Dear Ioan,
in your thin section several points of a metamorphic and deformation
path seem to be preserved. In a first step, I would try to carefully
establish the textural relationship of your phases, i.e. which of the
phases form the inner core, which of them the reaction rim, which the
matrix. You might find several reaction rims with assemblages specific
to certain pressure- temperature fields. There may also be textures of
different ages be preserved, like a foliation or crenulation in the
core and a younger one with a different orientation in the matrix.
After you've unraveled the relative age of each assemblage, you could
start with thermobarometry and try to establish absolute pressures and
temperatures, if you plan to do so.
A good reference to start with is
Passchier, C.W. and Trouw, R.A.J: Microtectonics. Springer, 1996
(there is newer editions of this book now)
Regards,
Julia Kramer
Quoting Ioan Sanislav <[log in to unmask]>:
> Hi everyone,
>
> I have found an interesting mineral assemblage at thin section scale. The
> assemblage consists of:
> Muscovite+Plagioclase+Chlorite+Garnet+Biotite+Kyanite+Staurolite+Andalusite+Cordierite+Sillimanite
> The order of the minerals represents the succession in the paragenesis.
> Chlorite is the latest matrix phase but earlier chlorite is preserved as
> inclusions in garnet.
> I am curious if anyone has ever found a similar assemblage at thin section
> and/or hand sample and/or outcrop scale.
> Cheers,
> Ioan
>
Dr. Julia Kramer Bernhard
Structural and Economic Geologist
Bern, Switzerland
Tel.: +41-31-301 8182
Mobile: +41-76-493 2413
email: [log in to unmask]
http://www.linkedin.com/in/juliakramer
----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.
|