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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Constraints on the post-25-ka slip rate of the Yammouneh fault (Lebanon) using in situ cosmogenic Cl-36 dating of offset limestone-clast fans
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Constraints on the post-25-ka slip rate of the Yammouneh fault (Lebanon) using in situ cosmogenic Cl-36 dating of offset limestone-clast fans

机译：使用原位宇宙成因Cl-36年代的偏移石灰石-碎屑扇对Yammouneh断层（黎巴嫩）25ka后滑动速率的约束

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摘要

The most active seismogenic structure along the eastern shore of the Mediterranean is the N-S-trending left-lateral Levant Fault System (LFS), the plate boundary between Arabia and Africa. In Lebanon, it forms a 160-km-long restraining bend responsible for the uplift of Mount Lebanon. The resulting transpression is partitioned between the offshore Tripoli-Roum thrust and the Yammo (u) over cap neh strike-slip fault. There are few quantitative constraints on the Quaternary slip rate along the LFS. Here we present a direct estimate of the similar to25-ka mean slip rate on the Yammo (u) over cap neh fault. Mapped offsets of alluvial fans at two sites similar to50 km apart on the eastern flank of Mount Lebanon range between 24+/-2 and 80 8 in. About 30 limestone cobbles sampled on these fans yield in situ cosmogenic Cl-36 exposure ages mostly between 6 and 27 ka. A statistical assessment of offsets versus ages provides bounds on the Late Pleistocene-Holocene slip rate on the fault: 3.8-6.4 mm/yr. These results are consistent with long-term geological inferences, continuing that the Yammo (u) over cap neh fault is the main strike-slip branch of the LFS in Lebanon. They illustrate both the potential and the difficulties of using in situ cosmogenic Cl-36 dating of Iimestone-clast fan deposits for deciphering tectonic and geomorphic processes in the Mediterranean. (C) 2004 Published by Elsevier B.V.
机译：地中海东部沿岸最活跃的地震发生结构是北南北向趋势的黎凡特断层系统（LFS），即阿拉伯和非洲之间的板块边界。在黎巴嫩，它形成了一个160公里长的约束弯道，负责黎巴嫩山的隆起。由此产生的压裂作用在海底的黎波里-鲁姆逆冲断层和Yammo（u）跨盖尼赫走滑断层之间分配。沿LFS的第四纪滑移率几乎没有定量限制。在这里，我们对Yammo（u）上盖尼赫断层的近似25-ka平均滑移率进行直接估算。黎巴嫩山东部侧面相距50公里的两个地点的冲积扇的偏移距在24 +/- 2到80 8英寸之间。在这些扇上采样到的大约30个石灰石卵石产生的原位宇宙成因Cl-36暴露年龄主要在6和27 ka。偏移量与年龄的统计评估提供了断层上晚更新世-全新世滑移率的界限：3.8-6.4 mm / yr。这些结果与长期的地质推断是一致的，并继续认为，盖尼赫断层上方的Yammo（u）是黎巴嫩LFS的主要走滑分支。他们说明了利用原位宇宙成因的Iimestone-Clast扇形沉积物进行Cl-36测年来解释地中海的构造和地貌过程的潜力和困难。 （C）2004由Elsevier B.V.发布

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