Former Lake Levels and Climatic Change in the Rift Valley of Southern Ethiopia
Former Lake Levels and Climatic Change in the Rift Valley of Southern Ethiopia
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埃塞俄比亚南部裂谷的前湖水位和气候变化
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
A. Goudie
中科院分区：
文献类型：
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作者：
A. T. Grove;F. Street;A. Goudie
埃塞俄比亚裂谷中的湖泊是晚第四纪气候的敏感指标。Stefanie湖（Chew Bahir）在本世纪的大部分时间里都是干涸的，它在5660年前的深度为20米。它从阿巴亚湖和查莫湖流出，可能在当时流入鲁道夫湖，是尼罗河系统的一部分。四个加拉湖，Ziway, Langano， Abiyata和Shala，在晚更新世/全新世早期被合并成一个大湖，流入阿瓦什河。海滩沉积物含有亚化石软体动物，其中一些具有古北界的特征。在离沙拉湖几米高的床上，在硅藻湖底沉积物之间，有大量的鱼残骸。Barbus的一种形式出现，类似于北非的B. callensis。介绍了Stefanie湖和Galla湖盆地的藻灰岩，并讨论了它们的意义。
Lakes in the Ethiopian rift are sensitive indicators of Late Quaternary climates. Lake Stefanie (Chew Bahir), which has been dry most of this century, was 20 m deep about 5660 years ago. Fed from Lakes Abaya and Chamo it probably over flowed to Lake Rudolf at that time and was a part of the Nile system. The four Galla lakes, Ziway, Langano, Abiyata and Shala, were united into one large lake which bverflowed to the Awash River in the Late Pleistocene/Early Holocene. Beach deposits contain sub-fossil mollusca, some of which have Palaearctic afnnities. Fish remains are abundant in a bed a few metres above Lake Shala between diatomaceous lake floor deposits. A form of Barbus occurs which resembles the North African B. callensis. Algal limestones from Stefanie and the Galla lakes basin are described and their significance discussed.