最上层的Ndutu床的年龄深度模型限制了中石器时代技术和气候诱导的奥尔杜瓦伊峡谷 (坦桑尼亚) 的古环境变化
Rachel K Smedley1, Kaja Fenn1, Ian G Stanistreet2
1Department of Geography and Planning, University of Liverpool, Liverpool, L69 7ZT, UK.
Journal of human evolution
|December 8, 2023
概括
这项研究为奥尔杜瓦伊峡谷的恩杜图床提供了新的高分辨率约会,这对了解早期人类进化至关重要. 这些发现揭示了与地质和气候变化相关的沉积率变化.
科学领域:
- 古人类学和四季地质学.
- 人类进化研究 人类进化研究
- 考古遗址约会时间 考古遗址约会时间
背景情况:
- 奥尔杜瓦伊峡谷是联合国教科文组织世界遗产,对于理解人类进化至关重要.
- 恩杜图床包含早期的智人遗骸和中石器时代的技术.
- 之前的Ndutu床的约会是不准确的,限制了古老环境的背景.
研究的目的:
- 为了建立一个高分辨率的年龄深度模型的Ndutu和Naisiusiu床在Olduvai峡谷.
- 为了更好地限制临界古环境重建的沉积时间.
- 调查影响奥尔杜瓦伊盆地的人类进化的古环境因素.
主要方法:
- 从奥尔杜瓦伊峡谷化项目收集了15个沉积核心样本.
- 应用光测年技术来确定样本年龄.
- 利用贝叶斯统计来创建一个精细的年龄深度模型.
主要成果:
- 约定Ndutu床在117.1±17.9和45.3±4.2ka之间 (建模年龄:125.9±26.5到45.8±8.2ka).
- 在23.7±10.9和12.1±1.7ka之间测定了上面的Naisiusiu床的日期 (建模年龄:25.7±18.9至12.0±3.4ka).
- 确定了沉积物积累速度的三个不同的阶段,在62.7 ± 5.7 ka.之后显著减少.
结论:
- 新时代模型显著改善了ndutu床的时间控制.
- 积累速度的变化表明与Olbalbal低谷的沉降和气候变化的联系.
- 这种精细的时间线增强了我们对奥尔杜瓦伊峡谷早期人类进化过程中的古环境条件的理解.
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