Matches in SemOpenAlex for { <https://semopenalex.org/work/W3113148406> ?p ?o ?g. }
Showing items 1 to 78 of
78
with 100 items per page.
- W3113148406 abstract "<p>Tonalite, Trondhjemite, Granodiorite (TTG) rocks in Viti Levu, Fiji islands formed through hydrous melting of gabbroic oceanic crust at low-pressure amphibolite-facies conditions caused by flat subduction of an oceanic plateau from Yavuna creek. During mid Miocene time, magmatic underplating took place and a Qtz-diorite unit was formed out of the gabbro under granulite-facies conditions. The investigated TTG&#180;s occur as stocks and veins within the older gabbroic unit of the Yavuna Pluton.</p><p>Zircon ages show the parental gabbro to be ~47.5 Ma in age, whereas the TTG&#180;s, which can be subdivided into a tonalite and a Qtz-diorite suite, are ~37.1 Ma and ~16.5 Ma, old respectively. The average d<sup>18</sup>O value of ~4.8 in zircon selected from the parental gabbro and the tonalite suggest a very homogenous mantle source. However, about 50% of the analyzed zircons from the gabbroic and tonalitic rock samples showing lower d<sup>18</sup>O values, and these are interpreted as reflecting interaction of hydrothermally altered seafloor with the deep depleted mantle source. eHf&#61512;&#61542; in zircon values of ~13 in the analyzed TTG&#180;s are interpreted as reflecting typical juvenile continental crust. PerpleX whole-rock calculations suggest that the tonalite formed by melting of the gabbro through decompression under water-saturated amphibolite-facies conditions at a temperature of ~770 &#176;C and a pressure of ~3.8 kbar, whereas the Qtz-diorite formed at a temperature up to ~900 &#176;C at very shallow depth close to the Earth&#8217;s surface caused by the emplacement of a magmatic underplate during the mid Miocene. Our investigation provides new evidence for episodic growth of continental crust < 0.1 Ga in the South Pacific region.</p>" @default.
- W3113148406 created "2020-12-21" @default.
- W3113148406 creator A5003311999 @default.
- W3113148406 creator A5008738935 @default.
- W3113148406 creator A5031751266 @default.
- W3113148406 creator A5041945006 @default.
- W3113148406 creator A5069826985 @default.
- W3113148406 creator A5088253993 @default.
- W3113148406 date "2020-03-23" @default.
- W3113148406 modified "2023-09-25" @default.
- W3113148406 title "Cold avalanche, “super subduction”, mantle overturn, followed by buoyant subduction of an oceanic plateau and the formation of TTG´s during the Eocene in Viti Levu, Fiji islands" @default.
- W3113148406 doi "https://doi.org/10.5194/egusphere-egu2020-10410" @default.
- W3113148406 hasPublicationYear "2020" @default.
- W3113148406 type Work @default.
- W3113148406 sameAs 3113148406 @default.
- W3113148406 citedByCount "0" @default.
- W3113148406 crossrefType "posted-content" @default.
- W3113148406 hasAuthorship W3113148406A5003311999 @default.
- W3113148406 hasAuthorship W3113148406A5008738935 @default.
- W3113148406 hasAuthorship W3113148406A5031751266 @default.
- W3113148406 hasAuthorship W3113148406A5041945006 @default.
- W3113148406 hasAuthorship W3113148406A5069826985 @default.
- W3113148406 hasAuthorship W3113148406A5088253993 @default.
- W3113148406 hasConcept C109007969 @default.
- W3113148406 hasConcept C114793014 @default.
- W3113148406 hasConcept C118270999 @default.
- W3113148406 hasConcept C127313418 @default.
- W3113148406 hasConcept C141646446 @default.
- W3113148406 hasConcept C146588470 @default.
- W3113148406 hasConcept C154200439 @default.
- W3113148406 hasConcept C165205528 @default.
- W3113148406 hasConcept C17409809 @default.
- W3113148406 hasConcept C18142444 @default.
- W3113148406 hasConcept C2776698055 @default.
- W3113148406 hasConcept C2778849375 @default.
- W3113148406 hasConcept C42787717 @default.
- W3113148406 hasConcept C58097730 @default.
- W3113148406 hasConcept C5900021 @default.
- W3113148406 hasConcept C67236022 @default.
- W3113148406 hasConcept C77928131 @default.
- W3113148406 hasConcept C79572550 @default.
- W3113148406 hasConcept C79605941 @default.
- W3113148406 hasConceptScore W3113148406C109007969 @default.
- W3113148406 hasConceptScore W3113148406C114793014 @default.
- W3113148406 hasConceptScore W3113148406C118270999 @default.
- W3113148406 hasConceptScore W3113148406C127313418 @default.
- W3113148406 hasConceptScore W3113148406C141646446 @default.
- W3113148406 hasConceptScore W3113148406C146588470 @default.
- W3113148406 hasConceptScore W3113148406C154200439 @default.
- W3113148406 hasConceptScore W3113148406C165205528 @default.
- W3113148406 hasConceptScore W3113148406C17409809 @default.
- W3113148406 hasConceptScore W3113148406C18142444 @default.
- W3113148406 hasConceptScore W3113148406C2776698055 @default.
- W3113148406 hasConceptScore W3113148406C2778849375 @default.
- W3113148406 hasConceptScore W3113148406C42787717 @default.
- W3113148406 hasConceptScore W3113148406C58097730 @default.
- W3113148406 hasConceptScore W3113148406C5900021 @default.
- W3113148406 hasConceptScore W3113148406C67236022 @default.
- W3113148406 hasConceptScore W3113148406C77928131 @default.
- W3113148406 hasConceptScore W3113148406C79572550 @default.
- W3113148406 hasConceptScore W3113148406C79605941 @default.
- W3113148406 hasLocation W31131484061 @default.
- W3113148406 hasOpenAccess W3113148406 @default.
- W3113148406 hasPrimaryLocation W31131484061 @default.
- W3113148406 hasRelatedWork W27821953 @default.
- W3113148406 hasRelatedWork W42674331 @default.
- W3113148406 hasRelatedWork W43882282 @default.
- W3113148406 hasRelatedWork W48446171 @default.
- W3113148406 hasRelatedWork W50789767 @default.
- W3113148406 hasRelatedWork W57480878 @default.
- W3113148406 hasRelatedWork W718504 @default.
- W3113148406 hasRelatedWork W85618399 @default.
- W3113148406 hasRelatedWork W93469224 @default.
- W3113148406 hasRelatedWork W30988108 @default.
- W3113148406 isParatext "false" @default.
- W3113148406 isRetracted "false" @default.
- W3113148406 magId "3113148406" @default.
- W3113148406 workType "article" @default.