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Biogeochemical cycling of sulphur in karst and transfer into speleothem archives at Grotta di Ernesto, Italy

Wynn, Peter and Borsato, Andrea and Baker, Andy and Frisia, Silvia and Miorandi, Renza and Fairchild, Ian J. (2013) Biogeochemical cycling of sulphur in karst and transfer into speleothem archives at Grotta di Ernesto, Italy. Biogeochemistry, 114 (1-3). pp. 255-267. ISSN 0168-2563

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Abstract

Trace amounts of sulphur in speleothems suggest that stalagmites may act as archives of sulphur deposition, thereby recording aspects of atmospheric variability in sulphur content. Accurate interpretation of this novel sulphur archive depends upon understanding how biogeochemical cycling in the soil and epikarst above the cave may modify the precursor atmospheric values of sulphur concentration and isotopic composition prior to incorporation into the speleothem record. Dual isotope analysis of δ34S-SO4 and δ18O-SO4 is used to trace biogeochemical transformations of atmospheric sulphur through the cave system at Grotta di Ernesto in the Italian Alps and builds towards a framework for interpretation of speleothem sulphur archives which depends on overlying ecosystem dynamics and karst hydrological properties. A three component model of atmospheric signal modification is proposed to be driven by 1. vegetation and soil cycling, 2. the degree of groundwater mixing in the karst aquifer; and 3. redox status. The relative influence of each process is specific to individual drip flow sites and associated stalagmites, rendering each suphur archive a unique signal of environmental conditions. Under conditions found in the soil and epikarst above Grotta di Ernesto, the dual isotope signatures of sulphate sulphur and oxygen incorporated into speleothem carbonate, closely reflect past conditions of industrial sulphur loading to the atmosphere and the extent of signal modification through biogeochemical cycling and aquifer mixing.

Item Type: Article
Journal or Publication Title: Biogeochemistry
Uncontrolled Keywords: Sulphur ; Isotopes ; Biogeochemistry ; Speleothem ; Karst
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 59362
Deposited By: ep_importer_pure
Deposited On: 22 Oct 2012 09:34
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:43
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/59362

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