Universität zu Köln

Martin-Jones, C. M., Lane, C. S., Pearce, N. J. G., Smith, V. C., Lamb, H. F., Oppenheimer, C., Asrat, A. and Schaebitz, F. (2017). Glass compositions and tempo of post-17 ka eruptions from the Afar Triangle recorded in sediments from lakes Ashenge and Hayk, Ethiopia. Quat. Geochronol., 37. S. 15 - 32. OXFORD: ELSEVIER SCI LTD. ISSN 1878-0350

Full text not available from this repository.

Abstract

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, pan-tellerites 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 Authors. Published by Elsevier B.V.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Martin-Jones, C. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lane, C. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pearce, N. J. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, V. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lamb, H. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Oppenheimer, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Asrat, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaebitz, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-241939
DOI:	10.1016/j.quageo.2016.10.001
Journal or Publication Title:	Quat. Geochronol.
Volume:	37
Page Range:	S. 15 - 32
Date:	2017
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1878-0350
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GRANDE-DI-MONTICCHIO; TEPHRA LAYERS; TURKANA-BASIN; RIFT; SEQUENCE; VOLCANO; ISOTOPE; TEPHROCHRONOLOGY; MICROANALYSIS; GEOCHEMISTRY Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24193