Braided River Sand, Rio Pitai, Santa Cruz, Bolivia
|
| |
Rio Pitai |
| 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 | |
Texture | Medium to fine grained, well sorted, subrounded |
...
Petrographic thin section:
...
| Moderately sorted, moderately to |
|
| |
Bright field |
| Dark field |
...
Texture:
...
Sample number | Heubeck0026 | ||
Collector | Date of sampling | Heubeck0026 | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
|---|---|---|---|
Date of sampling | 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.
