Near-surface reaction of CO2-bearing fluids with silicate minerals in peridotite and basalt forms solid carbonate minerals. Such processes form abundant veins and travertine deposits, particularly in… (More)
The Earth formed through the accretion of numerous planetary embryos that were already differentiated into a metallic core and silicate mantle. Prevailing models of Earth’s formation, constrained by… (More)
The 2.0 Ga pseudo-isochron age inferred from the mid-ocean ridge basalt Pb/Pb against Pb/Pb diagram is reexamined on the basis of a statistical box model of mantle processes. Simple equations are… (More)
Exceptionally preserved fossils—i.e., those that retain, in some manner, labile components of organisms that are normally degraded far too quickly to enter the fossil record—hold the greatest… (More)
Primordial silicate differentiation controlled the composition of Earth’s oldest crust. Inherited Nd anomalies in Archean rocks are vestiges of the mantle-crust differentiation before ca. 4300 Ma.… (More)
S U M M A R Y Deformation experiments on partially molten rocks in simple shear form melt bands at 20◦ to the shear plane instead of at the expected 45◦ principal compressive stress direction. These… (More)
A series of analytical solutions are presented for viscous compacting flow past a rigid impermeable sphere. The sphere is surrounded by a two-phase medium consisting of a viscously deformable solid… (More)