Updated: 11 October 2005

Magmas to Mineralisation: The Ishihara Symposium on granites and related metallogenesis

Record 2003/14

Edited by P. Blevin, M. Jones and B. Chappell

A one day Workshop and a two day Symposium was held from 22-24th July 2003 at Macquarie University in Sydney to address recent research into granites and their associated ore deposits.

The Symposium - the Ishihara Symposium in honour of Professor Shunso Ishihara of Japan - addressed the themes "Australian Granites through Time" and "Granites and Metallogenesis". Papers presented were focussed on issues related to granites and related ore deposits from the Archaean to the Tertiary.

The Workshop, which preceded the Symposium, provided a forum for people wishing to become more familiar with modern ideas on granite petrogenesis developed by Bruce Chappell and Allan White, and the work on mineralisation related to granites in Eastern Australia by Phil Blevin.

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Title and Summary	Author	Report
Introduction Cover \| Sponsors \| Bibliographic page	Editors: Blevin, P., Jones, M., Chappell, B.	[PDF_260KB]
Metallogeny of granitic rocks - Abstract and Presentation Empirical and theoretical evidence support a strong correlation between the compositional character of granites and ore element associations in related mineralisation (Blevin and Chappell; 1992, 1995).	Blevin, P.L.	[PDF_2.2MB]
Palaeozoic granite metallogenesis of eastern Australia - Abstract and Presentation Granites (s.l.) and related rocks of eastern Australia can be classified according to metallogenic potential using a scheme based on compositional character, degree of compositional evolution, degree of fractionation, and oxidation state.	Blevin, P.L.	[PDF_3.5MB]
Granites of the southern New England orogen - Abstract and Presentation The New England Orogen (NEO) is easternmost and youngest portion of the Australian continent, generated as a consequence of Devonian to Triassic subduction-related activity.	Bryant, C.J., Chappell, B.W., & Blevin, P.L.	[PDF_3.3MB]
Archaean granites - Abstract and Presentation Archaean cratons that formed throughout some 40% of the earth's history (>2500 Ma), now comprise <10% of the continents, but contribute significantly to the world's mineral wealth.	Champion, D.C., & Smithies, R.H.	[PDF_3.8MB]
Granites of north Queensland - Abstract and Presentation North Queensland comprises Palaeoproterozoic to Mesoproterozoic basement (Etheridge, Savannah, Croydon) provinces structurally overlain by successively younger components including Neoproterozoic-Cambrian (Iron Range, Cape River, Barnard), Cambrian-Ordovician (Thalanga) and Ordovician to Carboniferous (Broken River, Hodgkinson) provinces.	Champion, D.C., & Bultitude, R.J.	[PDF_3.1MB]
From Tuttle and Bowen onwards - Abstract and Presentation Publication of the Tuttle & Bowen (1958) memoir resolved the intense debate about whether granites are magmatic or metasomatic in origin, firmly in favour of the magmatic view.	Chappell, B.W.	[PDF_2.2MB]
Causes of variation in granite suites - Abstract and Presentation Granite suites each have characteristic compositional features and show regular transitional internal variations in composition.	Chappell, B.W.	[PDF_2.2MB]
High- and low-temperature granites - Abstract and Presentation I-type granites of the Palaeozoic fold belts of Eastern Australia fall into two groups, formed at high and low magmatic temperatures.	Chappell, B.W.	[PDF_912KB]
Towards a unified model of granite petrogenesis - Abstract and Presentation Modern granite studies date from the observation by Tuttle & Bowen (1958) that the compositions of the most felsic granites correspond closely with those of hydrous melts produced in equilibrium with quartz and feldspars in the laboratory.	Chappell, B.W.	[PDF_1.5MB]
Granites of the Lachlan Fold Belt - Abstract and Presentation The Palaeozoic Lachlan Fold Belt (LFB) occupies the southeastern corner of the Australian continent and it has a total area of close to 300 000 km².	Chappell, B.W.	[PDF_1.8MB]
Australia's first hot dry rock geothermal energy extraction project is up and running in granite beneath the Cooper Basin, NE South Australia - Abstract Australia's deepest onshore well, Habanero 1, is currently being drilled into hot granite in the basement to the late Carboniferous to Permian Cooper Basin in NE South Australia.	Chopra, P., & Wyborn, D.	[PDF_222KB] [HTML]
Some modern concepts on Lachlan granite petrogenesis - Abstract This presentation will show, based on field, geophysical, geochemical and isotopic studies, that Silurian-Devonian plutonism in the eastern Lachlan Fold Belt (LFB) was intimately involved with mafic magmatism.	Collins, W.J.	[PDF_114KB] [HTML]
Epithermal Au-Ag - the Magmatic Connection. Comparisons between East and West Pacific rim - Abstract and Presentation Epithermal Au-Ag deposits are distinguished as high and low sulphidation (HS & LS) on the basis of ore and gangue mineralogy, derived from distinctly different fluid typess, and for the LS deposits there is a further distinction between the group of base metal rich deposits which commonly display a relationship with intrusion source rocks, and the banded adularia-sericite style quartz veins.	Corbett, G.	Complete report-[PDF_8MB] Part 1-[PDF_3.9MB] Part 2-[PDF_4MB]
Granite production in the Delamerian Orogen - Abstract The Delamerian-Ross Orogen is important for several reasons: i) it records the critical transition of SE Gondwana from a passive to subduction margin. ii) it provides a model for the evolution of a tectonic style subsequently perpetuated in the Palaeozoic Lachlan fold belt to the east. iii) It provides a glimpse of the association of thermomagmatic processes with an extension-dominated style of orogenesis that is very different from classical Alpine-Himalayan and Andean models. iv) The geochemistry of its magmas confronts some firmly held views on the use of geochemical discrimination diagrams in their tectonic assignation.	Foden, J.	[PDF_80KB] [HTML]
Controls on Skarn Mineralisation and Alteration at the Cadia Deposits, New South Wales, Australia - Abstract The Cadia skarns in eastern New South Wales, Australia, are associated with the Late Ordovician, shoshonitic Cadia Intrusive Complex (CIC).	Forster, D.B., & Seccombe, P.K.	[PDF_2.7MB]
Tectonic setting of porphyry copper-gold mineralisation in the Macquarie Arc - Abstract Models of porphyry copper-gold ore formation involve magmatic volatile release from a crystallising intrusion. Incompatible elements are partitioned strongly into the aqueous phase, and fluid release probably commences at depths of several kilometres.	Glen, R.A., Crawford, A.J., & Cooke, D.R.	[PDF_115KB] [HTML]
The magmatic-hydrothermal transition: Volatile separation in silicic rocks at Bajo de la Alumbrera porphyry Cu-Au deposit, NW Argentina - Abstract Ore-bearing hydrothermal alteration in porphyry-related deposits largely form from exsolved magmatic fluids derived from crystallising, upper crustal silicic magmas (e.g., Hedenquist & Lowenstern 1994).	Harris, A.C., Kamenetsky, V.S., & White, N.C.	[PDF_3.5MB]
Are Magmas Sources of Most or All Metals in Iron Oxide-Copper-Gold and Related Ore Types? - Abstract and Presentation Magmas are unlikely to be an "ortho-magmatic" source of copper and gold in iron oxide-copper-gold deposits, although data are not sufficient to confirm this inference as yet. Current hypotheses positing ortho-magmatic sources deserve critical examination, because iron oxide-copper-gold deposits display.	Haynes, D.W.	Complete report-[PDF_11.0MB] Part 1-[PDF_4.7MB] Part 2-[PDF_5.4MB] Part 3-[PDF_2.7MB]
Metallogenic mineralization vs the granite series in the Mesozoic-Cenozoic Circum-Pacific plutonic belts - Abstract Major metallic mineralizations occur in the form of sulfides, such as molybdenite, chalcopyrite, bornite, sphalerite, galena, argentite, etc. These S-combined metals are brought by oxidized, magnetite-series granitoids, because of predominance of oxidized species sulfur, which takes out metals from the host granitic magmas the vapor phase, then to the granite cusps and the surrounding wall rocks.	Ishihara, S.	[PDF_955KB] [HTML]
Mesozoic Granites and Associated Mineralization in South Korea - Abstract Tectonically, South Korea can be divided into four provinces based on the distribution of sedimentary basins upon Precambrian basements.	Jwa, Y-.J.	[PDF_112KB] [HTML]
Granites, volatile solubility & tracking the formation of magmatic fluids - Abstract and Presentation Magmatic fluids have an important role in carrying metals from a source region to ultimate deposition and preservation in an ore deposit.	King, P.L., & White, A.J.R.	[PDF_1.3MB]
Gravity and granites - Abstract and Presentation Geological data is almost never reliable enough to quantify the shape of granitic plutons at depth. For this reason, geophysical surveys are conducted to obtain further information of the sub-surface.	Lackie, M.A., Bailey, B.T., & Edmiston, M.A.	[PDF_4.4MB]
The nature of Tombstone plutonic suite rocks at Scheelite Dome, Tintina gold province: evidence for an enriched mantle contribution - Abstract and Presentation Magmatic-hydrothermal systems have long been recognized for their critical role in the generation of many ore deposit types.	Mair, J.L., Hart, C.J.R., Groves, D.I., & Goldfarb, R.J.	[PDF_3.7MB]
Evidence of a granite-related source for the Braidwood-Araluen-Majors Creek goldfields, NSW, Australia - Abstract More than 40 tonnes of gold have been produced from alluvial placer deposits in the Braidwood-Araluen area of southeastern New South Wales (Middleton, 1970). Most of this gold appears to have been derived from the roof zone of the Braidwood Granodiorite.	McQueen, K.G.	[PDF_101KB] [HTML]
Granites of the northern New England orogen - Abstract and Presentation The northern New England Orogen (NNEO) extends from the sedimentary cover of the Clarence-Moreton Basin in the south to the Bowen area, and west to the Bowen Basin.	Murray, C.	[PDF_2.7MB]
Mid-Mesozoic Granites and Mineralisation in Hong Kong - Abstract Hong Kong lies at the southeast margin of the Mesozoic magmatic belt of the Cathaysia block of southeast China. It is in the centre of the Arcuate coastline which is backed by mainly Jurassic-Cretaceous granite and acid volcanic rocks.	Ruxton, B.P.	[PDF_73KB] [HTML]
Melting the crust – where is the heat? - Abstract Granites don't appear to form randomly! Rather, they show a strong spatial and temporal association with tectonic phenomena that are, more often than not, related to plate boundary processes.	Sandiford, M.	[PDF_140KB] [HTML]
Subducted Ridges, Magmas, Differential Uplift, and Gold Deposits: Examples from South and Central America - Abstract and Presentation Magmatic-related Au-Ag deposits of similar age and type in magmatic arcs along convergent margins are not uniformly distributed, but are longitudinally grouped in "gold-rich" regions separated by segments containing few deposits.	Shatwell, D.	[PDF_1.7MB]
High Sr/Y (HiSY) granitoid magmatism in convergent margins; nomenclature and setting - Abstract Cretaceous plutons of the eastern Peninsular Ranges Batholith (PRB) and the Separation Point Suite of New Zealand represent major fluxes of relatively high Na, Sr and low Y, HREE magmas.	Tulloch, A.	[PDF_96KB] [HTML]
Paleozoic plutonism in the New Zealand sector of Gondwana - Abstract Mid-Paleozoic granitic rocks intrude two distinct metasedimentary terranes (western Buller, eastern Takaka) in western New Zealand. Early and late Paleozoic granitoid rocks are volumetrically insignificant.	Tulloch, A.J., Kimbrough, D.L., Faure, K., & Allibone, A.H.	[PDF_89KB] [HTML]
Granite transport and emplacement: a review - Abstract and Presentation There has been considerable discussion about the transport mechanism of felsic magmas through the crust. Diapirism has been discredited as an efficient transport mechanism partly because diapirs rise slowly and are thought to freeze early and close to the magma source, and partly because it has recently been shown that sufficiently wide dykes (2 to 20m wide) are able to rapidly transport felsic magmas through the crust without freezing.	Weinberg, R.	[PDF_2MB]
The geophysical characteristics of granites and shear zones in the Yilgarn Craton, and their implications for gold mineralisation - Abstract and Presentation The Archaean Yilgarn Craton provides two thirds of the Australian gold output of ~300 tonnes per year yet occupies only 10% of the continent.	Whitaker, A.	[PDF_2.1MB]
Suites with particular reference to granites of eastern Australia - Abstract and Presentation Separate granite plutons in southeastern Australia can commonly be grouped into suites on the basis of shared similarities of field, petrographic and compositional data. Granites in different plutons of the same suite share common properties or exhibit a sequence of such features.	White, A.J.R.	[PDF_2.1MB]
Granite melt forming reactions - Abstract and Presentation Partial melting within the crust is widely accepted for the production of at least some, if not most granite magmas. It is considered that partial melting is not a response to increasing temperatures in rocks containing haplogranite components but is a result of melt-forming reactions as temperature and possibly pressure increases (White et al. 2003, and refs therein).	White, A.J.R.	[PDF_1.3MB]
Porphyry copper mineralisation of western USA - Abstract and Presentation Porphyry copper deposits of western USA are very large low grade deposits dominated by disseminated Cu mineralisation but commonly with appreciable Mo and Au. Many deposits began as gold camps.	White, A.J.R.	[PDF_3.3MB]
Measuring the ages of granites: the challenge to get it right - Abstract and Presentation To measure the ages of igneous rocks by isotope geochronology is, in principle, a relatively simple procedure. There is a variety of dating techniques to choose from (e.g. K–Ar, Ar–Ar, Rb–Sr, U–Pb, Sm–Nd) and, with a few exceptions, the technicalities of each method are well understood.	Williams, I.S.	Complete report-[PDF_5MB] Part 1-[PDF_1.9MB] Part 2-[PDF_2.3MB] Part 3-[PDF_900KB]
Petrogenesis of Proterozoic Anorogenic Granitoids from the Mazury Complex (NE Poland) - Abstract The crystalline Proterozoic Mazury Complex is situated in northeastern Poland and forms the westernmost part of the large East European Craton (EEC).	Wiszniewska, J.	[PDF_138KB] [HTML]
Assessing the Metallogenic Potential of Proterozoic Granite Suites from First Principles - Abstract and Presentation Proterozoic Granites in Australia crop out over at least 145 000 km² (Table 1). To assess their metallogenic potential, a systematic study was undertaken of all granites as well as the composition of rocks within five kilometres of the granite boundaries (Budd et al., 2001).	Wyborn, L.	[PDF_3.8MB]