Paleolakes of Eastern Africa: Zeolites, Clay Minerals, and Climate
Paleolakes of Eastern Africa: Zeolites, Clay Minerals, and Climate
复制标题
DOI：
10.2138/gselements.19.2.96
复制
发表时间：
2023-04
期刊：
影响因子：
4.5
通讯作者：
L. McHenry;Verena Foerster;D. Gebregiorgis
中科院分区：
文献类型：
--
作者：
L. McHenry;Verena Foerster;D. Gebregiorgis
东非裂谷系的东部分支拥有许多浅的现代湖泊和古湖泊，它们是过去几百万年气候条件变化（因构造而变得复杂）的敏感记录者。然而，许多这样的湖泊是盐碱湖（含盐和高pH值），这些条件不容易保存花粉和其他生物衍生的古气候指标。幸运的是，在这些极端环境中形成的一些保存下来的矿物质反映了湖泊水化学的微妙变化（受气候条件变化的控制），因此提供了当地和区域气候变化的连续记录。我们以两个不同的古湖泊盆地（坦桑尼亚的Olduvai峡谷和埃塞俄比亚的Chew Bahir）的两种不同的矿物代用物（沸石和粘土）为例。
The eastern branch of the East African Rift System hosts many shallow modern lakes and paleolakes, which can be sensitive recorders of changing climate conditions (complicated by tectonics) during the past few million years. However, many of such lakes are saline–alkaline (salty and high pH), and these conditions do not easily preserve pollen and other biologically derived paleoclimate indicators. Fortunately, some preserved minerals that formed in these extreme environments reflect subtle shifts in lake water chemistry (controlled by changes in climate conditions) and therefore provide a continuous record of local and regional climate change. We present two different mineral proxies (zeolites and clays) from two different paleolake basins (Olduvai Gorge, Tanzania, and Chew Bahir, Ethiopia) as examples.