The sedimentary response to a rapid change in lake level in Lake Tanganyika

James McManus, Silke Severmann, Andrew Cohen, Jennifer L. McKay, Bo R. Montanye, Anne M. Hartwell, Rebecca L P Brucker, Robert Wheatcroft

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We present records of sedimentary organic carbon, nitrogen, and carbonate, and stable isotope records of organic material and carbonate from a series of sediment cores that straddle the permanent chemocline in Lake Tanganyika. Sedimentation rates for these cores are consistent among the sites (~0.05-0.1cm y-1), and all records show an increase in sedimentary carbonate (aragonite) content centered at ~1879. The mid-19th century coincides with a major (~10m) lake level transgression. Throughout the period of lake level transgression and subsequent regression, the organic matter δ13C and δ15N records develop a prominent and coincident negative excursion followed by a return to values similar to those prior to the lake level transgression. This negative excursion in δ15N and δ13C is also coincident with an increase in carbonate-corrected organic carbon. We interpret the δ13C results as a decline in primary production during the transgression with the δ15N results signaling a concomitant increase in the reliance on nitrogen fixation as the nitrogen source. The coincident peak in organic carbon is interpreted as being a result of enhanced preservation driven by the precipitation and burial of aragonite.

Original languageEnglish (US)
Pages (from-to)647-658
Number of pages12
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume440
DOIs
StatePublished - Dec 15 2015

Fingerprint

Lake Tanganyika
transgressive segregation
lake level
transgression
carbonates
carbonate
lakes
organic carbon
lake
aragonite
carbon
nitrogen
nitrogen fixation
sedimentation rate
stable isotopes
sediment core
primary production
primary productivity
stable isotope
organic matter

Keywords

  • Geochemistry
  • Lake Tanganyika
  • Little Ice Age
  • Transgression
  • δC
  • δN

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Palaeontology
  • Earth-Surface Processes
  • Oceanography

Cite this

McManus, J., Severmann, S., Cohen, A., McKay, J. L., Montanye, B. R., Hartwell, A. M., ... Wheatcroft, R. (2015). The sedimentary response to a rapid change in lake level in Lake Tanganyika. Palaeogeography, Palaeoclimatology, Palaeoecology, 440, 647-658. https://doi.org/10.1016/j.palaeo.2015.09.035

The sedimentary response to a rapid change in lake level in Lake Tanganyika. / McManus, James; Severmann, Silke; Cohen, Andrew; McKay, Jennifer L.; Montanye, Bo R.; Hartwell, Anne M.; Brucker, Rebecca L P; Wheatcroft, Robert.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 440, 15.12.2015, p. 647-658.

Research output: Contribution to journalArticle

McManus, J, Severmann, S, Cohen, A, McKay, JL, Montanye, BR, Hartwell, AM, Brucker, RLP & Wheatcroft, R 2015, 'The sedimentary response to a rapid change in lake level in Lake Tanganyika', Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 440, pp. 647-658. https://doi.org/10.1016/j.palaeo.2015.09.035
McManus, James ; Severmann, Silke ; Cohen, Andrew ; McKay, Jennifer L. ; Montanye, Bo R. ; Hartwell, Anne M. ; Brucker, Rebecca L P ; Wheatcroft, Robert. / The sedimentary response to a rapid change in lake level in Lake Tanganyika. In: Palaeogeography, Palaeoclimatology, Palaeoecology. 2015 ; Vol. 440. pp. 647-658.
@article{c4836a2e96d94e9fa6a151c0e98ae8c3,
title = "The sedimentary response to a rapid change in lake level in Lake Tanganyika",
abstract = "We present records of sedimentary organic carbon, nitrogen, and carbonate, and stable isotope records of organic material and carbonate from a series of sediment cores that straddle the permanent chemocline in Lake Tanganyika. Sedimentation rates for these cores are consistent among the sites (~0.05-0.1cm y-1), and all records show an increase in sedimentary carbonate (aragonite) content centered at ~1879. The mid-19th century coincides with a major (~10m) lake level transgression. Throughout the period of lake level transgression and subsequent regression, the organic matter δ13C and δ15N records develop a prominent and coincident negative excursion followed by a return to values similar to those prior to the lake level transgression. This negative excursion in δ15N and δ13C is also coincident with an increase in carbonate-corrected organic carbon. We interpret the δ13C results as a decline in primary production during the transgression with the δ15N results signaling a concomitant increase in the reliance on nitrogen fixation as the nitrogen source. The coincident peak in organic carbon is interpreted as being a result of enhanced preservation driven by the precipitation and burial of aragonite.",
keywords = "Geochemistry, Lake Tanganyika, Little Ice Age, Transgression, δC, δN",
author = "James McManus and Silke Severmann and Andrew Cohen and McKay, {Jennifer L.} and Montanye, {Bo R.} and Hartwell, {Anne M.} and Brucker, {Rebecca L P} and Robert Wheatcroft",
year = "2015",
month = "12",
day = "15",
doi = "10.1016/j.palaeo.2015.09.035",
language = "English (US)",
volume = "440",
pages = "647--658",
journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",
issn = "0031-0182",
publisher = "Elsevier",

}

TY - JOUR

T1 - The sedimentary response to a rapid change in lake level in Lake Tanganyika

AU - McManus, James

AU - Severmann, Silke

AU - Cohen, Andrew

AU - McKay, Jennifer L.

AU - Montanye, Bo R.

AU - Hartwell, Anne M.

AU - Brucker, Rebecca L P

AU - Wheatcroft, Robert

PY - 2015/12/15

Y1 - 2015/12/15

N2 - We present records of sedimentary organic carbon, nitrogen, and carbonate, and stable isotope records of organic material and carbonate from a series of sediment cores that straddle the permanent chemocline in Lake Tanganyika. Sedimentation rates for these cores are consistent among the sites (~0.05-0.1cm y-1), and all records show an increase in sedimentary carbonate (aragonite) content centered at ~1879. The mid-19th century coincides with a major (~10m) lake level transgression. Throughout the period of lake level transgression and subsequent regression, the organic matter δ13C and δ15N records develop a prominent and coincident negative excursion followed by a return to values similar to those prior to the lake level transgression. This negative excursion in δ15N and δ13C is also coincident with an increase in carbonate-corrected organic carbon. We interpret the δ13C results as a decline in primary production during the transgression with the δ15N results signaling a concomitant increase in the reliance on nitrogen fixation as the nitrogen source. The coincident peak in organic carbon is interpreted as being a result of enhanced preservation driven by the precipitation and burial of aragonite.

AB - We present records of sedimentary organic carbon, nitrogen, and carbonate, and stable isotope records of organic material and carbonate from a series of sediment cores that straddle the permanent chemocline in Lake Tanganyika. Sedimentation rates for these cores are consistent among the sites (~0.05-0.1cm y-1), and all records show an increase in sedimentary carbonate (aragonite) content centered at ~1879. The mid-19th century coincides with a major (~10m) lake level transgression. Throughout the period of lake level transgression and subsequent regression, the organic matter δ13C and δ15N records develop a prominent and coincident negative excursion followed by a return to values similar to those prior to the lake level transgression. This negative excursion in δ15N and δ13C is also coincident with an increase in carbonate-corrected organic carbon. We interpret the δ13C results as a decline in primary production during the transgression with the δ15N results signaling a concomitant increase in the reliance on nitrogen fixation as the nitrogen source. The coincident peak in organic carbon is interpreted as being a result of enhanced preservation driven by the precipitation and burial of aragonite.

KW - Geochemistry

KW - Lake Tanganyika

KW - Little Ice Age

KW - Transgression

KW - δC

KW - δN

UR - http://www.scopus.com/inward/record.url?scp=84944462962&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84944462962&partnerID=8YFLogxK

U2 - 10.1016/j.palaeo.2015.09.035

DO - 10.1016/j.palaeo.2015.09.035

M3 - Article

AN - SCOPUS:84944462962

VL - 440

SP - 647

EP - 658

JO - Palaeogeography, Palaeoclimatology, Palaeoecology

JF - Palaeogeography, Palaeoclimatology, Palaeoecology

SN - 0031-0182

ER -