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Hf isotopes in zircon reveal contrasting sources and crystallization histories for alkaline to peralkaline granites of Temora, ... R.J. Wormald Malvern Gold, ... gins for a peralkaline granite and ...
Jan 19, 2006· Abstract. At Sams Creek, a gold-bearing, peralkaline granite porphyry dyke, which has a 7 km strike length and is up to 60 m in thickness, intrudes camptonite lamprophyre dykes and lower greenschist facies metapelites and quartzites of the Late Ordovician Wangapeka formation.
Although the Windy Fork pluton contains riebeckite granite, biotite granite, and pyroxene syenite phases; its average chemical composition is that of peralkaline granite. The Windy Fork pluton is radioactive and scintillometer readings taken along traverses across the intrusion range from 650-to-800 cps, about 3 times the average background for ...
At Sams Creek a peralkaline granite porphyry dyke hosts gold-bearing sulfide-quartz-siderite veins. The granite dyke intrudes Ordovician-Silurian metapelite and quartzite, and has thin lamprophyre dykes along its contacts. The mineralised veins and the granite and lamprophyre dykes have been deformed during several phases of folding, the youngest of which is Early Cretaceous. The granite has...
granite [~Aegirine, k r arfvedsonlte granite 2Km l Tor181tte 1Gabbro Fig. 2 Geological sketch map ofthe Temora region, showingsample localities of the Narraburra Granite, the location of other granites and the Springdale Rift and Boginderra Ridge. THE NARRABURRA GRANITE The peralkaline Narraburra Granite crops out over an area of23 km2 at the ...
Assessment method for epithermal gold deposits in northeast Washington State using weights-of-evidence GIS modelling, USGS Open-File Report: 01-501. Braithwaite, R. L. and Faure, K. 2004. The Sams Creek Peralkaline Granite Hosted Gold Deposit, Northwest Nelson, New Zealand - A New Variant on Alkaline Intrusion-related Gold Deposits.
peralkaline granite, and the tin-tungsten-enriched granites are related to medium-sized plutons of biotite or biotite- muscovite granite. Existing geochemical and geologic data for many parts of the Arabian Shield were compiled as a basis for evaluating the resource potential of the granites of the Shield.
Harris NBW, Marriner GF (1980) Geochemistry and petrogenesis of a peralkaline granite complex from the Midian Mountains, Saudi Arabia. Lithos 13:325–337 CrossRef Google Scholar. Hermes OD, Zartmar RE (1985) Late Proterozoic and Devonian plutonic terrane within the Avalon zone of Rhode Island.
Averill, S.A. 2013. Discovery and delineation of the Rainy River gold deposit using glacially dispersed gold grains sampled by deep overburden drilling. In New frontiers for exploration in glaciated terrain. ... Structural and textural evolution of the Strange Lake peralkaline rare-element (NYF) granite pegmatite, Quebec–Labrador.
NORTHWEST-Ririwai Younger Granite ring Complex Major known prospect appears to lie in the Ririwai Younger Granites hosting reportedly the largest deposit of uraniferous pyroclore, an ore of niobium with small amounts of U & Th i. Peralumunous Granite ii Peralkaline (Pyrochlore) NORTHEAST-
Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar.The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. Phonolite is the fine-grained extrusive equivalent.
In the Precambrian Arabian Shield, granitoid plutonic rocks are widespread and range in age from 800 to 550 Ma old; but the mineral-resource potential associated with these plutonic rocks is restricted mainly to the younger, postorogenic granites. Two granite types of current economic interest are zirconium- niobium-enriched per alkaline granites and tin-tungsten-enriched peraluminous granites.
The A-type character of the most felsic granite (WB121) is only apparent through its field association with the other rocks of the Yewrangara pluton. This granite has chemical features that overlap with fractionated I-type granites and its calculated temperature is likewise in the range of I-type granites.
peralkaline granite dike, Takaka, New Zealand"). Lamprophyre dikes ... Sulphides and gold locally replace granite in these bleached zones, and quartz veinlets with sulphides and gold fill the fractures. These types of alteration are typical of rocks ... Granite in these areas is .
The Sams Creek peralkaline granite hosted gold deposit, Northwest Nelson, New Zealand – A New Variant on Alkaline Intrusion-Related Gold Deposits. PACRIM 2004. Golder Associates, 2012. Sams Creek gold deposit. Resource estimate update technical report. Internal Sams Creek Gold .
U.S. GEOLOGICAL SURVEY Preliminary Geologic Map of the South Boston 30 X 60 Minute Quadrangle, ia and North Carolina by J. Wright Horton, Jr.1, John D. Peper1, John D. Marr, Jr.2, William C. Burton1, and Paul E. Sacks1 Open File Report 93-244 Prepared in cooperation with the ia Division of Mineral Resources
Aug 01, 2014· Exploration and mining highlights in Nova Scotia When it comes to mineral resources, Nova Scotia offers tremendous opportunity. ... Gold. Nova Scotia hosts more than 60 historical gold districts. ... Th-rich, peralkaline granite intrusions, and in an overlying suite of felsic and mafic volcanic rocks, was first discovered in northern Nova ...
Peralkaline rocks include those igneous rocks which have a deficiency of aluminium such that sodium and potassium are in excess of that needed for feldspar.The presence of aegerine (sodium pyroxene) and riebeckite (sodium amphibole) are indicative of peralkaline conditions. An example is the peralkaline granite that forms the islet of Rockall in the North Atlantic Ocean.
Peralkaline Granite Granite is a medium-tocoarse-grained acid igneous rock with essential quartz (>20%) and feldspar, where alkali feldspar constitutes between 100 and 35% of the feldspars, and minor mafic minerals. Hornblende and biotite are the commonest mafic minerals, however, muscovite is also frequently encountered.
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At Sams Creek, a gold-bearing, peralkaline granite porphyry dyke, which has a 7km strike length and is up to 60m in thickness, intrudes camptonite lamprophyre dykes and lower greenschist facies ...
The Keivy peralkaline granite complex consists of 2650-2660 Ma peralkaline granites, 2670 Ma syenogranites, and 2680 Ma alkaline syenites. The granites form sheet-like bodies with thicknesses of a few hundred meters, but have vast exposed areas (100-1200 km 2). They are metamorphosed to amphibolite facies and are bounded by gabbro-anorthosite.
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Genetically related to the Jurassic, Bokan Mountain peralkaline granite. Alteration of deposit: This prospect and the other uranium, thorium, and REE deposits associated with the Bokan Mountain peralkaline granite are marked by albitization, chloritization, and argillization.
