Menu
The alteration and gold mineralization occurs in deformed greenschist-facies volcanic rocks of the 590 to 565 Ma Marystown Group. Spatial and genetic relationships exist between mineralization and the eastern margin of the Swift Current Granite and that of related intrusions along strike, particularly in the eastern alteration belt.
Get price
Placer concentrations averaging 7.5% titanium, 2.9% zirconium, 0.21% lanthanum, 0.28% cerium, and 460 ppm niobium occur throughout large areas of the placer deposit. Based on systematic bulk sampling, estimates that the Alaska Range REE placer deposit contains 13.5 million cubic meters of cerium-enriched, REE heavy minerals.
Get price
Syenite is intrusive igneous rock that basically composed of an alkali feldspar and a ferromagnesian mineral. A unique group of alkali syenites is characterized by the presence of a feldspathoid mineral inclusive of nepheline, leucite, cancrinite, or sodalite (see nepheline syenite). Chemically, syenites comprise a slight amount of silica ...
Get price
the cooling and crystallisation of these peralkaline granites may also result in the formation of pegmatites which are valued for the suite of rare elements (e.g. in ta, nb, li, and be) that tend to be concentrated in the residual magmas. ?erny (1993) classified rare element pegmatites into two groups, lct (li-, cs- and ta-rich) and, nyf (nb-, y- .
Get price
REE and HFSE mineralization in peralkaline granites of the Ambohimirahavavy alkaline complex, Ampasindava peninsula, Madagascar G Estrade, S Salvi, D Béziat, S Rakotovao, R Rakotondrazafy Journal of African Earth Sciences 94, 141-155, 2014
Get price
gold grainstone granite granitoid granodiorite granulite grapestone gravel greensand greenschist greywacke grit guano harzburgite hawaiite hornblende gabbro hornblendite hornfels ... peralkaline rhyolite peridotite peridotite phonolite phosporite phyllite picrite polzenite porphyry psammite pyroclastics pyroxenite quartz diorite quartz syenite ...
Get price
Jun 24, 2022These include iron oxide copper-gold-related REE mineralization at Olympic Dam, Australia (6.6 Mt TREO; Oreskes and Einaudi, ... (silicate roof zone type, peralkaline granite type). Alkaline-silicate intrusions containing mineralization are typically circular to oval in plan view ...
Get price
Figure 3. Photo 3a is of a small eudialyte-rich peralkaline dyke or sill intruded into host limestone at the Veladora North area. Photo 3b is of a larger 2 m peralkaline dyke or sill that also contains significant eudialyte. Photo 3c is looking west from the JEMI area. The darker coloured rocks cropping out is a large (20 m) peralkaline dyke.
Get price
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. Gabbro is a dark, medium- to coarse-grained intrusive igneous rock composed of calcium plagioclase, pyroxene, and minor olivine, but no quartz. Etymology:
Get price
Lithostatic pressure estimates suggest that the main granites were emplaced under pressures of ~93-230 MPa, with close-to-liquidus temperatures varying from ~830°C for syenogranites to ~900°C for the peralkaline granites.
Get price
magmatic siderite, a unique occurrence in peralkaline, igneous rocks. ... granites are suitable sources for the Iron oxide-copper-gold (IOCG)-type mineralization. Their work demonstrates that zircon ... The term "A-type granite" was first defined by Loiselle and Wones (1979), who identified a previously unrecognized group of ...
Get price
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 ...
Get price
It is just 45 km northwest of the Sam's Creek gold deposit where similar style granite dykes host over 1M ounces of gold, and airborne geophysics have recently detected a buried granite intrusion that is potentially the source of the gold.
Get price
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.
Get priceAbstract The middle-Proterozoic peralkaline pluton at Strange Lake, Quebec/Labrador, comprises hypersolvus to subsolvus phases which are unusually enriched in Zr, Y, REEs, Nb, Be, and F, as exotic alkali and alkaline-earth silicate minerals. The highest concentrations of these elements are in subsolvus granite, which underwent intense low temperature (≤200°C) hydrothermal alteration ...
Get price
belts. The Pan African Mineralisation belts include the Gold schist belts, the Chromite belt and the Sn-Ta Pegmatite belt all in the Western Province of the Nigerian Basement Complex. The Mesozoic-Cenozoic belts are the Younger Granite Sn-Nb Belt and the Benue Trough Pb-Zn in the Eastern province of the Nigeria Basement Complex.
Get price
(Plutonic Rock > Granitoid > Granite > Peralkaline Granite) A granite with aluminum oxide less than sodium oxide + potassium oxide; typical accessories include: soda pyroxene and soda amphibole[ 99 (Plutonic Rock > Granitoid > Granodiorite) A plutonic rock defined in the QAPF diagram as having Q between 20 and 60 and P/(A+P) between 65 and 90 100
Get price
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.
Get price
significance of plutonic rocks including undated peralkaline granite (North View pluton) and Mesozoic rhyolite porphyry dikes. Mineral resources include the Hamme tungsten district (Parker, 1963; Gair, 1977), copper and gold deposits of the Virgilina district (Laney, 1917; Carpenter, 1976; Johnson and others, 1989), and granite presently ...
Get price
Name: Peralkaline Granite Role: Host Age Type: Associated Rock Unit Age in Years: 181.000000+-Dating Method: K-Ar Age Young: Middle Jurassic. Name: Peralkaline Granite ... The Top Ten Gold Producing States. These ten states contributed the most to the gold production that built the West from 1848 through the 1930s.
Get price
The conterminous United States hosts numerous volumetrically significant and geographically dispersed granitoid intrusions that range in age from 1.50 to 1.32 billion years before present (Ga). Although previously referred to as A-type granites, most are better described as ferroan granites. These granitoid intrusions are distributed in the northern and central Rocky Mountains, the Southwest ...
Get price
The worldwide association of a variety of types of gold deposits with alkaline igneous rocks (Mutschler and Moon- ey, 1993) suggests a genetic relationship. Various possibil- ities have been suggested to explain the relationship: 1.
Get price
peralkaline granite. In situ U-Pb zircon laser ablation ion-coupled plasma mass spectrometry (LA-ICP-MS) was used to date the Compton Intrusives stocks (1895r5 Ma) and to provide the first reliable age estimate for the NLSS (2187r8 Ma). These new dates help define relationships between phases in the eastern lobe, and resolve
Get price
Publication date January 12, 2020 Publisher 'University of Otago Library' Abstract 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.
Get priceIn this diagram (Fig. 5) peralkaline granites falls varies 5kb to more than 10kb pressure and peraluminous granites lies vary < 2kb to 4kb pressure. It is suggested that the peralkaline granites are emplaced at greater depth (16 - 35 km and 480℃ - 840℃) and more fluorine content.
Get price
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...
Get price
Geochemical Exploration for Gold and Associated Elements in the Granite Rocks at Wadi Al Marsad, Southwest Jordan Ibrahim Ahmad Ali BanyYaseen Institute of Earth and Environmental Sciences, Al-al-Bayt University, Al-Mafraq, Jordan ... (568 Ma) and Aheimir Alkaline peralkaline rhyolite (553-458 Ma) suite, but below the nonconformity
Get price
The Topsails igneous complex of western Newfoundland is a large (> 6000 km2) intrusive complex of two contrasting geochemical suites and at least four distinct granitoid facies: (i) a fine-to mediu...
Get price
Hf isotopes in zircon reveal contrasting sources and crystallization histories for alkaline to peralkaline granites of Temora, southeastern Australia. A. Kemp, R. Wormald, M ... M. Gold, Leamington ... A geochronologic study of several intrusive bodies of alkalic granite from eastern Massachusetts yields the following radiometric ages (in ...
Get price
peralkaline granite zr, y, nb, ree, be zr, y, lree y, nb, hree nb, be, zr, y, ta, hf, ree, be level of distal ree pegmatites level of marginal ree pegmatites level of pegmatitic ree granite pegmatite-hosted mineralization 1 2 3 3 3 2 2 2 1 1 peralkaline 4 volcanic rocks tuesday, october 25, 2011.
Get price
The Strange Lake intrusion is a peralkaline granite within the Paleoproterozoic Churchill Structural Province in the northeastern part of the Canadian Shield. The granite, dated at 1240 ± 2 Ma ( Miller 1990 ), intrudes along the contact between Late Archean to Early Proterozoic metasedimentary and metagabbroic rocks to the north and Middle ...
Get price
Made by a Geologist for Geologists. GO TO GOOGLE PLAY PAGE HIGHLIGHTS: 11 most common ore minerals in thin section which cover native elements, sulfides and sulfosalts class (+gangue minerals) (gold, pyrite, chalcopyrite, sphalerite, galena, pyrrhotite, tetrahedrite-tennantite, bournonite-seligmannite, hessite, quartz and rhodochrosite);
Get priceand Associated Mineralization of A-Type Granite Suite of ... of Rock Mechanics, Kolar Gold Fields-563117, India 2Department of Geology, Kurukshetra University, Kurukshetra-136 119, India. Abstract. Neoproterzoic, anorogenic, A -type granites of Dhiran area of Malani Igneous Suites is made up wholly of peralkaline-peraluminous alkali feldspar ...
Get pricePeralkaline silicic extrusive rocks play important roles in many aspects of volcanology, petrology, geochemistry, economic geology and volcanic hazards. (1) They can form large volumes of eruptive material, resulting in significant additions to crustal growth.
Get price
Characteristics of major mineral systems. 1. Porphyry -epithermal (porphyry Cu-Au-Mo, low sulfidation epithermal, high sulfidation epithermal, skarn) 2. Granite -related (intrusion-related gold, intrusion-related Sn-W, porphyry Mo, pegmatitie rare metal, Rossing-type U?) 3.
Get priceWe sought to fully characterize the Dotson Zone heavy-rare earth element (HREE) enriched deposit at Bokan Mountain, Alaska, and place the igneous-hydrothermal evolution of the deposit into the context of the petrogenetic evolution of the Bokan Mountain peralkaline granite and other associated uranium-thorium-rare earth element (U-Th-REE) prospects.
Get price
Alkaline (A-type and highly fractionated felsic I-type) granites that may have formed in post-collisional plate tectonic environments are present in the Alaskan Cordillera, the New England and Lachlan Fold Belts of Australia, and the Arabian-Nubian Shield. Their emplacement is associated with diffuse extension and/or strike-slip shear movements that follow the proposed collisional events by ...
Get price
A black flinty jasper or chert once used for estimating the purity of gold alloys. Not to be confused with bassanite, the mineral, or basanite, the basaltic rock. ... A variety of peralkaline rhyolite of TAS field R in which Al2O3 > 1.33 x total iron as FeO + 4.4. ... (alkali-feldspar) and plagioclase), with subequal amounts of plagioclase and ...
Get price
Many REE deposits occur in peralkaline igneous rocks and resources can be large, but most such deposits are relatively low grade, and only a single deposit in Russia has been mined. Peralkaline REE deposits are typically enriched in yttrium, HREE, and zirconium. Future development of such deposits is probably dependent on the market for zirconium.
Get price
The gold is associated with arsenopyrite-pyrite-quartz-siderite mineralisation in a peralkaline granite porphyry dyke, which intrudes lower Palaeozoic metasedimentary rocks. The first published record of the dyke noted that it was a recrystallised riebeckite microgranite (Shelley, 1984).
Get priceCopyright ©2000- CCM MINERALS CO.,LTD.
