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Granite gold mineral systems in New . The Sams Creek Peralkaline Granite Hosted Gold Deposit, Northwest Nelson, New Zealand A New Variant on Alkaline Intrusionrelated Gold Deposits. Australasian Institute of Mining and Metallurgy
Peralkaline rocks include those igneous rocks which have a deficiency of aluminium such that sodium and potassium are in excess of that needed for presence of aegerine (sodium pyroxene) and riebeckite (sodium amphibole) are indicative of peralkaline are the peralkaline rhyolites, comendite and pantellerite, with comendite being the more felsic (silicarich) rock.
The deposit, which was discovered by the authors, is composed of domeshaped stocks of rare metal peralkaline granite covering km and represents the late plutonic phases of the Devonian (380390 Ma) multiphase KhaldzanBuregtey peralkaline granite massif.
#0183;#32;At Sams Creek, a peralkaline microgranite dyke intrudes Lower Palaeozoic greenschist facies metasediments. The granitedyke has been extensively silicified and hosts stockwork veins composed of quartz, siderite, and arsenopyrite + pyrite #177; gold
Peralkaline granite Granite is a mediumtocoarsegrained acid igneous rock with essential quartz (gt;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.
The peralkaline composition of the Sams Creek granite and the absence of molybdenite and paucity of chalcopyrite, are major points of difference with goldrich porphyry copper deposits. The presence of a lowsulf idationstate ore mineral assemblage, carbonate alteration and carbonic fluid inclusions at Sams Creek are typical of many of the reduced granitic intrusionrelated type of gold deposit.
#0183;#32;Indeed, the GRIII granite described here is one of very few known occurrences of eudialytebearing peralkaline granite worldwide, after the Ascension Island in the South Atlantic and the Straumsvola complex in Antarctica (Harris et al., 1982, Harris and Rickard, 1987).
Highly evolved alkaline/peralkaline igneous rocks host deposits of rare earth elements (REE) including Y as well as Zr, Hf, Nb, Ta, U and Th.
Gold mineralisation in a syntectonic granite dike Sams . peralkaline granite dike Takaka New Zealandquot;). 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 . Get Price
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Peralkaline Granite With Gold Felona Heavy Machinery. At Sams Creek a peralkaline granite porphyry dyke hosts goldbearing sulfidequartzsiderite veins The granite dyke intrudes OrdovicianSilurian 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
Gold is associated with an arsenopyritepyritequartzsiderite vein stockwork in a peralkaline granite porphyry dyke, which intrudes 500 Ma metasedimentary rocks The granite dyke, which is about 320 Ma, has a thickness of 30 to 60 m, and extends discontinuously for 7 km
The peralkaline granite porphyry, which hosts the goldsulfide mineralisation, intrudes OrdovicianSilurian metapelite, metasandstone and quartzite of the Wangapeka Formation and Hailes Quartzite (Grindley, 1980; Rattenbury, Cooper and Johnston, 1998). The tabular morphology of the granite porphyry body, with a thickness of
PERALKALINE GRANITE IN THE WESTERN PART OF THE ARABIAN SHIELD ABDULAZIZ and is about 150 km of AlMadin and 40 km of the ancient gold . Get Price; peralkaline granite with goldcrusherasia. peralkaline granite with gold. crusher for wast granite. Highly peralkaline forms of Granite which are silica undersaturated may have a feldspathoid
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