Intrusive Rocks and Processes
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Apophysis of mafic material in gneiss, Greenland (vertical)
Small-scale intrusion (apophysis) of mafic material in Archean gneiss, Greenland (230831-42)
Download ImageFeeder dike intruding tephra, Iceland
Feeder dike intruding tephra with basaltic lava flow above, Iceland (180910-146)
Download ImageDiabase dike intruding metaconglomerate, NE Maine
igneous, intrusive, intrusion, mafic
Download ImageApophysis of basaltic intrusion in granite
Apophysis of basaltic intrusion in granite, coastal Maine. Chilled margin along dike’s edge. (180714-13)
Download ImageAndesitic dike, New Zealand
Meads Wall, an andesite dike intruding lavas on Mt. Ruapehu, New Zealand (180114-15)
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Graphic granite
Graphic granite, produced from simultaneous growth of quartz and orthoclase feldspar (170820-1) k-spar, crystals, kspar
Download ImagePegmatite dike cutting schist, Montana
Precambrian pegmatite dike cutting basement schist, Montana. (170804-11)
Download ImageMafic Dikes intruding Limestone
Mafic Dikes of the Independence Dike Swarm in southern California (ID # 111119-94)
Download ImagePurcell sill, Glacier National Park, Montana.
The dark band in this cliff face is the Purcell Sill, and diorite sill that intrudes rock of the Proterozoic Belt Supergroup in Glacier National Park. The white rock on either side of the sill is bleached because of the contact metamorphism. (Image ID# lg-25)
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Diabase sill in marble, California
Diabase sill in marble, southern Death Valley National Park, California. Note the talc on the left side of the image. Ig-20.
Download ImagePegmatite dike in granitic rock.
Note chilled margin, defined by the finer grained quartz and K-feldspar crystals along the margin of the dike. (Ig-18)
Download ImageComposite dike
Dioritic inclusions in granitic dike intruding slate, southern British Columbia, Canada. (Ig-16)
Download ImagePegmatite intruding gneiss , California
Note how irregular the contact is between the two, and the small sill of pegmatite intruding along foliation in the gneiss. (Image ID # Ig-08)
Download ImageIntrusive contact: southern Sierra Nevada.
Cretaceous granodiorite can be seen intruding Triassic metavolcanic rock of the southern Sierra Nevada. The volcanic rock was contact metamorphosed by the intruding granite.(Image ID# Ig-06)
Download Imagehorizontally oriented dike, Oregon
horizontally oriented basaltic dike, cutting through vertically dipping limestone, SE Oregon. (120623-59)
Download ImageRapakivi granite close-up
Rapakivi granite: a granite with feldspars of orthoclase cores and oligoclase (plagioclase) rims. Note the zoning in the feldsars. Penny for scale. (110530-23)
Download ImageMagmatic flow foliation in granitic rock
Magmatic flow foliation defined by large orthoclase crystals in granitic rock. Photo is about 50cm across. (110131-11)
Download ImageIntrusive contact (vertical)
Contact of granitic igneous rock (tonalite) with metamorphic rock (slate). Note the small sills (apophyses) which invade the country rock. (090704-14)
Download ImageCretaceous granodiorite: Mt. Whitney, CA
Sunrise over Mt. Whitney in Sierra Nevada, the highest summit in California by elevation. (Image ID# ig-02)
Download ImageGranite and Moon.
A typical exposure of granite –coarse grained with an interlocking, random assortment of crystals. Sierra Nevada, California. (Ig-03)
Download ImageIntrusive Igneous Rocks
From left to right, these rocks are arranged in order of decreasing silica content: granite, diorite, and gabbro. (Image ID# ig-26)
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