Paleoclimate of the past 4000 years at Lake Turkana, Kenya, based on the isotopic composition of authigenic calcite

T. C. Johnson; John D. Halfman; W. J. Showers

doi:10.1016/0031-0182(91)90158-N

Paleoclimate of the past 4000 years at Lake Turkana, Kenya, based on the isotopic composition of authigenic calcite

T. C. Johnson, John D. Halfman, W. J. Showers

Continental Scientific Drilling Facility

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

Authigenic calcite was analyzed for δ¹³C and δ¹⁸O in a 12 m long core from Lake Turkana that spans the last 4200 yr. The δ¹⁸O record is interpreted to reflect lake level history, and indicates high stands prior to 4000 yr B.P., from 1800 to 2000 yr B.P., and within the last century. This coincides better with the history of lake level change reported for other lakes in africa than did the previous lake level curve for Lake Turkana based on ¹⁴C dates of exposed shoreline deposits. The δ¹³C curve roughly parallels the δ¹⁸O curve, and may reflect the influence of the Omo River plume. Both of the isotope records are strongly cyclic, with periodicites common to both at 80, 120, 150 and 225 yr. Other, somewhat longer periodicites are nearly equal in the two records, and there is close agreement with previously published cycles based on carbonate and lamination thickness analyses in the same Turkana core.

Original language	English (US)
Pages (from-to)	189-198
Number of pages	10
Journal	Palaeogeography, Palaeoclimatology, Palaeoecology
Volume	85
Issue number	3-4
DOIs	https://doi.org/10.1016/0031-0182(91)90158-N
State	Published - Jun 1991

Bibliographical note

Funding Information:
We thank G. Lister and K. Ghilardi, along with the crew' of the R/V HALCYON, for their assistance in obtaining the piston cores from Lake Turkana in 1984. We greatly benefitted from the unpublished isotopic data provided by T. Cerling. T. Hagelburg and N. Pisias were very helpful in updating our methods of time-series analysis. M. Talbot and T. Cerling provided useful comments on earlier drafts of this manuscript. Funding was provided by Project PROBE of Duke University under the direction of B. R. Rosendahl for the field work, U.S.A.I.D. Grant DPE-5542-G-SS-6030-00 and NSF Grant ATM-8715642 to TCJ.

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Copyright 2014 Elsevier B.V., All rights reserved.

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title = "Paleoclimate of the past 4000 years at Lake Turkana, Kenya, based on the isotopic composition of authigenic calcite",

abstract = "Authigenic calcite was analyzed for δ13C and δ18O in a 12 m long core from Lake Turkana that spans the last 4200 yr. The δ18O record is interpreted to reflect lake level history, and indicates high stands prior to 4000 yr B.P., from 1800 to 2000 yr B.P., and within the last century. This coincides better with the history of lake level change reported for other lakes in africa than did the previous lake level curve for Lake Turkana based on 14C dates of exposed shoreline deposits. The δ13C curve roughly parallels the δ18O curve, and may reflect the influence of the Omo River plume. Both of the isotope records are strongly cyclic, with periodicites common to both at 80, 120, 150 and 225 yr. Other, somewhat longer periodicites are nearly equal in the two records, and there is close agreement with previously published cycles based on carbonate and lamination thickness analyses in the same Turkana core.",

author = "Johnson, {T. C.} and Halfman, {John D.} and Showers, {W. J.}",

note = "Funding Information: We thank G. Lister and K. Ghilardi, along with the crew' of the R/V HALCYON, for their assistance in obtaining the piston cores from Lake Turkana in 1984. We greatly benefitted from the unpublished isotopic data provided by T. Cerling. T. Hagelburg and N. Pisias were very helpful in updating our methods of time-series analysis. M. Talbot and T. Cerling provided useful comments on earlier drafts of this manuscript. Funding was provided by Project PROBE of Duke University under the direction of B. R. Rosendahl for the field work, U.S.A.I.D. Grant DPE-5542-G-SS-6030-00 and NSF Grant ATM-8715642 to TCJ. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",

year = "1991",

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doi = "10.1016/0031-0182(91)90158-N",

language = "English (US)",

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pages = "189--198",

journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",

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PY - 1991/6

Y1 - 1991/6

N2 - Authigenic calcite was analyzed for δ13C and δ18O in a 12 m long core from Lake Turkana that spans the last 4200 yr. The δ18O record is interpreted to reflect lake level history, and indicates high stands prior to 4000 yr B.P., from 1800 to 2000 yr B.P., and within the last century. This coincides better with the history of lake level change reported for other lakes in africa than did the previous lake level curve for Lake Turkana based on 14C dates of exposed shoreline deposits. The δ13C curve roughly parallels the δ18O curve, and may reflect the influence of the Omo River plume. Both of the isotope records are strongly cyclic, with periodicites common to both at 80, 120, 150 and 225 yr. Other, somewhat longer periodicites are nearly equal in the two records, and there is close agreement with previously published cycles based on carbonate and lamination thickness analyses in the same Turkana core.

AB - Authigenic calcite was analyzed for δ13C and δ18O in a 12 m long core from Lake Turkana that spans the last 4200 yr. The δ18O record is interpreted to reflect lake level history, and indicates high stands prior to 4000 yr B.P., from 1800 to 2000 yr B.P., and within the last century. This coincides better with the history of lake level change reported for other lakes in africa than did the previous lake level curve for Lake Turkana based on 14C dates of exposed shoreline deposits. The δ13C curve roughly parallels the δ18O curve, and may reflect the influence of the Omo River plume. Both of the isotope records are strongly cyclic, with periodicites common to both at 80, 120, 150 and 225 yr. Other, somewhat longer periodicites are nearly equal in the two records, and there is close agreement with previously published cycles based on carbonate and lamination thickness analyses in the same Turkana core.

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ER -

Paleoclimate of the past 4000 years at Lake Turkana, Kenya, based on the isotopic composition of authigenic calcite

Abstract

Bibliographical note

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