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granite gold peralkaline

A-type granites: characteristics, petrogenesis and their

2011-7-14  A-type granites: characteristics, petrogenesis and their Subaluminous to peralkaline, sometimes peraluminous 3. For rocks of intermediate silica content, A-type granitoids generally have • Six peralkaline granite massifs, confined to the margins of the Keivy terrane

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2.3 Granite-related mineral system Geoscience

2019-10-1  In most of the hydrothermal deposits that form in the granite-related mineral system, critical commodities such as Sn, W and Mo are the primary product. The only exceptions are intrusion-related gold deposits, where, by and large, Au is the only recovered commodity.

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The Sams Creek Peralkaline Granite Hosted Gold

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.

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Syenite - Wikipedia

  

2019-10-13  Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in relatively small concentrations (< 5%).Some syenites contain larger proportions of mafic components and smaller amounts of felsic material than most granites; those are classed as being of intermediate composition.

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A-type granites: geochemical characteristics

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Geochemical Classification for Granitic Rocks Journal

IntroductionIUGS Classification of GranitoidsPrevious Schemes For The Classification of GranitoidsA New Classification Scheme For Granitic RocksProposed Classification SchemeExamples of Granitoid TypesDiscussionConclusionsAlthough granitoids are the most abundant rock types in the continental crust, no single classification scheme has achieved widespread use. Part of the problem in granite classification is that the same mineral assemblage, quartz and feldspars with a variety of ferromagnesian minerals, can be achieved by a number of processes. Granitoids can form from differentiation of any hypersthene-normative melt and from partial melting of many rock types. Furthermore, granitic melts may be derived solel

Peralkaline granites near Temora, southern New South

2018-6-2  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

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Hf isotopes in zircon reveal contrasting sources and

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

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Mineralogical and stable isotope studies of gold

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.

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Gold mineralisation in the polymetallic Sams Creek

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Gold mineralisation in the polymetallic Sams Creek

At Sams Creek, a peralkaline microgranite dyke intrudes Lower Palaeozoic greenschist facies metasediments. The granitedyke has been extensively silicified and hosts stock veins composed of quartz, siderite, and arsenopyrite + pyrite ± gold ± galena ± sphalerite ± chalcopyrite ± pyrrhotite.

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Peralkaline granites near Temora, southern New South

2018-6-2  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

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黑云二长花岗岩 翻译结果--cnki翻译助手

The results are given below. The potash feldspars in quartz monzonitic granite and biotite monzonitic granite are all microcline with t 1(o)=0.57 and t 1(o) =0.53 respectively; 结果表明,石英二长岩、黑云二长花岗岩中钾长石均为高微斜长石,t1(o)分别为0

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The Ascertainment of Late-Yanshanian A-type Granite in

The study and discussion of petrology and geochemistry have revealed that there exists two kinds of A_type granites in Tongbai_Dabie orogenic belt: peralkaline and aluminous granites. The peralkaline A_type granites include alkaline feldspar granite and quartz

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A Preliminary Experimental Study on the Solubility of Gold

is higher than that in the coexisting aqueous fluid.Solubility of gold is affected by composition of the melt,and gold solubility in Na-rich peralkaline silicate melts is obviously higher and increases with increasing Na2O/K2O mole ratio.Fluorine has no

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Hf isotopes in zircon reveal contrasting sources and

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

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A-type granites: geochemical characteristics

Harris NBW, Marriner GF (1980) Geochemistry and petrogenesis of a peralkaline granite complex from the Midian Mountains, Saudi Arabia. Lithos 13:325337 CrossRef Google Scholar. Hermes OD, Zartmar RE (1985) Late Proterozoic and Devonian plutonic terrane within the Avalon zone of Rhode Island.

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Petrogenesis and Tectonic Implications of Peralkaline

2018-12-21  In this study, we present systematic petrological, geochemical, LA-ICP-MS zircon U-Pb ages and Nd isotopic data for the A-type granites and syenites from Suizhou-Zaoyang region. The results show that the peralkaline A-type granites and syenites were episodically emplaced in Suizhou-Zaoyang region between 450±3 and 441±7 Ma which corresponds to Late Ordovician and Early Silurian periods

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Gold mineralisation in a syntectonic granite dike, Sams

2018-6-14  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

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Nepheline syenite - Wikipedia

2019-10-16  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.

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(PDF) Granite gold mineral systems in New Zealand

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.

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A-type granites

2011-8-23  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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This article was downloaded by: [JAMES COOK

The granite is peralkaline (AI203/Na20 + K20 =0.95-0.96),containsaegirine andarfvedsonite,and is only thethirdoccurrence of peralkalinegraniterecorded in the Lachlan Fold Belt ofsoutheasternAustralia.

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Mineralogical and stable isotope studies of gold

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.

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Petrogenesis of Derraman Peralkaline granite (Oulad

The North Derraman granite is intruding the ca. 3.12 Ga Bulautad gneisses while the Derraman High body is emplaced The agpaitic index ranges from 0.94 to 1.12 and about 40% of the analyzed samples are peralkaline. In the high-silica granite classification of The mounts were slightly repolished and recoated with a 12 nm thick gold layer.

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文章摘要信息

2019-2-1  摘要: Quartz porphyry in Yuejinshan Fe-polymetallic deposit is one of the rock masses, which formed the granite belt relating to the late Yanshanian skarn-type Fe-polymetallic deposits in the eastern Heilongjiang, and is also closely related to the Quartz

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The Sams Creek Porphyry Gold Deposit, Northwest

2019-9-19  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 Ltd Report, June 2012.

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Mineralogical and stable isotope studies of

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

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Characterization and Origin of Aluminous A-type

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.

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胶东金矿成矿构造背景探讨

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