Geochimica et Cosmochimica Acta, 2002, V 66, N 14, 15 July.

 Thom Rahn, Nami Kitchen and John Eiler 
D/H ratios of atmospheric H2 in urban air: results using new methods for 
analysis of nano-molar H2 samples 
2475-2481

Chris J. Ballentine and Barbara Sherwood Lollar 
Regional groundwater focusing of nitrogen and noble gases into the Hugoton-
Panhandle giant gas field, USA 
2483-2497

Giles M. Marion 
A molal-based model for strong acid chemistry at low temperatures (<200 to 298K) 
2499-2516
  
 S. Emmanuel and Y. Erel 
Implications from concentrations and isotopic data for Pb partitioning processes 
in soils 
2517-2527
  
 Francisco Javier Mojica Prieto and Frank J. Millero 
The values of pK1 + pK2 for the dissociation of carbonic acid in seawater 
2529-2540
  
 Kate Wright, Randall T. Cygan and Ben Slater 
Impurities and nonstoichiometry in the bulk and on the (104) surface of dolomite 
2541-2546
  
 Bruno Deflandre, Alfonso Mucci, Jean-Pierre Gagn?, Constance Guignard and B.j?rn Sundby 
Early diagenetic processes in coastal marine sediments disturbed by a 
catastrophic sedimentation event 
2547-2558
  
 Suvasis Dixit and Philippe Van Cappellen 
Surface chemistry and reactivity of biogenic silica 
2559-2568
  
 N. Fagel, C. Innocent, C. Gariepy and C. Hillaire-Marcel 
Sources of Labrador Sea sediments since the last glacial maximum inferred from 
Nd-Pb isotopes 
2569-2581
  
 Laurent Trotignon et al. 
Laboratory simulation of an oxidizing perturbation in a deep granite environment 
2583-2601
  
 Ilya V. Veksler, Alexander M. Dorfman, Donald B. Dingwell and Nikolay Zotov 
Element partitioning between immiscible borosilicate liquids: A high-temperature 
centrifuge study 
2603-2614
  
 Victoria C. Bennett, Allen P. Nutman and Tezer M. Esat 
Constraints on mantle evolution from 187Os/188Os isotopic compositions of 
Archean ultramafic rocks from southern West Greenland (3.8 Ga) and Western 
Australia (3.46 Ga) 
2615-2630

Discussion 

 G. Dreibus and H. W?nke 
Comment on: "Comparative geochemistry of basalts from the Moon, Earth, HED 
asteroid, and Mars: Implication for the origin of the Moon," by A. Ruzicka, G. 
A. Snyder, and L. A. Taylor (2001) Geochim.Cosmochim. Acta, 65, 979-997 
2631-2632

Discussion 
 Alex Ruzicka, Gregory A. Snyder and Lawrence A. Taylor 
Response to the comment by G. Dreibus and H. W?nke on "Comparative geochemistry 
of basalts from the Moon, Earth, HED asteroid, and Mars: Implications for the 
origin of the Moon" (2001) Geochim.Cosmochim. Acta 65, 979-997 
2633-2635

Erratum 

 John S. Roden 
Errata to John S. Roden, Guanghui Lin, and James R. Ehleringer (2002) Response 
to the comment of V. J. Terwilliger on "A mechanistic model for interpretation 
of hydrogen and oxygen isotope ratios in tree-ring
cellulose", Geochim. Cosmochim. Acta 64, 21-35; Geochim. Cosmochim. Acta 66, 733-734. 
2637