Hi Carl,
Your plain light garnet photos look similar to some of the Tasmanian garnets from my PhD thesis, which is available on line at http://eprints.utas.edu.au/9833/
I didn't get a chance to map most of mine, but in my case the cores were usually fairly homogeneous, and the rims (outside the circle of inclusions) was zoned.
Cheers,
--Riia
******************************************
Dr. Riia M. Chmielowski
Senior Research Engineer/Laboratory Manager
Laser-Ablation ICP-MS Laboratory, LTU
SE-971 87 Luleå, Sweden
www.ltu.se/LaserICPMS
Hours: Mon-Thurs 07:30-12:30 or by appointment
Email: [log in to unmask]
Phone: +46 (0)920 492033
Mobile: +46 72 539 07 76
Fax: +46-920-491199
LTU Room: F833
http://ltu-se.academia.edu/RiiaChmielowski
*****************************************
________________________________________
From: Metamorphic Studies Group <[log in to unmask]> on behalf of Carl Guilmette <[log in to unmask]>
Sent: Friday, September 29, 2017 17:41
To: [log in to unmask]
Subject: [geo-metamorphism] Garnet texture
Hi all,
I've attached photos and X-Ray maps of garnet grains from a gt-qtz-pl-bt-ilm+/-chl gneiss. They show a puzzling (to me) texture with a ubiquitous ring of polymineralic inclusions in the mantle. The inclusions have the same mineralogy, same grain size, same composition as the matrix.
Has anyone encountered such textures before? We're not sure they qualify as atoll garnets.
Thanks
Carl
____________________________________________
Carl Guilmette, B.Eng. PhD.
Professeur Adjoint
Chaire de Leadership en Enseignement Virginia-Gaumond
Département de Géologie et Génie Géologique
Université Laval
1-418-656-2131 poste 3137
|