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Now showing items 9617-9636 of 43490
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(2006)Late Jurassic formations of the Northern Calcareous Alps (NCA) contain ample evidence of synsedimentary tectonics in the form of elongate basins filled with turbidites, debris flows and slumps. Clasts are derived from the ...
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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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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет», 2018)The article discusses the issues of justifying the data volume for a petrophysical description of an object based on the results of traditional laboratory measurements, as well as X-ray tomography data processing. A new ...
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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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(2006)We present petrographic and geochemical data on representative samples of the Devonian adakite, boninite, low-TiO2 and high-TiO2 basalts and associated rocks in the southern Altay areas, Xinjiang, NW China. These volcanic ...
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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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(2006)Late Cenozoic magmatism in the Greater Caucasus during the last 8.5 Ma was manifested in the Elbrus, Kazbek, and Central Georgian neovolcanic regions. In our work, we present K–Ar dates obtained for young rocks of Central ...
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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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(2006)The K-Ar method and its modifications play a unique role in the geochronology of young volcanic rocks, which has important fundamental and economic aspects. This method provides an opportunity for dating Quaternary rocks, ...
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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 ...
Now showing items 9617-9636 of 43490