https://theses.otagogeology.org.nz/files/original/8731fddad845f7d965aeb7c008c9d8e6.pdf 61db16121097959ba807d092b15b09c5 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((170.077623295189767 -43.401979878992819,170.073324524716924 -43.516515094733009,169.909510835274403 -43.511307434252778,169.910024478114963 -43.396974725428358,170.077623295189767 -43.401979878992819)) Author last name Last name of the Author Reid-Lindroos Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Toy, V.G. Abstract The Abstract for this thesis Vein characteristics and textures, particulary crystallographic preferred orientations (CPO) were investigated using computer integrated polarisation microscopy (CIP) in ~20 quartz veins over the course of this study. Grain size and grain shape preferred orientation (GSPO) were also analysed. Samples were taken from a fault perpendicular section within the hanging-wall mylonites of the Alpine Fault in Cataclasite Creek on the West Coast of the South Island, New Zealand. The quartz veins occur within two different mylonitic lithologies; quartzofeldspathic mylonite and metabasic mylonite (~30-40% total mylonite volume). The proportion of metabasic to quartzofeldspathic mylonite may have implications for localised fault behaviour and amount of dip-slip movement on the Alpine Fault. The quartz veins mostly lie at low angle to or parallel to the mylonitic foliation. These veins may initially have formed in three different scenarios, each of which should produce a different final CPO; (1) veins inherited from the Alpine Schists which were already deformed before incorporation into the mylonite zone, (2) veins opened parallel to foliation at depth within the mylonite zone, and (3) veins opened at high angle to foliation at depth within the mylonite zone. In all three scenarios we expect an original CPO within the veins. The samples display CPOs ranging from crossed girdles, representative of low temperature basal <a> glide to concentrated Y-maxima fabrics characteristic of prism <a> glide, and possible constrictional fabrics. CPOs within quartzofeldspathic and metabasic mylonites differ significantly. The metabasic mylonites have more grains favourably oriented for prism <a> glide, and some indicate antithetic sense of shear to adjacent quartzofeldspathic mylonites, and to the overall sense of shear within the Alpine Fault zone. Several veins within both lithologies have a domainal CPO, which may indicate that they have not undergone enough recrystallisation to completely change the initial CPO, or that different starting orientations responded differently to the same deformation. In either case, preservation of these domains suggests these veins were generated within the mylonite zone rather than inherited from the Alpine Schist. The large variation in CPO between veins hosted in quartzofeldspathic and metabasic lithologies suggests the rheologically distinct metabasic pods may either shield quartz veins from deformation, or focus deformation into them. GSPOs appear to be correlated with dominant quartz slip system; samples displaying prism <a> and rhomb <a> slip have GSPOs at higher angle to the foliation than those exhibiting basal <a> slip. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Alpine Fault Thesis description Number of pages, maps, CDs, etc. 95 leaves : ill., 1 folded map in pocket ; 30 cm. + 1 CD-ROM (4 3/4 in.) Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2010Reid_Lindroos Creator An entity primarily responsible for making the resource Reid Lindroos, Zoe. Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Variation in characteristic and texture of quartz veins normal to the Alpine Fault Subject The topic of the resource Structural geology Alpine Fault texture of quartz veins