Structure and evolution of the East Sierran thrust system, east central California
Structure and evolution of the East Sierran thrust system, east central California
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加利福尼亚州中东部东山脉逆冲系统的结构和演化
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
J. Walker
中科院分区：
文献类型：
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作者：
G. Dunne;J. Walker
一条弧形平行、东北向的收缩变形带，即东锡尔兰逆冲系统（ESTS），沿锡尔兰大陆边缘弧东侧出露约150 km沿着。ESTS的宽度不超过1020公里，估计它容纳了至少109.3公里的水平缩短。值得注意的是，它经历了重复的宽同轴和同轴平面收缩变形，开始于188 Ma之前，并持续超过140 Ma。我们假设，ESTS主要是由于情节下推的弧后岩石圈下的谢尔兰弧的东边缘，促进了拱的作用。由于这一过程，岩石沿着东翼的岩基，包括东STS，被缩短对弧拱。在内华达造山运动期间，ESTS经历了显著的变形，这表明与该事件相关的收缩到平移变形影响了弧的东部围岩以及其西部围岩。
A belt of arc‐parallel, northeast vergent contractional deformation, the East Sierran thrust system (ESTS), crops out for ∼150 km along the east side of the Sierran continental margin arc. The ESTS is nowhere wider than ∼20 km, and it accommodated an estimated minimum of ∼9.3 km of horizontal shortening. Remarkably, it experienced repeated episodes of broadly coaxial and coaxial‐planar contractional deformation beginning prior to 188 Ma and continuing past 140 Ma. We postulate that the ESTS resulted primarily from episodic underthrusting of the back arc lithosphere beneath the east edge of the Sierran arc, facilitated by a buttressing effect of the arc. As a result of this process, rocks along the east flank of the batholith, including the ESTS, were episodically shortened against the arc buttress. The ESTS experienced significant deformation during the Nevadan orogeny, indicating that contractional to transpressive deformation affiliated with this event affected the eastern wall rocks of the arc as well as its western wall rocks.