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首页> 外文期刊>Marine Geology >Sedimentation processes in the Eastern Mediterranean Sea during the Late Glacial and Holocene revealed by end-member modelling of the terrigenous fraction in marine sediments
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Sedimentation processes in the Eastern Mediterranean Sea during the Late Glacial and Holocene revealed by end-member modelling of the terrigenous fraction in marine sediments

机译：末期冰期和全新世期间东地中海的沉积过程通过海洋沉积物中陆源部分的末端成员模拟揭示

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摘要

We present grain-size distributions of the terrigenous fraction of two sediment cores from the southeast Levantine Sea (SL112) and the northern Aegean Sea (SL148), spanning the time interval from the late glacial to the present. End-member modelling of the grain-size distribution allows discriminating between aeolian and fluvial transport of the sediments and helps to infer palaeoenvironmental conditions in the source areas. Sedimentary and depositional processes during the late glacial and Holocene were controlled by climatic variations of both the northern high latitudes and the African climate system. The sedimentation at site SL112 off Israel is dominated by the suspension load of the River Nile and aeolian dust from the Sahara. Variations in grain size reflect the early to mid-Holocene climate transition from the African Humid Period to recent arid conditions. This climate change was gradual, in contrast to the abrupt humidity change documented in Western Saharan records. This implies a successive decrease in Nile river sediment supply due to a step-wise aridification of the headwaters. The grain-size data of SL112 show a humidity maximum at 5 kyr BP coincident with a regionally-restricted wet phase in the Levantine Sea. The sediments at the North Aegean site SL148 consist of riverine particles and low amounts of aeolian dust, probably derived from South European sources and with probably minor Saharan influence. The sedimentation processes are controlled by climate conditions being characterized by enhanced deposition of dust during the cold and dry glacial period and by decreased aeolian influx during the temperate and humid Holocene.
机译：我们介绍了东南黎凡特海（SL112）和爱琴海北部（SL148）的两个沉积物岩心的陆源部分的粒度分布，其范围从冰川晚期到现在。颗粒大小分布的最终成员建模可以区分沉积物的风成和河流运移，并有助于推断出源区的古环境条件。冰川和全新世晚期的沉积和沉积过程受北部高纬度地区和非洲气候系统的气候变化控制。以色列以外的SL112站点的沉积物主要由尼罗河的悬浮负荷和撒哈拉沙漠的风尘组成。晶粒尺寸的变化反映了从非洲湿润期到最近干旱条件的全新世早期到中期的气候过渡。与西撒哈拉记录中突然出现的湿度变化相反，这种气候变化是渐进的。这意味着由于上游水源的逐步干旱，尼罗河的沉积物供应量连续减少。 SL112的粒度数据显示在5 kyr BP时的最大湿度与黎凡特海的区域限制湿相相吻合。北爱琴海站点SL148的沉积物由河流颗粒和少量的风尘组成，可能来自南欧，可能对撒哈拉的影响较小。沉积过程受气候条件控制，其特征是在寒冷和干燥的冰川时期尘埃沉积增加，而在温带和潮湿的全新世期间风沙潮减少。

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