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首页> 外文期刊>Quaternary geochronology >Reprint of Glass compositions and tempo of post-17 ka eruptions from the Afar Triangle recorded in sediments from lakes Ashenge and Hayk, Ethiopia
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Reprint of Glass compositions and tempo of post-17 ka eruptions from the Afar Triangle recorded in sediments from lakes Ashenge and Hayk, Ethiopia

机译：从埃塞俄比亚湖泊和哈耶克的沉积物中记录了17 ka爆发后17 ka爆发的玻璃组成和速度的转载

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Numerous volcanoes in the Afar Triangle and adjacent Ethiopian Rift Valley have erupted during the Quaternary, depositing volcanic ash (tephra) horizons that have provided crucial chronology for archaeological sites in eastern Africa. However, late Pleistocene and Holocene tephras have hitherto been largely unstudied and the more recent volcanic history of Ethiopia remains poorly constrained. Here, we use sediments from lakes Ashenge and Hayk (Ethiopian Highlands) to construct the first <17 cal ka BP tephrostratigraphy for the Afar Triangle. The tephra record reveals 21 visible and crypto-tephra layers, and our new database of major and trace element glass compositions will aid the future identification of these tephra layers from proximal to distal locations. Tephra compositions include comendites, pantellerites and minor peraluminous and metaluminous rhyolites. Variable and distinct glass compositions of the tephra layers indicate they may have been erupted from as many as seven volcanoes, most likely located in the Afar Triangle. Between 15.3-1.6 cal. ka BP, explosive eruptions occurred at a return period of <1000 years. The majority of tephras are dated at 7.5-1.6 cal. ka BP, possibly reflecting a peak in regional volcanic activity. These findings demonstrate the potential and necessity for further study to construct a comprehensive tephra framework. Such tephrostratigraphic work will support the understanding of volcanic hazards in this rapidly developing region. (C) 2016 The Author(s). Published by Elsevier B.V.
机译：在远程三角形和相邻的埃塞俄比亚裂谷中的许多火山已经在第四纪，沉积了对非洲东非的考古遗址至关重要的年代学的火山灰（Tephra）视野。然而，已故的更新世和全新世Tephras迄今为止，大大难以置信，最近的埃塞俄比亚火山历史仍然受到严重的限制。在这里，我们使用湖泊和埃塞普（埃塞俄比亚高地）的沉积物来构建远程三角形的第一个<17 Cal Ka BP Tephrostratigraphy。 Tephra记录揭示了21个可见和加密Tephra层，我们的新数据库和微量元素玻璃组合物数据库将有助于将这些Tephra层的未来识别从近端到远端位置。 Tephra组合物包括元素，易食癖和轻微的灭菌和金属菱形。 Tephra层的可变和不同的玻璃组成表明它们可能已从多达七个火山中爆发，最可能位于远程三角形。 15.3-1.6 Cal之间。 KA BP，爆炸性爆发发生在<1000年的返回期。大多数Tephras在7.5-1.6 Cal时期。 KA BP，可能反映了区域火山活动的峰值。这些调查结果表明了进一步研究构建综合Tepharra框架的潜在和必要性。这种TephroStratigraphic作品将支持对这一迅速发展中国家的火山危害的理解。 （c）2016年作者。 elsevier b.v出版。

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