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Browsing by Subject "Palaeoproterozoic"

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2000-MA SULPHIDE CONCRETIONS FROM THE 'PRODUCTIVE' FORMATION OF THE PECHENGA GREENSTONE BELT, NW RUSSIA: GENETIC HISTORY BASED ON MORPHOLOGICAL AND ISOTOPIC EVIDENCE

Melezhik V.A.; Grinenko L.N.; Fallick A.E. (1998)

Two hundred and fifty-nine sulphide samples from black shales of the 'Productive' Formation belonging to the Palaeoproterozoic (2000 Ma) Petsamo Supergroup in the Kola region (NW Russia) have been analysed for their sulphur ...
A 2.44 GA SYN-TECTONIC MAFIC DYKE SWARM IN THE KOLVITSA BELT, KOLA PENINSULA, RUSSIA: IMPLICATIONS FOR EARLY PALAEOPROTEROZOIC TECTONICS IN THE NORTH-EASTERN FENNOSCANDIAN SHIELD

Balagansky V.V.; Timmerman M.J.; Kozlova N.Ye.; Kislitsyn R.V. (2001)

The Kolvitsa Belt in the south-western Kola Peninsula formed coeval with the earliest Palaeoproterozoic rift-belts in the Fennoscandian Shield. The Palaeoproterozoic history of this belt comprises the deposition of the ...
AGE, EVOLUTION AND REGIONAL SETTING OF THE PALAEOPROTEROZOIC UMBA IGNEOUS SUITE IN THE KOLVITSA-UMBA ZONE, KOLA PENINSULA: CONSTRAINTS FROM NEW GEOLOGICAL, GEOCHEMICAL AND U-PB ZIRCON DATA

Glebovitsky V.; Alexejev N.; Sedova I.; Salnikova E.; Berezhnaya N.; Marker M.; Bridgwater D. (2001)

The Umba igneous complex consists of an enderbite–charnockite suite, including porphyritic variety of charnockites, and a porphyritic granite. Both are intruded by irregular veins or minor bodies of later reddish granite. ...
EXTREME 13CCARB ENRICHMENT IN CA. 2.0 GA MAGNESITE-STROMATOLITE-DOLOMITE-'RED BEDS' ASSOCIATION IN A GLOBAL CONTEXT: A CASE FOR THE WORLD-WIDE SIGNAL ENHANCED BY A LOCAL ENVIRONMENT

Melezhik V.A.; Fallick A.E.; Medvedev P.V.; Makarikhin V.V. (1999)

The Palaeoproterozoic positive excursion of δ 13Ccarb is now considered as three positive shifts of δ 13Ccarb separated by returns to 0‰, which all occurred between 2.40 and 2.06 Ma. This isotopic event is unique in terms ...
FRACTAL PROPERTIES OF MULTI-ORDER FOLDING AS A TOOL FOR EXPLORATION OF LOW-GRADE BANDED IRON ORES IN THE KRIVOY ROG BASIN (UKRAINE)

Kulik D.A.; Chernovsky M.I. (1996)

The low-grade Palaeoproterozoic stratabound banded iron ores of the Krivoy Rog basin (Ukraine) underwent strong tectonometamorphic deformation into superimposed folds of several orders, with amplitudes from centimetres to ...
FRACTIONATION OF CARBON AND OXYGEN ISOTOPES IN 13C-RICH PALAEOPROTEROZOIC DOLOSTONES IN THE TRANSITION FROM MEDIUM-GRADE TO HIGH-GRADE GREENSCHIST FACIES: A CASE STUDY FROM THE KOLA SUPERDEEP DRILLHOLE

Melezhik V.A.; Fallick A.E.; Smirnov Yu.P.; Yakovlev Yu.N. (2003)

Samples from the Kola Superdeep Drillhole (12 262 m), a deep drillhole (1060 m), and from the surface, seaprated by only around 10 km, provided a unique opportunity for direct tracing of delta13C and delta18O changes through ...
GARNET GRANULITE XENOLITHS FROM THE NORTHERN BALTIC SHIELD- THE UNDERPLATED LOWER CRUST OF A PALAEOPROTEROZOIC LARGE IGNEOUS PROVINCE

Kempton P.D.; Downes H.; Neymark L.A.; Wartho J.A.; Zartman R.E.; Sharkov E.V. (2001)

Garnet granulite facies xenoliths hosted in Devonian lamprophyres from the Kola Peninsula are interpreted to represent the high-grade metamorphic equivalents of continental flood tholeiites, emplaced into the Baltic Shield ...
ISOTOPIC EVIDENCE FOR PALAEOPROTEROZOIC ACCRETION IN THE BASEMENT OF THE EAST EUROPEAN CRATON

Claesson S.; Bogdanova S.V.; Gorbatschev R.; Bibikova E.V. (2001)
KARELIAN SHUNGITE-AN INDICATION OF 2.0-GA-OLD METAMORPHOSED OIL-SHALE AND GENERATION OF PETROLEUM: GEOLOGY, LITHOLOGY AND GEOCHEMISTRY

Melezhik V.A.; Fallick A.E.; Filippov M.M.; Larsen O. (1999)

The ca. 2.0-Ga-old, 600-m-thick upper Zaonezhskaya Formation near Lake Onega, NW Russia, contains unusually high concentrations of Corg (up to 98%), averaging around 25%. The formation contains an estimated 25×1010 tonnes ...
PALAEOPROTEROZOIC MAGNESITE: LITHOLOGICAL AND ISOTOPIC EVIDENCE FOR PLAYA/SABKHA ENVIRONMENTS

Melezhik V.A.; Fallick A.E.; Medvedev P.V.; Makarikhin V.V. (2001)

Magnesite forms a series of 1- to 15-m-thick beds within the ≈2·0 Ga (Palaeoproterozoic) Tulomozerskaya Formation, NW Fennoscandian Shield, Russia. Drillcore material together with natural exposures reveal that the 680-m-thick ...
PROVENANCE AND TECTONIC IMPLICATIONS OF PALAEOPROTEROZOIC (C. 1740 MA) QUARTZ PORPHYRY CLASTS IN THE BASAL OLD RED SANDSTONE (LILLJEBORGFJELLET CONGLOMERATE FORMATION) OF NORTHWESTERN SVALBARD'S CALEDONIDES

Hellman F.J.; Gee D.G.; Gjelsvik T.; Tebenkov A.M. (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 ...
SUBAERIAL EXPOSURE SURFACES IN A PALAEOPROTEROZOIC 13C-RICH DOLOSTONE SEQUENCE FROM THE PECHENGA GREENSTONE BELT: PALAEOENVIRONMENTAL AND ISOTOPIC IMPLICATIONS FOR THE 2330-2060 MA GLOBAL ISOTOPE EXCURSION OF 13C/12C

Melezhik V.A.; Fallick A.E.; Grillo S.M. (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 ...
SULPHIDE SEGREGATION IN FERROPICRITES FROM THE PECHENGA COMPLEX, KOLA PENINSULA, RUSSIA

Brügmann G.E.; Hanski E.J.; Naldrett A.J.; Smolkin V.F. (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. ...
THE 1.80-1.74-GA GABBRO-ANORTHOSITE-RAPAKIVI KOROSTEN PLUTON IN THE UKRAINIAN SHIELD: A 3-D GEOPHYSICAL RECONSTRUCTION OF DEEP STRUCTURE

Bogdanova S.V.; Pashkevich I.K.; Buryanov V.B.; Makarenko I.B.; Orlyuk M.I.; Starostenko V.I.; Legostaeva O.V.; Skobelev V.M. (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 ...
Геофизические неоднородности Кейвского блока и их геологическая природа

Филатова Валентина Тимофеевна; Петров Валентин Петрович (Федеральное государственное бюджетное учреждение науки Кольский научный центр Российской академии наук, 2015)

Для оценки влияния тектонических режимов и характера метаморфических процессов на вещественный состав, строение и промышленную значимость месторождений полезных ископаемых Кейвского блока определена структура геофизических ...

Browsing by Subject "Palaeoproterozoic"

Browsing by Subject "Palaeoproterozoic"

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