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Transportation of beryllium with H 2 O at high pressures: Implication for magma genesis in subduction zones
Author(s) -
Tatsumi Yoshiyuki,
Isoyama Hirofumi
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i002p00180
Subject(s) - subduction , geology , partial melting , slab , mantle (geology) , mantle wedge , geochemistry , lithosphere , beryllium , adakite , oceanic crust , petrology , geophysics , tectonics , seismology , physics , nuclear physics
The degree of transportation of beryllium with H 2 O is measured under the upper mantle P/T conditions in order to examine the incorporation of 10 Be in subduction zone magmas. 5.4±0.3% of original beryllium in the starting serpentinite is extracted with H 2 O from the system through the dehydration reaction of serpentine at 850°C and 1.5 GPa. It follows that the partial melting of oceanic lithosphere including 10 Be‐rich sediment layer is not necessarily required for inclusion of the isotope in island‐arc lavas. We suggest that the dehydration processes in the subducted slab and mantle wedge materials dragged downward by the slab subduction govern the concentration of 10 Be in arc lavas.