Matches in SemOpenAlex for { <https://semopenalex.org/work/W1667702922> ?p ?o ?g. }
Showing items 1 to 73 of
73
with 100 items per page.
- W1667702922 abstract "In this presentation, I discusss possible relationship between seismic heterogeneities near the core-mantle boundary, hotspot motion and isotope geochemistry observed on the ocean floor, focusing on the region in the Indian and south-Atlantic oceans as an example. Recent seismic results revealed a rapidly-varying very low-velocity province (VLVP) at the base of the mantle extending from the south Atlantic ocean to the Indian ocean. It has been suggested that the VLVP represents an ancient compositional anomaly produced early in the Earth's history [Wen et al., 2001, Wen, 2001]. At the Earth’s surface, the south Atlantic and the Indian oceans have a large number of hotspots and many impressive island chains and aseismic ridges, that are thought to be the tracks left by the passage of surface plates over major hotspots. The orientations and age progressions of these hotspot tracks can be used to study the relative motion between the hotspots. I show that three major long-lived surface hotspots (Tristan, Marion and Kerguelen) geographically within the VLVP exhibit small relative motions (<9 mm/yr) in the past 80 Ma, while other hotspots appear to drift away from the Tristan-Marion-Kerguelen hotspot group. The ocean floor in the south Atlantic and Indian oceans also exhibits the largest isotopic domain delineated on the Earth's ocean floor, the “Dupal anomaly”, which has been suggested to have formed early in the Earth's history. I show that the “Dupal anomaly” maximum observed on the Indian-Atlantic ocean floor geographically coincides with the VLVP when the past plate motions are taken into account. These observations can be explained and related by invoking a mechanism that the Tristan-Marion-Kerguelen hotspots manifest long-lived thermo-chemical plumes and the VLVP serves as an anchor for their relative slow motion and source for the unique Dupal geochemical signature. It is also interesting to note that most of other hotspots, such as Reunion, Comoros, Bouvet and Shona, are geographically adjacent to the VLVP. One possible explanation is that they manifest thermal plumes that are preferentially generated by a large lateral themal gradient and/or a rapid change of rheological properties from outside the VLVP to inside. Reference" @default.
- W1667702922 created "2016-06-24" @default.
- W1667702922 creator A5003385044 @default.
- W1667702922 creator A5012296749 @default.
- W1667702922 creator A5041911993 @default.
- W1667702922 creator A5082686218 @default.
- W1667702922 date "2005-05-01" @default.
- W1667702922 modified "2023-09-24" @default.
- W1667702922 title "Structure and properties of silicate perovskites in the deep mantle" @default.
- W1667702922 hasPublicationYear "2005" @default.
- W1667702922 type Work @default.
- W1667702922 sameAs 1667702922 @default.
- W1667702922 citedByCount "0" @default.
- W1667702922 crossrefType "journal-article" @default.
- W1667702922 hasAuthorship W1667702922A5003385044 @default.
- W1667702922 hasAuthorship W1667702922A5012296749 @default.
- W1667702922 hasAuthorship W1667702922A5041911993 @default.
- W1667702922 hasAuthorship W1667702922A5082686218 @default.
- W1667702922 hasConcept C111368507 @default.
- W1667702922 hasConcept C119477230 @default.
- W1667702922 hasConcept C127313418 @default.
- W1667702922 hasConcept C146481406 @default.
- W1667702922 hasConcept C147894010 @default.
- W1667702922 hasConcept C150320492 @default.
- W1667702922 hasConcept C151730666 @default.
- W1667702922 hasConcept C16942324 @default.
- W1667702922 hasConcept C2985189572 @default.
- W1667702922 hasConcept C33613203 @default.
- W1667702922 hasConcept C67236022 @default.
- W1667702922 hasConcept C77928131 @default.
- W1667702922 hasConcept C8058405 @default.
- W1667702922 hasConceptScore W1667702922C111368507 @default.
- W1667702922 hasConceptScore W1667702922C119477230 @default.
- W1667702922 hasConceptScore W1667702922C127313418 @default.
- W1667702922 hasConceptScore W1667702922C146481406 @default.
- W1667702922 hasConceptScore W1667702922C147894010 @default.
- W1667702922 hasConceptScore W1667702922C150320492 @default.
- W1667702922 hasConceptScore W1667702922C151730666 @default.
- W1667702922 hasConceptScore W1667702922C16942324 @default.
- W1667702922 hasConceptScore W1667702922C2985189572 @default.
- W1667702922 hasConceptScore W1667702922C33613203 @default.
- W1667702922 hasConceptScore W1667702922C67236022 @default.
- W1667702922 hasConceptScore W1667702922C77928131 @default.
- W1667702922 hasConceptScore W1667702922C8058405 @default.
- W1667702922 hasIssue "10" @default.
- W1667702922 hasLocation W16677029221 @default.
- W1667702922 hasOpenAccess W1667702922 @default.
- W1667702922 hasPrimaryLocation W16677029221 @default.
- W1667702922 hasRelatedWork W1489635663 @default.
- W1667702922 hasRelatedWork W1645311059 @default.
- W1667702922 hasRelatedWork W1987424058 @default.
- W1667702922 hasRelatedWork W2019611709 @default.
- W1667702922 hasRelatedWork W2023604492 @default.
- W1667702922 hasRelatedWork W2028715101 @default.
- W1667702922 hasRelatedWork W2036409086 @default.
- W1667702922 hasRelatedWork W2103311221 @default.
- W1667702922 hasRelatedWork W2104674959 @default.
- W1667702922 hasRelatedWork W2121237106 @default.
- W1667702922 hasRelatedWork W2150814038 @default.
- W1667702922 hasRelatedWork W2157175089 @default.
- W1667702922 hasRelatedWork W2617960034 @default.
- W1667702922 hasRelatedWork W2789663593 @default.
- W1667702922 hasRelatedWork W2800754573 @default.
- W1667702922 hasRelatedWork W2963591926 @default.
- W1667702922 hasRelatedWork W3047908247 @default.
- W1667702922 hasRelatedWork W3171344254 @default.
- W1667702922 hasRelatedWork W3184046089 @default.
- W1667702922 hasRelatedWork W188672037 @default.
- W1667702922 hasVolume "69" @default.
- W1667702922 isParatext "false" @default.
- W1667702922 isRetracted "false" @default.
- W1667702922 magId "1667702922" @default.
- W1667702922 workType "article" @default.