Present-day volcanism on Venus as evidenced from weathering rates of olivine
At least some of Venus' lava flows are thought to be< 2.5 million years old based on visible
to near-infrared (VNIR) emissivity measured by the Venus Express spacecraft. However, the
exact ages of these flows are poorly constrained because the rate at which olivine alters at
Venus surface conditions, and how that alteration affects VNIR spectra, remains unknown.
We obtained VNIR reflectance spectra of natural olivine that was altered and oxidized in the
laboratory. We show that olivine becomes coated, within days, with alteration products …
to near-infrared (VNIR) emissivity measured by the Venus Express spacecraft. However, the
exact ages of these flows are poorly constrained because the rate at which olivine alters at
Venus surface conditions, and how that alteration affects VNIR spectra, remains unknown.
We obtained VNIR reflectance spectra of natural olivine that was altered and oxidized in the
laboratory. We show that olivine becomes coated, within days, with alteration products …
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