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2004-2011 by Roberto Weinberg. All rights reserved. Unlimited
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Ptygmatic folds Mylonitic Granite Dykes
Folded Cross-Bedding in High-Grade Rocks
Melt-lubricated thrusts: an evolution
Ptygmatic folding, Broken Hill
Ptygmatic folding, Broken Hill. Cookie for scale.
Ptygmatic folding, Broken Hill.
|Ptygmatic folding, seen in 3D. hinges plunge steeply. Broken Hill.||Ptygmatic folding.Broken Hill. Note change to boudinage parallel to regional foliation. Half a cookie for scale.|
|Mylonitic granite dykes randomly folded, outcrop on Adelaide road, 13 km from Broken Hill.||Mylonitic granite randomly folded, outcrop on Adelaide road, 13 km from Broken Hill.|
|Mylonitic granite randomly folded, outcrop on Adelaide road, 13 km from Broken Hill.||Mylonitic granite randomly folded, outcrop on Adelaide road, 13 km from Broken Hill.|
|Inverted graded bedding: from sandstone at the base (just above the finger) through to mudstone at the top, now a coarse biotite-sillimanite schist. Notice the refraction of the foliation indicating that the schist is more competent than the sandstone.||Same.||Same, note sharp transition from the coarse schist below to sandstone above.|
|Folded cross-bedding. Note the truncation of folded layers below by the beds above (just below the coin). preserved in concretions within sedimentary rocks that underwent high-grade metamorphism during the 1600M Olarian Orogen.||Two sets of truncated cross-beds, later folded marked by * . Preserved in concretions within sedimentary rocks that underwent high-grade metamorphism during the 1600M Olarian Orogen.||Channel in psammite, preserved in concretions within sedimentary rocks that underwent high-grade metamorphism during the 1600M Olarian Orogen|
|Axial planar leucosome. Twanging locality in Purnamoota road, outside Broken Hill. Late, steep, D3 leucosome bending earlier D2 leucosome.||Conjugate set of leucosomes in shear bands. Note the strong axial planar foliation in the paleosome, bisecting the angle defined by the two sets. Broken Hill.||Axial planar leucosome. Close to the previous locality, leucosomes are found in the axial plane.|
|Sheared Pegmatite. Dextral deformation of K-feldspar grains in pegmatite margin in the Eldee Creek, Broken Hill Block.||
Same shear zone in pegmatite.
|Pseudotachylyte from the detachment fault zone in Stellida, Naxos, Greece.|
|Early stages. Tml-leucosome segregation in an incipient fold.||A more developed stage, diffuse segregation of leucosome into thrust plane.||Tighter fold with a better developed segregation.|
|A tight fold riding on a narrow leucosome detached from the foliated rock below.|