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Journal of the Geological Society; 2005; v. 162; issue.3; p. 421-424;
DOI: 10.1144/0016-764904-071
© 2005 Geological Society of London

Short Communication

150 million years of climatic stability: evidence from the Atacama Desert, northern Chile

ADRIAN J. HARTLEY1, GUILLERMO CHONG2, JOHN HOUSTON3 & ANNE E. MATHER4

1 1Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen AB24 3UE, UK (e-mail: a.hartley@abdn.ac.uk)
2 2Departamento de Ciencias Geológicas, Universidad Católica del Norte, Angamos 0610, Antofagasta, Chile
3 3Nazca S.A., Avenida Las Condes 10.373, Officina 60, Santiago, Chile
4 4Department of Geographical Sciences, University of Plymouth, Plymouth PL4 8AA, UK

The sedimentary succession in the Atacama Desert records deposition under an arid to semiarid climate from the late Jurassic (150 Ma) to the present day. Palaeomagnetic data indicate no significant latitudinal movement of this area since the late Jurassic. The present-day location of the Atacama within the dry subtropical climate belt is the principal cause of aridity. This situation is likely to have prevailed since the late Jurassic, supplemented by (1) the continentality effect (enhanced by the Gondwanan landmass), and (2) the presence offshore of a cold, upwelling current (from at least the early Cenozoic onwards and possibly earlier), resulting in conditions promoting climatic stability and desert development. Rapid and extreme climatic fluctuations during the Plio-Pleistocene were not sufficient to destabilize the climate within the Atacama. Comparison with other long-lived deserts (e.g. SW USA, Namib, Sahara and Australia) suggests that the Atacama is the oldest extant desert on Earth.

Key Words: Atacama • Chile • Andes • palaeoclimatology • deserts




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