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:
...
...
Description | Moderately sorted, moderately to well rounded quartz sand. Typical for provenance from a fold belt of clastic sedimentary rocks |
|
|
...
Texture:
...
| |
Bright field | Dark field |
Sample number | Heubeck0026 | ||
Collector | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin | ||
Date of sampling |
| 2003 |
|
...
Comments:
...
Further comments on the sand, depositional history, ecc.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.
