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Ooid
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Sand,
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Great
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Salt
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Lake,
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Utah,
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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 |
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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) |
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Petrographic thin sections:
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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 |
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Comments:
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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
