Browsing ELibrary by Author "Fallick A.E."

Now showing items 1-14 of 14

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 ...
CHEMOSTRATIGRAPHY OF NEOPROTEROZOIC CARBONATES: IMPLICATIONS FOR 'BLIND DATING'

Melezhik V.A.; Gorokhov I.M.; Kuznetsov A.B.; Fallick A.E. (2001)
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 ...
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 ...
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 Y.P.; Yakovlev Y.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 delta(13)C and delta(18)O changes ...
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 ...
LASER COMBUSTION ANALYSIS OF δ34S OF SULFOSALT MINERALS - DETERMINATION OF THE FRACTIONATION SYSTEMATICS AND SOME CRYSTAL-CHEMICAL CONSIDERATIONS

Wagner T.; Boyce A.J.; Fallick A.E. (2002)

Laser sulfur combustion in the presence of O2 is the most commonly used method of in situ sulfur isotope analysis. Previous workers indicated that a small but reproducible fractionation of 34S/32S exists between the product ...
LASER MICROPROBE SULPHUR ISOTOPE ANALYSIS OF ARSENOPYRITE: EXPERIMENTAL CALIBRATION AND APPLICATION TO THE BOLIDEN AU-CU-AS MASSIVE SULPHIDE DEPOSIT

Wagner T.; Boyce A.J.; Fallick A.E.; Jonsson E. (2004)

Metamorphic remobilization of arsenopyrite-rich ores is a globally important process which can lead to significant concentrations of gold. In order to understand this and related processes, relations of sulphur isotopes ...
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 ...
PALAEOPROTEROZOIC TRAVERTINES OF VOLCANIC AFFILIATION FROM A 13C-RICH RIFT LAKE ENVIRONMENT

Melezhik V.A.; Fallick A.E. (2001)

The ca. 2.2 Ga Kuetsjarvi Sedimentary Formation (KSF) of the Pechenga Greenstone Belt, the north-east Fennoscandian Shield, contains the oldest travertines so far reported in the literature. The travertine-hosting succession ...
RB-SR CLOSURE TEMPERATURES IN BI-MINERALIC ROCKS: A MODE EFFECT AND TEST FOR DIFFERENT DIFFUSION MODELS

Jenkin G.R.T.; Rogers G.; Fallick A.E.; Farrow C.M. (1995)

Various diffusion models can be applied to Rb-Sr systems in cooling rocks. It is argued that a closed-system diffusion-controlled model, involving local equilibrium along grain boundaries, is most appropriate for describing ...
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 ...
THE GLOBAL INFLUENCE OF THE HYDROGEN IOSTOPE COMPOSITION OF WATER ON THAT OF BACTERIOGENIC METHANE FROM SHALLOW FRESHWATER ENVIRONMENTS - CO2 REDUCTION VS. ACETATE FERMENTATION-ISOTOPE EVIDENCE

Waldron S.; Lansdown J.M.; Scott E.M.; Fallick A.E.; Hall A.J. (1999)

We propose that the hydrogen isotope composition of recently produced microbial methane, δD(CH4), in sulfate-poor, shallow freshwater environments, is directly related to the hydrogen isotopic composition of the system ...
δ13C AND δ18O VARIATIONS IN PRIMARY AND SECONDARY CARBONATE PHASES: SEVERAL CONTRASTING EXAMPLES FROM PALAEOPROTEROZOIC 13C-RICH METAMORPHOSED DOLOSTONES

Melezhik V.A.; Fallick A.E. (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 ...

Browsing ELibrary by Author "Fallick A.E."

Browsing ELibrary by Author "Fallick A.E."

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