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Coupled micromorphological and stable isotope analysis of Quaternary

Whitfield, E and Adamson, K and Candy, I (2015) Coupled micromorphological and stable isotope analysis of Quaternary. Quaternary Research, 84 (2). pp. 272-286. ISSN 1096-0287

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Abstract

Pedogenic calcretes are widespread in arid and semi-arid regions. Using calcrete profiles from four river terraces of the Rio Alias in southeast Spain, this study explores the potential of using detailed micromorphological and stable isotopic analysis to more fully understand the impacts of Quaternary environmental change on calcrete development. The four profiles increase in carbonate complexity with progressive age, reflecting calcretisation over multiple glacial-interglacial cycles since MIS 9 (c. 300 ka). Calcrete profiles contain a mixture of Alpha (non-biogenic) and Beta (biogenic) microfabrics. Alpha fabrics have higher δ13C and δ18O values. The profiles contain a range of crystal textures, but there is little difference between the δ13C and δ18O values of spar, microspar, and micrite cements. Strong positive covariance between δ13C and δ18O suggests that both isotopes are responding to the same environmental parameter, which is inferred to be relative aridity. The study reveals that the detailed co-analysis of calcrete micromorphology and stable isotope signatures can allow patterns of calcrete formation to be placed into a wider palaeoclimatic context. This demonstrates the potential of this technique to more reliably constrain the palaeoenvironmental significance of secondary carbonates in dryland settings where other proxy records may be poorly preserved.

Item Type: Article
Uncontrolled Keywords: 0403 Geology, 0406 Physical Geography And Environmental Geoscience, 2101 Archaeology
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Natural Sciences and Psychology
Publisher: Elsevier
Date Deposited: 02 Sep 2016 10:17
Last Modified: 02 Sep 2016 10:17
DOI or Identification number: 10.1016/j.yqres.2015.05.002
URI: http://researchonline.ljmu.ac.uk/id/eprint/4083

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