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Now showing items 61-80 of 370
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(2003)Recent discoveries define a global scale fluid reservoir residing within the uppermost igneous oceanic crust, a region of seafloor that is both warm and may harbor a substantial biosphere. This hydrothermal fluid reservoir ...
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(2004)We report new absolute palaeointensity estimates using basalts from northeastern China (K/Ar age, 125-120 Ma) using the modified Shaw method in conjunction with the microwave technique. Samples for the palaeointensity ...
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(1995)Experimental melting studies indicate that secular variations in the geochemistry of many komatiites were determined by secular variations in the depth of melt segregation in plumes. Higher pressures stabilize garnet ...
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(1987)The authors investigated spheroidal rhyolite samples from the Paren' volcanic field in the Evensk zone of the Okhotsk-Chukotka belt. The Upper Cretaceous volcanic sequence here is dominated by latite-andesite and andesite-basalt ...
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GEOCHEMICAL FACIES ANALYSIS OF FINE-GRAINED SILICICLASTICS USING TH/U, ZR/RB AND (ZR+RB)/SR RATIOS (2001)Abundance of the trace elements Zr, Rb, Sr, Th and U may provide insight into the sedimentological origin of fine-grained siliciclastic sediments, provided that the units are derived from similar source areas, as demonstrated ...
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(1997)Research was carried out into the fractionation of carbazoles in oils in connection with the hypothesis that the composition of carbazoles in oils is very sensitive to the process of migration. The original composition of ...
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(2001)The first data are reported on the isotopic and trace-element composition of potassic igneous rocks from central Kamchatka. The composition of minerals and distribution of incompatible elements in volcanic (shoshonitic and ...
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(2001)New data on the trace element distribution in rocks of volcanic-plutonic associations from the vicinity of the Karamken gold-silver deposit are reported. The deposit is localized in the outer zone of the Cretaceous ...
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(2001)It is proposed that there are three types of gold deposits in Eastern and Central Transbaikalia (Trans-Baikal province), namely: (i) high-sulphide intrusion-related deposits with some signs of porphyry deposits, (ii) ...
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(1989)Analysis of the evolution of Phanerozoic stratigraphic complexes of the western margin of the East European craton (EEC) and the Central European Platform (CEP) shows that their formation depended on the corresponding ...
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(2001)Some specific features of the geological structure and ore mineralogy of the Khakandzha silver and gold deposit are discussed. The main ore masses are accumulated in complex, gently inclined, veined metasomatic zones. The ...
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(1999)Principal geological and paleogeographic events of the Late Cretaceous time are considered. Movements of continental blocks, changes in oceanic and atmospheric circulation, and interrelated climatic fluctuations during the ...
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(1999)A new genus and species Cretasalia tsybini (Gobiatidae, Anura) from the Late Cretaceous (Campanian-Maastrichtian) locality Khermeen-Tsav (South Gobi Region, Mongolia) is described from a skull and part of the skeleton. ...
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(1999)The Rb-87/Sr-86 and Sr-87/Sr-86 ratios of Laptev Sea sediments, of Arctic Ocean sediments and of suspended particulate matter (SPM) from Siberian rivers (Lena and Khatanga) form 'pseudo-isochrons' due to grain-size separation ...
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(1989)Detailed stratigraphic schemes of the Upper Cretaceous sediments in the Caucasus allowed us to identify the presence of hiatuses and intraformational erosion surfaces based on the omission of one or another stratigraphic ...
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(2003)A new sequence of axisymmetrical spherical mantle convection simulations has been computed to monitor the influence of mantle avalanches on the mantle thermal state. During an avalanche that is characterized by a high rate ...
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(1998)A large body of data was collected in this study and systematized in terms of the ages of intraplate volcanic activities in the Pacific Ocean. Analysis of the data revealed a dependence of the intensity of volcanism on the ...
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(2002)Hopanoic acids were found in all but the two most mature of a suite of 30 Triassic to Cretaceous sedimentary rocks. Their carbon number distributions generally maximise at C32, consistent with hopanoic acids found in modern ...
Now showing items 61-80 of 370