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1.
B. M. Mikhailov 《Lithology and Mineral Resources》2004,39(2):114-134
The presented overview of hypergene metallogeny of the Urals is largely based on original data of the author. All bauxite, Co–Ni oxide–silicate, and high-grade ferromanganese our deposits, gold, platinum, and diamond placers, as well as brown coal, kaoline, refractory, and other economic-grade mineral deposits, currently mined in the Urals are hosted in hypergene zones and related hypergene blankets of different ages. Prospects for diverse mineral deposits are estimated with a special emphasis on thermal hypergene deposits (Ni, Au, and others) that are atypical for the Urals but favorable for mining under conditions of the market economy owing to the presence of high-grade ore bodies. 相似文献
2.
B. M. Mikhailov 《Lithology and Mineral Resources》2000,35(4):351-364
Based on the analysis of long-term openpit observations of nickel oxide-silicate ores and literature data, characteristic
features of the nickel mineralization and raw mineral base for the nickel industry in the Urals are given. The present-day
critical situation in this field is outlined and means of the prospecting for high-grade nickel ore deposits in the Urals
are proposed. The development of such deposits should be feasible under conditions of the modern market economy. 相似文献
3.
Sobolev I. D. Vikentyev I. V. Travin A. V. Bortnikov N. S. 《Doklady Earth Sciences》2020,494(2):773-778
Doklady Earth Sciences - Dikes and sills of dolerites, essexite–dolerites, diorites, monzodiorites, and lamprophyres belonging to the Musyur (Malyi Khanmey) hypabyssal complex (Polar Urals)... 相似文献
4.
V. N. Puchkov 《Mineralogy and Petrology》2013,107(1):3-37
Five main structural and historical stages are established in the territory of the Urals: 1) Archean-Paleoproterozoic, a time of formation of the Volgo-Uralia subcontinent and its amalgamation with the other blocks of the craton of Baltica; 2) Riphean-Vendian (Meso- and Neoproterozoic), а stage that was finished with formation of Timanides; 3) Paleozoic-Early Mesozoic stage, corresponding to the development of the Uralides; 4) Mid-Jurassic-to Miocene platform stage; 5) Pliocene-Quaternary neo-orogenic stage. In this paper stratigraphic data are discussed, schemes of the structural zonation are presented, and the problems of the structural geology and geodynamics of sedimentary and magmatic complexes are discussed in a chronological order. Ideologically, the paper is based on plate and plume tectonics, in their modern versions. 相似文献
5.
An area with brick-red loose and viscous sandy-clayey rocks and brown ores with an average Fe content of 19.84% and possible
resources of 1 billion tons of metal was determined. Mn and Ti are the main alloying components; Ni, Co, Cr, V, and Zr are
additional; and goethite (FeOOH) is an ore mineral. 相似文献
6.
New processing of part of the Europrobe's Seismic Reflection Profiling in the Urals (ESRU) reflection seismic data in the Middle Urals shows a southwest‐dipping Moho imbrication and crustal underthrusting that was not previously imaged. The area of thickening associated with it roughly coincides with a deepening of the Moho imaged by the GRANIT refraction data. This feature does not fit with the currently known Palaeozoic crustal architecture of the Uralides or with its geodynamic history. Geological data suggest that it is not related to a relict southwest‐dipping subduction zone. Based on its lower crustal and Moho reflection seismic character it is presently interpreted to be a post‐Uralide feature, possibly related to Mesozoic intraplate shortening in the area. Its coincidence with a locus of mild earthquake activity further suggests that it might be active today. 相似文献
7.
The first find of srilankite (very rare Zr and Ti oxide, Ti2ZrO6) in the Urals and the third find in Russia is reported. Srilankite forms very small (0.5–20 μm) inclusions in some rutile grains. These minerals are observed in the rare rock variety, corundum-bearing spinel–saphirine hornblendite forming a block in serpentinized amphibolizied peridotite of the Ilmeny–Vishnevogorsk Complex, near the village of Taiginka, Chelyabinsk oblast. Srilankite has not been observed in such an association yet. The composition of the host rock provides evidence for its deep (the lowermost crust of the Earth) origin. Srilankites of the Urals are distinguished from all others by the high concentrations of UO2, ThO2, HfO2, and Nb2O5, which provides additional evidence for their crustal origin. Srilankite may indicate high-temperature and high-pressure conditions of rock formation. 相似文献
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I. V. Talovina V. G. Lazarenkov S. O. Ryzhkova V. L. Ugol’kov N. I. Vorontsova 《Lithology and Mineral Resources》2008,43(6):588-595
Oxide-silicate ore deposits containing approximately 10% of Ni reserves of Russia are located in the Sverdlovsk, Chelyabinsk, and Orenburg districts of the Urals. Garnierite is among the most important industrial minerals of supergene nickel deposits. We studied this mineral in metasomatites and ores of the Cheremshan, Sinar, Elov, Sakhara, and Buruktal deposits based on the chemical, thermal, and X-ray phase analysis data. It is shown for the first time that garnierites of the Ural province are composed of both exogenous and hydrothermal mineral associations. The spatial distribution of minerals suggests that the hydrothermal association is a lateral and vertical (depth) continuation of mineralization in the Uralian supergene deposits. This conclusion widens significantly the scope of prospecting for new mineralized sectors in old deposits and the possibility of discovery of new deposits. 相似文献
10.
Shmelev V.R. 《《地质学报》英文版》2015,89(Z2):85-86
<正>The Urals folded belt extending for about 2,500 km is located on the border between the East European and West Siberian platforms(Fig.1a).Its distinctive feature are the rocks of ophiolite association,which are the most well represented in the Main Uralian fault(MUF)zone.In the southern part of the MUF they form large ophiolite massifs 相似文献
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Geology of Ore Deposits - The geological position and mineral composition of specific troilite–quartz rocks (klyuchevites) are considered. They form separate interbeds among deep-water... 相似文献
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SHMELEV V. R. 《《地质学报》英文版》2016,90(Z1):239-240
正The mafic-ultramafic complexes and associated formationsare wide spread within the Ural folded belt,which is located on the boundary of the East European plate and West Siberian sedimentary basin.Two main 相似文献
15.
The Uralide orogen, in Central Russia, is the focus of intense geoscientific investigations during recent years. The international research is motivated by some unusual lithospheric features compared with other collisional belts including the preservation of (a) a collisional architecture with an orogenic root and a crustal thickness of 55–58 km, and (b) large volumes of very low-grade and non-metamorphic oceanic crust and island arc rocks in the upper crust of a low–relief mountain belt. The latter cause anomalous gravity highs along the thickened crust and the isostatic equilibrium inside the Uralides lithosphere as well as the overthrust high-metamorphic rocks. The integrated URSEIS '95 seismic experiment provides fundamentally new data revealing the lithospheric architecture of an intact Paleozoic collisional orogen that allows the construction of density models. In the Urals' lithosphere different velocity structures resolved by wide-angle seismic experiments along both the URSEIS '95- and the Troitsk profile. They can be used to constrain lithospheric density models: a first model consists of a deep subducted continental lower crust which has been highly eclogitized at depths of 60–90 km to a density of 3550 kg/m3. The second model shows a slightly eclogitized lower crust underlying the Uralide orogen with a crustal thickness of 60 km. The eclogitized lower crust causes a too-small impedance contrast to the lithospheric mantle resulting in a lack of reflectors in the area of the largest crustal thickness. Both models fit the measured gravity field. Analyzing the isostatic state of the southern Urals' lithosphere, both density models are in isostatic equilibrium. 相似文献
16.
A. V. Ryazantsev 《Doklady Earth Sciences》2018,482(1):1157-1160
New data on the Vendian age of the volcanogenic–sedimentary sequence of the Uraltau zone (Southern Urals) were obtained. The U/Pb (SHRIMP-II) isotope age obtained for zircons from rhyolite tuffs is 591.5 ± 3.5 Ma. The sequence under consideration is intruded by Vendian granites and overlain unconformably by Ordovician terrigenous and volcanogenic deposits. The composition of Vendian volcanics and granites testifies that they were formed in a suprasubduction setting at the continental margin, complexes of which are known in the Middle and Northern Urals. 相似文献
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L.P. Zonenshain V.G. Korinevsky V.G. Kazmin D.M. Pechersky V.V. Khain V.V. Matveenkov 《Tectonophysics》1984,109(1-2)
The Uralian Fold Belt originated due to the East European-Kazakhstan continental collision in the Late Paleozoic-Early Triassic. The Uralian paleo-ocean existed from the Ordovician to Early Carboniferous. It evolved along the Western Pacific pattern with island arcs and subduction zones moving oceanwards from the East European margin and leaving newly opened back-arc basins behind from the Silurian to the Middle Devonian. A fossil spreading pattern similar to present one can be reconstructed for the Mugodjarian back-arc basin with the spreading rate of 5 cm/yr and depth of basaltic eruption of 3000 m. Since the Devonian, the closure of the Uralian paleo-ocean has begun. A subduction zone flipped over under the Kazakhstan continent, and remnants of an oceanic floor were completely consumed before the Late Carboniferous. After that the continental collision began which lasted nearly 90 Ma. As a result, the distinct linear shape and nappe structure of the Urals were formed. 相似文献
19.
The composition of ophiolites widespread in the southern Urals shows that they were formed in a suprasubduction setting. Low-Ti
and high-Mg sheeted dikes and volcanic rocks vary from basalt to andesite, and many varieties belong to boninite series. The
rocks of this type extend as a 600-km tract. The volcanic rocks contain chert interbeds with Emsian conodonts. Plagiogranites
localized at the level of the sheeted dike complex and related to this complex genetically are dated at 400 Ma. The ophiolites
make up a base of thick islandarc volcanic sequence. The composition of the igneous rocks and the parameters of their metamorphism
indicate that subduction and ascent of a mantle plume participated in their formation. The nonstationary subduction at the
intraoceanic convergent plate boundary developed, at least, from the Middle Ordovician. 相似文献
20.
Massive sulphide deposits in the Urals are found within volcanic and volcanic-sedimentary sequences of Ordovician to Middle
Devonian ages. Four types of economic sulphide deposits have been recognized: Cyprus, Besshi, Urals and Baimak. The Cyprus-type
copper sulphide deposits are hosted by mafic volcanites that occur in the basal parts of Palaeozoic volcanic sequences. The
Besshi-type copper-zinc deposits are located within clastic sedimentary rocks intercalated with basalts and andesites. Zinc-copper
deposits of the Urals-type are hosted by bimodal rhyolite-basalt assemblages, which occur at a higher stratigraphic level
than those of Cyprus- and Besshi-types. The Baimak-type zinc-copper-barite deposits are associated with intrusive quartz porphyries
which occur in the upper parts of bimodal volcanic successions. In addition there are some sulphide deposits of zinc-lead-barite
and zinc-copper composition hosted by Ordovician terrigenous sequences which occur within depressions in Precambrian blocks.
These types of sulphide deposits have been formed at various stages of divergence and convergence of the Earth's crust during
the orogenic history of the Urals.
Received: 27 June 1997 / Accepted: 14 May 1998 相似文献