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  • 1
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    Presentation of the Mineralogical Society of America Award for 2015 to Nicholas J. Tosca (2016)
    Mineralogical Society of America
    Details
    Publication Date: 2016-04-02
    Print ISSN: 0003-004X
    Electronic ISSN: 1945-3027
    Topics: Geosciences
    Published by Mineralogical Society of America
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  • 2
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    Riparian eucalypt biogeochemical expression of groundwater salinity, Murray River, South Australia (2013)
    Geological Society of London
    Details
    Publication Date: 2013-06-25
    Description: Salinisation of floodplains along the Murray River is a significant environmental and social problem in south-eastern Australia that can be expensive and time-consuming to monitor. The potential of plant biogeochemistry as an environmental monitoring tool, specifically its innovative application to groundwater salinity detection, is explored in this paper. Major and trace element biogeochemical data were compared to data from three geophysical surveys in the study area as well as field observations of the underlying stratigraphy. The result is an understanding of how groundwater chemistry can be characterised by plants, specifically river red gum ( Eucalyptus camaldulensis ) and black box ( Eucalyptus largiflorens ) leaves. From the survey it is evident that E. camaldulensis and E. largiflorens were both successful in expressing high salinity levels in the subsurface. Molybdenum was the most suitable pathfinder element for high salinity groundwater. The study has important implications for interpreting biogeochemical mineral exploration results; anomalous element concentrations need to be interpreted in relation to salinity levels.
    Print ISSN: 1467-7873
    Electronic ISSN: 1467-7873
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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  • 3
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    Scale and timing of Rare Earth Element redistribution in the Taconian foreland of New England (2004)
    International Association of Sedimentologists
    In:  Sedimentology, 51 (4). pp. 885-897.
    Details
    Publication Date: 2018-07-17
    Description: Clastic sedimentary rocks, deposited on eastern North America in response to the Taconian Orogeny, commonly have Sm/Nd isotope relationships indicating substantial isotope disturbance near or subsequent to the time of sedimentation that may be associated with severe depletion in light rare earth elements (LREE). Affected units [Normanskill Formation (Austin Glen and Pawlet Members), Frankfort Formation and Perry Mountain Formation] are widely separated both geographically (western New York to western Maine) and stratigraphically (Middle Ordovician to Silurian). A model is proposed for the most likely explanation of the observed REE and Sm/Nd isotope relationships involving a two-stage process. In the first stage, REE are redistributed on a mineralogical scale (dissolution/precipitation on a sample scale) often with the involvement of REE-enriched trace phases such as apatite and monazite. This stage typically takes place during diagenesis but may also take place later during metamorphism and/or recent weathering, and results in isotope re-equilibration on a sample scale. The second stage occurs when one or more of these phases is redissolved and REE are transported on large advective scales. Where LREE-enriched phases are involved, this gives rise to LREE depletion in whole rocks. The timing of this second stage cannot be constrained from Sm/Nd isotope data and may take place at any time subsequent to the isotope re-equilibration. Such complex histories of REE redistribution may result in serious errors in estimating Nd model ages but not in estimating the Nd isotope composition at the age of sedimentation. Thus, Sm/Nd ratios even of unmetamorphosed sedimentary rocks have to be carefully evaluated before the calculation of depleted mantle model ages for the provenance.
    Type: Article , PeerReviewed
    Format: text
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  • 4
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    The Roles of Provenance Sedimentary Processes in the Geochemistry of Sedimentary Rocks (2003)
    Geological Association of Canada
    In:  In: Geochemistry of Sediments and Sedimentary Rocks: evolutionary considerations to mineral deposit-forming environments. , ed. by Lentz, D. R. Geological Association of Canada Short Course Notes, 16 . Geological Association of Canada, Toronto.
    Details
    Publication Date: 2017-04-11
    Type: Book chapter , NonPeerReviewed
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