Geophysical investigations of the Reykjanes Ridge and Kolbeinsey Ridge seafloor spreading centers
Thesis (Ph. D.)--University of Hawaii at Manoa, 1995. Includes bibliographical references (leaves 77-86). Microfiche. ix, 86 leaves, bound ill. (some col.) 29 cm I used a suite of marine geophysical tools to study the structure and tectonics of the slow-spreading Kolbeinsey, Reykjanes and northern M...
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ftunivhawaiimano:oai:scholarspace.manoa.hawaii.edu:10125/9867 2023-07-30T04:04:29+02:00 Geophysical investigations of the Reykjanes Ridge and Kolbeinsey Ridge seafloor spreading centers Appelgate, Bruce 1995 application/pdf http://hdl.handle.net/10125/9867 en-US eng Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Geology and Geophysics; no. 3241 http://hdl.handle.net/10125/9867 All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. Sea-floor spreading -- Reykjanes Ridge Sea-floor spreading -- Mid-Atlantic Ridge Mid-ocean ridges -- North Atlantic Ocean Reykjanes Ridge Mid-Atlantic Ridge Thesis Text 1995 ftunivhawaiimano 2023-07-15T22:27:54Z Thesis (Ph. D.)--University of Hawaii at Manoa, 1995. Includes bibliographical references (leaves 77-86). Microfiche. ix, 86 leaves, bound ill. (some col.) 29 cm I used a suite of marine geophysical tools to study the structure and tectonics of the slow-spreading Kolbeinsey, Reykjanes and northern Mid-Atlantic Ridges. Including Iceland, these ridges constitute a continuous spreading center system more than 2055 km long, and vary in their structural expression and obliquity to the spreading direction. The northern Mid-Atlantic Ridge (MAR) and Reykjanes Ridge between 55°50'N and 63°00'N exhibit systematic along-strike variation in axial valley depth, axial boundary fault throw, relief along the neovolcanic axis, and degree of inter-segment structural discontinuity. The orthogonal northern MAR is separated from the Reykjanes Ridge by the Bight transform fault (56°47'N), a right-stepping linear fault 15 km wide. The volcanic axis of Reykjanes Ridge contains individual volcanic systems 4-45km long (fourth-order segments), superimposed on intermediate-wavelength (13-65km) axial topographic highs that constitute third- or second-order spreading segments. The modem Kolbeinsey Ridge axis contains three first-order segments oriented orthogonally to the spreading direction. These segments are separated by large right-stepping nontransform offsets, the Spar (69.0°N) and Eggvin (70.4°N) discontinuities. The northern KR segment is a robust volcanic edifice 125km long and more than 1000m high. Shallow crust extends east from the northern KR axis to Jan Mayen Island, and I suggest the Jan Mayen hotspot is located beneath the northern KR rather than near Jan Mayen Island. A tectonic reconstruction based on aeromagnetic data indicates that the axial structure of the KR changed from continuous to segmented after anomaly 4. The subsequent structural evolution of the ridge involved ridge propagation, along-strike migration of axial discontinuities, asymmetric spreading, and lateral migration of segment axes that occurred via ... Thesis Iceland Jan Mayen Jan Mayen Island Kolbeinsey North Atlantic ScholarSpace at University of Hawaii at Manoa Jan Mayen Kolbeinsey ENVELOPE(-18.687,-18.687,67.149,67.149) Kolbeinsey Ridge ENVELOPE(-16.917,-16.917,68.833,68.833) Mid-Atlantic Ridge Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) |
institution |
Open Polar |
collection |
ScholarSpace at University of Hawaii at Manoa |
op_collection_id |
ftunivhawaiimano |
language |
English |
topic |
Sea-floor spreading -- Reykjanes Ridge Sea-floor spreading -- Mid-Atlantic Ridge Mid-ocean ridges -- North Atlantic Ocean Reykjanes Ridge Mid-Atlantic Ridge |
spellingShingle |
Sea-floor spreading -- Reykjanes Ridge Sea-floor spreading -- Mid-Atlantic Ridge Mid-ocean ridges -- North Atlantic Ocean Reykjanes Ridge Mid-Atlantic Ridge Appelgate, Bruce Geophysical investigations of the Reykjanes Ridge and Kolbeinsey Ridge seafloor spreading centers |
topic_facet |
Sea-floor spreading -- Reykjanes Ridge Sea-floor spreading -- Mid-Atlantic Ridge Mid-ocean ridges -- North Atlantic Ocean Reykjanes Ridge Mid-Atlantic Ridge |
description |
Thesis (Ph. D.)--University of Hawaii at Manoa, 1995. Includes bibliographical references (leaves 77-86). Microfiche. ix, 86 leaves, bound ill. (some col.) 29 cm I used a suite of marine geophysical tools to study the structure and tectonics of the slow-spreading Kolbeinsey, Reykjanes and northern Mid-Atlantic Ridges. Including Iceland, these ridges constitute a continuous spreading center system more than 2055 km long, and vary in their structural expression and obliquity to the spreading direction. The northern Mid-Atlantic Ridge (MAR) and Reykjanes Ridge between 55°50'N and 63°00'N exhibit systematic along-strike variation in axial valley depth, axial boundary fault throw, relief along the neovolcanic axis, and degree of inter-segment structural discontinuity. The orthogonal northern MAR is separated from the Reykjanes Ridge by the Bight transform fault (56°47'N), a right-stepping linear fault 15 km wide. The volcanic axis of Reykjanes Ridge contains individual volcanic systems 4-45km long (fourth-order segments), superimposed on intermediate-wavelength (13-65km) axial topographic highs that constitute third- or second-order spreading segments. The modem Kolbeinsey Ridge axis contains three first-order segments oriented orthogonally to the spreading direction. These segments are separated by large right-stepping nontransform offsets, the Spar (69.0°N) and Eggvin (70.4°N) discontinuities. The northern KR segment is a robust volcanic edifice 125km long and more than 1000m high. Shallow crust extends east from the northern KR axis to Jan Mayen Island, and I suggest the Jan Mayen hotspot is located beneath the northern KR rather than near Jan Mayen Island. A tectonic reconstruction based on aeromagnetic data indicates that the axial structure of the KR changed from continuous to segmented after anomaly 4. The subsequent structural evolution of the ridge involved ridge propagation, along-strike migration of axial discontinuities, asymmetric spreading, and lateral migration of segment axes that occurred via ... |
format |
Thesis |
author |
Appelgate, Bruce |
author_facet |
Appelgate, Bruce |
author_sort |
Appelgate, Bruce |
title |
Geophysical investigations of the Reykjanes Ridge and Kolbeinsey Ridge seafloor spreading centers |
title_short |
Geophysical investigations of the Reykjanes Ridge and Kolbeinsey Ridge seafloor spreading centers |
title_full |
Geophysical investigations of the Reykjanes Ridge and Kolbeinsey Ridge seafloor spreading centers |
title_fullStr |
Geophysical investigations of the Reykjanes Ridge and Kolbeinsey Ridge seafloor spreading centers |
title_full_unstemmed |
Geophysical investigations of the Reykjanes Ridge and Kolbeinsey Ridge seafloor spreading centers |
title_sort |
geophysical investigations of the reykjanes ridge and kolbeinsey ridge seafloor spreading centers |
publishDate |
1995 |
url |
http://hdl.handle.net/10125/9867 |
long_lat |
ENVELOPE(-18.687,-18.687,67.149,67.149) ENVELOPE(-16.917,-16.917,68.833,68.833) ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Jan Mayen Kolbeinsey Kolbeinsey Ridge Mid-Atlantic Ridge Reykjanes |
geographic_facet |
Jan Mayen Kolbeinsey Kolbeinsey Ridge Mid-Atlantic Ridge Reykjanes |
genre |
Iceland Jan Mayen Jan Mayen Island Kolbeinsey North Atlantic |
genre_facet |
Iceland Jan Mayen Jan Mayen Island Kolbeinsey North Atlantic |
op_relation |
Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Geology and Geophysics; no. 3241 http://hdl.handle.net/10125/9867 |
op_rights |
All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. |
_version_ |
1772815967717425152 |