c68b8657-2491-5206-e054-002128a47908 English dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-05-03 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13607784 WGS 84 / UTM zone 19S (EPSG::32719) Hematite and goethite oxygen isotope data from the Spence and Cerro Colorado porphyry copper deposits, Central Andes 2021-06-28 creation http://data.bgs.ac.uk/id/dataHolding/13607784 This spreadsheet contains 21 oxygen isotope measurements for hematite and mixed hematite/goethite samples from the supergene profiles of the Spence and Cerro Colorado porphyry copper deposits in the Central Andes. Columns are also included which contain calculated isotopic values for weathering fluids which were present at the time of iron oxide formation. These data are presented and discussed in the G-cubed paper 'A rusty record of weathering and groundwater movement in the hyperarid Central Andes' (Shaw et al., 2021). Weathering fluid isotopic values are calculated using the published fractionation factors of Clayton & Epstein (1961), Yapp (1990) and Bao & Koch (1999). The authors have the most confidence in the fluid values obtained using the fractionation factor of Yapp (1990), for reasons outlined in the publication. Joseph Shaw University of Bristol PhD student, School of Earth Sciences Wills Memorial Building, Queens Road Bristol BS8 1RJ not available originator Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available pointOfContact notApplicable https://resources.bgs.ac.uk/images/geonetworkThumbs/c68b8657-2491-5206-e054-002128a47908.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Porphyry copper deposits Iron oxides Oxygen isotopes Goethite Hematite Weathering BGS Thesaurus of Geosciences 2022 revision NGDC Deposited Data dataCentre NERC_DDC otherRestrictions licenceOGL Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" otherRestrictions The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused. Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" textTable English geoscientificInformation -69.2700 -69.2400 -22.8000 -20.0400 2018-05-02 2020-01-29 Microsoft Excel witheld Enquiries British Geological Survey United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item167049 WWW:DOWNLOAD-1.0-http--download Data download dataset dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false Oxygen isotope analysis of 21 hematite(goethite) samples (Spence, 15; Cerro Colorado, 6) was conducted at the SUERC Stable Isotope Facility (East Kilbride) via laser fluorination (e.g. Guiliani et al., 2005). For each measurement, 3–5 mg of hematite(goethite) was heated with a CO2 laser in the presence of a fluorine-based reagent (ClF3). After passing through an in-line Hg-diffusion pump, liberated oxygen was converted to CO2 using a heated rod of platinised graphite. Isotopic measurements were made using a BG Optima dual-inlet mass spectrometer. Isotopic values were calculated using the mass measurements of CO2 isotopologues and are reported as δ18O ‰ vsmow. Calibration on three secondary standards (UWG2, GP147 (international garnet standards), YP2 (internal quartz standard)) gave a standard error of 0.07 and R2=0.9999. Internal uncertainty on the isotopic measurements is <0.1 ‰ (1σ).