Gordon Cressey

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-The rapid phase quantification method using X-ray diffraction (XRD) with a position-sensitive detector (PSD), outlined by Cressey and Schofield (1996), has been extended to facilitate mineral phase quantification of clay-beating samples. In addition, correction factors for differences in matrix absorption effects have been calculated and applied. The(More)
Cristobalite is a common mineral in volcanic ash produced from dome-forming eruptions. Assessment of the respiratory hazard posed by volcanic ash requires understanding the nature of the cristobalite it contains. Volcanic cristobalite contains coupled substitutions of Al3+ and Na+ for Si4+; similar co-substitutions in synthetic cristobalite are known to(More)
Department of Earth Sciences, Durham University, South Road, Durham DH1 3LE, UK, Institute of Hazard, Risk and Resilience, Durham University, South Road, Durham DH1 3LE, UK, Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich 80333, Germany, Camborne School of Mines, College of Engineering, Mathematics and Physical(More)
Introduction: CM carbonaceous chondrites are samples of incompletely serpentinized fragments of primitive asteroids. These meteorites preserve a record of nebular and parent body processes. CMs are composed predominantly of high temperature anhydrous phases and low temperature serpentine family phyllosilicates. Modal data allows for a greater understanding(More)
We have investigated how morphological biosignatures (i.e., features related to life) might be identified with an array of viable instruments within the framework of robotic planetary surface operations at Mars. This is the first time such an integrated lab-based study has been conducted that incorporates space-qualified instrumentation designed for(More)
Airborne total suspended particulates (TSP), dusts from smelter blast furnace and converter stacks, and filtrates of snow melt waters have been characterised in the Cu smelter and former mining town of Karabash, Russia. TSP was collected at sites up- and downwind of the smelter and large waste and tailings dumps (Oct. 2000 and July 2001). Methods for(More)
The use of synchrotron radiation sources for X-ray spectroscopy is a well known and developed field. The majority of applications, however, have been limited to studies of materials containing only a single phase of the element of interest. Owing to limited availability of suitable instrumentation, the study of materials comprising intergrowths of different(More)
PREPARATION FOR THE RETURN OF STARDUST G. A. Graham, A. L. Butterworth, M. J. Burchell, A. T. Kearsley, J. A. Creighton, J. Mann, P. A. Bland, G. Cressey, C. G. Jones , M. M. Grady and I. P. Wright, Planetary and Space Sciences Research Institute (PSSRI), The Open University, Milton Keynes MK7 6AA, U.K (g.a.graham@open.ac.uk), School of Physical Sciences,(More)
Compacted clay liners are common, major, components of landfill leachate (fluid) containment systems. This is sensible, but knowledge and understanding of the longterm performance and behaviour of day mineral/landfill leachate systems remain very limited. The authors studied the reactions of day soil with leachate simulants related to three different(More)