1 10 2 https://theses.otagogeology.org.nz/files/original/54a65a52b664092f4c864fbecf6bfeeb.pdf f67735fe7d46f366e5d21931f4846aa3 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 ((163.51796987207328 -79.117033434886579,163.316711702873562 -79.250702116712105,162.587428940190193 -79.20637268614216,161.374780120602281 -79.12804342787328,159.852029996568433 -79.021251358902745,160.054225218050334 -78.909021516065479,160.174069596234887 -78.841362589513821,160.195221475082519 -78.829331620800204,160.240202151822842 -78.803656908542351,160.267247414585256 -78.788160294046023,160.444048222510474 -78.68574345949186,160.550735279900863 -78.622993460720011,161.132484113033513 -78.267675565089718,161.369320508132802 -78.116330973777607,161.37788099027614 -78.110784801515251,161.432520491913806 -78.075258242852868,161.49739750788649 -78.080055046342423,161.839747257784694 -78.105059450528444,161.994023113846879 -78.116159074052405,162.007047389816393 -78.117091362381188,162.392982814988756 -78.144381942682159,162.521412492366551 -78.153320528971605,162.544050376938856 -78.154888735378563,162.549828014784254 -78.155288619674636,162.567466868901477 -78.156508558872986,162.627000327708657 -78.160616138052802,162.752444164408416 -78.169221494525672,163.022634293744574 -78.187527903959761,163.05659484093735 -78.189806869804784,163.428357826602706 -78.214435253501506,163.441323801388563 -78.215283696950735,163.604408787668177 -78.225895082769853,163.620311001580717 -78.226923820518422,163.94341198329613 -78.247597118927885,164.086523095636579 -78.256615260407415,164.262323738480376 -78.267577413480822,164.372748812889512 -78.274397914040435,164.470315588489228 -78.280382530086953,164.556468589723067 -78.285634608412707,164.632111397920994 -78.29022093665516,164.65660632974587 -78.291701089635879,164.656606843479665 -78.291701120721555,164.630777329187936 -78.311839110512864,164.612216200999711 -78.326266762639165,164.557982328973793 -78.368215768190026,164.553163972372346 -78.371927828837343,164.477628770719463 -78.429805959042625,164.45392014501607 -78.44785151447914,164.364955183519925 -78.515057268720028,164.359704446412479 -78.518998847651645,164.265856514741841 -78.58898501930031,164.260074502234716 -78.593268427651708,164.152964126278192 -78.672027861183167,164.125787870668546 -78.691834506770746,163.949080296831397 -78.81891635445821,163.678871259895828 -79.007691262474765,163.51796987207328 -79.117033434886579)) Author last name Last name of the Author Read Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Cooper, Alan Reay, A. Palin, J.M. Abstract The Abstract for this thesis The Koettlitz Glacier Alkaline Province, in southern Victoria Land, Antarctica, is characterised by Late Neoproterozoic, extension-related plutonism. Stretching 100 kilometres along the Hillary Coast from the Radian Glacier, in the north, to the Mulock Glacier, in the south, the Koettlitz Glacier Alkaline Province is exposed over at least 2000 km². The oldest intrusions dated during this study are mafic members of the Glee Suite, a suite ranging from 46 wt% SiO₂ alkaline gabbros to 68 wt% SiO₂ quartz monzonites that crop out in the north of the studied area, between the Kempe and Panorama Glaciers. Enriched in Ti, Fe, Mn, K, P & Ba, the Glee Suite comprises borderline subalkaline/alkaline, metaluminous, calc-alkalic/alkali-calcic, transitional basalts and derivatives. Initial epsilon Nd ( -2.58) and initial ⁸⁷Sr/⁸⁶Sr (0.708) values are more primitive than most nearby intrusions, indicating lesser crustal input in the Glee Suite. Zircon ages of 553 ± 5 Ma & 550 ± 5 Ma date emplacement, while titanite ages of 538 ± 2 Ma & 534 ± 1 Ma date subsequent deformation then cooling. Geochemical characteristics of the Glee Suite imply emplacement into a failed intra-continental rift. The alkaline gabbroic components of the Glee Suite are geochemically equivalent to alkaline components of the nearby Panorama Pluton and Dromedary Mafic Complex. The Skelton Mafic Suite, which crops out on both sides of the Skelton Glacier in the vicinity of Cocks Bluff, ranges from magnesian, calcic, 48 wt% SiO₂ gabbros to ferroan, calc-alkalic, 59 wt% SiO₂ monzonites. This array is a result of fractional crystallisation from a gabbroic end member such as sampled at Breezy Bluff, one kilometre northeast of Cocks Bluff. Zircon and titanite from the Skelton Mafic Suite have been dated at 548 ± 2 Ma and 547 ± 4 Ma, respectively, indicating emplacement at this time. The subalkaline Skelton Mafic Suite is part of a broader mafic association within the Koettlitz Glacier Alkaline Province that contains both subalkaline and alkaline components. This association includes the Panorama Pluton (557 ± 5 Ma) and the Dromedary Mafic Complex. The outcrop characteristics and geochemical nature of these subalkaline-alkaline mafic intrusions indicate emplacement in a transitional compressional / extensional tectonic setting. The most characteristic suite in the Koettlitz Glacier Alkaline Province is the Hillary Suite that comprises high-silica, A₂ group, A-type granitoids and subordinate syenites. Members of the Hillary Suite are enriched in Si, Fe, Na, K, Ga, Nb, La, Nd, Rb, Y, Pb, Th & U and depleted in Al, Mg, Ca, Ba & Sr. Strong enrichment in REE, particularly the LREE (La(N)/Lu(N)=5-40), and large negative Eu anomalies (Eu/Eu*=0.04-0.53) are apparent in all samples. The Sm-Nd & Rb-Sr isotopic character of the Hillary Suite (initial epsilon Nd = -4.5 to -7.5 and initial ⁸⁷Sr/⁸⁶Sr 0.708-0.710) suggests derivation from crustal rather than mantle source rocks. New Hillary Suite emplacement ages of 550 ± 3 Ma, 548 ± 4 Ma, 546 ± 3 Ma, 546 ± 3 Ma and 542 ± 3 Ma are all Late Neoproterozoic. The geochemical nature, geographic spread and emplacement ages of the Hillary Suite indicate that the Koettlitz Glacier Alkaline Province was the site of broad crustal extension during the Late Neoproterozoic. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/5428">http://hdl.handle.net/10523/5428</a> OURArchvive access level Open Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. southern Victoria Land, Antarctica Thesis description Number of pages, maps, CDs, etc. 630pp total 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 2010Read Creator An entity primarily responsible for making the resource Read, Stephen E 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 Koettlitz Glacier Alkaline Province : Late Neoproterozoic extensional magmatism in southern Victoria Land, Antarctica Subject The topic of the resource Plutonic Alkaline Province Antarctica https://theses.otagogeology.org.nz/files/original/de79612ccaa02ea6119cb0b14842e777.pdf 206dc4b2a55eeb9ae4261b60cb8c2d29 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 ((170.442099057000064 -43.275102757999946,170.44502207000005 -43.278173656999968,170.421434206000072 -43.291143788999932,170.418464629000027 -43.292775906999964,170.404665164000107 -43.293726095999943,170.372928227000102 -43.295905167999933,170.360440035000124 -43.302781867999954,170.353563507000104 -43.306567215999962,170.322519862000036 -43.323644735999949,170.317846517000021 -43.319093310999961,170.306279878000055 -43.307824707999941,170.292617982000024 -43.294508121999968,170.31961629500006 -43.279513173999931,170.329325213000061 -43.274117393999973,170.332350555000062 -43.27243567499994,170.33496896500003 -43.270980018999978,170.353544354000064 -43.274545855999975,170.354990999000051 -43.274823416999936,170.364532024000027 -43.276653480999983,170.375682574000052 -43.27879110899994,170.403686116000017 -43.262966338999945,170.421092176000116 -43.248377061999975,170.446544923000033 -43.248860239999942,170.449952314000029 -43.249026593999986,170.458512386000052 -43.249217829999964,170.453607785000031 -43.253149579999956,170.442428166000013 -43.262108943999976,170.439675289000093 -43.27255607099994,170.442099057000064 -43.275102757999946)) Author last name Last name of the Author Read Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Norris, R.J. Abstract The Abstract for this thesis The Alpine Fault south and east of Whataroa consists of two northeasterly striking thrust segments ~8 kilometres long linked by an easterly striking strike-slip segment -6 kilometres long. This structural assemblage is one of the largest geometrical_ irregularities south of the Maruia bend. The geometry of the segmentation requires that the dip of the Alpine Fault at depths of a few kilometres should be greatest near the eastern end of the strike-slip segments where they intersect the southwest ends of the thrust segments. Orientations of the mylonitic foliation, which appear to mirror the Alpine _Fault, are compatible with this requirement, dipping -40° SE at the western end of the strike-slip segment and -56° SE near the southwestern end of the eastern thrust segment. The outcrop distribution of the mylonites is compatible with the suggested segmentation geometry, with higher grade rocks towards the western end of the strike-slip segment. Large scale block rotation is evident within a zone -4 kilometres long and up to several hundred metres across. This zone is bounded to the north by the strike-slip segment striking 080° and to the south by a large fault with a linear trace striking 070°. Foliation within the zone appears to have been rotated 40° in a clockwise sense with respect to foliation to the south of the 070° striking fault. The change in strike occurs within a distance of 5-l 0 metres of the latter fault. Foliation dip does not change abruptly across the fault, suggesting that the rotation occurred about a subvertical axis. The clockwise sense of rotation of the foliation is compatible with a dextral sense of shear between the river flats to the north and the range-front to the south. Foliation strike within 1-2 kilometres of the extrapolated intersection of the western thrust segment and the strike-slip segment swings -37° northward as the intersection is approached from the south and southwest. This change is coupled with a lessening in the dip of -24°. These changes are compatible with gravity driven flexure of the hanging wall as it nears the surface. An approximately 3.5 kilometre long, steeply west-dipping normal fault scarp on the true right of the Whataroa River records collapse of the range front during the late Pleistocene. iii I I I I I I I I I I I I I I I r Most of the feldspars in. the mylonites have both oligoclase cores and rims indicating that: (1) the protolith for the mylonites was oligoclase zone schist, and (2) most of the mylonitisation occurred under oligoclase zone, amphibolite facies conditions. Between -50 and 200 metres away from the Alpine Fault a pod of ultramylonite has been retrogressed. In one of these rocks calcic-albite rims (-An7) around sodic-oligoclase cores ( -An12) indicate that the recrystallisation occurred at the top of the peristerite solvus near the second oligoclase isograd. This indicates that at least some of the mylonitisation occurred unde'r garnet zone, transitional amphibolite facies conditions. c Retrogression of biotite to chlorite occurred under greenschist facies conditions below the biotite isograd in these ultramylonites. The feldspar grains did not re-equilibrate to greenschist facies conditions. Xenoliths of probable Greenland Group in shears around the margins of two granite intrusions suggest that the granitoid intrusions west of the Alpine Fault were intruded into Greenland Group basement. IV I ' ! Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Gaunt Creek Little Man River Whataroa Thesis description Number of pages, maps, CDs, etc. vii, 112, xiv leaves : ill. (some col.), maps (some col.) ; 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 1994Read Creator An entity primarily responsible for making the resource Read, Stephen Edward. Date A point or period of time associated with an event in the lifecycle of the resource 1994 Title A name given to the resource Alpine fault segmentation and range front structure between Gaunt Creek and Little Man River, near Whataroa, central Westland, New Zealand Subject The topic of the resource Structural geology Alpine Fault fluvioglacial deposits Greenland Group Haast Schist Group range front structure Whataroa River