{"id":{"repo_id":"woods-hole","oai_identifier":"oai:darchive.mblwhoilibrary.org:1912/1295"},"canonical_url":"https://search.dev.ndltd.org/etd/woods-hole/oai:darchive.mblwhoilibrary.org:1912/1295","repository":{"repo_id":"woods-hole","name":"Woods Hole Oceanographic Institute","base_url":"https://darchive.mblwhoilibrary.org/server/oai/request"},"display":{"title":"The origin and tectonic history of the Southwest Philippine Sea","abstract":"This thesis is a collection and analysis of seafloor magnetic anomalies, bathymetry, and the paleomagnetism of DSDP sediments and basalt in the West Philippine Basin, in an attempt to resolve questions about its origin as a marginal basin. Our results suggest that this basin was formed in an Eocene pulse of rapid spreading (v1/2 = 41-44 mm/yr) in a direction (N 21°E) significantly different from later pulses which opened the more eastern basins of the Philippine Sea. The Central Basin Fault appears to be intimately associated with this spreading by nature of its structure and trend, and it may be a remanent of a former ridge system. Our preliminary calculation of paleopole positions also suggests that there was a large amount (60°) of clockwise rotation between this basin and the magnetic pole. This is consistent with rotations of the Pacific plate with respect to the magnetic pole and current directions of Philippine- Pacific'relative rotations. Basement depths of 6 km in the West philippine Basin imply that its crustal and/or lithospheric structure is different from Pacific structure of the same age.","abstract_html":"This thesis is a collection and analysis of seafloor magnetic anomalies, bathymetry, and the paleomagnetism of DSDP sediments and basalt in the West Philippine Basin, in an attempt to resolve questions about its origin as a marginal basin. Our results suggest that this basin was formed in an Eocene pulse of rapid spreading (v1/2 = 41-44 mm/yr) in a direction (N 21°E) significantly different from later pulses which opened the more eastern basins of the Philippine Sea. The Central Basin Fault appears to be intimately associated with this spreading by nature of its structure and trend, and it may be a remanent of a former ridge system. Our preliminary calculation of paleopole positions also suggests that there was a large amount (60°) of clockwise rotation between this basin and the magnetic pole. This is consistent with rotations of the Pacific plate with respect to the magnetic pole and current directions of Philippine- Pacific'relative rotations. Basement depths of 6 km in the West philippine Basin imply that its crustal and/or lithospheric structure is different from Pacific structure of the same age.","abstract_has_math":false,"creators":["Louden, Keith E."],"institution":"Massachusetts Institute of Technology and Woods Hole Oceanographic Institution","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1976,"date_issued":"1976-09","date_published":"1976-09","updated_at":"2026-07-27T22:05:21Z","subjects":["Plate tectonics","Magnetic anomalies","Paleomagnetism","Melville (Ship) Cruise","Thomas Washington (Ship) Cruise Tasaday"],"languages":["en_US"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.doi","label":"DOI","values":["10.1575/1912/1295"],"render_values":[{"text":"10.1575/1912/1295","href":"https://doi.org/10.1575/1912/1295","code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/1912/1295","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Louden, Keith E."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2006-11-08T16:58:52Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2006-11-08T16:58:52Z"]},{"key":"dc:date.issued","label":"Date","values":["1976-09"]},{"key":"dc:publisher","label":"Institution","values":["Massachusetts Institute of Technology and Woods Hole Oceanographic Institution"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Plate tectonics","Magnetic anomalies","Paleomagnetism","Melville (Ship) Cruise","Thomas Washington (Ship) Cruise Tasaday"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.doi","label":"DOI","values":["10.1575/1912/1295"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1912/1295"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 1976"]},{"key":"dc:description.abstract","label":"Abstract","values":["This thesis is a collection and analysis of seafloor magnetic anomalies, bathymetry, and the paleomagnetism of DSDP sediments and basalt in the West Philippine Basin, in an attempt to resolve questions about its origin as a marginal basin. Our results suggest that this basin was formed in an Eocene pulse of rapid spreading (v1/2 = 41-44 mm/yr) in a direction (N 21°E) significantly different from later pulses which opened the more eastern basins of the Philippine Sea. The Central Basin Fault appears to be intimately associated with this spreading by nature of its structure and trend, and it may be a remanent of a former ridge system. Our preliminary calculation of paleopole positions also suggests that there was a large amount (60°) of clockwise rotation between this basin and the magnetic pole. This is consistent with rotations of the Pacific plate with respect to the magnetic pole and current directions of Philippine- Pacific'relative rotations. Basement depths of 6 km in the West philippine Basin imply that its crustal and/or lithospheric structure is different from Pacific structure of the same age."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The origin and tectonic history of the Southwest Philippine Sea"]}]}],"canonical_facts":{"dc:creator":["Louden, Keith E."],"dc:date.accessioned":["2006-11-08T16:58:52Z"],"dc:date.available":["2006-11-08T16:58:52Z"],"dc:date.issued":["1976-09"],"dc:description":["Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 1976"],"dc:description.abstract":["This thesis is a collection and analysis of seafloor magnetic anomalies, bathymetry, and the paleomagnetism of DSDP sediments and basalt in the West Philippine Basin, in an attempt to resolve questions about its origin as a marginal basin. Our results suggest that this basin was formed in an Eocene pulse of rapid spreading (v1/2 = 41-44 mm/yr) in a direction (N 21°E) significantly different from later pulses which opened the more eastern basins of the Philippine Sea. The Central Basin Fault appears to be intimately associated with this spreading by nature of its structure and trend, and it may be a remanent of a former ridge system. Our preliminary calculation of paleopole positions also suggests that there was a large amount (60°) of clockwise rotation between this basin and the magnetic pole. This is consistent with rotations of the Pacific plate with respect to the magnetic pole and current directions of Philippine- Pacific'relative rotations. Basement depths of 6 km in the West philippine Basin imply that its crustal and/or lithospheric structure is different from Pacific structure of the same age."],"dc:format.mimetype":["application/pdf"],"dc:identifier.doi":["10.1575/1912/1295"],"dc:identifier.uri":["https://hdl.handle.net/1912/1295"],"dc:language.iso":["en_US"],"dc:publisher":["Massachusetts Institute of Technology and Woods Hole Oceanographic Institution"],"dc:subject":["Plate tectonics","Magnetic anomalies","Paleomagnetism","Melville (Ship) Cruise","Thomas Washington (Ship) Cruise Tasaday"],"dc:title":["The origin and tectonic history of the Southwest Philippine Sea"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T22:05:21Z"}