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L7 Igneous dyke radiating out from volcanic neck. Ship Rock, New
Mexico, USA
Position: N36° 40' W108° 40' approx.
Elevation: 2188' / 667m
Image format: MF 35mm
IGNEOUS DYKE RADIATING FROM A VOLCANIC NECK
This wall of rock , over 30' (9m) high, is made of IGNEOUS ROCK
that originated within the VOLCANIC NECK in the distance (see
L6). The old volcano is called "Ship Rock" or "Tse'Bit'a'i'" which
means "The Winged Rock" in a Native American language.
When molten rock (MAGMA) rises to the surface from within the
crust, many fractures develop in the rocks just beneath the surface.
Some fractures form a pattern of concentric rings focused around
a volcano and others radiate out from the volcano like the spokes
of a wheel. Ship Rock has two main radial dykes, of which this
superb example is one.
The slope that masks the base of the dyke is a SCREE slope made
of particles WEATHERED off the face of the dyke.
Less detail
Image Trail:
L6 Volcanic neck and dyke. Ship Rock. New Mexico, USA
L19 Volcanic Neck. Devil's Tower. National Monument. Wyoming, USA
L20 Volcanic Neck. Devil's Tower. National Monument. Wyoming, USA
L48 Granite dykes intruding slate. Cornwall, USA
L49 Dormant volcano. Mt Shasta. California, USA
L52 Igneous dyke intrusion. Convict Lake. Cornwall, USA
L79 Glacial Polish on polygonal basalt, Devil's Post Pile, California,
USA
Links:
http://geography.com.sg/tectonics/index.html
www.rockymesa.com/shiprock.htm
www.volcano.und.nodak.edu/vw.html
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