ECONOMIC GEOLOGY
and the
Bulletin of the Society of Economic Geologists
Volume 103 May 2008 Number 3

Express Letter

Precise Age of the Platiniferous Merensky Reef, Bushveld Complex, South Africa, by the U-Pb Zircon Chemical Abrasion ID-TIMS Technique
J. S. Scoates and R. M. Friedman


Regular Papers

Hydrothermal Evolution of the Porphyry Copper Deposit at La Caridad, Sonora, Mexico, and the Relationship with a Neighboring High-Sulfidation Epithermal Deposit
V. A. Valencia, C. Eastoe, J. Ruiz, L. Ochoa-Landin, G. Gehrels, C. González-Leon, F. Barra, and E. Espinoza

Mineral Zoning and Geochemistry of Epithermal Polymetallic Zn-Pb-Ag-Cu-Bi Mineralization at Cerro de Pasco, Peru
R. Baumgartner, L. Fontboté, and T. Vennemann

Synthetic Fluid Inclusions. XVII. PVTX Properties of High-Salinity H2O-NaCl Solutions (>30 wt.% NaCl): Application to Fluid Inclusions that Homogenize by Halite Disappearance from Porphyry Copper and Other Hydrothermal Ore Deposits
S. P. Becker, A. Fall, and R. J. Bodnar

Post-Orogenic Origin of the Stratiform Cu Mineralization at Lufukwe, Lufilian Foreland, Democratic Republic of Congo
H. A. El Desouky, P. Muchez, S. Dewaele, A. Boutwood, and R. Tyler

Uranium Metallogenesis in South China and Its Relationship to Crustal Extension during the Cretaceous to Tertiary
R. Hu, X. Bi, M-F. Zhou, J. Peng, W. Su, S. Liu, and H. Qi

Bimodal Distribution of Gold in Pyrite and Arsenopyrite: Examples from the Archean Boorara and Bardoc Shear Systems, Yilgarn Craton, Western Australia
A. A. Morey, A. G. Tomkins, F. P. Bierlein, R. F. Weinberg, and G. J. Davidson

Revisiting the Cumulative Grade-Tonnage Relationship for Major Copper Ore Types
M. D. Gerst


Scientific Communications

Tertiary Tilting and Dismemberment of the Laramide Arc and Related Hydrothermal Systems, Sierrita Mountains, Arizona
W. J. A. Stavast, R. F. Butler, E. Seedorff, M. D. Barton, and C. A. Ferguson

Image Analysis and Composition of Platinum-Group Minerals in the J-M Reef, Stillwater Complex (U.S.A.)
B. Godel and S-J. Barnes


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