Braided River Sand, Rio Pitai, Santa Cruz, Bolivia
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Rio Pitai |
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Location |
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Rio Pitai, Santa Cruz, Bolivia | |
Depositional facies |
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Broad, shallow and sandy riverbed | |
Provenance |
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The Rio Pitai drains the Subandean Ranges and erodes thick palaeozoic and mesozoic continental sedimentary rocks as well as thick eolian sediments | |
Composition |
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Quartz | |
Texture | Medium to fine grained, well sorted, subrounded |
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Petrographic thin section:
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Description | Moderately sorted, moderately to |
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Bright field | Dark field |
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Texture:
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Sample number | Heubeck0026 | ||
Collector | Date of sampling | Heubeck0026 | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
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Date of sampling | 2003 |
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Comments:
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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.