GEOCHIMICA ET COSMOCHIMICA ACTA, 1997, V61, N 22, November.

pp. 4707-4721
Composition dependence of the activity of nickel in silicate
melts
W. Ertel, D. B. Dingwell, and H. St.C. O'Neil

pp. 4723-4744
Geochemical characteristics of aluminum-depleted and
undepleted komatiites and HREE-enriched low-Ti tholeiites,
western Abitibi greenstone belt: A heterogenous mantle plume
-convergent margin environment
J. Fan and R. Kerrich

pp. 4745-4760
Rare earth elements in apatite: Uptake from H2O-bearing
phosphate-fluoride melts and the role of volatile components
M. E. Fleet and Y. Pan

pp. 4761-4767
Carbon kinetic isotope effect accompanying microbial
oxidation of methane in boreal forest soils
W. S. Reeburgh, A. I. Hirsch, F. J. Sansone, B. N. Popp,
and T. M. Rust  

pp. 4769-4788
Sulfur-binding in recent environments: II. Speciation of
sulfur and iron and implications for the occurrence of 
organo-sulfur compounds
W. A. Hartgers, J. F. Lòpez, J. S. S. Damsté, C. Reiss,
J. R. Maxwell, and J. O. Grimalt

pp. 4789-4797
The correlation between the Uk37 index and sea surface
tempertures in the warm boundary: The South China Sea
C. Pelejero and J. O. Grimalt

pp. 4799-4807
Applications of the 190Pt-186Os isotope system to
geochemistry and cosmochemistry
R. J. Walker, J. W. Morgan, E. S. Beary, M. I. Smoliar,
G. K. Czamanske, and M. F. Horan


pp. 4809-4829
Isotopic and geochemical evidence for crust-mantle
interaction during late Archaean crustal growth
M. Berger and H. Rollinson

pp. 4831-4846
Carbon isotope ratios of Phanerozoic marine cements:
Re-evaluating the global carbon and sulfur systems
S. J. Carpenter and K. C. Lohmann

pp. 4847-4854
Precise and accurate neodymium isotopic measurements by
plasma-source mass spectrometry
B. Luais, P. Telouk, and F. Albarède

pp. 4855-4884
238Th-230U disequilibria, magma petrogenesis, and flux rates
beneath the depleted Tonga-Kermadec island arc
S. Turner, C. Hawkesworth, N. Rogers, J. Bartlett,
T. Worthington, J. Hergt, J. Pearce, and I. Smith

pp. 4885-4893
Influence of Allende minerals on deuterium retention of
products of the Strecker synthesis
N. R. Lerner

pp. 4895-4914
Compositional continuity of enstatite chondrites and
implications for heterogeneous accretion of the enstatite
chondrite parent body
P. Kong, T. Mori, and M. Ebihara

pp. 4915-4931
Constraints on Martian differentiation processes from Rb-Sr
and Sm-Nd isotopic analyses of the basaltic shergottite QUE
94201
L. E. Borg, L. E. Nyquist, L. A. Taylor, H. Wiesmann,
and C.-Y. Shih  

GEOCHIMICA ET COSMOCHIMICA ACTA, 1997, V61, N23, December.

pp. 4935-4943
Introduction to the theory of forced equilibria: General 
principles, basic concepts and definitions
V. L. Tauson and V. V. Akimov

pp. 4945-4954
Oxidation kinetics of manganese(II) in seawater at 
nanomolar concentrations
P. J. von Langen, K. S. Johnson, K. H. Coale,
and V. A. Elrod

pp. 4955-4964
Experimental determination and interpretation of the 
solubility of corundum in H2O between 350 and 600 C from 
0.5 to 2.2 kbar
J. V. Walther


pp. 4965-4973
Rate of water exchange between Al(C2O4)(H2O)4+(aq) complexes
and aqueous solutions determined by 17O-NMR spectroscopy
B. L. Phillips, S. N. Crawford, and W. H. Casey

pp. 4975-4981
Low  18O magma, Isle of Skye, Scotland: Evidence from zircons
C. E. Gilliam and J. W. Valley

pp. 4983-4991
Controls on carbon isotope fractionation by diatoms in the
Peru upwelling region
R. D. Pancost, K. H. Freeman, S. G. Wakeham,
and C. Y. Robertson

pp. 4993-5003
Gaseous, liquid, and supercritical H2O and CO2: Oxygen
isotope behavior
J. M. Rosenbaum

pp. 5005-5022
Dating scheelite stages: A strontium, neodymium, and lead 
approach from the Felbertal tungsten deposit, Central Alps,
Austria
R. Eichhorn, R. Hoell, E. Jagoutz, and U. Schaerer
 
pp. 5023-5041
Isotopic evidence for the paleoenvironmental evolution of
the Mesoproterozoic Helena Formation, Belt Supergroup,
Montana, USA
T. D. Frank, T. W. Lyons, and K. C Lohmann

pp. 5043-5050
Intermittent denitrification: The application of a 15N 
natural abundance method to a forested ecosystem
K. Koba, N. Tokuchi, E. Wada, T. Nakajima, and G. Iwatsubo  

pp. 5051-5056
Fractionation of  silicon isotopes by marine diatoms during
biogenic silica formation
C. L. De La Rocha, M. A. Brzezinski, and M. J. DeNiro

pp. 5057
Ion microprobe study of oxygen isotopic compositions of
structurally nonequivalent growth surfaces on synthetic
calcite
R. J. Reeder, J. W. Valley, C. M. Graham, and J. M. Eiler

pp. 5065-5088
Noble gases, their carrier phases, and argon chronology of
upper mantle rocks from Zabargad Island, Red Sea
M. Trieloff, H. W. Weber, G. Kurat, E. K. Jessberger,
and J. Janicke  

pp. 5089-5097
Subsolidus REE partitioning between pyroxene and plagioclase
in cumulate eucrites: An ion microprobe investigation
A. Pun, J. J. Papike, and G. D. Layne

pp. 5099-5115
CM chondrites exhibit the complete petrologic range from 
type 2 to 1
M. E. Zolensky, D. W. Mittlefehldt, M. E. Lipschutz,
M.-S. Wang, R. N. Clayton, T. K. Mayeda, M. M. Grady,
C. Pillinger, and D. Barber

pp. 5117-5146
Isotopic systematics of presolar silicon carbide from the 
Orgueil (CI) chondrite: Implications for Solar System
formation and stellar nucleosynthesis
G. R. Huss, I. D. Hutcheon, and G. J. Wasserburg

pp. 5147-5160
The textures and compositions of fine-grained Antarctic
micrometeorites: Implications for comparisons with meteorites
M. J. Grenge, M. M. Grady, and R. Hutchison

GEOCHIMICA ET COSMOCHIMICA ACTA, 1997, V61, N24, December

pp. 5165-5186
An experimental study of kaolinite dissolution and
precipitation kinetics as a function of chemical affinity
and solution composition at 150 C, 40 bars,  and pH 2, 6.8,
and 7.8
J.-L. Devidal, J. Schott, and J.-L. Dandurand

pp. 5187-5198
A spectrophotometric study of hydrogen sulphide ionisation
in aqueous solutions to 350 C
O. M. Suleimenov and T. M. Seward

pp. 5199-5208
23Na and 133Cs NMR study of cation adsorption on mineral
surfaces: Local environments, dynamics, and effects of mixed
cations
Y. Kim and R. J. Kirkpatrick

pp. 5209-5219
Quantifying fluid flow, solute mixing, and biogeochemical
turnover at cold vents of the eastern Aleutian subduction
zone
K. Wallmann, P. Linke, E. Suess, G. Bohrmann, H. Sahling,
M. Schlüter, A. Daehlmann, S. Lammers, J. Greinert,
and N. von Mirbach

pp. 5221-5231
Weathering histories of Chinese loess deposits based on
uranium and thorium series nuclides and cosmogenic 10Be
Z. Y. Gu, D. Lal, T. S. Liu, Z. T. Guo, J. Southon,
and M. W. Caffee

pp. 5233-5253
Speciation and cycling of trace metals in Esthwaite Water:
A productive English lake with seasonal deep-water anoxia
E. P. Achterberg, C. M. G van den Berg, M. Boussemart, and
W. Davison

pp. 5255-5277
The influence of sulfur and partitioning of siderophile
elements
D. Jana and D. Walker

pp.  5279-5293
Gibbs free energies of formation of RuO2, IrO2, and OsO2:
A high-temperature electrochemical and calorimetric study
H. St.C. O'Neill and J. Nell

pp. 5295-5312
Diffusion in silicate melts: III. Empirical models for
multicomponent diffusion
Y. Liang, F. M. Richter, and L. Chamberlin

pp. 5313-5324
Adsorption of (poly)maleic acid and an aquatic fulvic acid
by goethite
L. Wang, Y.-P. Chin, and S. J. Traina

pp. 5325-5333
Comparison of isoleucine epimerization and leaching
potential in the molluskan genera Astarte, Macoma, and Mya
S. Roof

pp. 5335-5345
Carbazole distributions in carbonate and clastic source
rocks
H. Clegg, H. Wilkes, and B. Horsfield

pp. 5347-5350
The catalytic decomposition of petroleum into natural gas
F. D. Mango and J. Hightower

pp. 5351-5361
Sulfur isotope fractionation during bacterial sulfate
reduction in organic-rich sediments
K. S. Habicht and D. E. Canfield

pp. 5363-5369
Molecular indicators of diagenetic status in marine organic
matter
S. G. Wakeham, C. Lee, J. I. Hedges, P. J. Hernes,
and M. L. Peterson

pp. 5371-5377
An evaluation of low-temperature apatite U-Th/He
thermochronometry method
A. C. Warnock, P. K. Zeitler, R. A. Wolf, and S. C. Bergman

pp. 5379-5389
Carbon isotopic fractionation associated with lipid
biosynthesis by a cyanobacterium: Relevance for 
interpretation of biomarker records
S. Sakata, J. M. Hayes, A. R. McTaggart, R. A. Evans,
K. J. Leckrone, and R. K. Togasaki

pp. 5391-5409
An isotopic biogeochemical study of Neoproterozoic and Early
Cambrian sediments from the Centralian superbasin, Australia
G. A. Logan, R. E. Summons, and J. M. Hayes

pp. 5411-5416
Osmium in the rivers
M. Sharma and G. J. Wasserburg

pp. 5417-5428
Nitrogen and heavy noble gases in ALH84001: Signatures of
ancient Martian atmosphere
S. V. S. Murty and R. K. Mohapatra