cataclasite


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cataclasite

[‚kad·ə′klā‚sīt]
(petrology)
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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.
preliminary geological mapping has identified a number of cataclasite zones on the 35,000 ha property, which Ambrex plans to investigate further, using geophysics and geochemical sampling.
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.
Several lines of evidence indicate that this Waite composite fault zone is the locus of brittle fault reactivation for the entire NFS: (1) the post-Acadian redbeds crop out solely within the Waite zone; (2) although brittle structures are also present locally in the Kellyland and Codyville fault zones and in the intervening areas, they are most abundant in the Waite zone; (3) Waite zone brittle faults contain the greatest amount of both fine- and coarse-grained cataclasite; (4) map-scale brittle fault offset is restricted to the Waite zone; (5) in contrast, the Kellyland and Codyville zones exhibit only very small-scale brittle structures, typically expressed as narrow (<5 cm) cataclasite veins within second-order faults.