Ductile Structures Photos
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Asymmetric folds in marble and quartzite
Asymmetric antiform-synform pair in marble and quartzite. Rock is of the Plattenkalk Series, Crete, Greece. (180329-68)Download Image
Soft-sediment deformation in Pliocene lakebeds
Soft-sediment deformation expressed as folded Pliocene lakebeds of the Coso Formation, SE California. (180302-20)Download Image
Transposed quartz veins in schist
Transposition fabric expressed by isoclinally folded quartz veins and detached fold hinges in schist, New Zealand. (180129-5)Download Image
Bedding and slaty cleavage, Tennessee
Bedding and slaty cleavage, Precambrian Wilhite Fm, Tennessee. Note how the cleavage refracts to a higher angle in the coarser grained beds. (171120-46)Download Image
Recumbently folded calc-silicate gneiss
Recumbently folded calc-silicate gneiss near Kettle Falls, Washington (150803-77)Download Image
Deformed dike in mylonite
Folded felsic dike in mylonitic rock–indicates deformation continued after intrusion. Okanogan Metamorphic Core Complex, Washington. (150803-47)Download Image
Deformed metaconglomerate (vertical)
Stretched pebble conglomerate of the Precambrian Grandfather Mountain Formation, North Carolina. Photo shows planes parallel and perpendicular to foliation (xy and xz planes of strain ellipsoid). Blue Ridge Province of Appalachian Mountains. (171118-96)Download Image
Bedding and foliation
Bedding and foliation in deformed metaconglomerate. Stretched pebbles lay in the plane of foliation whereas bedding is defined by the subhorizontal fine-grained zone in the middle of the photo. Grandfather Mountain Formation, North Carolina. Blue Ridge Province of Appalachian Mountains. (171118-88)Download Image
Folded radiolarian chert (Vertical)
Folded beds of Jurassic-Cretaceous age radiolarian (ribbon) chert in Marin Headlands, California. (Image ID# 111205-10)Download Image
Ductile shear zone in schist
Ductile shear zone offsets leucrocratic zones –everything is cut by a pegmatite dike (SrD-55)Download Image
Deformed Cambrian trilobite
deformed Cambrian trilobite (SrD-55)Download Image
Coexisting ductile and brittle behavior
Coexisting ductile and brittle behavior: broken pegmatite “intruded” by ductiley flowing calcite marble (SrD-49)Download Image
Slaty Cleavage and bedding in folds
Slaty Cleavage and bedding in anticline-syncline pair. Devonian Old Red Sandstone, SW Wales, UK (SrD-43)Download Image
Sheath fold in marble.
Sheath folds are defined by foliation that forms a full circle on the plane of exposure. In 3 dimensions they resemble socks. (SrD-32)Download Image
Recumbent fold in marble.
Note thickening in hinges, a characteristic of ductile flow. (SrD-17)Download Image
Overturned anticline, Death Valley, CA.
Aerial view of Titus Canyon Anticline, Death Valley National Park, California. This mountain-scale fold is an overturned anticline–the oldest rock lies in the core. Prominent dark red cliffs on right side made of Cambrian Zabriskie Quartzite; younger Carrara Formation makes brownish clffs to left. At the level of the canyon bottom, note how the rock is overturned. SrD-10.Download Image
Anticline-syncline pair in Devonian Old Red Sandstone exposed in cliff face, SW Wales, UK (SrD-03)Download Image
Stretching lineations in mylonitic quartzite. (Met-27)Download Image
Folded mylonitic gneiss, California
Asymmetric folds in gneiss.(IMG_5349)Download Image
Folded Precambrian gneiss.
Folded Precambrian gneiss. (5D-5330)Download Image
Biotite “fish” in quartz mylonite.
Photomicrograph (thin section view) of Biotite “fish” in quartz mylonite. Sense-of-shear is top-right. (2PM-3)Download Image
Slaty cleavage and bedding, SE Alaska
Slaty cleavage and bedding, Chilkat River, SE Alaska. (150618-47)Download Image