The Evolution of the Indian Ocean Triple Junction and the Finite Rotation Problem.
The three papers of this thesis demonstrate that studies of the stability and evolution of triple junctions and of the finite rotations of systems of three plates can yield significantly more accurate tectonic histories than can studies of relative motions between two plates alone. Topographic and m...
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ftdtic:ADA089103 2023-05-15T13:43:37+02:00 The Evolution of the Indian Ocean Triple Junction and the Finite Rotation Problem. Tapscott,Christopher Robert WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS 1980-09 text/html http://www.dtic.mil/docs/citations/ADA089103 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA089103 en eng http://www.dtic.mil/docs/citations/ADA089103 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Physical and Dynamic Oceanography Geology Geochemistry and Mineralogy *OCEAN RIDGES *SEAFLOOR SPREADING *TECTONICS VELOCITY INDIA THESES CONTINENTAL DRIFT PLATES EVOLUTION(GENERAL) JUNCTIONS AFRICA ROTATION RIGIDITY INDIAN OCEAN OCEANIC CRUST ANTARCTIC REGIONS GREENLAND MAGNETIC ANOMALIES LITHOSPHERE LABRADOR SEA Plate tectonics Triple junctions Southwest Indian Ridge WUNR083004 Text 1980 ftdtic 2016-02-20T18:37:05Z The three papers of this thesis demonstrate that studies of the stability and evolution of triple junctions and of the finite rotations of systems of three plates can yield significantly more accurate tectonic histories than can studies of relative motions between two plates alone. Topographic and magnetic investigation of the Southwest Indian Ridge and reconstruction of the plate system of the Indian Ocean shows that both Africa and Antarctica are rigid plates and their pole of relative rotation has remained fixed near 8 deg N, 42 deg W since the Eocene. A detailed survey of the Indian Ocean triple junction reveals that the Indian Ocean plate motions have remained constant since 10 Ma. Stability conditions of the junctions show that the general morphology of the Southwest Indian Ridge results from the evolution of the Indian Ocean triple junction. A method is presented for determining the finite rotations best reconstructing the past relative positions of three plates around a triple junction. The method is illustrated by reconstructions of the plates around the Labrador Sea triple junction at the times of anomalies 24 (56 Ma) and 21 (50 Ma). Prepared in cooperation with Massachusetts Inst. of Tech., Cambridge. Dept. of Earth and Planetary Sciences, Contract N00014-75-C-0291. Text Antarc* Antarctic Antarctica Greenland Labrador Sea Defense Technical Information Center: DTIC Technical Reports database Antarctic Greenland Indian |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Physical and Dynamic Oceanography Geology Geochemistry and Mineralogy *OCEAN RIDGES *SEAFLOOR SPREADING *TECTONICS VELOCITY INDIA THESES CONTINENTAL DRIFT PLATES EVOLUTION(GENERAL) JUNCTIONS AFRICA ROTATION RIGIDITY INDIAN OCEAN OCEANIC CRUST ANTARCTIC REGIONS GREENLAND MAGNETIC ANOMALIES LITHOSPHERE LABRADOR SEA Plate tectonics Triple junctions Southwest Indian Ridge WUNR083004 |
spellingShingle |
Physical and Dynamic Oceanography Geology Geochemistry and Mineralogy *OCEAN RIDGES *SEAFLOOR SPREADING *TECTONICS VELOCITY INDIA THESES CONTINENTAL DRIFT PLATES EVOLUTION(GENERAL) JUNCTIONS AFRICA ROTATION RIGIDITY INDIAN OCEAN OCEANIC CRUST ANTARCTIC REGIONS GREENLAND MAGNETIC ANOMALIES LITHOSPHERE LABRADOR SEA Plate tectonics Triple junctions Southwest Indian Ridge WUNR083004 Tapscott,Christopher Robert The Evolution of the Indian Ocean Triple Junction and the Finite Rotation Problem. |
topic_facet |
Physical and Dynamic Oceanography Geology Geochemistry and Mineralogy *OCEAN RIDGES *SEAFLOOR SPREADING *TECTONICS VELOCITY INDIA THESES CONTINENTAL DRIFT PLATES EVOLUTION(GENERAL) JUNCTIONS AFRICA ROTATION RIGIDITY INDIAN OCEAN OCEANIC CRUST ANTARCTIC REGIONS GREENLAND MAGNETIC ANOMALIES LITHOSPHERE LABRADOR SEA Plate tectonics Triple junctions Southwest Indian Ridge WUNR083004 |
description |
The three papers of this thesis demonstrate that studies of the stability and evolution of triple junctions and of the finite rotations of systems of three plates can yield significantly more accurate tectonic histories than can studies of relative motions between two plates alone. Topographic and magnetic investigation of the Southwest Indian Ridge and reconstruction of the plate system of the Indian Ocean shows that both Africa and Antarctica are rigid plates and their pole of relative rotation has remained fixed near 8 deg N, 42 deg W since the Eocene. A detailed survey of the Indian Ocean triple junction reveals that the Indian Ocean plate motions have remained constant since 10 Ma. Stability conditions of the junctions show that the general morphology of the Southwest Indian Ridge results from the evolution of the Indian Ocean triple junction. A method is presented for determining the finite rotations best reconstructing the past relative positions of three plates around a triple junction. The method is illustrated by reconstructions of the plates around the Labrador Sea triple junction at the times of anomalies 24 (56 Ma) and 21 (50 Ma). Prepared in cooperation with Massachusetts Inst. of Tech., Cambridge. Dept. of Earth and Planetary Sciences, Contract N00014-75-C-0291. |
author2 |
WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS |
format |
Text |
author |
Tapscott,Christopher Robert |
author_facet |
Tapscott,Christopher Robert |
author_sort |
Tapscott,Christopher Robert |
title |
The Evolution of the Indian Ocean Triple Junction and the Finite Rotation Problem. |
title_short |
The Evolution of the Indian Ocean Triple Junction and the Finite Rotation Problem. |
title_full |
The Evolution of the Indian Ocean Triple Junction and the Finite Rotation Problem. |
title_fullStr |
The Evolution of the Indian Ocean Triple Junction and the Finite Rotation Problem. |
title_full_unstemmed |
The Evolution of the Indian Ocean Triple Junction and the Finite Rotation Problem. |
title_sort |
evolution of the indian ocean triple junction and the finite rotation problem. |
publishDate |
1980 |
url |
http://www.dtic.mil/docs/citations/ADA089103 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA089103 |
geographic |
Antarctic Greenland Indian |
geographic_facet |
Antarctic Greenland Indian |
genre |
Antarc* Antarctic Antarctica Greenland Labrador Sea |
genre_facet |
Antarc* Antarctic Antarctica Greenland Labrador Sea |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA089103 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766191202281979904 |