Three-stage evolution of the Los Angeles basin, southern California
Three-stage evolution of the Los Angeles basin, southern California
复制标题
南加州洛杉矶盆地的三阶段演化
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
P. Rumelhart
中科院分区：
文献类型：
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作者：
R. Ingersoll;P. Rumelhart
我们认为，洛杉矶盆地地区在12-6 Ma，在中新世转转之后，现代转压体制之前，是由一幕伸展作用主导的。伸展是由于圣加布里埃尔-奇诺山-克里斯蒂亚尼托斯断层的释放弯曲造成的，在这一幕中，该断层是加利福尼亚州南部的主要转换边界。这样的解释表明，在6 Ma之前，圣安德烈亚斯断裂南部并没有发生显著的转换运动，而加利福尼亚州海湾主要是从6 Ma开始开放的。我们提出了洛杉矶盆地及其附近地区在不断演化的转换断层系统内的三个阶段的演化模式：转转(18-12 Ma)、转张(12-6 Ma)和转压(6-0 Ma)。这些阶段的时间与微板捕获事件相关，微板捕获事件发生在从收敛边缘到转换边缘的转换过程中。
We propose that an episode of transtension dominated development of the Los Angeles basin area from 12 to 6 Ma, following middle Miocene transrotation and prior to the modern transpressional regime. Transtension resulted from the releasing bend of the San Gabriel–Chino Hills–Cristianitos fault, which acted as the primary transform boundary in southern California during this episode. Such an interpretation implies that significant transform motion did not occur on the southern San Andreas fault prior to 6 Ma and that the Gulf of California has opened primarily since 6 Ma. We propose a three-stage model for evolution of the Los Angeles basin and vicinity within the evolving transform-fault system: transrotation (18–12 Ma), transtension (12–6 Ma), and transpression (6–0 Ma). Timing of these stages correlates with microplate-capture events, which occurred during conversion from a convergent margin to a transform margin.