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2016, Wanaka (MP145A) GeoSciences 2016 Geoscience Society of New Geoscience Zealand Annual Conference Society of 28 Nov - 1 Dec 2016 | Wanaka New Zealand Abstracts GeoSciences 2016 Sponsors GOLD SPONSOR SILVER SPONSOR BRONZE SPONSORS ICE BREAKER SPONSOR EXHIBITORS Geoscience Society of New Zealand GEOSCIENCES 2016 Annual Conference of the Geoscience Society of New Zealand 28 November – 1 December 2016, Lake Wanaka Centre, Wanaka ABSTRACT VOLUME Conference Convenors James White (University of Otago) and Rob Smillie (GNS Science, Dunedin) Organising Committee James White, Rob Smillie, Christina Riesselman, Luke Easterbrook-Clarke, Andrew Gorman, Chris Moy, James Scott, Damian Walls, and Dee Roben Administration Janet George (Absolutely Organised Ltd) Programme Convenor Christina Riesselman Theme Organisers Ewan Fordyce, Daphne Lee, Chris Moy, Christina Riesselman, James Scott, Mark Stirling, Virginia Toy, Phaedra Upton, and James White Field Trip Leaders Virginia Toy, Ewan Fordyce, James White, Nick Mortimer, Jon Lindqvist, Daphne Lee, and Mark Stirling Cover Image: LINZ orthophoto 2002-2003 on NZSoSDEM v1.0 15m DEM in Leapfrog Geo. Abstracts are organised in alphabetical order by family name of the first author. The bibliographic reference for abstracts is: Author, A.N. (2016). Title of Abstract. In: Riesselman, C. and Roben, A.(eds). Abstracts, Geosciences 2016, Wanaka, Geoscience Society of New Zealand Miscellaneous Publication 145A. p.x. ISBN 978-1-877480-52-2 ISSN 2230-4495 (online) ISSN 2230-4487 (print) AGE OF PROTOLITHS IN OTAGO AND the overall connectivity and porosity, and is a key MARLBOROUGH SCHIST uncertainty to understand when determining in-place volumes. Experts caution tHat relationsHips between Chris Adams facies and petropHysical properties in carbonate GNS Science, Private Bag 1930, Dunedin 9054 reservoirs cannot be determined without first [email protected] understanding the basin sedimentary and structural history. Detrital zircon age patterns in metagreywackes in Otago and MarlborougH ScHist provide maximum THe Taranaki Basin is a proven and prolific depositional ages for their protolith and define hydrocarbon basin in New Zealand. Within the Basin, terrane ancestry. In eastern Otago, south of the Hyde- and in fact New Zealand, tHe Oligocene Tikorangi Macraes SHear Zone (HMSZ) and Rise & SHine SHear Formation is unique. It is a proven Hydrocarbon Zone (RSSZ), a large proportion of tHe Otago ScHist is producing formation comprised predominantly of Late Triassic witH polymodal zircon age patterns carbonate reservoir, WaiHapa-Ngaere field (early resembling those in lower grade Rakaia Terrane in production 10,000 bopd). Canterbury and Wellington. North of the HMSZ, Late Triassic protolitHs continue but are increasingly Tikorangi Formation comprises a spectrum of displaced by Late Permian protoliths of Rakaia interbedded limestone rock types ranging from Terrane ancestry. In a narrow strip (informally termed calcareous mudstone into wackestone and packstone Hyde-Macraes Block) at tHe HMSZ, tHere is a possible to grainstone. THe Tikorangi Formation is distributed Late Carboniferous protolitH resembling tHat in tHe across tHe entire basin witH fracture porosity and soutHernmost, Carboniferous, sector of tHe New variable permeability. England Orogen accretionary wedge in eastern New SoutH Wales. In tHe western Otago ScHist botH Late In tHis paper, we examine metHods to evaluate Triassic and Early Jurassic protolitHs are present carbonate reservoirs at tHe core and well log scale witHin presently-mapped Aspiring LitHological using the available conventional well log and core Association and Torlesse Composite Terrane. data. The analysis includes a petrophysical evaluation However, tHeir simpler zircon age patterns are very to identify the primary role of Heterogeneity and its similar to tHose in tHe Waipapa Terrane, NortH Island effect on reservoir quality. THis is tHen linked to tHe and possible correlates along tHe east Otago coast. results of the proposed analysis to tHe facies of tHe THis pattern continues nortHwards across tHe Alpine studied formation across tHe field. Fault into tHe MarlborougH ScHist, wHere a Late Triassic to Early Jurassic, Waipapa Terrane protolitH And identification of structural heterogeneities and dominates. No examples of Jurassic, Kaweka Terrane main litHology features in order to evaluate tHe or Early Cretaceous, Pahau Terrane protoliths were potential of possible hydrocarbon deposits in the area found. in addition to understand tHeir effects on tHe ORAL reservoirs Hydrocarbon prospect and oil productivity of the field. ORAL RESERVOIR CHARACTERISATION OF TIKORANGI FORMATION, WAIHAPA-NGAERE FIELD, TARANAKI BASIN, NEW ZEALAND. 1 2 E. YousEF & R. Alnazzal 1 Consultant Petrophysicist, Tregear, NSW, Australia. 2 Geological Advisor, P O Box 80579, Kingdom of Bahrain. [email protected] Over 60% of tHe world’s oil reserves lie in carbonate reservoirs, particularly in the Middle East oilfields. Carbonate depositional environments produce a diverse range of sedimentary facies wHich contain a wide variety of porosity types witH varying degrees of connectivity, producing complex. Carbonates in geological point of view sensitive to post-depositional diagenesis, additionally most carbonate reservoirs contain natural faults and fractures, wHicH influences 1 A LATE PLEISTOCENE RECORD OF 3D MAPPING OF FLUID/ROCK INTERACTION PALEOPRODUCTIVITY VARIATION AND OCEANIC USING STABLE ISOTOPES, MOUNT ISA, CIRCULATION FROM THE GULF OF ALASKA: NORTHWEST QUEENSLAND, AUSTRALIA RESULTS FROM IODP EXPEDITION 341 B. S. AndrEW1, S. L. L. BarkEr1 & R. Lilly2 (SOUTHERN ALASKA MARGIN) 1 ScHool of Science, University of Waikato, New H.J. AndErson1 & C.M. Moy1 Zealand 2 1 Department of Geology, University of Otago, P O Department of EartH Sciences, University of Box 56, Dunedin 9054 Adelaide, Australia [email protected] [email protected] Paleoproductivity records from tHe central Gulf of Carbonate-hosted mineral deposits represent globally Alaska can uncover the mechanisms that control significant mineral deposits, altHougH tHey can be biogeochemical cycling on glacial-interglacial notoriously hard to target during exploration. The timescales. Today, surface waters that overlie Site highly reactive nature of carbonate minerals mean U1417 in tHe subpolar Pacific Ocean are cHaracterised they effectively neutralise acidic fluids, resulting in by high nutrients and low chlorophyll (HNLC), where relatively narrow and poorly developed visible primary production is controlled by micronutrient mineral alteration and litHogeocHemical Halos. (iron) availability. A continuous 92 m sediment record However, interaction between HydrotHermal fluids that contains the last 600,000 years was used to and carbonate rocks is recorded by cHanges in carbon reconstruct surface water productivity variations. A and oxygen isotopes of Host rock and carbonate multi-proxy approach, comprising biogenic silica flux veins. THese cryptic alteration Halos may be large and and concentration, as well as cHanges in tHe isotopic extended well beyond tHe limits of ore or visible compositions of organic matter (δ13C and δ15N), was alteration. THe cost of isotope analysis by isotope used to evaluate relative changes in sediment ratio mass spectrometry (IRMS) and the long constituents. We interpret intervals witH elevated laboratory turn-around times Has precluded tHe use δ13C, δ15N, N/C, and wt. % BiSi to indicate periods of of C and O stable isotopes in mineral exploration. higher productivity combined with reduced influence of glaciogenic sediment delivered by ice rafting, Mount Isa is a world-class base metal deposit Hosted meltwater plumes, and overflow from nearby in a dolomite-ricH Proterozoic sedimentary sequence, Surveyor Fan cHannels. Based on comparison witH witH good exposure as well as a long History of mining and researcH effort. Historical C and O stable isotope regional records, we speculate that productivity 18 increases during deglaciation due to tHe delivery of studies identified a large δ O depletion Halo bioavailable Fe that is released from the adjacent surrounding tHe Mount Isa deposits, wHich is 9 km continental shelves during post glacial sea level rise. long and reacHes up to 2 km beyond visible mineral At the same time, a decrease in ocean stratification alteration Halos. Reactive transport tHeory now allows for upwelling of nitrate and silica ricH deep provides a framework upon which to understand waters to tHe surface providing tHe conditions for an these observations and further develop these tools increase in macronutrient fertilisation and primary for vectoring towards mineralisation. production. Small increases in productivity that occur during glacial periods may be the result of volcanic Historical exploration data and new isotopic analysis asH or an increase in tHe delivery of glacial dust and generated by off-axis integrated cavity out spectroscopy (OA-ICOS) Have been combined to ice rafted detritus to tHe surface ocean. THe 18 relationsHip between deglaciation and productivity is produce 3D model of wall-rock δ O composition at strong in tHe central Gulf of Alaska, and we conclude Mount Isa. THis model identifies zones of alteration that production is the result of increased nutrient coincident witH NNW trending faults and HigH strain zones in tHe folded basement contact. Combining tHis abundance, transport, and upwelling tHat occurs in 18 response to retreating continental ice. witH a δ O gradient model reveals features
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