Climatic cycles inferred from the aminostratigraphy and aminochronology of Quaternary dunes and palaeosols from the eastern islands of the Canary Archipelago

Torres Pérez-Hidalgo, Trinidad José (2006). Climatic cycles inferred from the aminostratigraphy and aminochronology of Quaternary dunes and palaeosols from the eastern islands of the Canary Archipelago. "JQS.Journal of Quaternary Science", v. 21 (n. 3); pp. 287-306. ISSN 0267-8179.

Description

Title: Climatic cycles inferred from the aminostratigraphy and aminochronology of Quaternary dunes and palaeosols from the eastern islands of the Canary Archipelago
Author/s:
  • Torres Pérez-Hidalgo, Trinidad José
Item Type: Article
Título de Revista/Publicación: JQS.Journal of Quaternary Science
Date: 2006
Volume: 21
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Ingeniería Geológica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Aminochronological and aminostratigraphical methods have been used to study the Quaternary a e o l i a n deposits f r om the islands located east of the Canary Archipelago (Fuerteventura and Lanzarote islands and La Graciosa , Montana Clara and Alegranza islets). T h e extent of racemisation/ epimerisation of four amino acids ( isoleucine , aspartic acid , phenylalanine and glutamic acid) was measured in land snail shells of the genus Theba. The age calculation algorithms of these amino acids h a v e b e e n determined to permit t he numerical dating of these deposits. Eight A m i n o z o n e s , e a ch defining dune/palaeosol-formation episodes, have been distinguished and dated at 4 8 . 6 ± 6 . 4, 42.5 ± 6 . 0 , 37.8 ± 4 . 6 , 29.4 ± 4 . 8 , 22.4 ± 4 . 5 , 14.9 ± 3.6, 11.0 ± 4 . 0 and 5.4 ± 1.1 ka B P , t h e first f i ve of t h em defining c y c l e s of 5 - 7 ka. The alternation of palaeosols and a e o l i a n deposits, w h i c h are related to abrupt transitions from humid to arid conditions, are t he reflection of globally induced changes in North Africa palaeoenvironmental conditions linked to the effect of African palaeomonsoons on the trade w i n d s and the Saharan Air Layer. Probably these a eolian cycles , with a recurrence neriod of 5 - 7 ka. are t he expression of multiples of the ~ 2 . 4 ka solar-cycle

More information

Item ID: 3264
DC Identifier: http://oa.upm.es/3264/
OAI Identifier: oai:oa.upm.es:3264
Deposited by: Biblioteca ETSI Minas y Energía
Deposited on: 07 Jun 2010 09:48
Last Modified: 20 Apr 2016 12:47
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