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Stratigraphy and paleoenvironments of the early to middle Holocene Chipalamawamba Beds (Malawi Basin, Africa)

Bert Van Bocxlaer UGent, Wout Salenbien UGent, Nore Praet UGent and Jacques Verniers UGent (2012) BIOGEOSCIENCES. 9(1). p.4497-4512
abstract
We describe the Chipalamawamba Beds, early to middle Holocene deposits at the southern margin of longlived Lake Malawi. The beds are exposed because of downcutting of the upper Shire River. The Chipalamawamba sediments are medium to coarse, yellow to brown sands deposited in lenses varying in horizontal extent from a few meters to several hundreds of meters. Four units are recognized; the first three mainly contain lacustrine sediments deposited during lake high stands about 10.6–9.7 cal ka BP (Unit 1), 7.6–6.5 cal ka BP (Unit 2) and 5.9–5.3 cal ka BP. Sediments of Unit 4 overlay Units 1 to 3, are coarser and display regular foresets and oblique-bedding, suggesting deposition in riverine environments after installation of the Shire River (ca. 5.0 ka BP). Freshwater mollusk assemblages and bioturbation regularly occur in the lacustrine sediments, but are largely absent from Unit 4. Diverse and often contradicting hypotheses on the lake levels of Lake Malawi have been proposed for the early and middle Holocene. The Chipalamawamba Beds allow straightforward recognition of water levels and provide strong evidence for oscillating lake levels during this period, rather than continuous high or low levels. Sedimentation rates have been high and individual shell beds have typically been deposited during a few decades. Because the Chipalamawamba Beds contain a sequence of mollusk assemblages with intervals between subsequent shell beds ranging from a century to a few millennia, they enable paleontological analysis of the fauna with an unusually high temporal resolution. That some mollusk lineages inhabiting Lake Malawi are in the early stages of diversification and radiation increases the paleobiological relevance of these beds.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Holocene, Stratigraphy, Chipalamawamba Beds, Malawi, gastropods, bivalves, fluvial deposits, paleoenvironment, C14 ages, lacustrine deposits.
journal title
BIOGEOSCIENCES
Biogeosciences
volume
9
issue
1
pages
4497 - 4512
Web of Science type
Article
Web of Science id
000312667300023
JCR category
GEOSCIENCES, MULTIDISCIPLINARY
JCR impact factor
3.754 (2012)
JCR rank
13/170 (2012)
JCR quartile
1 (2012)
ISSN
1726-4170
DOI
10.5194/bg-9-4497-2012
language
English
UGent publication?
yes
classification
A1
copyright statement
I have retained and own the full copyright for this publication
id
3052223
handle
http://hdl.handle.net/1854/LU-3052223
date created
2012-11-13 13:58:51
date last changed
2013-06-05 13:41:02
@article{3052223,
  abstract     = {We describe the Chipalamawamba Beds, early to middle Holocene deposits at the southern margin of longlived Lake Malawi. The beds are exposed because of downcutting of the upper Shire River. The Chipalamawamba sediments are medium to coarse, yellow to brown sands deposited in lenses varying in horizontal extent from a few meters to several hundreds of meters. Four units are recognized; the first three mainly contain lacustrine sediments deposited during lake high stands about 10.6--9.7 cal ka BP (Unit 1), 7.6--6.5 cal ka BP (Unit 2) and 5.9--5.3 cal ka BP. Sediments of Unit 4 overlay Units 1 to 3, are coarser and display regular foresets and oblique-bedding, suggesting deposition in riverine environments after installation of the Shire River (ca. 5.0 ka BP). Freshwater mollusk assemblages and bioturbation regularly occur in the lacustrine sediments, but are largely absent from Unit 4. Diverse and often contradicting hypotheses on the lake levels of Lake Malawi have been proposed for the early and middle Holocene. The Chipalamawamba Beds allow straightforward recognition of water levels and provide strong evidence for oscillating lake levels during this period, rather than continuous high or low levels. Sedimentation rates have been high and individual shell beds have typically been deposited during a few decades. Because the Chipalamawamba Beds contain a sequence of mollusk assemblages with intervals between subsequent shell beds ranging from a century to a few millennia, they enable paleontological analysis of the fauna with an unusually high temporal resolution. That some mollusk lineages inhabiting Lake Malawi are in the early stages of diversification and radiation increases the paleobiological relevance of these beds.},
  author       = {Van Bocxlaer, Bert and Salenbien, Wout and Praet, Nore and Verniers, Jacques},
  issn         = {1726-4170},
  journal      = {BIOGEOSCIENCES},
  keyword      = {Holocene,Stratigraphy,Chipalamawamba Beds,Malawi,gastropods,bivalves,fluvial deposits,paleoenvironment,C14 ages,lacustrine deposits.},
  language     = {eng},
  number       = {1},
  pages        = {4497--4512},
  title        = {Stratigraphy and paleoenvironments of the early to middle Holocene Chipalamawamba Beds (Malawi Basin, Africa)},
  url          = {http://dx.doi.org/10.5194/bg-9-4497-2012},
  volume       = {9},
  year         = {2012},
}

Chicago
Van Bocxlaer, Bert, Wout Salenbien, Nore Praet, and Jacques Verniers. 2012. “Stratigraphy and Paleoenvironments of the Early to Middle Holocene Chipalamawamba Beds (Malawi Basin, Africa).” Biogeosciences 9 (1): 4497–4512.
APA
Van Bocxlaer, B., Salenbien, W., Praet, N., & Verniers, J. (2012). Stratigraphy and paleoenvironments of the early to middle Holocene Chipalamawamba Beds (Malawi Basin, Africa). BIOGEOSCIENCES, 9(1), 4497–4512.
Vancouver
1.
Van Bocxlaer B, Salenbien W, Praet N, Verniers J. Stratigraphy and paleoenvironments of the early to middle Holocene Chipalamawamba Beds (Malawi Basin, Africa). BIOGEOSCIENCES. 2012;9(1):4497–512.
MLA
Van Bocxlaer, Bert, Wout Salenbien, Nore Praet, et al. “Stratigraphy and Paleoenvironments of the Early to Middle Holocene Chipalamawamba Beds (Malawi Basin, Africa).” BIOGEOSCIENCES 9.1 (2012): 4497–4512. Print.