Download or read book Geological Structural Mineralogical and Geochemical Controls of the Formation of the Uranium rich Ores in the Streltsovsky Ore Field Russia written by Alexei Aleshin and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ambiguity in the genetic interpretations in the formation of the Mo&U deposits of the Streltsovsky ore field led us to perform additional studies which have established that closely associated U and F were progressively gained in the Late Mesozoic volcanic rocks from the older basic (170 Ma) to the younger silicic ones (140 Ma). The Early Cretaceous postmagmatic hydrothermal epoch (140-125 Ma) is subdivided into preore, U ore, and first and second postore stages. The primary brannerite-pitchblende ore was formed associated with fluorite. During the first postore stage, it was replaced by a U-Si metagel, previously identified as coffinite. The preore metasomatic alteration and related veined mineralization were formed under the effect of Na (bicarbonate) chloride solution at temperatures of 250-200°C. Uranium ore formation began with albitization and hematization of rocks affected by a supercritical fluid at 530-500°C; brannerite and pitchblende precipitated at 350?300°C. The chondrite-normalized REE patterns of pitchblende hosted in trachybasalt, trachydacite, and granite demonstrate a pronounced Sm-Nd discontinuity and a statistically significant tetrad effect of W type. These attributes were not established in REE patterns of rhyolites derived from the upper crustal magma chamber. These data and the gap of 5 Ma between silicic volcanism and ore formation do not allow us to suggest that U was derived from this magma chamber. According to the new proposed model, an evolved silicic Li-F magma was a source of U. U4+, together with REE were fractionated into the fluids as complex fluoride compounds. The U mineralization was deposited at a temperature barrier.
Download or read book Siberian Traps and Pt Cu Ni Deposits in the Noril sk Area written by Nadezhda A. Krivolutskaya and published by Springer. This book was released on 2015-12-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses fundamental problems in the evolution of magmatic and ore-forming processes in the Noril’sk area of northern Central Siberia. Based on data on the geology and geochemistry of rocks, obtained by the author in the course of fieldworks and new analytical studies (applying XRF, ICP-MS, microprobe analysis, ion-probe analysis and studying melt and fluid inclusions in olivine, as well as stable and radiogenic isotopes in the rocks), it was proposed a new scheme for the evolution of magmatism, including two episodes: rift and trap per se. The ultramafic-mafic massifs are classified into three geochemical types, the most important of which (the ore-bearing Noril’sk type) was formed in post-Nadezhdinsky time as an independent pulse of magmatic activity. The primary melts for ore-bearing intrusions had tholeiitic composition with elevated MgO (8 wt%) and low volatile contents (data form melt inclusions in olivine and pyroxenes, in combination with numerical simulations using the COMAGMAT program package). The assimilation of host rocks by the parental melts was studied in the contact zones of the Maslovsky and Talnakh intrusions. It was shown that it had taken place only in narrow zones (about 1-2 m) and did not played sufficient role in ore formation. It was suggested that the source of the material was lower crustal rocks in long-lived rift zones, where sulfides accumulated in several stages. The book offers a valuable resource for specialists in the geology of ore deposits and petrology, as well as for advanced Geology students.
Download or read book Summary of the Geology Economic Aspects and Geochemistry of the Schwartzwalder Uranium bearing Area Ralston Buttes District Jefferson County Colorado written by Edward Joseph Young and published by . This book was released on 1985 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of relations between uraniferous mines and prospects in the Front Range near Golden, Colorado.
Download or read book The Geology of Russia in Europe and the Ural Mountains written by Roderick Impey Murchison and published by . This book was released on 1845 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemical Modelling of Secondary Uranium Ore Formation written by D. Sverjensky and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemistry and Mineralogy of the Colorado Plateau Uranium Ores written by and published by . This book was released on 1959 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Scientific Study of Soviet Mineral Resources written by Aleksandr Evgenʹevich Fersman and published by New York : International Publishers. This book was released on 1935 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology of Ore Deposits written by and published by . This book was released on 2003 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Geology of Russia in Europe and the Ural Mountains written by and published by . This book was released on 1845 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lithostratigraphic and Structural Controls of Uranium Mineralization in the Kiggavik East Zone Centre Zone and Main Zone Deposits Thelon Basin Nunavut written by Dillon Daniel Johnstone and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Kiggavik uranium deposits are located in the north-central Rae Subprovince of the Western Churchill Province and are hosted in highly deformed Archean and Paleoproterozoic basement rocks proximal to, and underlying the Thelon Basin. This field-based study documents the lithostratigraphic and structural character of Kiggavik's basement rocks and their controls on the uranium deposits. Field investigation, coupled with structural analysis, geochemistry and geochronology indicates that the basement rocks comprise two main tectonostratigraphic packages: a structurally 'lower-package' comprising ~2.71 Ga Pipedream assemblage metagreywacke and a structurally 'upper-package' consisting of multiple intervals of ~2.6 Ga Snow Island Suite felsic epiclastic and metarhyolite intercalated with less than 2.3 Ga quartzite of the Ketyet River group. Of particular significance are the epiclastic rocks, which, based on their textural variability, felsic composition, negative europium anomaly and association with metarhyolite, are correlated with previously identified epiclastic volcanic rocks in the western part of the area, rendering this the most spatially extensive rock unit at Kiggavik. Further, field investigation, coupled with structural analysis, confirms that all units form a homoclinal sequence that dips gently NNW in the eastern map area (Domain 1) and ENE in the western map area (Domain 2). Based on regional stratigraphic relationships, down-section profiles in both domains contain multiple younging direction reversals. This, coupled with strongly transposed bedding, ubiquitous foliation and highly strained contacts, plus the direct observation of isoclinal, recumbent folds in both outcrop and drill core, indicates that these repetitions are tectonic. In addition, across both domains, all units carry a well-developed stretching lineation. The collective 3D geometry and associated fabric elements are diagnostic of sheath folding and related thrusting under an ENE-WSW tectonic transport direction during DP1 when the upper (epiclastic-metarhyolite-quartzite) package is interpreted to have been translated over the more competent metagreywacke below. Although once misunderstood, the difference in dip direction between domains is ascribed to a domain-bounding NNW-trending fault that misoriented blocks, causing late-stage dragging and down-dropping of all units in the east during late, dip-slip motion along the Thelon Fault. In general, late brittle deformation is manifested by ENE-trending regional-scale Group 1 faults and local-scale Group 2 faults that collectively define a Riedel shearing system driven by dextral strike-slip displacement along the Thelon Fault. Detailed study at the Centre Zone deposit revealed that during Phase 1 mineralization steeply dipping D- and P-shears served as conduits for fluids to move through and penetrate earlier-formed ductile structures. The fluids preferentially infiltrated through, and precipitated uranium in, the more porous-permeable epiclastic and metagreywacke, while the quartzite served as an overlying aquitard. Phase 2 mineralization resulted from the reactivation of these structures, when remobilizing fluids redistributed uranium along planar brittle structures. In addition to the Hudson and Kivalliq granites, felsic Snow Island Suite rocks may have also been a significant source of uranium.
Download or read book Geological survey and mineral resources of Russia in the beginning of the XXI century written by and published by . This book was released on 2001 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Geology of Uranium written by Consultants Bureau Enterprises and published by . This book was released on 1958 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Geology of Uranium written by and published by . This book was released on 1958 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemical Associations and Zonal Structure of Uranium and Selenium Ore Bodies in Sandstones of the Red Rock Series written by P. P. Shilovskiy and published by . This book was released on 1970 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemical and Mineralogical Characterization of Uranium and Thorium Deposits written by Leonid Shumlyanskyy and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A geochemical and mineralogical investigation of the mobility of uranium and other lithophile elements during high grade metamorphism written by M. B. Fowler and published by . This book was released on 1985 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theoretical and Practical Aspects of Uranium Geology written by F. R. S. S. Bowie and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
