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Kinematic Evolution of aTranscurrent Fault Propagating Through Consecutive Volcanic Cones:a Case of Rheology and Separation
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesisAlternative title
Kinematisk utveckling av en strike-slip-förkastning propagerande genom på varandra följandevulkaniska koner: en studie i reologi och separation (Swedish)
Abstract [en]

The main objective of this work is to test the effect of two conical-shaped positive topographic obstacleson propagation of a discrete basement dextral strike-slip or transcurrent fault. A set of sandbox analogue (physical) models was constructed, in which two consecutive sand cones were placed progressivelycloser to each other. Key structural and strain parameters, such axial strain ratios and angular strain, aswell as the width and direction of the basins which formed during deformation were measured and analyzed. This procedure was then repeated with a basal decoupling layer of PDMS beneath each cone,to test the influence of this layer on the deformation.The results show that, for models without a basal decoupling layer, the distance between the two cones governs the end-stage deformation patterns of the topographic obstacles. The proximity of the topographic obstacles causes an increase of their deformation, i.e., results in higher axial strain ratios and angular strain. This effect is particularly noticeable in the first obstacle, which is affected by a strong clockwise rotation. The basal ductile which partly decouples the basement fault from the cover units nullifies the previous effect (the increase in deformation caused by proximity) and, when present, localizes the deformation by not only producing narrower pull-apart basins within the obstacles but alsoby increasing their rotation.

Abstract [sv]

O objectivo deste trabalho foi o de estabelecer os efeitos de uma única falha de desligamento direito emdois obstáculos cónicos consecutivos, de relevo positivo. Adicionalmente, procura-se estabelecer o efeito que uma camada basal dúctil poderá ter na deformação dos obstáculos.Como tal, uma série de modelos análogos foram efetuados onde dois cones de areia consecutivosforam colocados sistematicamente mais próximos um do outro. Durante estas experiências, parâmetros chave de natureza estrutural e de strain foram medidos, tais como os rácios de strain axial e angular,bem como a direção e largura das bacias formadas. Este procedimento foi repetido com uma camadabasal de silicone (PDMS) colocada por baixo dos obstáculos. Os resultados mostram que, para modelos sem a camada de silicone basal, a distância de separação dos cones tem uma influência muito forte no produto final da deformação nos cones. A proximidade dos obstáculos causa um aumento da deformação (ex. valores mais elevados de strain angular e strain axial) em ambos os obstáculos. Este efeito é particularmente visível no primeiro obstáculo, sendo este afetado por uma rotação no sentido dos ponteiros do relógio mais elevada que o segundo.Por fim, verifica-se que a presença da camada basal dúctil nulifica o efeito anterior e, quando presente, focaliza a deformação, não só criando bacias de pull-apart mais estreitas mas tambémcausando uma maior rotação nos obstáculos.

Place, publisher, year, edition, pages
2016. , 58 p.
Series
Examensarbete vid Institutionen för geovetenskaper, ISSN 1650-6553 ; 380
Keyword [en]
Strike-slip, transcurrent, obstacles, deformation, rheology, separation
Keyword [sv]
Strike-slip-förkastning, transcurrent, hinder, deformation, separation, reologi
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-303929OAI: oai:DiVA.org:uu-303929DiVA: diva2:974619
Educational program
Master Programme in Earth Science
Presentation
2016-08-24, Norrland II, Geocentrum, Villavägen 16, Uppsala, 08:00 (English)
Supervisors
Examiners
Available from: 2016-09-27 Created: 2016-09-27 Last updated: 2016-09-27Bibliographically approved

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