Low Lake Stands in Lakes Malawi and Tanganyika, East Africa, Delineated with Multifold Seismic Data
Low Lake Stands in Lakes Malawi and Tanganyika, East Africa, Delineated with Multifold Seismic Data
复制标题
用多重地震数据描绘了东非马拉维湖和坦噶尼喀湖的低湖
作者：
C. Scholz;B. Rosendahl
地震数据显示，大约 25,000 年前，东非马拉维湖的水位下降了 250 至 500 米。当时坦噶尼喀湖的水位比现在的湖水位低600多米。干燥的气候似乎造成了这些低位，但构造倾斜也可能是马拉维湖的一个促成因素。与浅层层序边界相关的高角度不一致表明，这些低位可能持续了数万年。由于其基底地形，坦噶尼喀湖盆地拥有三个独立的古湖泊，而马拉维湖盆地只有一个。这些古湖泊的不同地理位置可能是造成这些湖泊特有鱼类种群差异的部分原因。
Seismic data reveal that water level in Lake Malawi, East Africa, was 250 to 500 meters lower before about 25,000 years ago. Water levels in Lake Tanganyika at that time were more than 600 meters below the current lake level. A drier climate appears to have caused these low stands, but tectonic tilting may also have been a contributing factor in Lake Malawi. High-angle discordances associated with shallow sequence boundaries suggest that these low stands probably lasted many tens of thousands of years. Because of its basement topography, the Lake Tanganyika basin had three separate paleolakes, whereas the Lake Malawi basin had only one. The different geographies of these paleolakes may be responsible in part for the differences in the endemic fish populations in these lakes.