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Now showing items 101-120 of 185
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(2004)We report, for the first time, a direct, atomic-scale characterization of Pb in zircon (4.4 3.1 Ga) from the early Archean Yilgarn craton in Australia using high-resolution HAADF-STEM. Two forms of Pb have been identified: ...
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NEW DATA ON GEOCHEMISTRY OF THE OLDEST (2.95-3.05 GA) ANDESITE ASSOCIATION IN EASTERN FENNOSCANDIA (2003)The paper presents results of geochemical study of the oldest (2.95–3.05 Ga) andesite association of the Chalka volcanic structure, which is a member of the Archean Vedlozero–Segozero greenstone belt located in the ...
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(2001)The crystalline basement in the west of the East European Platform is composed of arc-shaped tectonic belts and blocks metamorphosed to the amphibolite and granulite facies. Our recent geochronologic dating (U-Pb on zircon ...
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(1988)The basement of the western part of the Siberian craton was penetrated to below 3798 m in the Kochumdek No. 3 well, drilled in the Turukhansk district, between the Lower Tunguska and the Bakhta Rivers, in the field occupied ...
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(1988)Our petrologic and geochemical study of the Archean Goran group in the southwestern Pamirs has revealed the wide extent of cordierite rocks formed after magnesite. Geologic and petrographic criteria clearly indicate that ...
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(2000)The Proterozoic connection between northeastern Siberia and western Laurentia that we proposed in 1978 is strongly supported by several new lines of evidence. New age data and refined structural trends in predrift basement ...
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(1998)Field studies combined with chemical and isotope data indicate that the Kostomuksha greenstone belt in the NW Baltic Shield consists of two lithotectonic terranes, one mafic igneous and the other sedimentary, separated by ...
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(2002)During the last three billion years, the Earth has been experiencing a slow global cooling, expressed in the progressively increasing frequency and scale of glacial events. Based on these indications, geologic history can ...
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(2001)Orogenic gold deposits have formed over more than 3 billion years of Earth's history, episodically during the Middle Archean to younger Precambrian, and continuously throughout the Phanerozoic. This class of gold deposit ...
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(2001)The Vetreny belt in the southeast Baltic Shield is a large volcano-sedimentary basin containing a 4- to 8-km-thick sequence of basaltic to komatiitic lavas, which were erupted 2.45 Ga ago in a continental rift setting ...
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(1994)The oxygen isotopic composition of 76 samples of olivine in spinel-, garnet- and diamond-facies peridotites, and as syngenetic inclusions within diamond has been determined by laser fluorination (LF). δ18OV-SMOW values of ...
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(1991)Inverse theory is used to calculate the melt distribution required to produce the rare earth element concentrations in a wide variety of terrestrial and extra-terrestrial magmas. The concentrations of the major and minor ...
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(2002)The partitioning of an extensive suite of trace elements between garnet, clinopyroxene, and hydrous tonalitic melts has been studied experimentally at 1.8 GPa and 1000–1040°C. The knowledge of trace element partitioning ...
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(1994)The Salmi batholith is situated on the eastern edge of the EW-trending anorthositerapakivi granite belt of the Fennoscandian shield, at the contact between Proterozoic and Archean crustal domains. The tectonic setting and ...
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(1998)Felsic-volcanic hosted massive sulphide deposits form in many different geotectonic environments usually associated with episodes of extension. However, empirical geochemical links between felsic volcanism, geotectonic ...
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(1997)New isotope and trace element data are presented for komatiitic basalts and a related peridotite Vinela Dike from the large Vetreny Belt in the southeastern Baltic Shield. The MgO contents of the erupted and intruded magmas ...
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(2002)The basement of the Early Proterozoic Pechenga paleorift was penetrated by the Kola Superdeep Borehole over a depth interval of 6842-12,261 m. The principal types of basement rocks are gneisses of trondhjemite-tonalite ...
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(1996)In the central Vetreny Belt, southeastern Baltic Shield, an areally extensive 110 m deep lava lake is exposed consisting of remarkably fresh differentiated komatiitic basalt. During eruption, the liquid had a temperature ...
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PETROLOGY OF A LOWER CRUSTAL XENOLITH SUITE FROM DIKES AND EXPLOSION PIPES OF THE KANDALAKSHA GRABEN (2001)The lower crustal xenolith suite contained in alkaline-ultramafic dikes and the explosion pipes of the Kandalaksha graben, northwestern Belomorie, consists of Grt granulites (Grt-Cpx-Pl ± Qtz), two-feldspar Grt granulites ...
Now showing items 101-120 of 185