ECONOMIC GEOLOGY and the Bulletin of the Society of Economic Geologists, 2005, V 100, N 3, May.

On Hydrothermal Convection Systems and
the Emergence of Life
Michael J. Russell, Allan J. Hall, 
Adrian J. Boyce, and Anthony E. Fallick

Siderophile and Chalcophile Metal Variations
in Flood Basalts from the Siberian Trap, 
Noril'sk Region: Implications for the 
Origin of the Ni-Cu-PGE Sulfide Ores
Peter C. Lightfoot and Reid R. Keays

Geology and Genesis of the Multistage 
High-Sulfidation Epithermal Pascua Au-Ag-Cu 
Deposit, Chile and Argentina
Annick Chouinard, Anthony E. Williams-Jones, 
Robert W. Leonardson, C. Jay Hodgson, Pedro Silva, 
Carlos Tellez, Javier Vega, and Fernando Rojas

Porphyry Copper Deposits Density
Donald A. Singer, Vladimir I. Berger, 
W. David Menzie, and Byron B. Berger

Clay Alteration Associated with Proterozoic 
Unconformity-Type Uranium Deposits in the East 
Alligator Rivers Uranium Field, Northern Territory, 
D. Beaufort, P. Patrier, E. Laverret, 
P. Bruneton, and J. Mondy

Uranium deposits of the Mount Isa Region and 
Their Relationship to Deformation, Metamorphism
and Copper Deposition
Melissa J. Gregory, Andy R. Wilde, 
and Peter A. Jones

Numerical Heat and Fluid Flow Modeling of the 
Panorama Volcanic-Hosted Massive Sulfide District,
Western Australia
Christian Schardt, Jianwen Yang, and Ross Large

Scientific Communications

Relative and Absolute Timing of Gold Mineralization Along the Meliadine Trend, Nunavut, Canada: Evidence for Paleoproterozoic Gold Hosted in an Archean Greenstone Belt Robert L. Carpenter, Norman A. Duke, Hamish A. Sandeman, and Richard Stern Structural Controls on the Archean Troilus Gold-Copper Deposit, Quebec, Canada S. Goodman, A.E. Williams-Jones, and P. Carles Zinc Isotope Variation in Hydrothermal Systems: Preliminary Evidence from the Irish Midlands Orefield J. J. Wilkinson, D. J. Weiss, T. F. D. Mason, and B. J. Coles