U-Pb geochronology data for Mindola Deposit, Zambia Copperbelt

U-Pb (Uranium – Lead) geochronology data of rutile from the Mindola Deposit Zambia Copperbelt. Full U/Pb isotope data, uncertainties and calculated ages for individual spot analyses for each sample and standard. Samples from Mindola North, Zambia, taken from the University of Southampton Archive. The samples were from the Kitwe Formation and included Dolomitic Siltstone, Quartz-Carbonate veins, Impure Dolostone and Anhydrite Conglomerate. The Kitwe Formation is the major host to Cu-Co mineralisation at Nkana-Mindola, particularly within the Ore Shale member. At Mindola and Mindola North, the Ore Shale is continuous along strike until a barren gap of siliceous dolostones called the Kitwe Barren gap. Overlying the Ore Shale are a series of quartzite, dolomitic argillites and dolostones of the Rokana Evaporites The remainder of the Kitwe Formation is overlain by the Upper Roan Group carbonates. For geological setting of samples, see Chapter 4 in Kelly, Jamie (2024) Dataset for thesis "Constraining Cu-(Co) mineralisation in sediment-hosted copper deposits using rutile, apatite, and carbonate geochronology". University of Southampton doi:10.5258/SOTON/D3219 [Dataset]

Date (Creation): 2025-09-15

Identifier: http://data.bgs.ac.uk/id/dataHolding/13608532

Originator

University of Southampton - Professor Stephen Roberts ( Ocean and Earth Science )

National Oceanography Centre, Waterfront Campus, European Way , Southampton , SO14 3ZH ,

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British Geological Survey - Enquiries

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GEMET - INSPIRE themes, version 1.0

Geology

BGS Thesaurus of Geosciences

Lead
Rutile
NGDC Deposited Data
Copper deposits
Uranium
Geochronology

dataCentre

NGDC Deposited Data

Keywords

NERC_DDC

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Other constraints: Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Metadata language: EnglishEnglish

Topic category

Geoscientific information

Begin date: 2020-09-01

End date: 2023-09-01

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Excel Spreadsheet (.xlsx) ()

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British Geological Survey - Enquiries

OnLine resource: Data

Hierarchy level: nonGeographicDataset Non geographic dataset

Other: non geographic dataset

Conformance result

Date (Publication): 2011

Explanation: See the referenced specification

Pass: No

Conformance result

Date (Publication): 2010-12-08

Explanation: See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Pass: No

Statement: Laser Ablation system at NERC laboratories Keyworth. Standard procedures followed and held in the data file. In situ, laser ablation multi-collector ICP-MS (LA-MC-ICP-MS) U-Pb age determinations for rutile and apatite were completed at the British Geological Survey (BGS) Isotope Research Facility, Nottingham, using a New Wave Research 193 nm laser coupled to a Nu instruments Nu plasma HR multi-collector mass spectrometer. The machine enables simultaneous detection of all masses in the range of 202207, 235 and 238. Rutile U and Pb isotope acquisition follows the procedure outlined in Bracciali et al., (2013). Ablation parameters involved a fluence of 3 J/cm2 and repetition rate of 5 Hz. Rutile grain sizes exceeding 50 µm were preferentially targeted but was not always possible due to grain sizes falling between 20-50 µm. Therefore, a 20 µm spot size was chosen to encompass the full suite of rutile grains in each sample. Sugluk-4 (Braccialli et al., 2013) was run as the primary standard to calibrate U-Pb ages and correct isotope ratios for laser-induced and instrumental mass fractionation using standard-sample bracketing. Standards PCA-S207, R10b (Luvizotto et al., 2009a) and R19 (Schmitt and Zack, 2012) were used as secondary reference materials to monitor accuracy and precision. The isotopic homogeneity of Sugluk-4 and PCA-S207 precludes the requirement of a common Pb (Pbc) correction to the data (Bracciali et al., 2013). Identical measurement parameters were used for the reference materials and unknowns. Apatite analyses used an identical setup but used the MAD apatite from Madagascar (Thomson et al., 2012) and the Durango apatite from Mexico (Chew et al., 2016) as primary and secondary reference materials respectively. Due to the common Pb within these standards, a 207Pb correction was performed on the primary standard following the method of Chew et al., (2014). Data reduction and downhole fractionation correction for rutile was performed using Iolite (Paton et al., 2010; 2011) and the VizualAge plugin (Petrus and Kamber, 2012) was utilised for apatite. The mean square of weighted deviations (MSWD) and p-value is used to assess the degree of over or inunder dispersion and precision of each isochron (Wendt and Carl, 1991). All isochron diagrams were produced using the model-1 approach in IsoplotR (Vermeesch, 2018). Model-1 isochrons attempts to deal with overdispersion by inflating all analytical uncertainties by the √MSWD which reduces the MSWD to a minimum (Vermeesch, 2018). Uncertainty propagation protocols follow that of Horstwood et al., (2016). All error ellipses are drawn to 95% confidence and the lower intercept age uncertainties reported using 2σ of the mean followed by the final uncertainty that includes a 2% systematic uncertainty propagation to account for the secondary standard reproducibility. Unless otherwise stated, all T-W concordia plots are presented as anchored regressions, with the initial Pbc composition estimated using the Stacey and Kramers (1975) Pb evolution model. Full U/Pb isotope data, uncertainties and calculated ages for individual spot analyses for each sample and standard are reported in Appendix C.2. Accuracy and precision for secondary reference materials is noted in Chapter 3, section 3.5.1 of thesis doi:10.5258/SOTON/D3219