which is part of the sheath fold, probably originates from an extensional allochthon that was separated from the main margin by an extensive rift basin above strongly thinned continental basement.Here it is proposed that this extensional allochthon, when subducted, caused a perturbation of the flow field in the subduction channel. In line with sheath-fold theory, this caused strain localisation at the extensional allochthon, facilitating its initial diapiric ascent to form a proto-sheath fold. While being further exhumed by the normal-sense shear zone at its top, the rest of the fold was amplified in overall, thrust-sense simple-shear to a pronounced sheath-fold geometry. This model and above observations are compatible with forced channel flow as driving force of the upward-directed flow.This study shows how large structures inherited from rifting - e. g., extensional allochthons - could potentially induce perturbation of flow in subduction channels during the subduction of distal continental margins. Such perturbations can lead to complex kinematics in subduction channels and result in highly non-cylindrical nappes. Further investigation of similar scenarios could contribute to a better understanding of subduction zone dynamics during the transition from oceanic subduction to continent collision.

ISBN: 9798505571279Subjects--Topical Terms:

544078
Maps.

Structural, Metamorphic and Geodynamic Aspects of Sheath-Fold Nappe Formation (Rote Wand Nappe, Tauern Window, Eastern Alps) = = Strukturelle, metamorphe und geodynamische Aspekte der Bildung von Zungenfaltendecken (Rote-Wand-Decke, Tauernfenster, Ostalpen).
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245 1 0 $a Structural, Metamorphic and Geodynamic Aspects of Sheath-Fold Nappe Formation (Rote Wand Nappe, Tauern Window, Eastern Alps) = $b Strukturelle, metamorphe und geodynamische Aspekte der Bildung von Zungenfaltendecken (Rote-Wand-Decke, Tauernfenster, Ostalpen).
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 172 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
500 $a Advisor: Handy, Mark R;John, Timm.
502 $a Thesis (Ph.D.)--Freie Universitaet Berlin (Germany), 2021.
506 $a This item must not be sold to any third party vendors.
520 $a The Tauern Window is the largest tectonic window of the Alps. It contains relics of the subduction channel that formed during Cenozoic subduction of the Alpine Tethyan Ocean and the European margin below the Adriatic plate. This thesis documents the structural, kinematic and metamorphic evolution of a segment of this subduction channel exposed in the central Tauern Window.The thesis presents new structural data that document a tens-of-kilometers-scale recumbent sheath fold in the center of the Tauern Window. The fold comprises an isoclinally folded thrust that transported relicts of the former Alpine Tethys (Glockner Nappe s. str.) onto a distal part of the former European continental margin (Rote Wand Nappe). New petrologic data indicate that the fold formed during early stages of exhumation from maximum burial depth at high-pressure conditions (ca. 2 GPa, 500 ◦C). Exhumation of the fold to mid-crustal levels is evidenced by near-isothermal decompression to roughly 1 GPa. The fold ascended in the subduction channel between two contemporaneous opposite-sense shear zones; normal-sense (i. e., top-hinterland) at the top of the fold and thrust-sense (i. e., top-foreland) below. The subduction-related thermal structure of the sheath fold was constrained by Raman spectroscopy on carbonaceous matter (RSCM) thermometry. The greatest peak-temperature conditions are located in the center of the fold at the folded ocean-on-continent thrust. The peak-temperature contours are oriented roughly parallel to the folded nappe contact so that they display a sheath-like pattern that mimics the geometry of the sheath fold itself. This pattern indicates that finite strain during sheath-fold formation decreased laterally from the fold's center. Thus, together with the contemporaneous vertical strain gradients, the fold was shaped at least initially by diapir-like kinematics during exhumation. Lithostratigraphic correlation of the tectonic units in the central Tauern Window that derive from the European margin documents intense, rift-related segmentation of the margin. The Rote Wand Nappe, which is part of the sheath fold, probably originates from an extensional allochthon that was separated from the main margin by an extensive rift basin above strongly thinned continental basement.Here it is proposed that this extensional allochthon, when subducted, caused a perturbation of the flow field in the subduction channel. In line with sheath-fold theory, this caused strain localisation at the extensional allochthon, facilitating its initial diapiric ascent to form a proto-sheath fold. While being further exhumed by the normal-sense shear zone at its top, the rest of the fold was amplified in overall, thrust-sense simple-shear to a pronounced sheath-fold geometry. This model and above observations are compatible with forced channel flow as driving force of the upward-directed flow.This study shows how large structures inherited from rifting - e. g., extensional allochthons - could potentially induce perturbation of flow in subduction channels during the subduction of distal continental margins. Such perturbations can lead to complex kinematics in subduction channels and result in highly non-cylindrical nappes. Further investigation of similar scenarios could contribute to a better understanding of subduction zone dynamics during the transition from oceanic subduction to continent collision.
520 $a Das Tauernfenster ist das groste tektonische Fenster der Alpen. Es enthalt Reste des Subduktionskanals, der bei der kanozoischen Subduktion der Alpinen Tethys und des europaischen Kontinentalrands unter die adriatische Platte gebildet wurde. Diese Arbeit dokumentiert die Entwicklung der Strukturen, der Kinematik und der Metamorphose in einem Segments dieses Subduktionskanals, das nun im zentralen Tauernfenster aufgeschlossen ist.Die Arbeit zeigt neue Strukturdaten, die eine Zehnerkilometer-grose, liegende Zungenfalte im Zentrum des Tauernfensters belegen. Die Falte beinhaltet eine isoklinal verfaltete Uberschiebung, entlang der Reste der ehemaligen Alpinen Tethys (Glocknerdecke) auf einen distalen Teil des ehemaligen europaischen Kontinentalrands uberschoben worden sind. Neue petrologische Daten zeigen, dass die Falte wahrend der Fruhphase der Exhumierung von der grosten Versenkungstiefe bei Hochdruckbedingungen (ca. 2 GPa, 500 ◦C) gebildet wurde. Die Exhumierung der Falte bis in mittlere Krustentiefe zeigt sich durch annahernd isothermale Dekompression bis etwa 1 GPa. Die Falte stieg im Subduktionskanal zwischen zwei gleichzeitigen Scherzonen mit gegensatzlichen Schersinnen auf; also mit abschiebendem Schersinn (d. h. Hangendblock zum Hinterland) im Hangenden der Falte und uberschiebendem Schersinn (d. h. Hangendblock zum Vorland) im Liegenden.Mittels Ramanspektroskopie an kohligem Material (RSCM) wurde die subduktionsbedingte thermische Struktur der Zungenfalte ermittelt. Die hochsten Temperaturen des Metamorphosehohepunkts finden sich im Zentrum der Falte am verfalteten Uberschiebungskontakt zwischen den ozeanischen und kontinentalen Einheiten. Die Temperatur-Konturlinien des Metamorphosehohepunkts verlaufen etwa parallel zum verfalteten Deckenkontakt. Dies ergibt ein zungenformiges Muster, welches die Form der Zungenfalte selbst nachahmt. Dieses Muster zeigt, dass die finite Verformung wahrend der Zungenfaltenbildung seitlich vom Faltenkern weg abnahm. Zusammen mit dem gleichzeitigen vertikalen Verformungsgradienten ergibt sich daher, dass die Falte am Anfang der Exhumierung durch diapirartige Kinematik geformt wurde.Die lithostratigraphische Korrelation der tektonischen Einheiten im zentralen Tauernfenster, die vom europaischen Kontinentalrand stammen, belegt eine intensive, Rift-bedingte Segmentierung des Kontinentalrands. Die Rote Wand-Decke, ein Teil der Zungenfalte, stammt vermutlich von einem extensionalen Allochthon, das durch ein weites Riftbecken uber stark ausgedunntem kontinentalem Grundgebirge vom Hauptteil des Kontinentalrands abgetrennt war.Hier wird vorgeschlagen, dass dieses extensionale Allochthon bei der Subduktion eine Perturbation im Stromungsfeld des Subduktionskanals erzeugt hat. Dies fuhrte - im Einklang mit der Theorie zu Zungenfalten - zur Lokalisierung der Verformung am extensionalen Allochthon, was den initialen diapirartigen Aufstieg und die Bildung einer Proto-Zungenfalte ermoglichte. Wahrend der weiteren Exhumierung durch die abschiebende Scherzone im Hangenden wurde der Rest der Falte durch einfache Scherung mit uberschiebender Kinematik zu einer ausgepragten Zungenfaltengeometrie amplifiziert. Dieses Modell und die oben geschilderten Beobachtungen sind kompatibel mit erzwungener Kanalstromung (oder "Auspressung") als Antriebskraft der aufwarts gerichteten Stomung.Diese Studie zeigt, wie grose, vom Rifting ererbte Strukturen - z. B. extensionale Allochthone - wahrend der Subduktion von distalen Kontinentalrandern moglicherweise zu Stromungsperturbationen in Subduktionskanalen fuhren konnen. Solche Perturbationen konnen zu komplexer Kinematik in Subduktionskanalen fuhren und somit die Bildung hochgradig nicht-zylindrischen Decken begunstigen. Weitergehende Untersuchungen ahnlicher Szenarien konnten zu einem besseren Verstandnis der Dynamik von Subduktionszonen wahrend des Ubergangs von ozeanischer zu kontinentaler Subduktion fuhren.
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650 4 $a Metamorphism. $3 3566240
650 4 $a Spectrum analysis. $3 520440
650 4 $a Sedimentation & deposition. $3 3566241
650 4 $a Geology. $3 516570
650 4 $a Analytical chemistry. $3 3168300
650 4 $a Mechanics. $3 525881
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