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Browsing ELibrary by Title
Now showing items 6256-6275 of 21934
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(2002)Structural features and composition of Jurassic deposits in the Kafan tectonic block that is located in the southeastern part of the Lesser Caucasus are considered. Three carbonate members bearing foraminifers are distinguished ...
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(2004)The study is devoted to Jurassic gastropods of the Central and Central Chernozem regions of Russia. Thanks to the exact locality data on the collected material, the stratigraphic ranges of many species were refined. Several ...
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(2004)A caddisfly Dolophilodes ( Sortosella ) shurabica subgen. et sp. nov. (Philopotamidae) is described from the Jurassic of Kyrgyzstan, from the Sai-Sagul locality. The ecology and taphonomy of this locality are analyzed, and ...
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(1999)The latitudinal models of radiolarian paleogeographic provinces are considered, and Late Jurassic boreal radiolarian assemblages of Russia are characterized. Several Jurassic radiolarian assemblages from the Koryak Upland ...
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JURASSIC TRACHYBASALT-COMENDITE-ALKALI GRANITE VOLCANO-PLUTONIC ASSOCIATION OF EASTERN TRANSBAIKALIA (1989)Alkali basalt-comendite associations are a typical rock type of rift-generated structures and are known both in continental regions (the Basin and Ridge Province of the U.S., and in Mongolia) and in island-arc regions ...
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(2002)Geologic and paleomagnetic research in the western part of the Omolon massif and in the Sugoi folded zone, northeastern Russia, suggests significant lateral displacements of these units relative to one another and with ...
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(2004)This communication presents estimates of the magmatogenic CO2 influx into the atmosphere at the Permian-Triassic boundary during STP Siberian trap province formation.
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(1990)The 3He/4He in materials derived from the mantle is decreasing in the course of time and approaches the radiogenic value during {approx equal} 1 Ga. Some minerals, however, trapped volatiles, including He, and preserve ...
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(1992)The important geodynamic parameter, the ratio in rocks and fluids of the continental crust, is generally decreasing from the mantle values (≅10−5) to the radiogenic ratio (≅10−8) on the time scale of about 1 Ga or less. ...
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(2003)The He isotopic composition was studied in Archean enderbites, aluminous gneisses, and alkaline granites of the Kola Peninsula. It was shown that enderbites formed after intrusive protoliths during their granalite metamorphism ...
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(1997)Clinopyroxene (Cpx) is a principal upper-mantle phase for concentrating large cations but has not been viewed as a major crystal-chemical reservoir for K because K 1 is considered too large to enter the largest site, M2, ...
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(2000)Potassium and magnesium isotopic compositions of hibonites from the Murchison (CM) and Allende (CV) meteorites are determined by an ion microprobe to look for possible presence of the short-lived nuclides 41Ca and 26Al at ...
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(1996)For the purpose of the geological mapping of Cenozoic volcanic rocks in South Kamchatka, K-Ar ages of the rocks were determined using 30 whole rock samples. The rocks of the andesite association were found to be of the ...
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(1999)Abstract-Two clay fractions of a Cambrian claystone from Estonia, consisting essentially of illite and 20% expandable illite-smectite, (I-S) were treated with C12 and C,8 alkylammonium cations for K-exchange. Both the ...
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(1999)The aim of this paper was to report and discuss the data available for the K-Ar dating of effusive rocks from a few centers of recent volcanic activity in the Kazbek region (Great Caucasus) of the Caucasian segment of the ...
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(1998)Felsic magmas may evolve one or more water or chlorine-rich fluid phases which can transport heat and solutes into associated hydrothermal systems and can contribute to alteration and ore deposition. To understand the role ...
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(2002)Fine grained rodingite-like rocks containing epidote, clinozoisite, garnet, chlorite, phengite and titanite occur within antigorite serpentinite boudins from the high-pressure metamorphic Maksyutovo Complex in the Southern ...
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(1997)A database of published information was compiled to develop K-U-Th systematics of oceanic island-arc (OIA) volcanic rocks. In order to obtain a pure case of subduction-related oceanic volcanism, the data set for the OIA ...
Now showing items 6256-6275 of 21934