A related paper on this subject:

http://rsnz.natlib.govt.nz/volume/rsnz_68/rsnz_68_04_004340.pdf

There are a lot of interesting papers on the subject. Tourmaline is both a 'strong' detrital grain usually found in many meta-sedimentary rocks and a boron bearing aluminosilicate in which many elements can favorably migrate during metamorphic and metasomatic processes. In addition to the paper suggested by Michael Issigonis, you can read the following:

http://www.minsocam.org/ammin/AM70/AM70_1.pdf

Dear Mateo Andres Vega,

Hope the attached paper help.

Regards

Please find attached our paper on the formation of tourmaline in greenschist facies metapelite and related blackwall metasomatic greenschist from Austria.

Best regards,

Guenter Grundmann

ok

Thanks for your answers!