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首页> 外文期刊>Geology >Footwall drainage evolution and scarp retreat in response to increasing fault displacement: Loreto fault, Baja California Sur, Mexico
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Footwall drainage evolution and scarp retreat in response to increasing fault displacement: Loreto fault, Baja California Sur, Mexico

机译：断层位移增加，下盘排水演化和断层退缩：墨西哥下加利福尼亚州洛雷托断层

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摘要

The displacement rate history of the Loreto fault, Gulf of California, is well documented; it is characterized by episodically accelerating displacement (10 k.y. frequency) superimposed upon a period of 200 k.y. of increasing fault displacement rate. A detailed conglomerate provenance analysis in the Loreto basin records the footwall unroofing history, which has been profoundly affected by increased fault displacement rate. Clast count data capture an immediate drainage response to a significant increase in slip rate, along with the occurrence and systematic increase in abundance of a new source rock type. Our data record an increase in the rate of incision and catchment expansion associated with this increase in displacement rate. A provenance signal from a shorter-term (100 k.y.) displacement rate increase has a 30–40 k.y. lag time. No change in provenance is recorded for high-frequency (10 k.y.) variations, which are filtered out by the system.
机译：加利福尼亚湾洛雷托断层的位移速率历史已得到充分记录。它的特点是在200 k.y的周期上叠加了位移加速（频率为10 k.y.）。故障位移率的增加。在洛雷托盆地进行的详细的集团物源分析记录了下盘顶盖的历史，该历史已受到断层位移速率增加的深远影响。碎屑计数数据捕获了对滑移率显着增加的立即排水反应，以及新烃源岩类型的发生和系统丰度的增加。我们的数据记录了与位移率增加相关的切口和集水区扩张率的增加。来自短期（100 k.y.）位移速率增加的出处信号具有30-40k.y。时差。没有记录高频（10 k.y.）变化的出处变化，这些变化会被系统滤除。

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