Beach sand, Big Island, Hawaii, USA
|
|
|
Onekahakaha Beach Park (Hilo) |
Macro |
Location |
Hilo, Onekahakaha Beach Park, Big Island, Hawaii, USA |
Depositional facies |
medium to high energy beach |
Provenance |
local mixture of offshore bivalve shells and mafic lava |
Composition |
Aragonitic (calcite ?) and phosphatic shell fragments; basaltic VRFs |
Texture |
poorly sorted, subrounded, white, brownish to red, dark gray to black, medium to coarse sand (250 to 1250 μm) |
Petrographic thin section:
Description |
Grobkörnige, karbonatische, z.T. phosphoritische ("hozbraune") Schalenfragmente, z.T. mit deutlichen Wachstumsrippen. Ein auffälliges, im Hellfeld transparentes Olivinkorn mit hellgrünen Interferenzfarben; einige schwarze (aphanitische) feinkörnige-glasige Fragmente basaltischer Lava |
|
|
|
Bright field |
Dark field |
Sample number |
heubeck0013 |
Collector |
Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
Date of sampling |
1993 |
Comments:
replace this text with further comments about the sand ecc.
