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  • JOURNAL ARTICLE
    Monroy R, Zdravkovic L, Ridley AM, 2015,

    Mechanical behaviour of unsaturated expansive clay under K-0 conditions

    , ENGINEERING GEOLOGY, Vol: 197, Pages: 112-131, ISSN: 0013-7952
  • JOURNAL ARTICLE
    Morel CRG, van Reeuwijk M, Graf T, 2015,

    Systematic investigation of non-Boussinesq effects in variable-density groundwater flow simulations

    , JOURNAL OF CONTAMINANT HYDROLOGY, Vol: 183, Pages: 82-98, ISSN: 0169-7722
  • JOURNAL ARTICLE
    Mostaghimi P, Percival JR, Pavlidis D, Ferrier RJ, Gomes JLMA, Gorman GJ, Jackson MD, Neethling SJ, Pain CCet al., 2015,

    Anisotropic Mesh Adaptivity and Control Volume Finite Element Methods for Numerical Simulation of Multiphase Flow in Porous Media

    , MATHEMATICAL GEOSCIENCES, Vol: 47, Pages: 417-440, ISSN: 1874-8961
  • CONFERENCE PAPER
    Muxworthy AR, Bland PA, Collins G, Moore Jet al., 2015,

    MAGNETIC FABRICS IN ALLENDE: IMPLICATIONS FOR MAGNETIC REMANENCE ACQUISITION.

    , 78th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, ISSN: 1086-9379
  • BOOK CHAPTER
    O Driscoll B, Ferré EC, Stevenson CTE, Magee Cet al., 2015,

    The significance of magnetic fabric in layered mafic-ultramafic intrusions

    , Layered Intrusions, Pages: 295-329, ISBN: 9789401796521

    © Springer Science+Business Media Dordrecht 2015. Anisotropy of magnetic susceptibility (AMS) has been recognised as a well-established fabric analysis tool for intrusive igneous rocks since the 1990s. The AMS technique provides directional information for magnetic foliation and magnetic lineation fabric components of the AMS ellipsoid, potentially coupled with a quantification of the overall fabric strength and geometry. The magnetic susceptibility (and therefore the AMS) of igneous rocks is often dominated by ferromagnetic mineral phases such as magnetite or low-Ti titanomagnetite, even where present in very minor amounts (e.g., ~ 0.1 vol.%). Fe-bearing silicates exhibit subordinate paramagnetic behaviour but are volumetrically much more important constituents of igneous rocks than Fe-Ti oxides, so may also contribute considerably to the AMS. A significant application of AMS is in the characterisation, constraint and quantification of very weak or subtle mineral fabrics related to flow or tectonic deformation. In particular, studies of magnetic fabrics in sheet intrusions and in granite plutons have enormously enhanced our understanding of the magma flow regimes and emplacement kinematics in these settings. Studies of AMS in layered maficultramafic intrusions have been comparatively sparse. This is despite the fact that magnetic fabrics from layered cumulates may provide information on a range of magma chamber processes, from initial magma emplacement to cumulate textural evolution and solidification, if accompanied by careful petrographic documentation and an understanding of the ‘magnetic mineralogy’ of the rock. A wide array of rock magnetic and complementary quantitative fabric analysis techniques can be employed to support an AMS dataset in this regard. With studies of layered mafic-ultramafic intrusions currently proceeding at unprecedented (micro-)scales of textural and geochemical detail, AMS offers petrologists a unique approach to invest

  • JOURNAL ARTICLE
    Ormoe J, Melero-Asensio I, Housen KR, Wuennemann K, Elbeshausen D, Collins GSet al., 2015,

    Scaling and reproducibility of craters produced at the Experimental Projectile Impact Chamber (EPIC), Centro de Astrobiologia, Spain

    , METEORITICS & PLANETARY SCIENCE, Vol: 50, Pages: 2067-2086, ISSN: 1086-9379
  • JOURNAL ARTICLE
    Ouimet W, Dethier D, Bierman P, Wyshnytzky C, Shea N, Rood DHet al., 2015,

    Spatial and temporal variations in meteoric Be-10 inventories and long-term deposition rates, Colorado Front Range

    , QUATERNARY SCIENCE REVIEWS, Vol: 109, Pages: 1-12, ISSN: 0277-3791
  • JOURNAL ARTICLE
    Patruno S, Hampson GJ, Jackson CA-L, 2015,

    Quantitative characterisation of deltaic and subaqueous clinoforms

    , EARTH-SCIENCE REVIEWS, Vol: 142, Pages: 79-119, ISSN: 0012-8252
  • JOURNAL ARTICLE
    Patruno S, Hampson GJ, Jackson CA-L, Dreyer Tet al., 2015,

    Clinoform geometry, geomorphology, facies character and stratigraphic architecture of a sand-rich subaqueous delta: Jurassic Sognefjord Formation, offshore Norway

    , Sedimentology, Vol: 62, Pages: 350-388

    The integration of core sedimentology, seismic stratigraphy and seismic geomorphology has enabled interpretation of a sand-prone subaqueous delta in the Upper Jurassic Sognefjord Formation of the Troll Field, Horda Platform, offshore Norway. Mud-prone subaqueous deltas characterised by a compound clinoform morphology are common in many modern tide- and wave-influenced settings, but ancient examples are rarely reported. The Sognefjord Formation data therefore demonstrate the criteria for recognition of subaqueous deltas in the stratigraphic record, as well as refining the depositional model of the main reservoir in the super-giant Troll oil and gas field. Two 10-60 m thick, wave-dominated, regressive-transgressive packages bounded by major marine flooding surfaces are distinguished in the lower Sognefjord Formation. Each regressive-transgressive package corresponds to a set of seismically resolved, westerly-dipping clinoforms, and its bounding surfaces form the seismic “envelope” of a clinoform set. The packages thicken westwards, until they reach a maximum where the clinoform “envelope” rolls over to define a topset-foreset-toeset geometry at the position of maximum regression. Both individual clinoforms and reflections bounding the clinoform sets are oriented sub-parallel to the edge of the Horda Platform (N005-N030). In the eastern half of the field, individual clinoforms are relatively gently dipping (1°-6°) and bound thin (10-30 m) clinothems dominated by fine-grained, hummocky cross-stratified sandstones. Towards the west, clinoforms gradually become steeper (5°-14°) and bound thicker (15-60 m) clinothems that comprise medium-grained, cross-bedded sandstones in their upper parts. Topsets are consistently well developed, except in the westernmost area, where some clinoform foresets are top-truncated. No evidence of subaerial exposure is observed. We interpret deposition by fully subaqueous, near-linear clinoforms that pro

  • JOURNAL ARTICLE
    Patruno S, Hampson GJ, Jackson CA-L, Whipp PSet al., 2015,

    Quantitative progradation dynamics and stratigraphic architecture of ancient shallow-marine clinoform sets: a new method and its application to the Upper Jurassic Sognefjord Formation, Troll Field, offshore Norway

    , BASIN RESEARCH, Vol: 27, Pages: 412-452, ISSN: 0950-091X
  • JOURNAL ARTICLE
    Pearce JA, Reagan MK, Petronotis K, Morgan S, Almeev R, Avery AJ, Carvallo C, Chapman T, Christeson GL, Ferré EC, Godard M, Heaton DE, Kirchenbaur M, Kurz W, Kutterolf S, Li H, Li Y, Michibayashi K, Nelson WR, Prytulak J, Python M, Robertson AHF, Ryan JG, Sager WW, Sakuyama T, Shervais JW, Shimizu K, Whattam SAet al., 2015,

    Izu-Bonin-Mariana fore arc: Testing subduction initiation and ophiolite models by drilling the outer Izu-Bonin-Mariana fore arc

    , Integrated Ocean Drilling Program: Preliminary Reports, ISSN: 1932-9423

    © 2014, IODP-MI. All rights reserved. The objectives for Expedition 352 were to drill through the entire volcanic sequence of the Bonin fore arc to 1. Obtain a high-fidelity record of magmatic evolution during subduction initiation and early arc development, 2. Test the hypothesis that fore-arc basalt lies beneath boninite and understand chemical gradients within these units and across the transition, 3. Use drilling results to understand how mantle melting processes evolve during and after subduction initiation, and 4. Test the hypothesis that the fore-arc lithosphere created during subduction initiation is the birthplace of suprasubduction zone (SSZ) ophiolites. Expedition 352 successfully cored 1.22 km of igneous basement and 0.46 km of over-lying sediment, providing diverse, stratigraphically controlled suites of fore-arc basalts (FAB) and boninite related to seafloor spreading and earliest arc development. FAB were recovered at the two deeper water sites (U1440 and U1441) and boninites at the two sites (U1439 and U1442) drilled upslope to the west. FAB lavas and dikes are depleted in high-field strength trace elements such as Ti and Zr relative to mid-ocean-ridge basalt but have relatively diverse concentrations of trace elements bezcause of variation in degrees of melting and amount of subducted fluids involved in their genesis. All FAB magmas underwent significant crystal fractionation in a persistent magma chamber system. Holes U1439C and U1442A yielded entirely boninitic lavas. We defined three boninite differentiation series based on variations in MgO, SiO 2 , and TiO 2 concentrations of the parental magmas. Lavas in both pairs of holes have compositions that generally become more primitive and have lower TiO 2 concentrations upward. The presence of dikes at the base of the sections at Sites U1439 and U1440 provides evidence that boninitic and FAB lavas are both underlain by their own conduit systems and that FAB and boninite group lavas are likely

  • JOURNAL ARTICLE
    Pelecanos L, Kontoe S, Zdravkovic L, 2015,

    A case study on the seismic performance of earth dams

    , GEOTECHNIQUE, Vol: 65, Pages: 923-935, ISSN: 0016-8505
  • SOFTWARE
    Piggott MD, 2015,

    OpenTidalFarm

    OpenTidalFarm is an open-source software for simulating and optimising tidal turbine farms.The positioning of the turbines in a tidal farm is a crucial decision. Simulations show that the optimal positioning can increase the power generation of the farm by up to 50% and can therefore determine the viability of a project. However, finding the optimal layout is a difficult process due to the complex flow interactions. OpenTidalFarm solves this problem by applying an efficient optimisation algorithm onto a accurate flow prediction model.

  • JOURNAL ARTICLE
    Portenga EW, Bierman PR, Duncan C, Corbett LB, Kehrwald NM, Rood DHet al., 2015,

    Erosion rates of the Bhutanese Himalaya determined using in situ-produced Be-10

    , GEOMORPHOLOGY, Vol: 233, Pages: 112-126, ISSN: 0169-555X
  • JOURNAL ARTICLE
    Potter RWK, Kring DA, Collins GS, 2015,

    Scaling of basin-sized impacts and the influence of target temperature

    , Special Paper of the Geological Society of America, Vol: 518, Pages: 99-113, ISSN: 0072-1077

    © 2015 The Geological Society of America. All rights reserved. We produce a set of scaling laws for basin-sized impacts using data from a suite of lunar basin numerical models. The results demonstrate the importance of preimpact target temperature and thermal gradient, which are shown to greatly influence the modification phase of the impact cratering process. Impacts into targets with contrasting thermal properties also produce very different crustal and topographic profiles for impacts of the same energy. Thermal conditions do not, however, significantly influence the excavation stage of the cratering process; results demonstrate, as a consequence of gravity-dominated growth, that transient crater radii are generally within 5% of each other over a wide range of thermal gradients. Excavation depth-to-diameter ratios for the basin models (~0.12) agree well with experimental, geological, and geophysical estimates, suggesting basins follow proportional scaling. This is further demonstrated by an agreement between the basin models and Piscaling laws based upon first principles and experimental data. The results of this work should also be applicable to basin-scale impacts on other silicate bodies, including the Hadean Earth.

  • JOURNAL ARTICLE
    Prelat A, Hodgson DM, Hall M, Jackson CA-L, Baunack C, Tveiten Bet al., 2015,

    Constraining sub-seismic deep-water stratal elements with electrofacies analysis; A case study from the Upper Cretaceous of the Maloy Slope, offshore Norway

    , MARINE AND PETROLEUM GEOLOGY, Vol: 59, Pages: 268-285, ISSN: 0264-8172
  • JOURNAL ARTICLE
    Prelat A, Pankhania S, Jackson CA-L, Hodgson DMet al., 2015,

    Slope gradient and lithology as controls on the initiation of submarine slope gullies; insights from the North Carnarvon Basin, Offshore NW Australia

    , Sedimentary Geology, Vol: 329, Pages: 12-17, ISSN: 0037-0738

    Slope-confined submarine gullies are present on many continental margins, yet the controls on their initiation and demise are poorly understood because modern or recently active systems are rarely if ever monitored, and exhumed systems, typically formed in very fine-grained successions, are poorly preserved at outcrop. We use 3D seismic reflection and borehole data from offshore NW Australia to investigate long-term (~ 40 Myr) variations in the geomorphology of Eocene-to-Miocene gullies that developed in mixed carbonate–clastic clinothems. Through time, clinoform slope gradient increases from 1.6° to 3.2°, with gullies forming when the clinoform slope exceeds 2.5°. After their inception, gullies increase in width (from 350 m to 770 m) and depth (from 37 m to 60 m). Slope steepening appears to coincide with a change from poorly cemented, fine-grained carbonate to better-cemented, coarse-grained carbonate, implying a secondary, lithological control on slope dip and, ultimately, gully formation.

  • JOURNAL ARTICLE
    Pupim FDN, Bierman PR, Assine ML, Rood DH, Silva A, Merino ERet al., 2015,

    Erosion rates and landscape evolution of the lowlands of the Upper Paraguay river basin (Brazil) from cosmogenic Be-10

    , GEOMORPHOLOGY, Vol: 234, Pages: 151-160, ISSN: 0169-555X
  • JOURNAL ARTICLE
    Reeve MT, Bell RE, Duffy OB, Jackson CA-L, Sansom Eet al., 2015,

    The growth of non-colinear normal fault systems; What can we learn from 3D seismic reflection data?

    , JOURNAL OF STRUCTURAL GEOLOGY, Vol: 70, Pages: 141-155, ISSN: 0191-8141
  • JOURNAL ARTICLE
    Reusser L, Bierman P, Rood D, 2015,

    Quantifying human impacts on rates of erosion and sediment transport at a landscape scale

    , GEOLOGY, Vol: 43, Pages: 171-174, ISSN: 0091-7613

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