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�u�t�FDr. Zhang Haixiang (���C�ˁC�������{�h���������j
�^�C�g���FHigh P-T melting experiments on hydrous basalt and eclogite:
           implications for the petrogenesis of adakite


���e�F�@A series of melting experiments on hydrous basalt and 
eclogite were conducted under lower crustal P-T conditions 
(900-1050�VC, 1.5 GPa and 2wt% H2O added) using a piston-cylinder 
apparatus. The eclogite which were made from basalt at 1200�VC, 25kbar 
with a duration of 5 hours has the same chemical compositions with 
the basalt. These two kinds of starting materials were conducted at 
the same run under the same P-T conditions. The experimental results 
show that the phase assemblages and their chemical compositions are 
slightly different for the different staring materials, temperatures 
and durations. Phase assemblages and modes of the most equilibrium 
run products are checked if batch melting of MORB slab can generate 
adakitic geochemical features of the partial melt (Sr/Y>30, Y<20 ppm, 
(HREE)chond<5) at 1.5 GPa.
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