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Now showing items 41-60 of 71
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(1998)The Lilljeborgfjellet Conglomerate Formation composes the lower part of the alluvial Siktefjellet Group of northwestern Spitsbergen's Old Red Sandstone succession. Siktefjellet strata are of late Silurian or early Devonian ...
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RARE EARTH ELEMENTS AS INDICATORS OF FORMATION CONDITIONS OF PALEOPROTEROZOIC METASEDIMENTARY ROCKS (2004)Ascertaining the formation conditions of Precambrian metasedimentary rocks is difficult, and geochemical methods are commonly used in this respect. The application of rare earth elements (REEs) is based on the concept of ...
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(2002)The sialic (volcanogenic) material of the terranes in 3the Siberian fragment of a Paleoproterozoic supercontinent separated from the mantle 3.5, 3.3, 3.0, and 2.5 billion years ago. The collision zones (sutures) between ...
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(1997)The Hecla Hoek Complex, a ∼ 18-km-thick succession in the Svalbard Caledonian Eastern Terrane, has been interpreted to be a more or less continuous volcano-sedimentary sequence. Amphibolite-facies rocks in the lower parts ...
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(2004)The oldest volcanic glass in the uniquely fresh siliceous high-Mg (boninite-like) lavas of the Vetrenyi Poyas complex with an age of about 2.41 Ga from the Vetrenyi Poyas rift structure in Karelia was studied for the first ...
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(2004)This article reports the discovery of numerous subaerial exposure surfaces which occur in the ca. 2200 Ma Kuetsjärvi Sedimentary Formation (KSF) from the Pechenga Greenstone Belt, NE Fennoscandian Shield, Russia. The ...
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(2000)The Palaeoproterozoic Ni–Cu sulphide deposits of the Pechenga Complex, Kola Peninsula, occur in the lower parts of ferropicritic intrusions emplaced into the phyllitic and tuffaceous sedimentary unit of the Pilgujärvi Zone. ...
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(2004)The deep structure of the gabbro–anorthosite–rapakivi granite (“AMCG-type”) Korosten Pluton (KP) in the northwestern Ukrainian Shield was studied by 3-D modelling of the gravity and magnetic fields together with previous ...
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(2002)This paper considers new data on the geological structure of the mafic-ultramafic intrusions of the Monchegorsk ore district. It is established that some of them (Mts. Yagel'naya and Ospe) enclose horizons of altered ...
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(2003)Since Early Precambrian volcanic rocks are typically strongly altered by superimposed processes, they retain primary composition and texture only in exceptional cases. Such a case is observed in the Early Paleoproterozoic ...
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(2001)The large range of chemical variation within intimately associated highly magnesian volcanic rocks in the Palaeoproterozoic Central Lapland Greenstone Belt prompted the construction of a new classification scheme for ...
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(2001)U–Pb isotopic dating has been carried out on titanites and rutiles from the Karelian Protocraton, the Belomorian Mobile Belt and the intervening junction zone. These are some of the principal Archaean crustal units in the ...
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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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(2003)The Palaeoproterozoic Kuetsjarvi Sedimentary Formation from the Pechenga Greenstone Belt, NW Russia, has been studied with the purpose of determining δ13Ccarb and δ18Ocarb values in various carbonate phases from genetically ...
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(2004)На базе сейсморазведки МОГТ вдоль профиля 4В (ФГУ НПП "Спецгеофизика", 1999 г.) и результатов геологических, геохимических и геохронологических исследований и изучения глубинных ксенолитов разработана модель строения ...
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(2004)Впервые на примере раннепалеопротерозойского (2.46-2.36 млрд. лет) коронитового (друзитового) комплекса Беломорья рассмотрены особенности геологии, петрологии и условий образования диспергированного (рассеянного) интрузивного ...
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(1993)Приводятся результаты исследований докембрийских образований Ханкайского (Россия) и Цзямусского (КНР) срединных массивов. Проведено возрастное расчленение докембрийских толщ и их сопоставление. Сделан вывод, что докембрий ...
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(2003)Нижнепротерозойские доломиты формаций Данфи, Портейдж, Олдер и У в, представляющие нижние горизонты надсерии Каниаписко, Лабрадорский трог Канадского щита, известны аномально высокими значениями 5 13С +5.3...+15.4‰ PDB. ...
Now showing items 41-60 of 71