COLLABORATIVE RESEARCH: Revised Stratigraphy: Geochemical Fingerprinting, Paleomagnetism and 40Ar/39Ar Dating, Olduvai Gorge, Tanzania

合作研究：修订地层学：地球化学指纹、古地磁和 40Ar/39Ar 测年，坦桑尼亚奥杜瓦伊峡谷

• 批准号: 9905383
• 负责人: Carl Swisher
• 金额: $ 9.91万
• 依托单位: Berkeley Geochronology Center
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9905383&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Revised; Stratigraphy; Geochemical

9905383SwisherOlduvai Gorge incises the Serengeti Plain of northern Tanzania and exposes a 25 kilometer-long window into the Plio-Pleistocene continental record of east Africa. The exposed continuous two million year paleoenvironmental history contains an extensive vertebrate record (including hominids) and a rich cultural record of central importance in the study of human evolution. Important correlation problems discovered during recent work in the Gorge can be resolved by using field stratigraphic measurements combined with geochemical "fingerprinting" of tuffs to constrain radiometric and paleomagnetic dating. The product of a single volcanic eruption, in theory, has unique chemical characteristics and provides an isochronous marker. Each tuff can be "geochemically fingerprinted" using mineralogy, and major, minor, and trace element abundances data for individual glass shards and then 40Ar/39Ar dated using potassium-rich individual feldspar crystals. The paleomagnetic record will provide an independent verification of our correlations. The combined data set will provide the crucial chronological framework for interpreting the local record and correlating with global environmental, paleoanthropolgical and paleomagnetic records.

9905383Swisherolduvai峡谷切开了坦桑尼亚北部的Serengeti平原，并将长25公里的窗户公开进入东非的Plio-Pleistecene Continental Record。 裸露的200百万年古环境历史包含广泛的脊椎动物记录（包括人类），并且在人类进化研究中具有丰富的文化记录。可以通过使用现场地层测量与凝灰岩的地球化学“指纹”结合来限制辐射测定和古磁性约会的地球化学“指纹”，可以解决峡谷最近在峡谷中发现的重要相关问题。从理论上讲，单个火山喷发的产物具有独特的化学特性，并提供了等距标记。每个凝灰岩可以使用矿物学以及单个玻璃碎片的主要，次要和微量元素丰度数据进行“地球指纹”，然后使用富含钾的单个长石晶体进行的40AR/39AR。古磁记录将对我们的相关性提供独立的验证。组合的数据集将提供关键的时间顺序框架，以解释本地记录，并与全球环境，古人类政治和古磁记录相关。