cataclasite


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cataclasite

[‚kad·ə′klā‚sīt]
(petrology)
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The fault nucleation was filled with breccia, fault gouge, and cataclasite, and the old faults have been blocked by quartz, calcite, and zeolite, which could result in a poor permeability in F19 fault.
Structural Analyses of Overturned and Sheared Rocks in the Caribbean Orogen Hinterlands: Kinematics of Faults and Scaley Fabrics in the Galera Grit and Toco Cataclasite, Toco, Trinidad.
The tectonic contacts demonstrate abundant evidence for brittle deformation, with the development of cataclasite, fault breccia, and chatter marks.
These clasts are distributed continuously within sheets of cohesive cataclasite over a 2 x 4 km area in proximity to the Lucky Strike Orebody, and appear to be the remnants of an orebody that was dismembered and scattered by thrusting.
It is accompanied by tectonically deformed rocks forming cataclasite, mylonite or breccia zones.
A series of cm- to m-spaced ENE-WSW-trending subvertical faults here are filled with cataclasite comprising fine angular (rare 10 mm, mostly <5 mm grain-size) fragments of altered protolith, weakly foliated in some cases, set in a cemented dark grey matrix (almost clay-sized, < 1 [micro]m) (Figure 3(a)).
The angular relations between the cataclastic rocks and the conglomerate units, combined with the presence of cataclasite clasts in the conglomerate units and evidence of dip-slip faults within the basin, suggest an extensional setting, where listric normal faults outline detachment allochthons.
Fault core materials are commonly composed of one or more structural elements such as anastomosing slip surfaces, clay-rich gouge, cataclasite and fault breccias.
On the contact lies the cataclasite zone, which is affected by a weak ankerite-siderite metasomatism.
Slickensides in the basalt cataclasite are developed in quartz and celadonite.