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- W4308459281 abstract "Desert varnish’s secrets The micrometers-thick mineral coating known as desert varnish that paints stony surfaces black or rust is as ubiquitous as it is odd. It can be found in arid landscapes across the world—staining boulders burnt orange in Chile’s Atacama Desert or as part of the petroglyphs etched in southeastern Utah’s canyon walls—and possibly beyond. Scientists have studied desert varnish for over a century, but they still don’t fully understand how it forms. The components of the varnish, alternating bands of manganese oxide and iron oxide embedded in silica, come from dust. But these oxides’ high concentration flummoxes scientists. Some theories suggest that the oxides interact with silica, which also cements everything to rocks. Another popular explanation is that desert varnish is a mark of microbes at work. They may consume manganese oxide as an oxidant and leave behind an enriched ferric layer, only to redeposit the reduced manganese" @default.
- W4308459281 created "2022-11-12" @default.
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- W4308459281 date "2022-11-07" @default.
- W4308459281 modified "2023-10-16" @default.
- W4308459281 title "Rock mysteries, terrestrial and martian" @default.
- W4308459281 doi "https://doi.org/10.1021/cen-10039-newscripts" @default.
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