guide to thin section microscopy - Mineralogical Society of America
guide to thin section microscopy - Mineralogical Society of America
guide to thin section microscopy - Mineralogical Society of America
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Guide <strong>to</strong> Thin Section Microscopy<br />
Reaction textures<br />
Raith, Raase & Reinhardt – February 2012<br />
Figures 3-24. Reaction textures in granulites<br />
A-F: Garnet breakdown– A: Radiating Hbl-Opx-Spl kelyphite fringe (garnet peridotite). B,C: Opx+Crd<br />
symplectite (Grt+Qz→Opx+Crd; metapelite; Namibia, Lapland). D: Opx-Sil symplectite (Grt+Qz→<br />
Opx+Sil; Mg-Al granulite, Kola Peninsula). E: Opx-Spr symplectite (Grt+”Mg”→Opx+Spr; Mg-Al<br />
granulite, Eastern Ghats, India). F: Crd-Qz symplectite (metapelite, Lapland). G,H: Breakdown <strong>of</strong><br />
sillimanite <strong>to</strong> form Spr-Crd symplectite (Opx+Sil→Spr+Crd. Mg-Al granulite, southern India).<br />
I: Hercynite (Mt-unmixing, ilmenite), with finely pigmented cordierite rim in mesoperthite-quartz<br />
matrix (Spl+Qz→Crd; metapelite, southern Madagascar). J: Sil+Grt double seam between nearly<br />
opaque spinel and quartz (Spl+Qz→Grt+Sil; Fe-Al granulite, Eastern Ghats, India). K,L: Coronitic and<br />
skeletal garnet formation in plagioclase (Cpx+Fa+Pl→Grt; ferrodiorite, Eastern Ghats, India).<br />
Mineral abbreviations after Whitney & Evans (<strong>America</strong>n Mineralogist, 95, 185–187, 2010).<br />
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