Interaction of Segments along Rifts that Separate Continents and Ridges that Spread Ocean Floors
The face of the Earth is constantly renewed by continental rifts that open and allow ridges to spread oceanic floor. Both types of these linear extensional structures are morphologically and structurally segmented. This thesis aims to provide insights into the interaction of such segments as they pr...
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Uppsala universitet, Institutionen för geovetenskaper
2004
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ftuppsalauniv:oai:DiVA.org:uu-4134 2023-05-15T16:51:51+02:00 Interaction of Segments along Rifts that Separate Continents and Ridges that Spread Ocean Floors Tentler, Tatiana 2004 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4134 eng eng Uppsala universitet, Institutionen för geovetenskaper Uppsala : Acta Universitatis Upsaliensis Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1104-232X 954 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4134 urn:isbn:91-554-5913-7 info:eu-repo/semantics/openAccess Earth sciences extension oceanic floor rift normal fault segment interaction propagation Geovetenskap Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2004 ftuppsalauniv 2023-02-23T21:44:09Z The face of the Earth is constantly renewed by continental rifts that open and allow ridges to spread oceanic floor. Both types of these linear extensional structures are morphologically and structurally segmented. This thesis aims to provide insights into the interaction of such segments as they propagate and mature. It is based on the results of analogue models of evolving rifts and ridges together with field studies of populations of dilational normal faults in the active rift zone of Iceland. Linkage of initially separate segments along rifts and ridges leads to formation of through-going systems operating on a planetary scale. It is argued here that the processes of segment initiation and growth are effectively scale-independent and essentially the same in wide and narrow modes of extension and for shear and dilational failure. Three distinct types of segment coalescence are recognized; these involve tip-to-tip, one tip-to-sidewall and two tips-to-sidewalls segment linkage. The overall structural pattern, particularly the width of the extending domain and the range of displacements and orientations of smaller-scale internal extensional structures, is influenced by both the geometry of extension and the mechanical properties of the extending material. Types of segment linkage appear to be largely independent of localization of dilation or intensity of magmatic accretion. Instead they are controlled mainly by the relative distribution and orientation of interacting segments. A few orders of segmentation along global rift-ridge systems and arrays of dilational normal faults indicate that linear continuous structures accumulate extension in successive increments during which the segments change their geometries in semi-continuous interaction and coalescence. Doctoral or Postdoctoral Thesis Iceland Uppsala University: Publications (DiVA) |
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Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Earth sciences extension oceanic floor rift normal fault segment interaction propagation Geovetenskap |
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Earth sciences extension oceanic floor rift normal fault segment interaction propagation Geovetenskap Tentler, Tatiana Interaction of Segments along Rifts that Separate Continents and Ridges that Spread Ocean Floors |
topic_facet |
Earth sciences extension oceanic floor rift normal fault segment interaction propagation Geovetenskap |
description |
The face of the Earth is constantly renewed by continental rifts that open and allow ridges to spread oceanic floor. Both types of these linear extensional structures are morphologically and structurally segmented. This thesis aims to provide insights into the interaction of such segments as they propagate and mature. It is based on the results of analogue models of evolving rifts and ridges together with field studies of populations of dilational normal faults in the active rift zone of Iceland. Linkage of initially separate segments along rifts and ridges leads to formation of through-going systems operating on a planetary scale. It is argued here that the processes of segment initiation and growth are effectively scale-independent and essentially the same in wide and narrow modes of extension and for shear and dilational failure. Three distinct types of segment coalescence are recognized; these involve tip-to-tip, one tip-to-sidewall and two tips-to-sidewalls segment linkage. The overall structural pattern, particularly the width of the extending domain and the range of displacements and orientations of smaller-scale internal extensional structures, is influenced by both the geometry of extension and the mechanical properties of the extending material. Types of segment linkage appear to be largely independent of localization of dilation or intensity of magmatic accretion. Instead they are controlled mainly by the relative distribution and orientation of interacting segments. A few orders of segmentation along global rift-ridge systems and arrays of dilational normal faults indicate that linear continuous structures accumulate extension in successive increments during which the segments change their geometries in semi-continuous interaction and coalescence. |
format |
Doctoral or Postdoctoral Thesis |
author |
Tentler, Tatiana |
author_facet |
Tentler, Tatiana |
author_sort |
Tentler, Tatiana |
title |
Interaction of Segments along Rifts that Separate Continents and Ridges that Spread Ocean Floors |
title_short |
Interaction of Segments along Rifts that Separate Continents and Ridges that Spread Ocean Floors |
title_full |
Interaction of Segments along Rifts that Separate Continents and Ridges that Spread Ocean Floors |
title_fullStr |
Interaction of Segments along Rifts that Separate Continents and Ridges that Spread Ocean Floors |
title_full_unstemmed |
Interaction of Segments along Rifts that Separate Continents and Ridges that Spread Ocean Floors |
title_sort |
interaction of segments along rifts that separate continents and ridges that spread ocean floors |
publisher |
Uppsala universitet, Institutionen för geovetenskaper |
publishDate |
2004 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4134 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1104-232X 954 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4134 urn:isbn:91-554-5913-7 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766041958244941824 |