Mafic mantle magmas underplating at the base of the continental arc crust and form the hot zone. These magmas could differentiated to the evolved melts by fractional crystalization and mixing with crustal partial melts (which produced by the heat and volatile transferring from the mafic mantle melts). It is likely that some parts of these magmas cooled and solidified, and form the basaltic sills in the base of arc crust.
Remobilization of the frozen andesitic melts (differentiated mantle magmas) by the newly injection of the hot mafic mantle derived magmas was reported from some of the continental arcs. I need to know whether intrusion of mafic mantle derived magmas could re-melting the cold mantle derived basaltic sills, too?
Thanks
Dear Zahra,
Some times the earliest cooled basalt sills will be heated above their solidus by new pulses of hot magma that carried out by subsequent basalt sills and, then, the previously solidified basalt sills can be remelted. In this case the new melts (remelts) may differ in composition from residual melts because of loss of volatiles on complete solidification.
Regards,
Vahid Ahadnejad (PhD)
Dear Vahid,
Thanks for your comment. So I'll be grateful if you can introduce to me some related references, I really need to know P and T conditions for basaltic sills remelting as well as that produced melt composition and affinity.
Best Regards,
Zahra
Dear Zahra,
The following paper could be useful:
http://petrology.oxfordjournals.org/content/47/3/505.full
Regrads,
Vahid
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