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Earth and Space Sciences · 术语表

什么是 Transpression, transtension？

又称： transpression · transtension

Definition 9.14 University Earth and Space Sciences — Year 3 · 第 9 章 — Extensional and Strike-Slip Tectonics

Transpression is strike-slip deformation combined with shortening across the zone; transtension, strike-slip deformation combined with extension across it. Both arise where the motion between two blocks is oblique to the boundary between them.

Strike-slip structures (not to scale). (a) In a dextral zone, _1 at 45: R shears at 15 and P shears at -15 with the zone’s sense, R' shears at 75 with the opposite sense, tension fractures T parallel to _1. (b) A right step on a dextral fault opens a pull-apart basin; a left step pushes up a ridge. (c) The fault splays upward into a positive flower beneath a ridge and a negative flower beneath a sag. — Strike-slip structures (not to scale). (a) In a dextral zone, $\sigma_1$ at $45{}^{\circ}$ : R shears at $15{}^{\circ}$ and P shears at $-15{}^{\circ}$ with the zone’s sense, R $'$ shears at $75{}^{\circ}$ with the opposite sense, tension fractures T parallel to $\sigma_1$ . (b) A right step on a dextral fault opens a pull-apart basin; a left step pushes up a ridge. (c) The fault splays upward into a positive flower beneath a ridge and a negative flower beneath a sag.

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