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 />
Figure 3-25. Reaction textures in granulites and HP- <strong>to</strong> UHP-metamorphic rocks<br />
A: Garnet coronas around clinopyroxene (Cpx+Pl→Grt+Qz; calcsilicate rock, Eastern Ghats Belt,<br />
India). B: Monticellite+wollas<strong>to</strong>nite symplectite (åkermanite→Mtc+Wol; calcsilicate rock, Adirondacks,<br />
USA). C: Anorthite+calcite symplectite (meionite→An+Cal; calcsilicate rock, Eastern Ghats<br />
Belt, India). D: Cal+Qz aggregate (Wol+CO 2 →Cal+Qz; South Norway). E: Periclase with brucite<br />
fringe (Per+H 2 O→Bru; calcsilicate marble, Bad Harzburg, Germany). F: Diopside corona around<br />
forsterite (Fo+Cal+CO 2 →Di+Dol; marble, South Madagascar). G: Pseudomorphic replacement <strong>of</strong><br />
corundum by spinel (Crn+”MgO”→Spl; Corundum-anorthite rock, South Madagascar). H: Fayalite+<br />
quartz symplectite (ferrosilite→Fa+Qz; Eastern Ghats Belt, India). I,J: Polymorphic transformation<br />
coesite→quartz (Dora Maira, Western Alps). K,L: Reaction omphacite+quartz→diopside+albite<br />
(eclogite; Saualpe, Austria).<br />
Mineral abbreviations after Whitney & Evans (<strong>America</strong>n Mineralogist, 95, 185–187, 2010).<br />
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