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Now showing items 61-80 of 161
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(2002)The isotopic composition of He and Ar was analyzed in rocks and minerals from the Early Protero-zoic Litza-Araguba diorite-granite complex in the northwestern part of the Kola Peninsula. The initial 4He/3He ratio of the ...
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(2000)The major-element composition of a grain of peridotitic Cr-pyrope garnet, coupled with a temperature estimate (TNi) derived from its Ni content, can be used to calculate the forsterite (Fo) content (100Mg/(Mg+Fe)) of the ...
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(2004)The post–2.0 Ga Proterozoic C isotope record reveals two distinct, yet interrelated trends: a stepwise increase in average δ13C from ∼0‰ (calculated with respect to the Peedee belemnite isotope standard) prior to ca. 1.3 ...
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(2003)The late Proterozoic Dovyren dunite-troctolite-gabbro layered massif in the northwestern Baikal area has the morphology of a sill and shows evidence of the replacement of a terrigenous-sedimentary rock sequence, including ...
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(2000)The structure of the Central Pamirs is defined by piled-up large tectonic nappes, characterized by a quite definite and rather sustained sequence of stratification for the whole zone. Autochthone is represented by Early ...
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(1990)A new copper-ore show was found within the Devonian clastic series in the southeast of Haakon VII Land, on Mt. Sigurd, near the tectonic contact with the Upper Proterozoic metamorphic rocks of the Hekla Hook complex. The ...
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(1990)The presence of igneous rocks of mafic composition (diabases and dolerites) in the caprock of the Seregovo salt dome, about 75 km north of Syktyvkar, in a platform region with a large area of Mesozoic-Cenozoic sedimentary ...
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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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(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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(1990)We examined a paragenesis of platinum-group mineral phases in ore-bearing metasomatic rocks occurring in a Lower Proterozoic sequence of shungite-bearing metaschist. These metasomatic rocks exhibit no signs of genetic ...
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(1998)We report on the occurrence of fullerenes in Proterozoic shungite (∼2 Ga) from the shungite mine, Kondopoga, Karelia, Russia (62.12°N 34.17°E). The presence of fullerenes has been confirmed by mass spectrometry, with peaks ...
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(1998)The results of joint fieldwork with geologists from the Geological Survey of Norway refine the Upper Proterozoic correlation scheme for the Barents Sea region and substantiate recognition of three structural-facial zones: ...
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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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(2000)Phyllonite and metaquartzite clasts occur in early Pliocene or possibly Miocene sediment at the base of the University of Wisconsin Arctic Ocean core Fl-380. Single-crystal 40Ar/39Ar laserprobe ages derived from feldspars ...
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(2004)This study presents the first extensive data set of Os isotopic compositions of primary Ru–Os–Ir alloys and Ru–Os sulfides derived from two Neoproterozoic ophiolite-type ultramafic massifs (Kunar in Northern Taimyr, Russia, ...
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(1996)Oulankaite, ideally (Pd,Pt)s(Cu,Fe)4SnTe2S2, is a new mineral species, occurring in pegmatoidal, plagio-clase-bearing pyroxenite hosted by a microgabbronorite in the Early Proterozoic Lukkulaisvaara mafic-ultramafic layered ...
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(2003)Palaeomagnetic data are used to study the configurations of continents during the Proterozoic. Applying stringent reliability criteria, the positions of the continents at 12 times in the 2.45- to 1.00-Ga period have been ...
Now showing items 61-80 of 161