River Sand, Rio Pitai, Santa Cruz, Bolivia
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Rio Pitai |
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Macro |
Location:
Rio Pitai, Santa Cruz, Bolivia
Depositional facies:
Broad, shallow and sandy riverbed
Provenance:
The Rio Pitai drains the Subandean Ranges and erodes thick palaeozoic and mesozoic continental sedimentary rocks as well as thick eolian sediments
Composition:
Quartz
Petrographic thin section:
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Moderately sorted, moderately to |
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Bright field |
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Dark field |
Texture:
medium to fine grained, well sorted, subrounded
Sample number |
Collector |
Date of sampling |
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Heubeck0026 |
Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
2003 |
Comments:
The meandering and braided Rio Pitai in the Bolivian lowland of the Amazonas Basin erodes
the Subandean Miocene-Recent fold-and -thrust belt. This belt exposes thick continental successions
of Carboniferous to Cretaceous eolian sandstones. The supermature source, the high mechanical
resistance, and weathering of river sands under a tropical climate all contribute to the maturity.
These sands are most likely multiply recycled.
