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Eiler J.M.; Schauble E. (2004)

The chemistry and budgets of atmospheric gases are constrained by their bulk stable isotope compositions (e.g., δ13C values), which are based on mixing ratios of isotopologues containing one rare isotope (e.g., 16O13C16O). ...

18O/16O ratios in anhydrous spinel lherzolite xenoliths from the Shavaryn-Tsaram volcano, Mongolia

Kovalenko V.I.; Harmon R.S.; Kempton P.D.; Stosch H.G.; Hoefs J.; Eonov D. (1987)

Anhydrous spinel lherzolite xenoliths from the Shavaryn-Tsaram volcano, which represent unusually clinopyroxenerich samples of upper mantle beneath the Tariat Depression in north-central Mongolia, have particularly low ...

2-D SEISMIC TRENCHING OF COLLUVIAL WEDGES AND FAULTS

Sheley D.; Crosby T.; Zhou M.; Giacoma J.; Yu J.; He R.; Schuster G.T. (2003)

Images of the depth and shape of colluvial wedges by 3-D travel time tomography can be valuable in estimating the past history of ancient earthquakes and assessing the earthquake hazard of a fault. Unfortunately, 3-D seismic ...

2-D SHAPE PREFERRED ORIENTATIONS OF RIGID PARTICLES IN TRANSTENSIONAL VISCOUS FLOW

Marques F.O.; Coelho S. (2003)

studied the two-dimensional (2-D) rotational behaviour of individual rigid particles embedded in a viscous medium subject to simple shear and transpression (Sr>0), at low/medium shear strains. We now extend this theoretical ...

2-METHYLRETENE IN SEDIMENTARY MATERIAL: A NEW HIGHER PLANT BIOMARKER

Bastow T.P.; Singh R.K.; van Aarssen B.G.K.; Alexander R.; Kagi R.I. (2001)

2-Methylretene has been synthesised, characterised and identified in sedimentary material from a range of locations, source types and ages. 2-Methylretene was observed only in samples of Permian to Tertiary age and can be ...

2.8 GA BONINITE-HOSTING PARTIAL SUPRASUBDUCTION ZONE OPHIOLITE SEQUENCES FROM THE NORTH KARELIAN GREENSTONE BELT, NE BALTIC SHIELD, RUSSIA

Shchipansky A.A.; Babarina I.I.; Konilov A.N.; Krylov K.A.; Samsonov A.V.; Bogina M.M.; Bibikova E.V.; Slabunov A.I. (2004)

Neoarchean subduction-related assemblages of the North Karelian greenstone belt, in the NE part of the Baltic Shield, Russia, contain the world's oldest known boninite series, occurring in at least in two areas of the belt. ...

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 ...

21NE VERSUS 10BE AND 26AL EXPOSURE AGES OF FLUVIAL TERRACES: THE INFLUENCE OF CRUSTAL NE IN QUARTZ

Hetzel R.; Niedermann S.; Ivy-Ochs S.; Kubik P.W.; Tao M.; Gao B. (2002)

The accuracy of 21Ne surface exposure ages depends critically on the correction for a trapped Ne component. Commonly, the amount of cosmogenic Ne used to calculate 21Ne exposure ages is considered to be the Ne excess ...

226RA(EXCESS)/BA GROWTH RATES AND U-TH-RA-BA SYSTEMATIC OF BALTIC MN/FE CRUSTS

Liebetrau V.; Eisenhauer A.; Gussone N.; Worner G.; Hansen B.T.; Leipe T. (2002)

We analyzed 238U, 234U, 232Th, 230Th, and 226Ra by thermal ionization mass spectrometry (TIMS) and Ba by inductively coupled plasma optical emission spectrometry (ICP-OES) on eight Mn/Fe crusts from the Mecklenburg Bay (SW ...

226RAEXCESS/BA GROWTH RATES AND U-TH-RA-BA SYSTEMATIC OF BALTIC MN/FE CRUSTS

Liebetrau V.; Eisenhauer A.; Gussone N.; Worner G.; Hansen B.T.; Leipe T. (2002)

We analyzed 238U, 234U, 232Th, 230Th, and 226Ra by thermal ionization mass spectrometry (TIMS) and Ba by inductively coupled plasma optical emission spectrometry (ICP-OES) on eight Mn/Fe crusts from the Mecklenburg Bay (SW ...

234TH AND 7BE AS TRACERS FOR THE TRANSPORT AND DYNAMICS OF SUSPENDED PARTICLES IN A PARTIALLY MIXED ESTUARY - CHEMICAL PHASE PARTITIONING AND CYCLING ACROSS A SALINITY GRADIENT

Feng H.; Cochran J.K.; Hirschberg D.J. (1999)

The sources of the natural radionuclides 234Th (half-life = 24 d) and 7Be (half-life = 53 d) to the partially mixed Hudson River estuary are distinctly different: 234Th is produced from decay of dissolved 238U that varies ...

234U 238U MASS SPECTROMETRY OF CORALS: HOW ACCURATE IS THE UTH AGE OF THE LAST INTERGLACIAL PERIOD?

Hamelin B.; Bard E.; Zindler A.; Fairbanks R.G. (1991)

Direct measurement of U and Th by mass spectrometry recently provided a spectacular improvement in the precision of coral dating by the UTh disequilibrium method [1]. Mass spectrometric data also provide a much better ...

238U-234U AND 232TH-230TH IN THE BALTIC SEA AND IN RIVER WATER

Andersson P.S.; Wasserburg G.J.; Chen J.H.; Papanastassiou D.A.; Ingri J. (1995)

The concentration (C) of dissolved 238U, 234, 232Th and 230Th in fresh and brackish waters from the Baltic Sea were determined using TIMS. The brackish waters range in salinity from that of sea water (SW) to 2.5%%. C238U ...

23NA AND 133CS NMR STUDY OF CATION ADSORPTION ON MINERAL SURFACES: LOCAL ENVIRONMENTS, DYNAMICS, AND EFFECTS OF MIXED CATIONS

Kim Y.; Kirkpatrick R.J. (1997)

23Na and 133Cs MAS NMR methods were used to study the adsorption sites and atomic-scale dynamics of Cs, Na, and their mixtures on the surfaces of illite, kaolinite, boehmite, and silica gel reacted with 0.1 M NaCl and mixed ...

26MG EXCESS IN HIBONITES OF THE RUMURUTI CHONDRITE HUGHES 030

Bischoff A.; Srinivasan G. (2003)

The Rumuruti chondrites (R chondrites) constitute a new, well-established, chondrite group different from carbonaceous, ordinary, and enstatite chondrites. Most samples of this group are gas-rich regolith breccias showing ...

29SI AND 27AI MAS-NMR SPECTROSCOPY OF β-EUCRYPTITE (LIALSIO4): THE ENTHALPY OF SI,AL ORDERING

Phillips B.L.; Hongwu X.U.; Navrotsky A.; Heaney P.J. (2000)

By combining data from oxide melt solution calorimetry and 29Si MAS-NMR spectroscopy, the enthalpy for short-range Si.Al ordering in β-eucryptite (LiAlSiQ4) was determined for a series of samples prepared by glass annealing. ...

29SI AND 27AL MAS NMR STUDY OF THE ZEOLITIZATION OF KAOLIN BY ALKALI LEACHING

Benharrats N.; Belbachir M.; Legrand A.P.; D'Espinose de la Caillerie J.-B. (2003)

The alkali leaching of two aluminosilicates, kaolinite and metakaolinite, with aqueous NaOH has been studied. Both silicates gave hydroxysodalite (HS) with or without the evanescent zeolite NaA. X-ray diffraction and ...

29SI AND 27AL MAS-NMR SPECTROSCOPY OF GLASSES IN THE SYSTEM CASIO31BMGSIO31BAL2O3

Libourel G.; Geiger C.A.; Merwin L.; Sebald A. (1992)

29SI MAS NMR STUDY OF DIOPSIDE-CA-TSCHERMAK CLINOPYROXENES: DETECTING BOTH TETRAHEDRAL AND OCTAHEDRAL A1 SUBSTITUTION

Flemming R.L.; Luth R.W. (2002)

We have studied short-range cation ordering across the diopside (CaMgSi2O6)-Ca-Tschermak pyroxene (CaAl2SiO6) (Di-CaTs) solid solution in samples synthesized at 1400 °C and 2 GPa, for 24 hours. Peak positions in 29Si MAS ...

2D MODEL OF THE CRUST AND UPPERMOST MANTLE ALONG RIFT PROFILE, SIBERIAN CRATON

Pavlenkova G.A.; Priestley K.; Cipar J. (2002)

A two-dimensional model of the crust and uppermost mantle for the western Siberian craton and the adjoining areas of the Pur-Gedan basin to the north and Baikal Rift zone to the south is determined from travel time data ...

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