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Now showing items 21-40 of 161
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(2000)Diamond-bearing kimberlite fields accounts for about 15% of the total number of kimberlite fields of the Siberian Craton (SC). Diamond-bearing kimberlites are invariably located above the high density rock masses identified ...
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(2001)A review is presented of the currently available evidence of life in the Precambrian, with special reference to microfossils of the size range 0.1-3 μm. The particles are spotted in thin sections of the rock under high ...
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(1988)The predominant rocks of the Anabar shield are basic pyroxene-plagioclase schists, metaultramafics, and various gneisses and granites with a minor number of partings of amphibolite, quartz, marble, calciphyre and other ...
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(2003)Scaled analogue models of thin-skinned simultaneous shortening above adjacent viscous and frictional decollements simulate the effect of Hormuz salt on the shortening in the Zagros fold and thrust belt. The models consisted ...
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(2001)Thermobaric variation of electrical characteristics of sets of different gneisses from the Central Ukrainian Precambrian Shield were studied. Experiments were carried out on dry, air-dried and fluid-saturated samples at ...
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(1997)Prevailing petrogenetic models for Precambrian high-MgO melts such as komatiites invoke crystallization from nearly anhydrous melts (≪0.5% H2O) generated by partial melting of mantle peridotite at temperatures of (≤ 1900 ...
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(2003)On the basis of generalizations and analysis of new materials on regional and thematic research, the main problems involved with the evolution of the Paleo-Аsian ocean and structure of the huge Ural-Mongolian Fold Belt ...
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(1995)In oils and Precambrian- to Miocene-age source rocks from varying depositional environments, we have conclusively identified several novel 3-alkyl sterane and triaromatic steroid series, including (1) 3β-n-pentyl steranes, ...
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(1996)Neoproterozoic–Cambrian rocks of the Zavkhan Basin (Govi-Altay, western Mongolia) comprise large-scale alternations of siliciclastic- and carbonate-dominated units (cf. ‘Grand Cycles’). Analysis of such depositional sequences ...
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(1989)In 1985, primary sedimentary sulfates were discovered in Precambrian deposits of the Baltic Shield. The search for sedimentary sulfates was based on previous identification of the protoevaporite character of certain early ...
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(1989)Originally sedimentary sulfate-bearing rocks in the Precambrian of the Baltic shield were first identified in 1985. Sulfate sulfur was found in significant amounts only in chemogenic metacarbonate rocks and metamorphosed ...
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(1989)In 1978, in Precambrian metamorphosed bauxites of the Alag Uula deposit, we found a mineral identified as gibbsite high in copper and magnesium. This deposit is in western Mongolia in the eastern part of the Yihe Daribi ...
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(1988)Ultramafic rocks in the Precambrian sequence of the Eastern Sayan were traditionally classified as plutonic. Within the Khan-Ashkasok synclinorial trough of Early Proterozoic age studied by us, such rocks were mapped as ...
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(1990)Anorthosite of the independent type is a typical component of Precambrian granulite-gnesis, and the determination of its origin is very intimately related to a fundamental problem of geology, namely ascertaining the mode ...
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(1993)The reactions Bt + Qtz = Opx + Kfs + H2O, Bt1 + Qtz + (K2O) = Or + Bt2 +(n H2O), Mg-Ts(Opx) + Otz + (K2O) = Or + En, Pl1 + (K2O) = Pl2 + Or + (Na2O) and Prg + En + Qtz + (K2O) = Or + Ed recorded in unique rock textures and ...
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(1996)Syn-eclogite facies pseudotachylytes of the Bergen Arcs, western Norway, were formed during co-seismic faulting at a depth of 60 km during Caledonian continent collision, concurrent with fluid-induced partial eclogitization ...
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(2004)Two genetic families of "ancient" oils, the main currently prospected resources, are known on the Siberian Platform. The available information on organic geochemistry of naphthide deposits and syngenetically bituminized ...
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(1999)The Riphean and Vendian are characterized as a distinctive stage in the evolution of the biosphere. It is demonstrated that benthic and pelagic biotas of that time were sources of hydrocarbons in Precambrian sedimentary strata.
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(1988)The europium minimum often observed in Archean ultramafic and mafic rocks reflects both the effect of protomagmatic processes (fractional crystallization, accompanied by removal of feldspars and clinopyroxene from the ...
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(2001)Petrological, geochemical, and geochronological data for the basic-ultrabasic rocks of the Bulun block from the Sharyzhalgai uplift are reported, and the age and geodynamic environments of these geologic structures are ...
Now showing items 21-40 of 161