利用放射性测年、磁地层学和温度地层学来校准东非裂谷的古人类进化速率

IF 2.2 2区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Elements Pub Date : 2023-04-01 DOI:10.2138/gselements.19.2.88

A. Deino, L. Gibert, C. Vidal

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引用次数: 0

摘要

东非大裂谷中人类化石和人工制品的年龄校准主要通过相关火山沉积地层的年代测定来实现。≳100 ka遗址的主要测年技术是40Ar/39Ar辐射测年法、磁地层学和温压地层学。40Ar/39Ar技术依赖于目标地层中火山沉积物的出现，这些沉积物通常是裂谷形成和火山活动相互作用的结果。可数据材料的频率可能是有限的；然而，通过对这些地层应用磁地层学和火成地层学的相关测年方法，可以建立一个年代地层格架，并将其应用于含化石地层。本章提供了这些技术在坦桑尼亚奥尔杜瓦伊峡谷和埃塞俄比亚东非大裂谷两个地区的应用实例。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Using Radiometric Dating, Magnetostratigraphy, and Tephrostratigraphy to Calibrate Rates of Hominin Evolution in the East African Rift

Age-calibration of hominin fossils and artifacts in the East African Rift is principally achieved through dating of associated volcanic-sedimentary strata. The dominant dating techniques for sites ≳100 ka are the 40Ar/39Ar radiometric dating method, magnetostratigraphy, and tephrostratigraphy. The 40Ar/39Ar technique relies on the occurrence of volcanic deposits in the target strata, which are often present as a consequence of the interplay of rift formation and volcanic activity. The frequency of datable material may be limited; however, by also applying the relative dating methods of magnetostratigraphy and tephrostratigraphy to these same strata, a chronostrati-graphic framework can be built and applied to fossiliferous strata. This chapter provides examples of the application of these techniques at Olduvai Gorge, Tanzania, and two areas of the East African Rift in Ethiopia.

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来源期刊

Elements 地学-地球化学与地球物理

CiteScore

7.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Elements is an international magazine of mineralogy, petrology, and geochemistry. Published bimonthly, every issue explores a theme of broad and current interest. Elements publishes invited peer-reviewed articles for each thematic collection of papers. Topics of interest can be proposed to the editors who will review every proposal submitted. Elements also presents regular features including a opinion articles, calendar of events, short course announcements, awards, conference reports, policy news, as well as news of the 18 participating societies.