Ooid Sand, Great Salt Lake, Utah, USA
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South coast of Great Salt Lake |
Macro |
Location |
South coast of Great Salt Lake; Saltaire Beach Resort near exit of I-80; 40º44'51.98"N,112º11'16.92"W |
Depositional facies |
Low energy beach; possibly episodical reworking in small beach dunes |
Provenance |
Local shallow water formation; precipitation of CaCO3 in evaporatively oversaturated water through microbial participation; input of crystal nuclei through eolian or fluvial processes |
Composition |
Carbonate envelope around a detrital nucleus |
Texture |
High textural maturity: very well sorted and rounded, high sphaericity (partly elongate-ellipsoidal), whitish surface, fine sand (160 to 250 μm) |
Petrographic thin sections:
Description |
Radial and tangential aragonite needles, detrital crystal nuclei, mostly mono- or polycrystalline quartz, orthoclase, plagioclase or peloids; few sparry fragments of recrystallised ooids |
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Bright field |
Dark field |
Sample number |
heubeck0016 |
Collector |
Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
Date of sampling |
1991 |
Comments:
Texturelle Reife nicht durch Transport, sondern durch Bildungsbedingungen. Wachstum erst in der Wassersäule, dann möglicherweise Fortsetzung am Grund. Ansammlung durch Strömung und Wellengang in seichten Buchten. Vorkommen von Radial- und Tangentialooiden.
Satellite image on Additional data page
