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Electron Microprobe And Bulk Rock And Mineral Compositions From Rare Element Pegmatites And Peraluminous S Type Granitic Rocks From The Fort Hope Pegmatite Field North Central Superior Province Of Ontario
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Book Synopsis Electron Microprobe and Bulk Rock and Mineral Compositions from Rare-element Pegmatites and Peraluminous, S-type Granitic Rocks from the Fort Hope Pegmatite Field, North-central Superior Province of Ontario by : Ontario Geological Survey
Download or read book Electron Microprobe and Bulk Rock and Mineral Compositions from Rare-element Pegmatites and Peraluminous, S-type Granitic Rocks from the Fort Hope Pegmatite Field, North-central Superior Province of Ontario written by Ontario Geological Survey and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electron Microprobe and Bulk Rock and Mineral Compositions from S-type, Peraluminous Granitic Rocks and Rare-element Pegmatites, Georgia Lake Pegmatite Field, Quetico Subprovince, North-Central Superior Province of Ontario by :
Download or read book Electron Microprobe and Bulk Rock and Mineral Compositions from S-type, Peraluminous Granitic Rocks and Rare-element Pegmatites, Georgia Lake Pegmatite Field, Quetico Subprovince, North-Central Superior Province of Ontario written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fertile and Peraluminous Granites and Related Rare-Element Mineralization in Pegmatites, North-Central and Northeastern Superior Province, Ontario by : F. W. Breaks
Download or read book Fertile and Peraluminous Granites and Related Rare-Element Mineralization in Pegmatites, North-Central and Northeastern Superior Province, Ontario written by F. W. Breaks and published by . This book was released on 2006-01-01 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Georgia Lake Rare-Element Pegmatite Field and Related S-Type, Peraluminous Granites, Quetico Subprovince, North-Central Ontario by : F. W. Breaks
Download or read book The Georgia Lake Rare-Element Pegmatite Field and Related S-Type, Peraluminous Granites, Quetico Subprovince, North-Central Ontario written by F. W. Breaks and published by . This book was released on 2008-01-01 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reference Specimen Collection of Rare-Element Pegmatites, Granitic Rocks and Migmatites, Mainly from the Superior Province of Ontario by : F. W. Breaks
Download or read book Reference Specimen Collection of Rare-Element Pegmatites, Granitic Rocks and Migmatites, Mainly from the Superior Province of Ontario written by F. W. Breaks and published by . This book was released on 2008-01-01 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis S-37 Occurrences in the Grover Pegmatite Mine on North Beaver Brook by : G. B. Guillotte
Download or read book S-37 Occurrences in the Grover Pegmatite Mine on North Beaver Brook written by G. B. Guillotte and published by . This book was released on 1944 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pegmatites of the Crystal Mountain District, Larimer County, Colorado by : William Roberts Thurston
Download or read book Pegmatites of the Crystal Mountain District, Larimer County, Colorado written by William Roberts Thurston and published by . This book was released on 1955 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rare-earth Pegmatites of the South Platte District, Colorado by : William B. Simmons
Download or read book Rare-earth Pegmatites of the South Platte District, Colorado written by William B. Simmons and published by . This book was released on 1980 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geology of the Pegmatites and Associated Rocks of Maine :. by : Edson Sunderland Bastin
Download or read book Geology of the Pegmatites and Associated Rocks of Maine :. written by Edson Sunderland Bastin and published by . This book was released on 1911 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Major and Trace Element Chemical Composition of Gahnite from Granitic Pegmatites and a Metamorphosed Massive Sulfide Deposit by : Jason Anthony Yonts
Download or read book Major and Trace Element Chemical Composition of Gahnite from Granitic Pegmatites and a Metamorphosed Massive Sulfide Deposit written by Jason Anthony Yonts and published by . This book was released on 2014 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare-element granitic pegmatites are common hosts to economic deposits of rare metals, including Li, Ta, and rare-earth elements, which are increasing in economic importance due to advancing technology. Gahnite (ZnAl2O4) occurs as an accessory mineral in metamorphosed massive sulfide deposits (MMSDs) and some rare-element granitic pegmatites, including those with rare-metal mineralization, but detailed chemical studies of gahnite in these rocks are very scarce. In this study, gahnite from twenty-four granitic pegmatites and the Broken Hill-type Nine Mile MMSD, Australia, was analyzed for major and trace element chemical compositions to determine the relative degree of evolution of the pegmatites and identify chemical differences between Li-rich and Li-poor pegmatites and between these and MMSDs. In the spinel ternary diagram in terms of mol % gahnite (Ghn), hercynite (Hc), and spinel (Spl) end-members, the compositions of gahnite from the pegmatites fall within the previously defined pegmatite field and are given by: Ghn70.63−98.48Hc0.95−28.61Spl0.00−4.52. Gahnite from the Nine Mile deposit (Ghn55.62−76.06Hc17.47−37.34Spl3.81−10.73) falls within the MMSD field characterized by compositions that reach higher Mg and lower Zn contents compared to gahnite from granitic pegmatites. Gahnite from the LCT (lithium, cesium, tantalum) family, rare-element class, beryl-columbite-phosphate subtype and LCT family, muscovite-rare element class, Li subclass granitic pegmatites of the Comechingones (Blanca Dora, Juan Román, Magdalena, La Ona, and Sin Nombre pegmatites) and Conlara (Nancy pegmatite) pegmatite districts, Pampean Pegmatite Province, Argentina, was analyzed in detail. The chemical composition of gahnite from these pegmatites is defined by the ranges Ghn78.49−90.35Hc9.07−20.52Spl0.25−3.37. Gahnite from the Nancy pegmatite has higher Mg and Mn contents than gahnite from the Comechingones pegmatites. Chemical zoning within gahnite crystals is characterized by an increase in Zn (~2.8 wt.% ZnO) and a decrease in Fe (~2.6 wt.% FeO) from core to rim, reflecting the evolution of the pegmatite melt via simple fractional crystallization. Plots of molecular Fe vs. Zn and Fe+Mg vs. Zn+Mn and Zn/Fe ratios in gahnite display the diadochy and the relative degree of fractionation of the pegmatites. The Zn/Fe ratios range from 3.82 to 9.96. Based on all these parameters, the relative degree of evolution of the pegmatites increases in the order: Sin Nombre [arrow to] Magdalena [arrow to] Juan Román [arrow to] Blanca Dora [arrow to] Nancy [arrow to] La Ona. This order is consistent with mineralogical evidence and indicates that the composition of gahnite in granitic pegmatites can effectively be used to determine the relative degree of evolution of pegmatite melts. The trace elements present in gahnite are first-series transition metals (Ti, V, Cr, Co, Ni, and Cu), as well as Mn, Li, Ga, Cd, Sn, and Pb. Gahnite in the Nine Mile deposit reaches higher Ti, V, Cr, Co, Ni, and Pb and lower Mn, Li, Ga, Sn, and Cu contents than gahnite from granitic pegmatites. Gahnite from highly evolved granitic pegmatites of the Borborema Pegmatite Province, Brazil, has the highest Cu (up to 68 ppm), Mn (up to 8,819 ppm), Li (up to 376 ppm) and Zn (up to 43 wt.% ZnO) contents and these compositions may be good indicators of Li-rich pegmatites. This study shows that the major and trace element chemistry of gahnite in granitic pegmatites may be used to understand relative pegmatite evolution and to distinguish pegmatites that contain Li-mineralization from barren pegmatites.
Book Synopsis Granitic Pegmatites in Science and Industry by : P. Černý
Download or read book Granitic Pegmatites in Science and Industry written by P. Černý and published by . This book was released on 1982 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Geological Association of Canada Publisher :St. John's, N.L. : Geological Association of Canada ISBN 13 : Total Pages :360 pages Book Rating :4.F/5 ( download)
Book Synopsis Rare-element Geochemistry and Mineral Deposits by : Geological Association of Canada
Download or read book Rare-element Geochemistry and Mineral Deposits written by Geological Association of Canada and published by St. John's, N.L. : Geological Association of Canada. This book was released on 2005 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electron Microprobe Analysis of Rare-earth-element-bearing Phases from the White Cloud Pegmatite, South Platte District, Jefferson County, Colorado by : David Matthew Wayne
Download or read book Electron Microprobe Analysis of Rare-earth-element-bearing Phases from the White Cloud Pegmatite, South Platte District, Jefferson County, Colorado written by David Matthew Wayne and published by . This book was released on 1986 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Granites and Rare-element Pegmatites of the Aylmer Lake Pegmatite Field, Slave Structural Province, N.W.T. by : Paul Brian Tomascak
Download or read book Granites and Rare-element Pegmatites of the Aylmer Lake Pegmatite Field, Slave Structural Province, N.W.T. written by Paul Brian Tomascak and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lanthanides, Tantalum and Niobium by : Peter Möller
Download or read book Lanthanides, Tantalum and Niobium written by Peter Möller and published by Springer Science & Business Media. This book was released on 2013-11-09 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare Earth Elements (REE) as well as tantalum and niobium are of tremendous importance because of their specific high-technology applications. The contributions gathered in this volume give an up-to-date survey on the mineralogy, primary ore deposits, prospecting, processing and applications of REE, Ta, and Nd, making this volume a useful handbook for practitioners and students. Finally, the comprehensive coverage of the fundamental aspects, especially as regards REE as tracers of geological phenomena, will prove extremely helpful.
Book Synopsis New Discovery of Rare-element Pegmatite Mineralization, Separation Lake Area, Northwestern Ontario by : F. W. Breaks
Download or read book New Discovery of Rare-element Pegmatite Mineralization, Separation Lake Area, Northwestern Ontario written by F. W. Breaks and published by [Sudbury] : Ontario Geological Survey. This book was released on 1996-01-01 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Uraniferous Pegmatites in the Grease River Area, Northern Saskatchewan by : Suzanne Mickey Costaschuk
Download or read book Uraniferous Pegmatites in the Grease River Area, Northern Saskatchewan written by Suzanne Mickey Costaschuk and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study involves a portion of the Western Craton subdivision of the Churchill structural province of northern Saskatchewan. It is a detailed study of radioactive pegmatites bordering the Grease River in the Fond-du-Lac map area. Results from field, microscopic, oxygen stable isotope, O-Th-Pb mineral age dating, heavy mineral and electron microprobe mineral studies are used to summarize the geology and uranium mineralization of the Grease River property. The Precambrian basement is comprised of Tazin Group biotite gneisses and pink felsic gneisses. The thinly banded plagioclase-quartz -biotite gneisses developed under middle amphibolite facies metamorphism. The coarser-grained, leucocratic, K-feldspar-plagioclase-quartz-biotite gneisses are evidence of upper amphibolite facies conditions. The pelitic and felsic gneisses formed contemporaneously during a regional metamorphic event involving high temperatures and pressures. Petrological evidence suggests the biotite gneisses formed from low Al, Ca and high Fe, Mg, Ti argillaceous sediments, while the granitic rocks were derived by partial melting of a source similar in compostion to the more mafic units. White, massive pegmatites intrude and migmatize the Tazin Group assemblages. They mainly vary in compositon from trondhjeaite to two-feldspar and alaskite granites depending on the extent of K-metasomatism. The initial plagioclase-guartz-biotite trondhjemitic melt likely formed at temperatures greater than 685°C. At the time of intrusion, high temperatures existed which thermally metamorphosed and melted the gneisses. A later intrusive phase involving qua rtz-m usco vite veining, transformed some white pegmatites into quartz-rich granitoids and quartzolites. The silrcifiction took place during hypothermal conditions (300 to 50U°CJ which, consequently caused extensive alteration of the affected rocks. Zircon separates from biotite and granitic gneisses yield mid-Aphebian d-Pb dates of 2250 Ma. These results are interpreted as Kenoran (2500 0a) survival ages, up-dated by the younger Hudsonian orogeny which essentially re-set their U-Pb radiometric clocks. The white pegmatites have originated from more intensely remobilized portions of the Archean crust. The main trondhjemite to granite pegmatite is dated at 1970 0a, while the late-stage quartz enrichment yields 1845 Ma ages. Condiderable tectonic activity occured during the Hudsonian reactivation. Shearing, plastic deformation and major faulting of the biotite and granitic gneisses are observed in the affected portions of the Grease Fiver linear belt. Also, structural control of the emplacement of the syntectonic pegmatites is inferred since they form in an elongated, discontinuous zone paralleling the NE regional strike. Uranium mineralization is localized in the white pegmatites. Two periods of uranium enrichment are inferred from radiometric, geochronological, petrological and probe studies. In the first, cubic, Th-rich uraninite crystallized with the plagioclase-quartz-biotite assemblage. Common accessories are zircon, molybdenite, apatite, sphene, thorite and iron opaques. A second mineralization period occured during the hydrothermal silicification of the initial pegmatites. Uranium enriched zircons,thorium-bearing minerals and yellow uranyl mineralization are believed to have formed during this time.
