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  • 1
    Keywords: Ore deposits ; Metallogenese
    Description / Table of Contents: Presents 13 papers on topical subjects in ore deposit research viewed in the context of Earth evolution
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (333 Seiten)
    ISBN: 9781862396265
    Series Statement: Geological Society special publication 393
    DDC: 553.1
    RVK:
    Language: English
    Note: Editors: G.R.T. Jenkin (University of Leicester, UK), P.A.J. Lusty (British Geological Survey, UK), I. McDonald (Cardiff University, UK), M.P. Smith (University of Brighton, UK), A.J. Boyce (Scottish Universities Environmental Research Centre, UK), J.J. Wilkinson (Natural History Museum and Imperial College London, UK) , Ore deposits in an evolving Earth : an introduction / G.R.T. Jenkin, P.A.J. Lusty, I. McDonald, M.P. Smith, A.J. Boyce, & J.J. WilkinsonTemporal relations between mineral deposits and global tectonic cycles / P.A. Cawood & C.J. Hawkesworth -- Crustal evolution, intra-cratonic architecture and the metallogeny of an Archaean craton / D.R. Mole, M.L. Fiorentini, K.F. Cassidy, C.L. Kirkland, N. Thebaud, T.C. McCuaig, M.P. Doublier, P. Duuring, S.S. Romano, R. Maas, E.A. Belousova, S.J. Barnes, & J. Miller -- A mineral system approach to iron ore in Archaean and Palaeoproterozoic BIF of western Australia / T. Angerer, P. Duuring, S.G. Hagemann, W. Thorne, & T.C. McCuaig -- The role of metamorphic fluids in the formation of ore deposits / B.W.D. Yardley & J.S. Cleverley -- The Massawa gold deposit, eastern Senegal, West Africa : an orogenic gold deposit sourced from magmatically derived fluids? / P.J. Treloar, D.M. Lawrence, D. Senghor, A. Boyce, & P. Harbridge -- Setting the stage for the genesis of the giant Bendigo ore system / S.W. Bull & R.R. Large -- Abundant sulphate in the Neoproterozoic ocean : implications of constant [delta]³⁴S of barite in the Aberfeldy SEDEX deposits, Scottish Dalradian / N.R. Moles, A.J. Boyce, & A.E. Fallick -- How the Neoproterozoic S-isotope record illuminates the genesis of vein gold systems : an example from the Dalradian Supergroup in Scotland / N.J. Hill, G.R.T. Jenkin, A.J. Boyce, C.J.S. Sangster, D.J. Catterall, D.A. Holwell, J. Naden, & C.M. Rice -- The immobilization of gold from gold (III) chloride by a halophilic sulphate-reducing bacterial consortium / J. Shuster, S. Marsden, L.C.W. MacLean, J. Ball, T. Bolin, & G. Southam -- Challenges to global mineral resource security and options for future supply / P.A.J. Lusty & A.G. Gunn -- Tectonic-diffusion estimates of global mineral resources : extending the methods : granitic tin deposits / S.E. Kesler & B.H. Wilkinson -- The criticality of metals : a perspective for geologists / T.E. Graedel & N.T. Nassar -- Future Rx : optimism, preparation, acceptance of risk / L.M. Cathles.
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  • 2
    Publication Date: 2021-04-23
    Description: Marine carbonate chemistry measurements have been carried out annually since 2009 during UK research cruises along the Extended Ellett Line (EEL), a hydrographic transect in the northeast Atlantic Ocean. The EEL intersects several water masses that are key to the global thermohaline circulation, and therefore the cruises sample a region in which it is critical to monitor secular physical and biogeochemical changes. We have combined results from these EEL cruises with existing quality-controlled observational data syntheses to produce a hydrographic time series for the EEL from 1981 to 2013. This reveals multidecadal increases in dissolved inorganic carbon (DIC) throughout the water column, with a near-surface maximum rate of 1.800.45 mu molkg(-1)yr(-1). Anthropogenic CO2 accumulation was assessed, using simultaneous changes in apparent oxygen utilization (AOU) and total alkalinity (TA) as proxies for the biogeochemical processes that influence DIC. The stable carbon isotope composition of DIC (C-13(DIC)) was also determined and used as an independent test of our method. We calculated a volume-integrated anthropogenic CO2 accumulation rate of 2.80.4mgCm(-3)yr(-1) along the EEL, which is about double the global mean. The anthropogenic CO2 component accounts for only 316% of the total DIC increase. The remainder is derived from increased organic matter remineralization, which we attribute to the lateral redistribution of water masses that accompanies subpolar gyre contraction. Output from a general circulation ecosystem model demonstrates that spatiotemporal heterogeneity in the observations has not significantly biased our multidecadal rate of change calculations and indicates that the EEL observations have been tracking distal changes in the surrounding North Atlantic and Nordic Seas.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2021-04-23
    Description: The stable carbon isotope composition of dissolved inorganic carbon (δ13CDIC) in seawater was measured in samples collected during June—July 2014 in the subpolar North Atlantic. Sample collection was carried out on the RRS James Clark Ross cruise JR302, part of the "Radiatively Active Gases from the North Atlantic Region and Climate Change" (RAGNARoCC) research programme. The observed δ13CDIC values for cruise JR302 fall in a range from 0.07 ‰ to +1.95 ‰, relative to the Vienna Peedee Belemnite standard. From duplicate samples collected during the cruise, the 1σ precision for the 341 results is 0.08 ‰, which is similar to our previous work and other studies of this kind. We also performed a cross-over analysis using nearby historical δ13CDIC data, which indicated that there were no significant systematic offsets between our measurements and previously published results. We also included seawater reference material (RM) produced by A. G. Dickson (Scripps Institution of Oceanography, USA) in every batch of analysis, enabling us to improve upon the calibration and quality-control procedures from a previous study. The δ13CDIC is consistent within each RM batch, although its value is not certified. We report δ13CDIC values of 1.15 ± 0.03 ‰ and 1.27 ± 0.05 ‰ for batches 141 and 144 respectively. Our JR302 δ13CDIC data can be used – along with measurements of other biogeochemical variables – to constrain the processes that control DIC in the interior ocean, in particular the oceanic uptake of anthropogenic carbon dioxide and the biological carbon pump. Our δ13CDIC results are available from the British Oceanographic Data Centre – doi:10.5285/22235f1a-b7f3-687f-e053-6c86abc0c8a6.
    Type: Article , PeerReviewed
    Format: text
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