Vol. 309, Issue 2, 2009

Science Paper
Methane and the CH₄ Related Greenhouse Effect Over the Past 400 Million Years
David BeerlingRobert A. BernerFred T. MackenzieMichael B. HarfootJohn A. Pyle
Natural variations in the tropospheric CH4 concentration, excluding short bursts from geospheric reservoirs, have been estimated for the past 400 Ma by scaling a wetland CH4 emission estimate for the...
Science Paper
Thermodynamic Model for Diffusion Controlled Reaction Rim Growth in a Binary System: Application to the Forsterite−enstatite−quartz System
R. AbartE. PetrishchevaF. D. FischerJ. Svoboda
We present a thermodynamic model for diffusion controlled growth of a reaction rim of phase γ between the phases α and β in a two component system. We investigate the...
Science Paper
The Geochronological Framework of the Irumide Belt: A Prolonged Crustal History Along the Margin of the Bangweulu Craton
B. De WaeleI.C.W. FitzsimonsM.T.D. WingateF. TemboB. MapaniE. A. Belousova
Ion microprobe U-Th-Pb analyses of zircon from 40 granitoid rocks collected from the late Mesoproterozoic Irumide Belt in Central Southern Africa, along the southern margin of the Archean to Paleoproterozoic...