15.i.'02
Hello Pulak,
Forty years ago during regional mapping in the Central Cordillera of the
Colombian Andes I came across the assemblage
garnet-andalusite-staurolite-biotite-muscovite in widespread locations, in
rocks mostly just below the first sillimanite isograd. A few samples
contained a bit of fibrolite, too. I was never convinced that this
assemblage was the result of a single metamorphism; in many samples the
staurolite was present only as inclusions in andalusite. I have found my
petrographic notes and some primitive microprobe analyses for three of
these samples. If you could use this information, please let me have your
postal address and I'll send you photocopies of my notes.
Little of this petrological oddity made it into print. It is at least
mentioned in:
Feininger, T., Barrero, D., and Castro, N., 1972, Geología de Parte de los
Departamentos de Antioquia y Caldas: Bogotá, Boletín Geológico v. 20, no.
2, 173 pages.
Good luck!
Tomas Feininger
Département de Géologie
Université Laval
Québec, Canada
