On melting of the subducted oceanic crust: Effects of subduction induced mantle flow |
| |
| Authors: | Albert T Hsui Bruce D Marsh MNafi Toksz |
| |
| Institution: | Albert T. Hsui, Bruce D. Marsh,M.Nafi Toksöz |
| |
| Abstract: | Based on petrological and geochemical arguments, it is possible that arc magma is derived from subducted oceanic crust. In this paper, regional thermal models have been constructed to study the feasibility of melting cold subducted oceanic crusts at shallow depth (i.e. at depths of about 100 km) by a dynamic mantle. Calculated results suggest that plate subduction will generate an induced flow in the wedge above the subducting slab. This current continuously feeds hot mantle material into the corner and onto the slab surface. A high temperature thermal environment can be maintained in the vicinity of the wedge corner, immediately beneath the over-riding plate. Our regional models further demonstrate quantitatively that production of local melting is possible just about 30 km down dip from the asthenosphere wedge corner. Additional geological processes such as reasonable amounts of shear heating and minor dehydration (which will lower the local melting temperature) will further increase the probability of melting a cold subducted oceanic crust at shallow depth. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
