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Molluscs as evidence for a late Pleistocene and early Holocene humid period in the southern coastal desert of Peru (14.5 degrees S)

Maechtle, Bertil; Unkel, Ingmar LU ; Eitel, Bernhard; Kromer, Bernd and Schiegl, Solveig (2010) In Quaternary Research 73(1). p.39-47
Abstract
The southern Peruvian coastal desert around Palpa, southern Peru (14.5 degrees S) is currently characterized by hyper-arid conditions. However, the presence of two species of molluscs (Scutalus, Pupoides) and desert-loess deposits indicates the past development of semi-desert and grassland ecosystems caused by a displacement of the eastern desert margin due to hydrological changes. Radiocarbon dating shows that the transition to a semi-arid climate in the southern Peruvian coastal desert took place during the Greenland interstadial 1, similar to 13.5 cal ka BR At the beginning of the Holocene, the mollusc fauna vanished due to increasing humidity and the development of grasslands. Dust particles were fixed by the grasses, as indicated by... (More)
The southern Peruvian coastal desert around Palpa, southern Peru (14.5 degrees S) is currently characterized by hyper-arid conditions. However, the presence of two species of molluscs (Scutalus, Pupoides) and desert-loess deposits indicates the past development of semi-desert and grassland ecosystems caused by a displacement of the eastern desert margin due to hydrological changes. Radiocarbon dating shows that the transition to a semi-arid climate in the southern Peruvian coastal desert took place during the Greenland interstadial 1, similar to 13.5 cal ka BR At the beginning of the Holocene, the mollusc fauna vanished due to increasing humidity and the development of grasslands. Dust particles were fixed by the grasses, as indicated by abundant Poaceae phytoliths, and desert loess was formed. The humid period we observe here is out of phase with the palaeoenvironmental records from the Titicaca region, which indicates dry conditions at that time. This paper offers a new idea for this contradiction: an orbitally driven meridional shift of the Bolivian high might have altered the moisture supply across the Andes. (C) 2009 University of Washington. Published by Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Scutalus, Desert loess, Mollusc fauna, Palaeoenvironment, Palaeoclimatic change, Peruvian coastal desert, Pupoides
in
Quaternary Research
volume
73
issue
1
pages
39 - 47
publisher
Academic Press
external identifiers
  • wos:000273831600005
  • scopus:71049135746
ISSN
0033-5894
DOI
10.1016/j.yqres.2009.05.007
language
English
LU publication?
yes
id
bc0acdb3-4088-47bf-8bcc-c74ed21c9bb8 (old id 1547171)
date added to LUP
2010-02-24 11:05:40
date last changed
2018-05-29 10:47:56
@article{bc0acdb3-4088-47bf-8bcc-c74ed21c9bb8,
  abstract     = {The southern Peruvian coastal desert around Palpa, southern Peru (14.5 degrees S) is currently characterized by hyper-arid conditions. However, the presence of two species of molluscs (Scutalus, Pupoides) and desert-loess deposits indicates the past development of semi-desert and grassland ecosystems caused by a displacement of the eastern desert margin due to hydrological changes. Radiocarbon dating shows that the transition to a semi-arid climate in the southern Peruvian coastal desert took place during the Greenland interstadial 1, similar to 13.5 cal ka BR At the beginning of the Holocene, the mollusc fauna vanished due to increasing humidity and the development of grasslands. Dust particles were fixed by the grasses, as indicated by abundant Poaceae phytoliths, and desert loess was formed. The humid period we observe here is out of phase with the palaeoenvironmental records from the Titicaca region, which indicates dry conditions at that time. This paper offers a new idea for this contradiction: an orbitally driven meridional shift of the Bolivian high might have altered the moisture supply across the Andes. (C) 2009 University of Washington. Published by Elsevier Inc. All rights reserved.},
  author       = {Maechtle, Bertil and Unkel, Ingmar and Eitel, Bernhard and Kromer, Bernd and Schiegl, Solveig},
  issn         = {0033-5894},
  keyword      = {Scutalus,Desert loess,Mollusc fauna,Palaeoenvironment,Palaeoclimatic change,Peruvian coastal desert,Pupoides},
  language     = {eng},
  number       = {1},
  pages        = {39--47},
  publisher    = {Academic Press},
  series       = {Quaternary Research},
  title        = {Molluscs as evidence for a late Pleistocene and early Holocene humid period in the southern coastal desert of Peru (14.5 degrees S)},
  url          = {http://dx.doi.org/10.1016/j.yqres.2009.05.007},
  volume       = {73},
  year         = {2010},
}