Decades-old measurements of atmospheric and elemental surface composition constrain the history of Venus. In this study, we search for a model featuring continuous evolution in the stagnant-lid regime that predicts the present-day atmospheric mass of radiogenic argon and satisfies the other available constraints. For comparison, we also consider the end-member scenario of a single catastrophic ...

Lichen in the Mists of Time Flipping Across the Membrane Qubit Version of Fourier Transforms Coordinating Plant Defenses Marine Nitrogen Pools How Hydrogen Hung Around Out of Africa Revisited pH Makes the Switch Leprosy Migrations Tropical Degassing Round-the-Clock Metabolism The Maturing Repertoire of Canary Songs Cold Ocean Stratification Location and Molecular Manipulation Chaperones of the ...

Magma degassing processes are commonly elucidated by studies of melt inclusions in erupted phenocrysts and measurements of gas discharge at volcanic vents, allied to experimentally constrained models of volatile solubility. Here we develop an alternative experimental approach aimed at directly simulating decompression-driven, closed-system degassing of basaltic magma in equilibrium with an H^C^...

A parameterized model of mantle convection that includes the effects of volatile exchange between the mantle and the surface reservoir and the softening of the mantle by the dissolved volatiles is used to study the thermal history of the Earth. It is assumed that the activation energy for temperature-dependent solid-state creep is a linear function of weight percent of volatiles. The mantle deg...