Dear Leonid

Thanks for your reply.

Best Regards

Leonid's comment is very useful. Basalt magmas are commonly believed to originate by partial melting of the upper mantle peridotites. The lower continental crust is generally no more mafic than basalt. It would require unrealistic amount of heat supply to cause high degree of melting to produce basaltic magma. 

Regards,

Qasim

Dear Qasim

Thanks for your comment.

Best Regards,

Zahra

When the plates collided

Each other at the moment of shallow level of deposits sediment are a Creeting to break several sharing and crushing of rocks and plates further moves Subduction will develop then magma mixing and mingling then moves to upwards lower part of the crust melting with harnfels metamorphic process takes place using low pressure and increasing Temperature. Then during metamorphic reactions pyroxene and olive are forming.

Hi BASAVARAJAPPA,

Thanks for your reply.

So I have a question about your comment, please more explain about the reason of  temperature increasing and is it characteristic of collision zone?

Best Regards,

Zahra 

Leonid,

Can you please send me full reference of J. Longhi et al?

Thanks,

Qasim