Geochimica et Cosmochimica Acta, 2006, V 70, N 1, 1 January.

Cover 1 (TOC)  • 
Page CO1 

Editorial Board  • 
Page CO2 

Abundance of mass 47 CO2 in urban air, 
car exhaust, and human breath  • 
Hagit P. Affek and John M. Eiler
Pages 1-12 

Seasonal changes in stable carbon isotopic
composition of n-alkanes in the marine aerosols
from the western North Pacific: Implications
for the source and atmospheric transport  • 
James A. Bendle, Kimitaka Kawamura and Koji Yamazaki
Pages 13-26 

Zinc sorption to biogenic hexagonal-birnessite
ps within a hydrated bacterial biofilm  • 
Brandy Toner, Alain Manceau, 
Samuel M. Webb and Garrison Sposito
Pages 27-43 

Deprotonation energies of a model fulvic acid. 
I. Carboxylic acid groups  • 
Chad C. Trout and James D. Kubicki
Pages 44-55 

In vitro enzymatic reduction kinetics of 
mineral oxides by membrane fractions from 
Shewanella oneidensis MR-1  • 
Shane S. Ruebush, Gary A. Icopini, 
Susan L. Brantley and Ming Tien
Pages 56-70 

Time scale and conditions of weathering 
under tropical climate: Study of the 
Amazon basin with U-series  • 
A. Dosseto, B. Bourdon, J. Gaillardet, 
C.J. Allegre and N. Filizola
Pages 71-89 

Tropical Atlantic SST history inferred 
from Ca isotope thermometry over the last 140ka  • 
Dorothee Hippler, Anton Eisenhauer 
and Thomas F. Nagler
Pages 90-100 

Alkenone paleothermometry: Biological lessons
from marine sediment records off western South America  • 
Fredrick G. Prahl, Alan C. Mix and Margaret A. Sparrow
Pages 101-117 

Iron isotopes in natural carbonate minerals 
determined by MC-ICP-MS with a 58Fe–54Fe double spike  • 
K. Dideriksen, J.A. Baker and S.L.S. Stipp
Pages 118-132 

Microbial contributions to N-immobilization 
and organic matter preservation in 
decaying plant detritus  • 
Luc Tremblay and Ronald Benner
Pages 133-146 

Comparing the activity of aluminum in two 
B horizons developed from volcanic ash 
deposits in Japan, dominated by short-range 
ordered aluminosilicates and crystalline 
clay minerals, respectively  • 
Yasumi Yagasaki, Jan Mulder and Masanori Okazaki
Pages 147-163 

High-precision 142Nd/144Nd measurements in 
terrestrial rocks: Constraints on the early 
differentiation of the Earth’s mantle  • 
Guillaume Caro, Bernard Bourdon, 
Jean-Louis Birck and Stephen Moorbath
Pages 164-191 

Layered mantle structure beneath the western 
Guyana Shield, Venezuela: Evidence from 
diamonds and xenocrysts in Guaniamo kimberlites  • 
Daniel J. Schulze, Dante Canil, 
Dominic M.DeR. Channer and Felix V. Kaminsky
Pages 192-205 

Vapor pressures and evaporation coefficients 
for melts of ferromagnesian chondrule-like compositions  • 
A.V. Fedkin, L. Grossman and M.S. Ghiorso
Pages 206-223 

Li and B isotopic variations in an Allende CAI: 
Evidence for the in situ decay of short-lived 
10Be and for the possible presence of the 
short-lived nuclide 7Be in the early solar system  • 
Marc Chaussidon, Francois Robert and Kevin D. McKeegan
Pages 224-245 

Petrology and geochemistry of LaPaz Icefield 02205: 
A new unique low-Ti mare-basalt meteorite  • 
Mahesh Anand, Lawrence A. Taylor, Christine Floss, 
Clive R. Neal, Kentaro Terada and Shiho Tanikawa
Pages 246-264 

Book review  •
Christian Koeberl
Pages 265-266 

Cover 4 (TOC continued and Barcode)  • 
Page CO4