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The Amik Lake in Southern Turkey over the last 4000 years, a new paleoseismological record of ruptures along the Northern Dead Sea Fault

机译:在过去的4000年中,土耳其南部的阿米克湖成为新的古地震学记录,记录了北部死海断裂带的破裂情况

摘要

The study focuses on the sedimentary record of the Amik Lake occupying the central part of a pull-apart basin. The Basin is crossed by The Dead Sea Fault (DSF), a major neotectonic structure in the Middle East extending from the Red Sea in the south to the East Anatolian Fault Zone in the north. Around the Amik Basin, continuous human occupation is attested since 6000-7000 BC. Indeed the low-lying Amuq plain is covered by tell settlements first explored by Robert Braidwood in the 1930s. Our objective in this presentation is to look at major paleo-environmental changes recorded in the Amik Lake over the last 4000 years and in particular its potential paleoseimic sedimentary record. The lake has been drained and progressively dried up since the mid-50s so that it is not watered during the summer season and constitutes a unique opportunity to collect sediment records. Sediments were collected at 1 cm to 2 cm intervals in a trench and in cores up to a depth of 5 meters in the clay deposits. A diverse array of complementary methods is applied to study the records: magnetic susceptibility, grain size, organic matter and inorganic carbon (L.O.I), XRD mineralogy, XRF geochemistry, carbon geochemistry and clay mineralogy. The age of the record is constrained combining radionuclide and radiocarbon dating. The sedimentary record shows large earthquake related structural disturbances and smaller siliciclastic sedimentary events. The siliciclastic input would be related to enhanced detritical sedimentation related to earthquake shaking. The latter is further investigated looking at intensities and shake maps related to the last 19th century M>7 earthquakes in the area and landslide prone area in the lake catchment.
机译:该研究的重点是阿米克湖(Amik Lake)在拉拉盆地中心的沉积记录。该盆地与死海断层(DSF)交叉,死海断层是中东的一个主要新构造构造,从南部的红海延伸到北部的东安纳托利亚断层带。自公元前6000-7000年以来,在Amik盆地周围,一直有人持续占领。确实,低洼的阿穆克平原被罗伯特·布雷德伍德(Robert Braidwood)在1930年代首次探索的定居点所覆盖。我们在这次报告中的目的是研究近4000年来Amik湖记录的主要古环境变化,尤其是其潜在的古近纪沉积记录。自上世纪50年代中期以来,该湖已被排干并逐渐干dried,因此夏季不浇水,这是收集沉积物记录的独特机会。在沟渠和岩心中以1 cm至2 cm的间隔收集沉积物,直到粘土沉积物深达5米。应用了多种辅助方法来研究记录:磁化率,粒度,有机物和无机碳(L.O.I),XRD矿物学,XRF地球化学,碳地球化学和粘土矿物学。记录的年龄受放射性核素和放射性碳测年的约束。沉积记录表明,与地震有关的结构扰动较大,而硅质碎屑沉积事件较小。硅质碎屑输入将与与地震震动有关的增强的碎屑沉积有关。对后者进行了进一步的研究,以查看与该流域和滑坡易发地区最近19世纪M> 7地震有关的强度和震动图。

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