Hi,
I am in look out for literatures pertaining to allanite breakdown mehanisms in hybridized I-type meta-aluminous granite. The mafic differentiated source diorite (K2O-4-5%) and potash-rich (K2O 5-7%) granite are variably hybridized. A residual leucocratic micro-granite bearing (2-5%) modal allanite is emplaced along brittle-fractures during late stages of granite crystallization.
I have analyzed 2-5% modal allanite in a late to post-kinematic leucogranite, showing alteration to britholite-(Ce) and parisite-(Ce). The EPMA data shows the transformation is partial; somewhere between allanite - parisite-(Ce) solid solution join. Few Calkinsite-(Ce) is also suspected. The breakdown product of allanite are thorite and clay.
Thanks in advance.
The following paper may be helpful to you
Reviews in Mineralogy and Geochemistry
Allanite and Other REE-Rich Epidote-Group Minerals
Reto Gieré, Sorena S. Sorensen
DOI: 10.2138/gsrmg.56.1.431 Published on January 2004, First Published on January 01, 2004
Hi Nibin, the following few ones, related with allanite breakdown research, might be helpful for you.
Hermann, J., 2002. Allanite: thorium and light rare earth element carrier in subducted crust. Chemical geology, 192(3), pp.289-306.
Spear, F.S., 2010. Monazite–allanite phase relations in metapelites. Chemical Geology, 279(1), pp.55-62.
Janots, E., Engi, M., Berger, A., Allaz, J., Schwarz, J.O. and Spandler, C., 2008. Prograde metamorphic sequence of REE minerals in pelitic rocks of the Central Alps: implications for allanite–monazite–xenotime phase relations from 250 to 610 C. Journal of Metamorphic Geology, 26(5), pp.509-526.
Janots, E., Brunet, F., Goffé, B., Poinssot, C., Burchard, M. and Cemič, L., 2007. Thermochemistry of monazite-(La) and dissakisite-(La): implications for monazite and allanite stability in metapelites. Contributions to Mineralogy and Petrology, 154(1), pp.1-14.
Gregory, C.J., Rubatto, D., Hermann, J., Berger, A. and Engi, M., 2012. Allanite behaviour during incipient melting in the southern Central Alps. Geochimica et cosmochimica acta, 84, pp.433-458.
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