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Now showing items 61-80 of 125
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(2002)A multidisciplinary approach was used to study the Lower Riphean deposits in the Siberian hypostratotype of the Riphean in the Uchur region of the southeastern Siberian platform and to clarify their relationships with the ...
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(2002)Sr isotopic composition in carbonate rocks of the Baikit anteclise and Yenisei Ridge, western margin of the Siberian craton, has been analyzed. These rocks were formed between 1500-1450 and 850 Ma. Carbonate deposits of ...
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(2001)The Kola-Kanin Monocline has been recently recognized as a potentially prospective region for hydrocarbon discoveries. There may be good generating potential within Riphean grabens. Sedimentary sequences of the Riphean ...
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(2004)The Kamennoe gold sulfide deposit, situated in Riphean volcanogenic-sedimentary deposits of the Yakornaya suite (island arc complex) in Northern Transbaikal region, was studied. Unlike many gold quartz vein deposits and ...
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(1999)Changes in the abundance and taxonomic composition of organic-walled microfossil assemblages of the Late Riphean Miroedikha microbiota, one of most diverse and thriving in the Proterozoic, were analyzed at ten discrete ...
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(1998)The paper presents new data on taxonomic composition and formation environments of the Late Riphean Miroedikha microbiota from the Turukhansk Uplift, where it consists of organic-walled fossils and is most abundant and ...
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(2004)The major and trace element geochemistry of the Burzyan fine-grained aluminosilicate clastic rocks of the Bashkir Anticlinorium was used to estimate the composition of provenance and its evolution from 1650-1640 to 1350 ...
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(2004)The Bashkir Meganticlinorium (BM) is on the western slope of the southern Urals. The Lower and Middle Riphean sedimentary sequences of the BM host very large stratiform magnesite and siderite deposits, barite, lead, and ...
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(1992)The Caledonides of Ny Friesland comprise the type Hecla Hoek sequence of Svalbard, a succession of late Proterozoic to Ordovician strata greater than 18 km thick. Three supergroups constitute the sequence: the Stubendorffbreen ...
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(2000)Epigenetic alterations and secondary Pb-Zn mineralization in carbonate rocks of the Min'yar Formation represent a serious problem for the direct measurements of Pb-Pb ages in these upper horizons of the Upper Riphean ...
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(2002)Within the Alatau anticlinorium of the South Urals (the Zilim River middle course), structure and sedimentation settings of terrigenous and carbonate deposits of the Tangaur Subgroup of the Upper Riphean Karatau Group are ...
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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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(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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(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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(1998)U-Pb and Pb-Pb isotopic systems were studied in limestones of the Inzer Formation representing the middle part of the Karatau Group of the Urals, whose section is authorized as the Upper Riphean stratotype. Carbonate rock ...
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(2004)There are two types of sparry magnesite deposits in the Southern Urals province: 1 ) layer-like bodies in the stratigraphic dolostone horizons; 2) lens-like bodies in the dolomitized limestones. The sparry magnesite deposits ...
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(1989)Microprobe study of zircon parageneses in migmatites of different origin shows that the geochemical properties of zircon could be used to solve important petrological and geochemical problems. The standards employed for ...
Now showing items 61-80 of 125