2007-03-12 15:24:41 · 3 answers · asked by jack56 1 in Science & Mathematics ➔ Earth Sciences & Geology
Fault-bounded blocks of rock-may be very large, that act as a somewhat coherent unit. Tectonic--because they haven't been emplaced by sedimentary processes.
(1. Small blocks in melange): In accretionary complexes, such as the Franciscan complex of California, a melange unit may be characterized by resistant tectonic blocks of high metamorphic grade (higher grade than rocks surrounding them) or chert---all sitting in a pudding of serpentinite or mudstone/graywacke. These smaller-size tectonic blocks used to be called "knockers"-an old mining term. They are distinguished from "olistostromes" which are blocks that essentially fell, by gravity, into their matrix.
(2 Big fault bounded blocks): The phrase "tectonic block" is also often used to describe very large (map scale) fault-bounded regions--that may rotate differently, for instance, than surrounding blocks.
2007-03-12 16:58:32 · answer #1 · answered by luka d 5 · 0⤊ 0⤋
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2007-03-13 07:42:29 · answer #2 · answered by A.Ganapathy India 7 · 0⤊ 0⤋
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2007-03-13 01:42:44 · answer #3 · answered by Anonymous · 0⤊ 0⤋