Beach Sand, Oregon, USA
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Erosive coast near Florence, Oregon | Macro |
Location: | near Florence, Oregon |
Depositional facies: | High-energy, erosive beach |
Provenance: | Magmatic arc, low-grade metamophic rocks |
Composition: | Quartz (likely from PRF), andesitic and basaltic VRF, a few dioritic PRF and subvolcanic and low-grade MRF |
Texture: | medium-grained, rounding moderately to godd (depending on mineral hardness), very well sorted |
Petrographic thin section:
Description: | clear monocrystalline quartz in thin section (volc?), VRF, ch, silt (brown, rounded), hints of resolution embayments, accessory amph, epi, silicified VRF, zoned plag |
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Bright field | Dark field |
Sample number | Heubeck0002 |
Collector | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
Date of sampling | 1999 |
Comments:
A typical composition of a sand from a partly eroded magmatic arc on continental crust, exposing volcanic, metamorphic and plutonic rocks. Coastal photo from www.geocities.com/harald_nancy/oregon_coast.htm