Here we show experimentally that spheroidal siderite, which is preserved in many iron formation and could have been precursor to rhombohedral or massive siderite, ... Nature 276, 807–808 (1978) .

Carbon dioxide and oxygen, not methane, were prevalent in the Earth's atmosphere more than 1.8 billion years ago as shown by the absence of siderite in ancient soils but the abundance of the ...

No siderite in some ancient soils therefore implied lower levels of carbon dioxide. Ohmoto and his associates, however, looked at four, rather than one, parameters involved in siderite formation.

As the sun grew hotter, so did Mars, prompting much of its atmospheric carbon dioxide to rain out and ultimately get locked ...

In a nutshell NASA’s Curiosity rover discovered large deposits of siderite, a type of iron carbonate, in Gale Crater, offering the strongest in-situ evidence yet of an ancient carbon cycle on Mars.

A photomosaic taken by the Curiosity Rover on April 30, 2023 at the Ubajara drill site in Gale Crater, Mars. Rock powder samples drilled here contained substantial amounts of siderite (an iron ...

The siderite identified in Curiosity data helps confirm and refine models of Mars's early warm period, more than 3.5 billion years ago. It confirms that carbon dioxide was abundant in the Martian ...

A NASA rover taking rock samples on Mars has uncovered a plentiful mineral that was invisible to orbiters studying the Red Planet from space.. Scientists say the discovery of siderite, a type of ...

This article was originally published with the title “ The Rowton Siderite ” in SA Supplements Vol. 2 No. 38supp (September 1876), ... Scientific American is part of Springer Nature, ...

A 310-million-year-old horseshoe crab’s brain was preserved in clay, thanks to an uncommon fossilization process that protected the fragile neural tissues.

The siderite identified in Curiosity data helps confirm and refine models of Mars's early warm period, more than 3.5 billion years ago. It confirms that carbon dioxide was abundant in the Martian ...