Tab. 1+2: Representative electron-microprobe analyses of minerals from Du Toit Nunataks ...

• Main Authors: Schubert, Wolfgang, Olesch, Martin
• Format: Dataset
• Language: English
• Published: PANGAEA 2011
• Subjects: Mineral name; Sample code/label; Comment; Silicon dioxide; Titanium dioxide; Aluminium oxide; ChromiumIII oxide; Magnesium oxide; Calcium oxide; Manganese oxide; Iron oxide, FeO; Sodium oxide; Potassium oxide; Barium oxide; Sum; Number of oxygens; Silicon; Aluminium IV; -; Aluminium VI; Titanium; Chromium; Iron 3+; Magnesium; Calcium; Manganese; Iron 2+; Sodium; Potassium; Aluminium; Barium; Geological sample; Microprobe; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.1594/pangaea.763845; https://doi.pangaea.de/10.1594/PANGAEA.763845

An example of cordierite-bearing gneiss that is part of a high-grade gneiss-migmatite sequence is described from the Hatch Plain in the Read Mountains of the Shackleton Range, Antarctica, for the first time. The cordierite-bearing rocks constitute the more melanosomic portions of the metatectic and migmatitic rocks that are associated with relict granulite facies rocks such as enderbitic granulite and enderbitic garnet granulite. The predominant mineral assemblage in the cordierite-bearing rocks is chemically homogeneous cordierite (XMg 0.61) and biotite (XMg 0.47), strongly zoned garnet (XMg 0.18-0.11), sillimanite, K-feldspar (Or81-94Ab5-18An0.6), plagioclase (An28), and quartz. Inclusions of sillimanite and biotite relics in both garnet and cordierite indicate that garnet and cordierite were produced by the coupled, discontinuous reaction biotite + sillimanite + quartz = cordierite + garnet + K-feldspar + H2O.Various garnet-biotite and garnet-cordierite geothermometers and ... : Supplement to: Schubert, Wolfgang; Olesch, Martin (1995): Cordierite in the Shackleton Range, Antarctica: first recorded occurrence. Polarforschung, 63(2/3), 153-164 ...