Ooid Sand, Great Salt Lake, Utah, USA
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South coast of Great Salt Lake Unknown macro: {table-cell}
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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:
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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 |
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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.
