Physics – Geophysics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3215302h&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 15, CiteID L15302
Physics
Geophysics
3
Geochemistry: Composition Of The Continental Crust, Geochemistry: Magma Genesis And Partial Melting (3619), History Of Geophysics: Tectonophysics, Marine Geology And Geophysics: Subduction Zone Processes (1031, 3613, 8170, 8413), Mineralogy And Petrology: Igneous Petrology
Scientific paper
Adakitic melts from Papua New Guinea (PNG) show adakitic geochemical characteristics, yet their geodynamic context is unclear. Modern adakites are associated with hot-slab melting and/or remelting of orogenic mafic underplate at convergent margins. Rift-propagation over collision-modified lithosphere may explain the PNG adakite enigma, as PNG was influenced by rapid creation and subduction of oceanic microplates since Mesozoic times. In a new (rift) tectonic regime, decompressional rift melts encountered and melted remnant mafic eclogite and/or garnet-amphibolite slab fragments in arc collisional-modified mantle, and partially equilibrated with metasomatized mantle. Alternatively, hot-slab melting in a proposed newborn subduction zone along the Trobriand Trough could generate adakitic melts, but recent seismic P-wave tomographic models lack evidence for subducting oceanic lithosphere in the adakite melt region; however they do show deep subduction zone remnants as a number of high P-wave anomalies at lithospheric depths, which supports our proposed scenario.
Ben-Avraham Zvi
Haschke M.
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