Migmatic Orthogneiss - a photo on Flickriver

            This picture was taken where Big Beaver Creek enters Ross Lake.  The Reservoir was low and so the cascades of Big Beaver Creek were exposed. These pictures of this gneiss were all taken there.
 
From the North Cascades Geologic Map:

TKsg Skagit Gneiss Complex (middle Eocene to Late Cretaceous)—Mix of schist, amphibolite, and rare marble and ultramafic rocks mostly derived from marine sedimentary and volcanic rocks that is intruded by sills of igneous rocks, which are now metamorphosed to orthogneiss. The original schist, amphibolite, and marble may have been continuous with the Napeequa Schist (units TKns, Kns) and (or) the Cascade River Schist (units TKcs, Kcs) described below.

Orthogneiss bodies range from a few centimeters thick in the layered gneisses to several kilometers thick in mapped bodies of orthogneiss. Many of these rocks are crosscut by a variety
of lighter colored igneous dikes and are so mixed that they are called migmatite. These rocks were about 16 miles deep in the Earth when intruded by magma and metamorphosed about 75
to 90 million years ago. Metamorphism of these rocks continued until, or resumed at, about 45 million years ago when more light-colored magma invaded the rock. Locally shown as orthogneiss and orthogneiss of The Needle. [MBse]

TKso Orthogneiss—Gneissic hornblende-biotite tonalite. Relatively uniform granitic rock, but locally
migmatitic with many crosscutting light-colored dikes
   

Taken on: September 7, 2019

Tags:

Migmite

Orthogneiss

gneiss

Sets appears in: • Big Beaver Valley, North Cascades National Park

Groups appears in: • Rocks and Geology • Earth Science Teaching Resource more » • Geology/EarthScience • GEO IMAGES: annotations, illustrations and illuminations. • Geology Porn • Geology Flickrs « less

Camera: Olympus TG-870, f/5.2, 1/1000 sec, 9.4mm, ISO 125 (more info) (hide info)

Camera:	Olympus TG-870
Aperture:	f/5.2
Exposure Time:	0.001 sec (1/1000)
Focal Length:	9.4mm
ISO:	125
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Creative (Slow speed)
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Scene Capture Type:	Landscape
Color Space:	sRGB
Software:	Version 1.0
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