1 10 3 https://theses.otagogeology.org.nz/files/original/8c0f4b955548236ab5df9924e39f844b.pdf 5b80211f877abfc9e0a44e1e27b31808 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 ((170.172210263390298 -44.560617163716671,170.201671342808538 -44.561105176890734,170.20010998088361 -44.583218533755392,170.170827301195686 -44.582258153757493,170.172210263390298 -44.560617163716671)) Author last name Last name of the Author Webster Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Toy, V.G. Abstract The Abstract for this thesis The microstructural deformation processes that occur during earthquakes and how these are represented in the fault rocks are not well understood. As cataclastic fault rock is formed, there is an evolution of particle size distribution and formation of different particle shapes. Three faults were investigated in the Loch Laird Recreational Reserve, Benmore, Waitaki, which have accommodated varying amounts of slip (0.64 - 6.8m). Using high-resolution imaging capabilities on a Scanning Electron Microscope, we produced particle maps that distinguish grains according to their size and shape. These maps were constructed for the main cataclasite components: quartz and feldspar. Particle size distribution (PSD) data indicate that there is no relationship between fractal dimension (D) and amount of slip on the fault plane. The fractal dimension is consistent across all faults regardless of total slip. Therefore, it is proposed that the fractal dimension within cataclasite is established at displacements smaller than those accommodated by these faults. Particle size analysis show that, as particle size decreases, angularity decreases but circularity and convexity increase. From this study alone, it is not possible to infer what effect this change in particle shape has on the frictional strength of the fault. Observations from thin sections and consistency of PSD with theoretical predictions indicate that constrained comminution is the deformation mechanism that initially reduces particle size. Abrasion is thought to be the dominant particle size reduction for relatively smaller particles, inferred by examination of the circularity and convexity shape data. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/5898">http://hdl.handle.net/10523/5898</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Loch Laird Recreational Reserve Benmore Thesis description Number of pages, maps, CDs, etc. xviii, 159 pages A4 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 2015Webster Creator An entity primarily responsible for making the resource Webster, Christopher (Chris) Date A point or period of time associated with an event in the lifecycle of the resource 2015 Title A name given to the resource Cataclastic Processes in Small Scale Faults at Loch Laird Recreational Reserve, Benmore, New Zealand Subject The topic of the resource Structural Geology Brittle Deformation Cataclasite faulting Fractal Dimension Micro-structural Deformation New Zealand Particle Size Distribution https://theses.otagogeology.org.nz/files/original/ce48b98a6dea829284a3bfe4dc34609f.pdf abb05304c66b3de6afeafb8fd4de37b6 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 Author last name Last name of the Author Matthews Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Sibson, R. Abstract The Abstract for this thesis Small-scale faulting of Taratu Formation, exposed along the coast of Otago in southeast New Zealand, can be -seen in isolated outcrops of conjugate normal, conjugate thrust and reverse faults. Many of these structures are comparable to deformation bands described by other authors (Aydin and Johnson, 1983; Antonellini and Aydin, 1994; Joude et al., 2002), where displacement has been accumulated through development and growth of deformation band zones. Through the mapping of vertical sectj.ons, a chronology of faulting has been established, with extensional normal faults offset by thrust and reverse faults. Orientation of regional structures is mirrored extensively by the smaller scale faults, reflecting the tectonic stress field acting at the time of their formation. Normal and thrust faults are therefore inferred to coincide with periods of basin extension and tectonic inversion, respectively. Analysis of extension fractures within the coal (known as cleats) showed that major fractures strike normal to local faults. Both the fractures and faults have formed in response to the prevailing stresses, and at some point there has been a change in the direction of least horizontal stress, along which these structures have formed. As the normal faults are inferred to be synsedimentary, the cleats are postulated as having formed in response to positive tectonic inversion rather than basin extension. The nature of movement (oblique shearing) along the low-angle thrusts has been determined by the orientation of striated material along the fault planes. In contrast, the normal faulting involves almost pure dip slip. Geochemical analysis of a large reverse fault near Wangaloa shows that fluids are highly mobile within the fault zone, elevating levels of clay minerals and certain trace metals. Where the smaller faults offset coal beds within the quartz conglomerates, sandstones and siltstones, smearing of coal and cataclasis has occurred along the fault plane. Reduction of porosity along these faults may provide sites for fault sealing and the subsequent restriction of permeability. Subsequently, while the large-scale fault provides a pathway for fluid migration, small-scale faults are found to act as barriers to fluid flow. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Otago coast Thesis description Number of pages, maps, CDs, etc. 63, [11] leaves : ill. (some col., 1 folded) : 30 cm. 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 2003Matthews Creator An entity primarily responsible for making the resource Matthews, Abby. Date A point or period of time associated with an event in the lifecycle of the resource 2003 Title A name given to the resource Small-scale faulting and fault sealing in Taratu formation, coastal Otago Subject The topic of the resource Structural geology faulting Taratu Formation https://theses.otagogeology.org.nz/files/original/51ea92ad16f14f64ff99ae7bf86f9911.pdf 85da179345b75a342e91b4a983757b8e 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 Author last name Last name of the Author Scadden Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Abstract The Abstract for this thesis Fracture patterns were studied on the Owaka Anticline and Southland Syncline of the Southland Synclinorium. Jointing was found to be dominated by two sets, both at right angles to bedding. J1 is perpendicular to the Synclinorium axis, while J2 is parallel. J3, thought to represent conjugate shear joints, is also important. 5 other joint sets were recognised. A possible origin is proposed relating jointing to interaction between the probable external and residual stress fields during the deformation, uplift and relaxation cycle. Comparison of faults shown on existing maps with the lineament pattern obtained from a study of LANDSAT imagery resulted in 6 fault sets being recognised. 3 are thought to be the result of an extensional, block-faulting regime in the late Cretaceous, while 2 others are postulated to result from bending of the Synclinorium in the Kaikoura Orogeny. An accord between a mathematical model for bending of the Synclinorium and the observed fracture pattern is demonstrated. The final fault set is a lineament grouping only and its origin is unknown. From existing maps and from this study, a structurHl synthesis is attempted. The Southland Synclinorium if; a non-cylindrical, asymmetrical synclinorium, plunging S.E. with an axial trend ranging 105-·130. The folds are probably near concentric with tightness varying along its length. Folding took place in the Rangitata Orogeny but has been modified during the Kaikoura Orogeny. Flexural s1ip/flow is thought to have been the dominant process of folding though longitudinal tangential strain may have been important in the hinge zone. There is some evidence that the principal compressive stress was not quite perpendicular to the axis. Finally a possible tectonic history of the Synclinorium is given. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Southland Thesis description Number of pages, maps, CDs, etc. 86 leaves. Diagms, photos, 30 cm. 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 1979Scadden Creator An entity primarily responsible for making the resource Scadden, PG Date A point or period of time associated with an event in the lifecycle of the resource 1979 Title A name given to the resource Fracture Patterns in the Southland Synclinorium. Subject The topic of the resource Structural geology faulting joint origin joints North Peak Flexure structural synthesis