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Browsing ELibrary by Title
Now showing items 13407-13426 of 21768
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(2001)The purpose of the study was to use geochemical characteristics and apparent ages of sampled groundwaters to determine which of the two regionally extensive bedrock aquifers, the lower bedrock aquifer or the upper bedrock ...
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(2004)For the previously suggested for the platforms evolution series (ancient, mature, young, juvenile) the corresponding characteristic types of platform covers are specified. The principle scheme is given for bedding of various ...
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(1989)For the Yenisey Ridge, a region with a very complete Precambrian section in the southwestern part of the Siberian craton, we have analyzed the REE-distribution in granitoid rocks of genetically different types. These crustal ...
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(2004)A model describing the redistribution of masses of variable valence elements and their isotopes at a moving okidation front appearing in the course of oxygen-bearing water penetration into deep crustal levels was used to ...
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(2003)In the SW Urals a change of tectonic conditions occurred at around 620 Ma leading to a detrital input from contrasting provenance areas. Fifty-seven detrital zircons were separated from Proterozoic sandstones of this setting ...
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(2006)Alpine-type dunite-harzburgite-lherzolite massifs have long attracted much attention of geologists as reference objects for geological and petrological models and as massifs hosting economic deposits of Cr, Ni, and asbestos. ...
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(1987)The problem of the origin of bariopyrochlore and strontiopyrochlore in weathered carbonatite mantle must be solved by special methods, including systematic study of pyrochlore compositions in the supergene alteration zone ...
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(2000)The EPR method was for the first time used for studying composition, form, and structural transformations of paramagnetic impurities in major generations of halite from the zones of basic-rock-evaporite interaction. The ...
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(1989)The authors analyze a new Precambrian microbiota from the top of the Tyulmen beds that constitute the top of the Avzyan Formation of the Middle Ripean of the southern Urals. This microbiota is interesting for two reasons. ...
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(1997)U-Pb dating of zircons from the reference granitoid complexes showed that principal thrusts in the northern flank of the junction zone between the Olekma granite-greenstone and Aldan granulite-gneiss terranes of the Aldan ...
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(2005)We have undertaken petrologic and SHRIMP U-Th-Pb isotopic studies on zircons from basaltic eucrites (Yamato [Y]-75011, Y-792510, Asuka [A]-881388, A-881467 and Padvarninkai) with different thermal and shock histories. ...
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(1999)The Palaeozoic Uralian orogen formed by accretion of island arcs and microcontinents along the eastern margin of the East European platform. In the middle Urals, a promontory of the East European platform, the Ufaley Complex ...
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(2001)The bedrock of the Sodankylä schist area consists mainly of Paleoproterozoic volcanic and sedimentary rocks penetrated by mafic and felsic intrusives. This paper reports c. 200 conventional U-Pb analyses mainly on zircon. ...
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(1998)Thirty-one detrital zircons from the mid–late Riphean Mayamkan Formation sandstone (Uy Group) of the Sette–Daban fold belt, southeast Siberia yielded SHRIMP 207Pb/206Pb ages ranging between 1500 and 1050 Ma. Other grains ...
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(2001)The bedrock in eastern Lapland is divided into the Naruska, Ahmatunturi and Vintilänkaira-Kemihaara granitoid complexes and the supracrustal Tuntsa metasedimentary and Tulppio metavolcanic belts. Traditionally the bedrock ...
Now showing items 13407-13426 of 21768