Triple oxygen isotope systematics of structurally bonded water in gypsum

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Title:Main Title: Triple oxygen isotope systematics of structurally bonded water in gypsum
Description:Abstract: The triple oxygen isotopic composition of gypsum mother water (gmw) is recorded in structurally bonded water in gypsum (gsbw). Respective fractionation factors have been determined experimentally for 18O/16O and 17O/16O. By taking previous experiments into account we suggest using 18agsbw-gmw = 1.0037; 17agsbw-gmw = 1.00195 and hgsbw-gmw = 0.5285 as fractionation factors in triple oxygen isotope space. Recent gypsum was sampled from a series of 10 ponds located in the Salar de Llamara in the Atacama Desert, Chile. Total dissolved solids (TDS) in these ponds show a gradual increase from 23 g/l to 182 g/l that is accompanied by an increase in pond water 18O/16O. Gsbw falls on a parallel curve to the ambient water from the saline ponds. The offset is mainly due to the equilibrium fractionation between gsbw and gmw. However, gsbw represents a time integrated signal biased towards times of strong evaporation, hence the estimated gmw comprises elevated 18O/16O compositions when compared to pond water samples taken on site. Gypsum precipitation is associated with algae mats in the ponds with lower salinity. No evidence for respective vital effects on the triple oxygen isotopic composition of gypsum hydration water is observed, nor are such effects expected. In principle, the array of d18Ogsbw vs. 17Oexcess can be used to: (1) provide information on the degree of evaporation during gypsum formation; (2) estimate pristine meteoric water compositions; and (3) estimate local relative humidity which is the controlling parameter of the slope of the array for simple hydrological situations. In our case study, local mining activities may have decreased deep groundwater recharge, causing a recent change of the local hydrology.
Identifier:10.1016/j.gca.2017.04.026 (DOI)
Responsible Party
Creators:Daniel Herwartz (Author), Jakub Surma (Author), Claudia Voigt (Author), Sergey Assonov (Author), Michael Staubwasser (Author)
Publisher:Elsevier Science, Amsterdam, The Netherlands
Publication Year:2018
CRC1211 Topic:Climate
Related Subproject:D3
Subjects:Keywords: Stable Isotope Geochemistry, Paleoclimate Proxies
Geogr. Information Topic:Inland Waters
File Details
Data Type:Text - Article
File Size:930 KB
Date:Issued: 15.07.2017
Mime Type:application/pdf
Data Format:PDF
Download Permission:Only Project Members
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:[CRC1211DB] Data policy agreement
Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Geochimica et Cosmochimica Acta
Number of Pages:13 (254 - 266)
Metadata Details
Metadata Creator:Claudia Voigt
Metadata Created:23.02.2018
Metadata Last Updated:23.02.2018
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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