Stratigraphic Evolution of the Turkana Basin, Kenya and Ethiopia

图尔卡纳盆地、肯尼亚和埃塞俄比亚的地层演化

• 批准号: 9117956
• 负责人: Craig Feibel
• 金额: $ 11.47万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-15 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117956&HistoricalAwards=false
• 关键词: Stratigraphic; Evolution; Turkana; Basin; Kenya

The Turkana Basin of Kenya and Ethiopia has long been known as a critical locality for the understanding of vertebrate evolution in East Africa. The geologic record of the basin spans a broad range, including Cretaceous through Holocene sediments with intercalated volcanics. Cretaceous through Oligocene history has yet to be characterized, but Miocene to Holocene strata are well- known. They record the stratigraphic evolution of the basin from a volcanically active, localized sediment trap, to an integrated fluvial basin with periodic lacustrine phases, and finally to a structurally-controlled rift basin. Research over the past decade on the context of vertebrate evolution in the basin has greatly altered our perspective on the history of the region and development of the East African Rift. Within the stratigraphic and temporal framework established for vertebrate studies, it is now possible to examine in detail the evolution of the region in terms of its volcanic, tectonic and sedimentary history, and to reevaluate the history of geologic processes in this portion of Africa. We intend to focus our attention on the unstudied southern portion of the Turkana Basin, and to investigate exposures in the Loiyengalani region, the Chalbi Desert, on Mt. Kulal, and in the Suguta and Kerio Valleys. Understanding of the geologic record from these regions is critical to evaluating the history of major geologic events in the basin, including basin integration, hydrographic connections, and structural development.

长期以来，肯尼亚和埃塞俄比亚的图尔卡纳盆地一直是理解东非脊椎动物进化的关键地方。 盆地的地质记录跨越了广泛的范围，包括通过互嵌小火山的全新世沉积物的白垩纪。 通过渐新世历史的白垩纪尚未表征，但中新世至全新世层是众所周知的。 他们记录了盆地从火山活跃的局部沉积物陷阱到具有周期性湖泊相的集成河盆地的地层演化，最后是结构控制的裂谷盆地。 在过去的十年中，关于盆地脊椎动物进化的背景的研究极大地改变了我们对该地区历史和东非裂谷发展的看法。 在为脊椎动物研究建立的地层和时间框架中，现在可以详细研究该地区的火山，构造和沉积历史，并重新评估非洲这一部分地质过程的历史。 我们打算将注意力集中在图尔卡纳盆地的未经研究的南部地区，并调查在库拉尔山上的库尔比沙漠，苏古塔和凯里奥山谷的Loiyengalani地区的暴露。 了解这些区域的地质记录对于评估盆地主要地质事件的历史，包括盆地整合，水文连接和结构发展至关重要。