Eolian sand, Zuun mod Elstei, Mongolia
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Glass bead is 200 µ in diameter |
Location: |
Zuun mod Elstei, 50 km east of Ulaanbaatar, Mongolia; E 107°28'55.1"; N 47°47'27.5" |
Depositional facies: |
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Provenance: |
Mix of (1) granitoid plutonic rocks and (2) low-medium-grade metasedimentary (schist, marble) and possibly metavolcanic rocks |
Composition: |
Mix of translucent - transparent quartz with pink feldspar, white marble and grey-green low-grade metamorphic rocks (schists); possibly also higher-grade metamorphic rocks involved. Few heavy minerals, including garnets |
Texture: |
Characteristic eolian texture: Medium grained (mL-MU; mean ca. 350 µ), well sorted, depending on mineralogy poorly to well rounded. Characteristic polished, matted ("frosted") grain surfaces typical of eolian transport |
Petrographic thin section:
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Bright field |
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Dark field |
Sample number |
heubeck0142 |
Collector |
Dr. Ochirbat Batkhishig, Institute of Geography, Mongolian Academy of Sciences, Mongolia |
Date of sampling |
January, 2008 |
Comments:
Characteristic eolian texture: Medium grained (mL-MU; mean ca. 350 µ), well sorted, depending on mineralogy poorly to well rounded. Characteristic polished, matted ("frosted") grain surfaces typical of eolian transport
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