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Khan Bogd Peralkaline Granite, Khanbogd District, Ömnögovi Province, Mongolia : The largest known intrusion of peralkaline granites. Extends over 1500km². It is emplaced into Paleozoic sedimentary and volcanic rocks and consists of 2 roughly circular overlapping intrusions, of ...
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.
Abstract Riebeckite granite at Sams Creek, northwest Nelson, was intruded as an 8 km long dike into slate and quartzite metasediments (Wangapeka Formation) before or during deformation under greenschist facies conditions. Lamprophyre intrusion accompanied granite emplacement. Deformation after intrusion resulted in folding of metasediments on a northerly trend, and buckling of the east ...
ABSTRACT: 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 ...
At Sams Creek a gold-bearing, peralkaline granite pophyry dike intrudes Ordovician-Silurian metapelite and quartzite. These metasedimentary rocks have undergone three phases of folding: a first phase of recumbent folds (F1), a second phase (F2) of northerly-trending inclined folds with a prominent crenulation cleavage, and a third phase (F3) of steeply plunging folds.
REE in New Mexico: peralkaline igneous rocks, granite, and pegmatites (Fig. 1). Many peralkaline igneous rocks, typically of syenite or granite composition, have higher concentrations of REE and Zr then other types of igneous rocks. Alkaline rocks are defined as rocks with Na 2O+K 2O>0.3718(SiO 2)-14.5 (MacDonald and Katsura, 1964) or rocks ...
The Sams Creek peralkaline granite hosted gold deposit, northwest. Nelson. New Zealand: A new variant on alkaline intrusion-related gold deposits. Proceedings of the.
Rare metal indicator minerals in bedrock and till at the Strange Lake peralkaline complex, Quebec and Labrador, Canada M.B. McClenaghan, a R.C. Paulen, a I.M. Kjarsgaard b a Geological Survey of Canada, 601 Booth Street, Ottawa, ON K1A 0E8, Canada.
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.
Hydrothermal Ore Deposits, Rare Metals, Fluid Inclusions, Peralkaline Rocks, Geochemistry. My research is devoted mainly to understanding the formation of hydrothermal ore deposits. In particular, I have investigated rare-metal bearing alkaline rocks, orogenic gold deposits, pegmatites, porphyry deposits, and gems.
Brathwaite, 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. PACRIM 2004. Golder Associates, 2012. Sams Creek gold deposit. Resource estimate update technical report. Internal Sams Creek Gold Ltd Report, June 2012. Jongens ...
Jan 19, 2006· 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. The lamprophyre dykes occur as thin (< 3 m) slivers along the contacts of the granite dyke. δ18Omagma .
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.
Granite, Peralkaline Syenite Carbonatite Pegmatite 7. PHOSPHORITE 8. COLLAPSE BRECCIA PIPE 9. VOLCANIC . 39 10. SURFICIAL Duricrust Peat and Bog Karst Cavern Surficial Pedogenic and structure fill ... as a by-product of gold. Uranium deposits Blind River, Elliot Lake area of Canada. 44 D.Vein deposits (i) Granite related deposits fractures with ...
A peralkaline granite porphyry dyke which hosts gold-bearing sulphide-quartz-siderite veins at Sams Creek has a thickness of 30 to 40 m and lateral extent of at least 7 km. The granite dyke, which has thin lamprophyre dykes along its contacts, intrudes Ordovician-Silurian metapelite and quartzite.
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, north-west Nelson. The granite is riebeckite and acmite bearing, with antiperthitic alkali feldspars; it has A-type chemistry, implying an origin by partial melting at a temperature ...
THE PERALKALINE TIN-MINERALIZED MADEIRA CRYOLITE ALBITE-RICH GRANITE OF PITINGA, AMAZONIAN CRATON, BRAZIL: PETROGRAPHY, .
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.
The albite granite is composed by two facies. The dominant is a gray, peralkaline core facies (CAbG), which is composed essentially by albite, quartz and K-feldspar, accompanied by cryolite, zircon, polylithionite, riebeckite, Li-Fe mica, cassiterite, pyrochlore and magnetite. . Ma Granito Serra da Providência 1606 ±24 Ma ti 1573 ±15 Ma li .
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 .
In the JTP, gold occurs mainly in high-grade small deposits hosted in quartz veins and often related to shear zones, or disseminated in widespread hydrothermal zones. In the Matupá Granite, gold seems to be related to a porphyry system (Botelho and Moura 1998). The mineralization is concentrated in the most intensely hydrothermalized zones.
Initial results of investigations reveal that peralkaline fine-grained granite and microgranite dykes occurring essentially in the form of dykes of various dimensions associated with Siwana Ring ...
Unlike the REE-rich Strange Lake peralkaline granite, neither the Longs Peak-St. Vrain granite, aplite dikes, nor the F-, P 2 O 5 - and REE-rich segregations has undergone subsequent hydrothermal alteration. Samples from this locality, therefore, provide a unique opportunity to evaluate the distribution of elements between immiscible silica–flu-
Deposits that form part of the granite-related mineral system include granite-related Sn-W-F (including a variety of skarn deposits), pegmatite-hosted Ta-Nb-Li-Be, porphyry Mo and intrusion-related gold deposits. Aspects of the granite-related mineral system are presented by ?erný et al. (2005), Ludington and Plumlee (2009) and Hart (2005).
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