TY - JOUR
T1 - Generating long chronologies for lacustrine sediments using luminescence dating
T2 - A 250,000 year record from Lake Tana, Ethiopia
AU - Roberts, Helen M.
AU - Bryant, Charlotte L.
AU - Huws, Dei
AU - Lamb, Henry
N1 - Funding Information:
This work was undertaken as part of Natural Environment Research Council grant no. NE/DO12996/1 , and with NERC Radiocarbon Facility support ( NRCF010001 allocation number 1201.1006). The 2004 and 2006 seismic surveys were conducted by Richard Bates (University of St. Andrews) and D.G.H. (Bangor University), funded by NERC grants NER/B/S/2002/00540 and NER/B/S/2002/00540 . Core retrieval was undertaken by. H.F.L., Sarah Davies, Mike Marshall, and Harry Toland, (all Aberystwyth University), with scientific and logistical support from members of the Department of Earth Sciences at Addis Ababa University, especially the late Mohammed Umer; Addis Zeleke of Addis Geosystems plc; the Amhara Region Agricultural Research Institute. ICP measurements were conducted by J.N. Walsh (Royal Holloway University, London). Antony Smith (Aberystwyth University) is thanked for production of the location map, Fig. 1 . Two anonymous reviewers are thanked for their helpful comments on the manuscript.
Funding Information:
This work was undertaken as part of Natural Environment Research Council grant no. NE/DO12996/1, and with NERC Radiocarbon Facility support (NRCF010001 allocation number 1201.1006). The 2004 and 2006 seismic surveys were conducted by Richard Bates (University of St. Andrews) and D.G.H. (Bangor University), funded by NERC grant NER/B/S/2002/00540. Core retrieval was undertaken by. H.F.L., Sarah Davies, Mike Marshall, and Harry Toland, (all Aberystwyth University), with scientific and logistical support from members of the Department of Earth Sciences at Addis Ababa University, especially the late Mohammed Umer; Addis Zeleke of Addis Geosystems plc; the Amhara Region Agricultural Research Institute. ICP measurements were conducted by J.N. Walsh (Royal Holloway University, London). Antony Smith (Aberystwyth University) is thanked for production of the location map, Fig. 1. Two anonymous reviewers are thanked for their helpful comments on the manuscript.
Funding Information:
This work was undertaken as part of Natural Environment Research Council grant no. NE/DO12996/1, and with NERC Radiocarbon Facility support (NRCF010001 allocation number 1201.1006). The 2004 and 2006 seismic surveys were conducted by Richard Bates (University of St. Andrews) and D.G.H. (Bangor University), funded by NERC grants NER/B/S/2002/00540 and NER/B/S/2002/00540. Core retrieval was undertaken by. H.F.L., Sarah Davies, Mike Marshall, and Harry Toland, (all Aberystwyth University), with scientific and logistical support from members of the Department of Earth Sciences at Addis Ababa University, especially the late Mohammed Umer; Addis Zeleke of Addis Geosystems plc; the Amhara Region Agricultural Research Institute. ICP measurements were conducted by J.N. Walsh (Royal Holloway University, London). Antony Smith (Aberystwyth University) is thanked for production of the location map, Fig. 1. Two anonymous reviewers are thanked for their helpful comments on the manuscript.
Publisher Copyright:
© 2018 The Authors
PY - 2018/12/15
Y1 - 2018/12/15
N2 - The lakes of the eastern Africa Rift often contain great thicknesses of sediment that may provide continuous records of environmental change over decadal to million-year timescales. However interpretation of these changes is greatly compromised without a reliable chronology. Luminescence dating has not been used extensively in lacustrine settings; instead previous studies have often relied upon radiocarbon dating, using extrapolation beyond the upper limit of that technique, and employing opportunistic sampling of tephra and palaeomagnetic signatures where possible. This study from Lake Tana, Ethiopia, demonstrates that recent advances in luminescence methodology can provide long chronologies for lake sediments that are not dependent on the intermittent presence of dateable material, as is the case for radiocarbon and tephra-based methods. Specifically, this study generates luminescence ages that agree with independent chronology based on radiocarbon dating in the upper part of the core, and extends significantly beyond the range of radiocarbon dating to provide one of the longest independently dated lacustrine sediment records in eastern Africa, thus demonstrating the tremendous potential of luminescence for constructing lacustrine sediment chronologies over 100,000 year timescales
AB - The lakes of the eastern Africa Rift often contain great thicknesses of sediment that may provide continuous records of environmental change over decadal to million-year timescales. However interpretation of these changes is greatly compromised without a reliable chronology. Luminescence dating has not been used extensively in lacustrine settings; instead previous studies have often relied upon radiocarbon dating, using extrapolation beyond the upper limit of that technique, and employing opportunistic sampling of tephra and palaeomagnetic signatures where possible. This study from Lake Tana, Ethiopia, demonstrates that recent advances in luminescence methodology can provide long chronologies for lake sediments that are not dependent on the intermittent presence of dateable material, as is the case for radiocarbon and tephra-based methods. Specifically, this study generates luminescence ages that agree with independent chronology based on radiocarbon dating in the upper part of the core, and extends significantly beyond the range of radiocarbon dating to provide one of the longest independently dated lacustrine sediment records in eastern Africa, thus demonstrating the tremendous potential of luminescence for constructing lacustrine sediment chronologies over 100,000 year timescales
KW - Direct dating
KW - Lacustrine sediments
KW - Luminescence dating
KW - OSL
KW - Palaeolimnology
KW - Polymineral fine-grains
KW - Post-IR IRSL signal
KW - Radiocarbon
UR - http://www.scopus.com/inward/record.url?scp=85056573397&partnerID=8YFLogxK
U2 - 10.1016/j.quascirev.2018.10.037
DO - 10.1016/j.quascirev.2018.10.037
M3 - Article
SN - 0277-3791
VL - 202
SP - 66
EP - 77
JO - Quaternary Science Reviews
JF - Quaternary Science Reviews
ER -
