Alan P Boyle | University of Liverpool (original) (raw)

I'm interested in microstructures and what they reveal about mineral growth and deformation mechanisms. Over the last few years I have been working on garnet/quartz in metamorphic rocks and on sulphide minerals in ore deposits. I have just started looking at microstructures developed in cementless sustainable concretes.

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Papers by Alan P Boyle

Reports of chloride substitution in common natural sulphides are lacking but are predictably infl... more Reports of chloride substitution in common natural sulphides are lacking but are predictably influenced by key variables in hydrothermal systems including T, pH, Eh aCl-, and aHS-. Materials scientists have long recognized that "II-VI compounds" (e.g. sphalerite) may accommodate halogens with charge balance maintained by cation deficiencies (e.g. Zn1- 0.5xS1-xClx). The majority of around 200 analyses of sphalerite from the Century Zinc mine (NW Queensland) reveal chlorine above electron microprobe detection limits with a maximum of ca 2200 ppm. The analyses support the Zn deficiency substitution although a small subset reveal a 1:1 (molar) correlation of Cl with the highest (Cu+Ag) implying an additional coupled substitution mechanism. Colloform sphalerite from the Galmoy mine (Ireland) has variable concentrations of Cl up to 6000 ppm in growth zones also displaying variations of Fe and Cd. The chlorine content of sphalerite may therefore provide a new tool to characterize...

Interpretation of mineral textures is an important part of understanding any ore deposit. Current... more Interpretation of mineral textures is an important part of understanding any ore deposit. Currently, this mostly involves viewing polished surfaces using a reflected light microscope (sometimes with etching) coupled sometimes with collecting backscatter electron images in a scanning electron microscope and chemical maps using an electron microprobe and rarely with transmission electron microscopy. It is now possible, routinely, to collect crystallographic information at the sub-micron scale to an accuracy typically better than 1º using electron backscatter diffraction (EBSD). Crystallographic data acquired by EBSD help to constrain the interpretation of textures (primary and secondary), commonly providing solutions not contemplated using other analytical methods.

Planet, 2006

Planet No. 17 December 2006 34 Abstract While semesterisation and modularisation of courses may h... more Planet No. 17 December 2006 34 Abstract While semesterisation and modularisation of courses may have had some benefits, there are clear cases where fitting all subject areas into standardised modules has not been beneficial. This paper considers the issue of decreased student ...

ABSTRACT The studied sample presents garnet textural sector-zoning as inclusions in two types in ... more ABSTRACT The studied sample presents garnet textural sector-zoning as inclusions in two types in garnet schist from Morlaix, North-West Brittany, France. Crystal size distributions (CSD) of quartz crystals were measured in both types inclusions, in the matrix and strain shadows around garnet porphyroblasts using Back-scatter electron (BSE) images. The CSD plots of quartz crystals show an increase of average in sizes from type 1 inclusion, 60 μm, to the matrix,116 μm, and strain shadow, 248 μm,. These differences could be explained of quartzes size distribution by many processes such as capturing by pophyroblast, crystal face, annealing and grain boundary migration .

Reports of chloride substitution in common natural sulphides are lacking but are predictably infl... more Reports of chloride substitution in common natural sulphides are lacking but are predictably influenced by key variables in hydrothermal systems including T, pH, Eh aCl-, and aHS-. Materials scientists have long recognized that "II-VI compounds" (e.g. sphalerite) may accommodate halogens with charge balance maintained by cation deficiencies (e.g. Zn1- 0.5xS1-xClx). The majority of around 200 analyses of sphalerite from the Century Zinc mine (NW Queensland) reveal chlorine above electron microprobe detection limits with a maximum of ca 2200 ppm. The analyses support the Zn deficiency substitution although a small subset reveal a 1:1 (molar) correlation of Cl with the highest (Cu+Ag) implying an additional coupled substitution mechanism. Colloform sphalerite from the Galmoy mine (Ireland) has variable concentrations of Cl up to 6000 ppm in growth zones also displaying variations of Fe and Cd. The chlorine content of sphalerite may therefore provide a new tool to characterize...

Interpretation of mineral textures is an important part of understanding any ore deposit. Current... more Interpretation of mineral textures is an important part of understanding any ore deposit. Currently, this mostly involves viewing polished surfaces using a reflected light microscope (sometimes with etching) coupled sometimes with collecting backscatter electron images in a scanning electron microscope and chemical maps using an electron microprobe and rarely with transmission electron microscopy. It is now possible, routinely, to collect crystallographic information at the sub-micron scale to an accuracy typically better than 1º using electron backscatter diffraction (EBSD). Crystallographic data acquired by EBSD help to constrain the interpretation of textures (primary and secondary), commonly providing solutions not contemplated using other analytical methods.

Planet, 2006

Planet No. 17 December 2006 34 Abstract While semesterisation and modularisation of courses may h... more Planet No. 17 December 2006 34 Abstract While semesterisation and modularisation of courses may have had some benefits, there are clear cases where fitting all subject areas into standardised modules has not been beneficial. This paper considers the issue of decreased student ...

ABSTRACT The studied sample presents garnet textural sector-zoning as inclusions in two types in ... more ABSTRACT The studied sample presents garnet textural sector-zoning as inclusions in two types in garnet schist from Morlaix, North-West Brittany, France. Crystal size distributions (CSD) of quartz crystals were measured in both types inclusions, in the matrix and strain shadows around garnet porphyroblasts using Back-scatter electron (BSE) images. The CSD plots of quartz crystals show an increase of average in sizes from type 1 inclusion, 60 μm, to the matrix,116 μm, and strain shadow, 248 μm,. These differences could be explained of quartzes size distribution by many processes such as capturing by pophyroblast, crystal face, annealing and grain boundary migration .

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