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Now showing items 21-40 of 163
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(2002)The occurrence of quartz-pebble conglomerates (QPC) in the rock record increases backward through time from the Tertiary through the Precambrian. The positive correlation between QPC abundance and age is valid both for ...
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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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(2006)The East European Platform is underlain by Archaean and Proterozoic complexes of the East European Craton. In the southwest these are locally exposed in the Ukrainian Shield and the Voronezh Massif on either side of the ...
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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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(Федеральное государственное бюджетное учреждение науки Институт земной коры Сибирского отделения Российской академии наук, 2017)
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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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(2006)The Precambrian Egersund anorthosites exhibit a wide range of groundwater chemical composition (pH 5.40-9.93, Ca2+ 1.5-41 mg/L, Na+ 12.3-103 mg/L). They also exhibit an evolutionary trend, culminating in high pH, Na-rich, ...
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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 ...
Now showing items 21-40 of 163