TAG 166 - Geological Society of Australia

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Newsfrom the DivisionsNSWAll students were presented their certificates by Ian Graham, Chair of the NSW Division and GSAVice-President. Images courtesy Mira van der Ley and Ian Graham.TOP LEFT: Emma Flannery receiving her certificate.TOP CENTRE: Ryan Manton receiving his certificate.TOP RIGHT: Timothy Chapman receiving his certificate.ABOVE LEFT: Lydia Belford receiving her certificate.ABOVE RIGHT: Amanda Hanani receiving her certificate.Division HonoursThe NSW Division held its annual honoursnight on 15 November 2012, where thetop-performing honours students gave talks.Approximately 40 members enjoyedfascinating talks by Ryan Manton (University ofWollongong), Emma Flannery (MacquarieUniversity), Lydia Belford (University ofNewcastle), Timothy Chapman (University ofSydney) and Amanda Hanani (University of NewSouth Wales). Their talks covered caves,calderas, hydrocarbons, hypersthene, and morehydrocarbons. Emma Flannery was awarded besttalk of the night with her presentation onhydrocarbon signatures in core slices.It was an extremely enjoyable night, withlots of tough questions for the students frommembers of the audience, generating livelydiscussion.Newsfrom the Specialist GroupsSGGMP — Rocks, Reef and RainforestMission Beach, Qld, 14–19 July 2013Biennial conference of the Specialist Group in Geochemistry,Mineralogy and Petrology (SGGMP)Following the format of the successful Kangaroo Island (2009) andMurramarang (2011) SGGMP conferences, this Gordon-style conferenceto be held in tropical North Queensland will combine oral and posterpresentations, field trips and a packed social program. The conference willaddress three main themes:1. Revealing the concealed Earth using novel techniques2. Cooking the crust — high-grade metamorphism and melting3. Evolution of the Australian Plate — ancient cratons and modern.Field trips will include examination of the Paleozoic Barnard MetamorphicComplex at Mission Beach and on Dunk Island, and the Late Mioceneto Holocene Atherton Basalt Province. Reef snorkelling and rainforestexcursions are inclusive.The conference will be limited to approximately 60 delegates, soregister your interest early!For more information, visit http://sggmp2013.webs.com/.SGTSG — Biennial meetingThredbo, NSW, 2–8 February 2014Meeting of the Special Group in Tectonics and Structural Geology(SGTSG) (held every second year).There will be a welcome BBQ and cricket match on Sunday2 February. The conference dinner will take place on the evening ofFriday 7 February. Professor Mark Jessell (France) will deliver the midweekafter-dinner keynote address.For more information, contact Gordon Lister atgordon.lister@anu.edu.au.TAG March 2013| 13
NEWSIn the news this issuen NRG Rock of the Monthn National Rock Garden updaten International Geological Correlationn Programme (IGCP)n University honours geologistn Case studies soughtn Ediacaran Golden Spike localityn China, Australia and geoparksn Fossil problematica from Moretonn National ParkNational Rock Garden —Boogardie orbicular graniteGSA Rock of the Month — March 2013The Boogardie orbicular granite deposit is located 35 km west of MountMagnet in Western Australia. This unusual granitic rock, located onBoogardie Station, is one of a few orbicular granite localities knownworldwide. The orbicular granite is hosted by a pink, medium-grained,late Archean granitic rock, comprising myrmekitic biotite granodioritethat becomes tonalitic in places. Information from diamond drillholesindicates that orbicular granite bodies may have formed as saucershaped,sill-like structures within the host granodiorite–tonalite. Overthe area of the Boogardie quarry, the orbicular granite appears as anoval-shaped body, about 40 m wide and at least 55 m long. Maximumthickness at the centre is 11.4 m, tapering off in all directions torelatively small thicknesses at the outer rims.Within the sill-like structures, abundant granitic orbicules arecontained in a leucogranitic body of variable tonalitic composition. Theblack and white, concentrically banded orbicules are of spectacularappearance. Orbicules are mostly ellipsoidal but also include lessernumbers of near-spherical, irregular and broken shapes. Orbicules havean average length of about 140 mm along their longest axis by 75 mmin width. Orbicule spacing varies from orbicular masses in tangentialcontact with one another to a maximum separation of about 100 mm,although overall orbicule distribution appears roughly uniform throughoutthe rock, as shown in the photograph of the matrix cut by apegmatite vein below.Individual orbicules are generally separated from the enclosinggranitic matrix by a mid- to dark grey outer shell up to 10 mm thick, whichis made of mainly fine- to medium-grained hornblende, biotite and plagioclasefeldspar, with minor opaque oxide and titanite. Inside this protectiveshell, orbicules have a hornblende-diorite composition, largelycomposed of plagioclase feldspar and hornblende with lesser amounts ofbiotite, opaque oxide and titanite. Orbicules usually contain five to seven(or even more) major, well-defined concentric zones of variable width,structural complexity and mineralogy. Some major zones may be up to15 mm wide and commonly contain large, irregular, elongate, radiallyaligned hornblende grains interspersed with white plagioclase. Thesehornblende grains may extend across the entire width of the zone and arecommonly tapered internally to a point, as shown by the spectacular imageof the individual orbicule opposite (Fetherston, 2010).Orbicules enclosed in a granodiorite–tonalite matrix cut by a late-phase pegmatite vein. Image courtesy Mike Fetherston.14 |TAG March 2013
Page 3 and 4: From the PresidentWelcome back from
Page 5 and 6: Society UpdateGovernance changesCom
Page 9 and 10: Society UpdateFrom the AJES Hon Edi
Page 11 and 12: Society UpdateEducation&OutreachIn
Page 13: A conference in 2014 is envisaged a
Page 17 and 18: It is proposed that an important el
Page 19 and 20: IGCP projects with Australian leade
Page 21 and 22: Ediacaran Golden Spike localityVisi
Page 23 and 24: Feature 1Feature 1Snowy Mountains H
Page 25: Tumut 2 tailwater tunnel during con
Page 31 and 32: Fossil hunting organised by Kronosa
Page 33 and 34: Fortunately for Paul Stumkat, he is
Page 35 and 36: Year 12 EES students from across WA
Page 37 and 38: Special Report 3Global warming and
Page 39 and 40: As indicated in the table accompany
Page 41 and 42: Ian Percival spoke on protecting an
Page 43 and 44: Books for reviewPlease contact the
Page 45 and 46: An introductory paper to the volume
Page 47 and 48: this land, and showing the richness
Page 49 and 50: Geology of QueenslandP Jell (Ed)Dep
Page 51 and 52: O B I T U A R I E SSylvia Whitehead
Page 53: The Australian GeologistBackground

TAG 166 - Geological Society of Australia

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