期刊
FRONTIERS IN EARTH SCIENCE
卷 10, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/feart.2022.799097
关键词
East Africa rift system; oligocene; hominid evolution; stratigraphy; geochronology; Turkana basin; Turkana depression
资金
- Turkana Basin Institute Research Fund
- NSF EAR [202166, 2021579]
- Leakey Foundation
- NSF BCS [2124791]
- Direct For Social, Behav & Economic Scie
- Division Of Behavioral and Cognitive Sci [2124791] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [2021579] Funding Source: National Science Foundation
New field observations and geochronology have revealed that the Topernawi Formation in the Ekitale Basin of northern Turkana Depression in Kenya is the oldest dated syn-rift sedimentary unit from the Oligocene.
New field observations and 40Ar/39Ar geochronology reveal that the Topernawi Formation of the Ekitale Basin, northern Turkana Depression, Turkana County, Kenya was deposited entirely during the Oligocene between 29.7 +/- 0.5 Ma and 29.24 +/- 0.08 Ma. These bracketing ages are determined via new 40Ar/39Ar geochronology on a basaltic lava flow at the base of the section and a felsic ignimbrite near the top. A newly discovered basal unit and interbedded lava flow result in a new total sedimentary thickness of 92 m. The Topernawi Formation is the oldest dated syn-rift sedimentary section in the northern Turkana Depression.
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