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15N NMR STUDY OF NITRATE ION STRUCTURE AND DYNAMICS IN HYDROTALCITE-LIKE COMPOUNDS

Hou X.; Kirkpatrick James R.; Yu P.; Moore D.; Kim Y. (2000)

We report here the first nuclear magnetic resonance (NMR) spectroscopic study of the dynamical and structural behavior of nitrate on the surface and in the interlayer of hydrotalcite-like compounds (15NO3--HT). Spectroscopically ...
16O ENRICHMENTS IN ALUMINUM-RICH CHONDRULES FROM ORDINARY CHONDRITES

Russell S.S.; MacPherson G.J.; Leshin L.A.; McKeegan K.D. (2000)

The oxygen isotopic compositions of seven Al-rich chondrules from four unequilibrated ordinary chondrites were measured in situ using an ion microprobe. On an oxygen three isotope plot, the data are continuous with the ...
16O-RICH MELILITE IN CO3.0 CHONDRITES: POSSIBLE FORMATION OF COMMON, 16O-POOR MELILITE BY AQUEOUS ALTERATION

Wasson J.T.; Yurimoto H.; Russell S.S. (2001)

A problem of long-standing is the origin of the high Δ17O (= δ17O - 0.52 . δ18O) values of melilite in the refractory inclusions of carbonaceous chondrites. The spinel and, usually, also the diopside in the inclusions have ...
17,21-SECOHOPANOIC ACIDS, 25-NORHOPANOIC ACIDS, AND 28-NORHOPANOIC ACIDS IN SOURCE ROCKS AND CRUDE OILS

Pan X.; Philp R.P. (2006)

The presence of three families of hopanoic acids, 17,21-secohopanoic acids, 25-norhopanoic acids, and 28-norhopanoic acids, is discussed. Oils from West Siberia and tar balls from the Seychelles Islands were found to contain ...
17α,21α(H)-HOPANES: NATURAL AND SYNTHETIC

Nytoft H.P.; Bojesen-Koefoed J.A. (2001)

17α,21α(H)-hopanes are found in low concentrations in sediments and oils, but C30 17α,21α(H)-hopane is the only member of the series which can be detected in the m/z 191 mass chromatogram. The ratio of C30 17α,21α(H)-hopane ...
182HF-182W SYSTEMATICS IN EUCRITES: THE PUZZLE OF IRON SEGREGATION IN THE EARLY SOLAR SYSTEM

Quitte G.; Birck J.L.; Allegre C.J. (2000)

Eucrites are the witnesses of an early magmatic activity in small planetary bodies. Iron meteorites also testify to an early differentiation in planetesimals. Are basaltic magmatism and iron segregation related to each ...
182W AND 187RE-187OS SYSTEMATICS OF IRON METEORITES: CHRONOLOGY FOR MELTING, DIFFERENTIATION, AND CRYSTALLIZATION IN ASTEROIDS - IV. IRON WITH GERMANIUM CONCENTRATIONS GREATER THAN 190 PPM AND OTHER METEORITES ASSOCIATED WITH GROUP 1

Horan M.F.; Smoliar M.I.; Walker R.J. (1998)

W isotopic compositions (measured by N-TIMS) in five iron meteorite groups are used in conjunction with 187Re-187Os isotopic data to constrain the timing of metal segregation and crystallization, respectively, in the iron ...
187 OS-ENRICHED DOMAIN IN AN ARCHEAN MANTLE PLUME: EVIDENCE FROM 2.8 GA KOMATIITES OF THE KOSTOMUKSHA GREENSTONE BELT, NW BALTIC SHIELD

Puchtel I.S.; Brügmann G.E.; Hofmann A.W. (2001)

The Re–Os data on Archean komatiites from the Kostomuksha greenstone belt in the Baltic Shield are presented. This greenstone belt has been previously interpreted to represent a former oceanic plateau formed by the emplacement ...
18O 13C 16O IN EARTH’S ATMOSPHERE

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 ...
1983–2003 DECAYING RATE OF DEFLATION AT ASKJA CALDERA: PRESSURE DECREASE IN AN EXTENSIVE MAGMA PLUMBING SYSTEM AT A SPREADING PLATE BOUNDARY

Sturkell E.; Sigmundsson F.; Slunga R. (2006)

New deformation data from the Askja volcano, Iceland, show that the volcano's caldera has been deflating continuously for over 20 years, and confirm that the rate of subsidence is slowing down. The decay in subsidence rate ...
1: SUBDUCTION, SLAB DETACHMENT AND MINERALIZATION: THE NEOGENE IN THE APUSENI MOUNTAINS AND CARPATHIANS

Neubauer F.; Lips A.; Kouzmanov K.; Ivǎşcanu P.; Lexa J. (2005)

The Inner Carpathians comprise several distinct Neogene late-stage orogenic Pb-Zn-Cu-Ag-Au ore districts. The mineral deposits in these districts are closely related to volcanic and subvolcanic rocks, and represent mainly ...
2-D AND 3-D MODELLING OF WIDE-ANGLE SEISMIC DATA: AN EXAMPLE FROM THE VøRING VOLCANIC PASSIVE MARGIN

Rouzo S.; Klingelhöfer F.; Jonquet-kolstø H.; Karpuz R.; Kravik K.; Mjelde R.; Murai Y.; Raum T.; Shimamura H.; Williamson P.; Géli L. (2006)

This study presents the modelling of 2-D and 3-D wide-angle seismic data acquired on the complex, volcanic passive margin of the Vøring Plateau, off Norway. Three wide-angle seismic profiles were shot and recorded ...
2-D SEISMIC TOMOGRAPHIC AND RAY TRACING MODELLING OF THE CRUSTAL STRUCTURE ACROSS THE SUDETES MOUNTAINS BASING ON SUDETES 2003 EXPERIMENT DATA

Majdański M.; Grad M.; Guterch A.; Behm M.; Bodoky T.; Brinkmann R.; Brož M.; Brueckl E.; Czuba W.; Fancsik T.; Forkmann B.; Fort M.; Gaczyński E.; Geissler W.H.; Greschke R.; Harder S.; Hegedus E.; Hemmann A.; Hrubcová P.; Janik T.et al. (2006)

The seismic data obtained during SUDETES 2003 experiment are analysed, and detailed crustal structure for profiles S02, S03 and S06 is presented using three different 2-D techniques: (1) "smooth" tomography of refracted ...
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 ...
2.5D RESISTIVITY MODELING OF EMBANKMENT DAMS TO ASSESS INFLUENCE FROM GEOMETRY AND MATERIAL PROPERTIES

Sjödahl P.; Dahlin T.; Zhou B. (2006)

Repeated resistivity measurement is a potentially powerful method for monitoring development of internal erosion and anomalous seepage in earth embankment dams. This study is part of a project to improve current longterm ...
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 ...

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