Molluscs as Evidence for a Late Pleistocene and Early Holocene Humid Period in the Southern Coastal Desert of Peru (14.5°S)
The southern Peruvian coastal desert around Palpa, southern Peru (14.5°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 cau...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1016/j.yqres.2009.05.007 2024-09-09T19:43:21+00:00 Molluscs as Evidence for a Late Pleistocene and Early Holocene Humid Period in the Southern Coastal Desert of Peru (14.5°S) Mächtle, Bertil Unkel, Ingmar Eitel, Bernhard Kromer, Bernd Schiegl, Solveig 2010 http://dx.doi.org/10.1016/j.yqres.2009.05.007 http://api.elsevier.com/content/article/PII:S0033589409000672?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589409000672?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400003707 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 73, issue 1, page 39-47 ISSN 0033-5894 1096-0287 journal-article 2010 crcambridgeupr https://doi.org/10.1016/j.yqres.2009.05.007 2024-06-19T04:02:15Z The southern Peruvian coastal desert around Palpa, southern Peru (14.5°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, ∼ 13.5 cal ka BP. 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. Article in Journal/Newspaper Greenland Cambridge University Press Greenland Quaternary Research 73 1 39 47 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
The southern Peruvian coastal desert around Palpa, southern Peru (14.5°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, ∼ 13.5 cal ka BP. 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. |
format |
Article in Journal/Newspaper |
author |
Mächtle, Bertil Unkel, Ingmar Eitel, Bernhard Kromer, Bernd Schiegl, Solveig |
spellingShingle |
Mächtle, Bertil Unkel, Ingmar Eitel, Bernhard Kromer, Bernd Schiegl, Solveig Molluscs as Evidence for a Late Pleistocene and Early Holocene Humid Period in the Southern Coastal Desert of Peru (14.5°S) |
author_facet |
Mächtle, Bertil Unkel, Ingmar Eitel, Bernhard Kromer, Bernd Schiegl, Solveig |
author_sort |
Mächtle, Bertil |
title |
Molluscs as Evidence for a Late Pleistocene and Early Holocene Humid Period in the Southern Coastal Desert of Peru (14.5°S) |
title_short |
Molluscs as Evidence for a Late Pleistocene and Early Holocene Humid Period in the Southern Coastal Desert of Peru (14.5°S) |
title_full |
Molluscs as Evidence for a Late Pleistocene and Early Holocene Humid Period in the Southern Coastal Desert of Peru (14.5°S) |
title_fullStr |
Molluscs as Evidence for a Late Pleistocene and Early Holocene Humid Period in the Southern Coastal Desert of Peru (14.5°S) |
title_full_unstemmed |
Molluscs as Evidence for a Late Pleistocene and Early Holocene Humid Period in the Southern Coastal Desert of Peru (14.5°S) |
title_sort |
molluscs as evidence for a late pleistocene and early holocene humid period in the southern coastal desert of peru (14.5°s) |
publisher |
Cambridge University Press (CUP) |
publishDate |
2010 |
url |
http://dx.doi.org/10.1016/j.yqres.2009.05.007 http://api.elsevier.com/content/article/PII:S0033589409000672?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589409000672?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400003707 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Quaternary Research volume 73, issue 1, page 39-47 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2009.05.007 |
container_title |
Quaternary Research |
container_volume |
73 |
container_issue |
1 |
container_start_page |
39 |
op_container_end_page |
47 |
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1809912704714932224 |