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Now showing items 7743-7762 of 39124
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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 ...
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(1998)Kalifersite, (K, Na)5(Fe3+)7[Si20O50](OH)6 · 12H2O, is a new [001] fibrous silicate discovered in a drill core of a hydrothermally altered pegmatite in the urtite series at Mt. Kukisvumchorr (Kola Peninsula). The new mineral ...
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(EGU General Assembly 2016, 2016)
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(Japan Geoscience Union, 2017-05-20)
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(EGU General Assembly 2018, 2018)
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(2000)
Now showing items 7743-7762 of 39124