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L48 Granite dykes intruding slate. Cornwall, USA
Position:
N50° 10' 30''
W36° 30'' approx.
Elevation:
at sea level
Image format:
35mm
GRANITE DYKES INTRUDING SLATE
Thin sheets of light colored GRANITE have invaded the dark colored
SLATE. Sheets like this are called DYKES. The dykes came from
a nearby lager mass of granite called a PLUTON. The heat and pressure
around the pluton caused cracks and fissures to form in the surrounding
rock. Hot, molten granite was injected under pressure into the
fissures forming what we now call dykes.
Less detail
Image Trail:
L6 Volcanic neck and dyke. Ship Rock. New Mexico, USA
L7 Igneous dyke radiating out from volcanic neck. Ship Rock. New
Mexico,
L52 Igneous dyke intrusion. Convict Lake. Cornwall, USA
Links:
http://geography.com.sg/tectonics/index.html |
