Slab melting versus slab dehydration in subduction-zone magmatism.

Abstract:

:The second critical endpoint in the basalt-H(2)O system was directly determined by a high-pressure and high-temperature X-ray radiography technique. We found that the second critical endpoint occurs at around 3.4 GPa and 770 °C (corresponding to a depth of approximately 100 km in a subducting slab), which is much shallower than the previously estimated conditions. Our results indicate that the melting temperature of the subducting oceanic crust can no longer be defined beyond this critical condition and that the fluid released from subducting oceanic crust at depths greater than 100 km under volcanic arcs is supercritical fluid rather than aqueous fluid and/or hydrous melts. The position of the second critical endpoint explains why there is a limitation to the slab depth at which adakitic magmas are produced, as well as the origin of across-arc geochemical variations of trace elements in volcanic rocks in subduction zones.

authors

Mibe K,Kawamoto T,Matsukage KN,Fei Y,Ono S

doi

10.1073/pnas.1010968108

subject

Has Abstract

pub_date

2011-05-17 00:00:00

pages

8177-82

issue

20

eissn

0027-8424

issn

1091-6490

pii

1010968108

journal_volume

108

pub_type

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