BRITTLE STRUCTURES
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Fault gouge along detachment fault, Nevada
Fault gouge along low-angle normal fault in limestone. Note the asymmetric cataclastic foliation (“P” foliation) 8UW93-134
Download ImageRift valley within W Rift Zone, Iceland
Rift valley within broader Western Rift Zone of the mid-Atlantic ridge, Iceland (180906-76)
Download ImageFault gouge, Cretan Detachment, Greece
Fault gouge developed along the Cretan Detachment fault, Greece (180329-35)
Download ImageNormal fault, Death Valley, CA
Copper Canyon Turtleback fault, a large normal fault that separates metamorphic rocks in footwall (green) from overlying sedimentary and volcanic rocks. (180313-60)
Download Imagefault surface, chattermarks, slickenlines
Fault surface with horizontal slickenlines and chattermarks suggestive of right-lateral, strike-slip, Mojave Desert, California. (171215-42)
Download ImageNormal faults and fault gouge.
Normal faults and fault gouge, Mojave Desert, California. (171215-1)
Download ImageMelange, Washington
Highly deformed rock of Bell Pass Melange, Washington. (150916-23)
Download ImageLewis Thrust fault, N. Montana
The Lewis Thrust places Proterozoic Belt Supergroup over Cretaceous sedimentary rock. It appears at the base of the light-colored ledge (Altyn Dolomite) in the middle of this photo. It’s the dominant structure of Glacier National Park. (170724-8)
Download ImageBrecciated pegmatite
Brecciated pegmatite. Black matrix contains iron oxide. (SrF-62)
Download ImageCalcite fibers on fault surface (vertical).
Growth direction indicates the block in the photo moved to the right and slightly upward. (SrF-59).
Download ImageFault gouge
Color-banded fault gouge along Badwater Turtleback fault, Death Valley, California. Main fault surface is in upper right (SrF-58)
Download ImageFault gouge along fault surface.
Low-angle fault in limestone. Movement was top-right (SrF-57)
Download Imageslickenlines on fault surface, Colorado
near-vertical slickenlines indicate dip-slip movement. Rocky Mountain National Park, Colorado (SrF-55).
Download ImageThrust fault and fold
Thrust fault and folded pyroclastic rock, SE Oregon. Note that displacement dies upward along the fault (SrF-31).
Download ImageImbricate thrust faults.
Imbricate thrust faults, repeating dark brown limestone ledges of the Triassic Dinwoody Formation, SW Montana. Note anticline. (SrF-24)
Download ImageThrust fault, Kyrgyzstan (vertical).
Thrust fault, placing Paleozoic rock over Tertiary rock, Tien Shan Mtns., Kyrgyzstan.
Download ImageLow angle normal fault (detachment fault), Death Valley, CA
The Copper Canyon Turtleback is one of three so-called “turtlebacks” in the Black Mountains, named because their curving shapes resemble the backs of turtles. They consist of a core of ductiley deformed metamorphic basement rock (the greenish rock in the foreground), and “upper plate” of brittley faulted sedimentary or volcanic rock (reddish rock in the middleground), and a low-angle normal fault between them. (SrF-08)
Download ImageConjugate normal faults in marble.
Conjugate normal faults in marble of Noonday Dolomite, Death Valley National Park, California.
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Strike-slip duplex
Right-lateral fault zone with duplex. Rock is sandstone and shale turbidites. (4512-56)
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