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peralkaline A chemical classification applied to felsic igneous rocks in which there are more molecules of (Na 2 O + K 2 O) than of Al 2 O 3. Rocks with such a chemistry crystallize alkalirich ferromagnesian minerals such as aegirine, aegirineaugite, barkevikite, and arfvedsonite. See also METALUMINOUS.
Creek gold deposit do not fit neatly into existing classifications of graniterelated goldbearing deposits. 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 low sulfidationstate ore mineral
Northeastern Baltic Shield... The Keivy complex in the NE Baltic shield consists mainly of sheetlike peralkaline granite bodies, granosyenite dykes and some nepheline syenite faulttype According to a study by Bayanova and Zozulya (1999), the emplacement ages for peralkaline granite magmatic vary from 2610 Ma for the White Tundra massif to 2670 Ma for the
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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.
gold deposit are similar to other graniterelated gold deposits but that it appears to be a variant of the alkaline intrusionrelated gold deposit typean AsAu. Chat Online; Geologic units containing granite USGS. Subaluminous granite Peralkaline granite Charnockite. Gold Hill Kannapolis Salisbury Southmont and Yadkin intrusives.
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.
At Sams Creek, a goldbearing, 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
#0183;#32;Keywords: Gold; Isotopes; Magmatic fluids; Peralkaline granite; New Zealand 1. Introduction At Sams Creek, a peralkaline microgranite dyke has intruded the Lower Palaeozoic metasedimentary rocks of the Takaka Terrane (Figs. 1 and 2).
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.
#0183;#32;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.
Abstract. At Sams Creek, a goldbearing, 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.
Peralkaline granite with fayalite (ironrich endmember of olivine group). Norway. From Sandatlas. Rapakivi granite with plagioclase rims around ovoidal phenocrysts of alkali feldspar. Luum#228;ki, Finland. From Sandatlas. Bibliography Cox et al. (1979): The Interpretation of
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.
#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).
A recent paper by Prof. George P. Merrill, Curator of the Department of Geology of the U. S. National Museum, Washington, upon An Occurrence of Free Gold in Granite, describes an interesting instance of the dissemination of this noble metal in the substance of granite of normal composition believed to be from Sonora, Mexico. He found the gold in small scales, rarely exceeding a
Peralkaline granite A granite with aluminum oxide lt; sodium oxide + potassium oxide; typical accessories include: soda pyroxene and soda amphibole This category is also used
Gold mineralization is hosted by a peralkaline granite dyke which outcrops over about eight kilometers in the area of Sams Creek, a tributary of the Takaka River, northwest Nelson. The granite is riebeckite and acmite bearing, with antiperthitic alkali feldspars; it has Atype chemistry, implying an origin by partial melting at a temperature gt; 800#176;C.
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