11/17: VPL Astrobiology Colloquium presents Steve Ruff

Event Details

11/17: VPL Astrobiology Colloquium presents Steve Ruff

Time: November 17, 2015 from 3pm to 4pm
Location: Adobe Connect
Website or Map: http://connect.arc.nasa.gov/u…
Event Type: online, seminar
Organized By: Mike Toillion
Latest Activity: Nov 17, 2015

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Event Description

On the Trail of Potential Biosignatures From Chile’s Atacama Desert to the Columbia Hills of Mars

Presenter: Steve Ruff, Arizona State University
When: November 17, 2015 3PM PST

Recent observations from Mars orbiter and rover missions provide unambiguous evidence for opaline silica (SiO2*H2O) in various settings on the Martian surface. In the case of opaline silica outcrops and soil identified by the Spirit rover in the Columbia Hills of Gusev crater, a suite of geologic features demonstrates that these materials are the products of a volcanic hydrothermal system. But the nodular expression of many of the outcrops and sub-cm-scale “digitate protrusions” they contain remained enigmatic. Now, remarkably similar features have been observed in small discharge channels emanating from hot springs and geysers in a high elevation geothermal field known as El Tatio in the Atacama Desert of northern Chile. The micro-digitate silica structures at El Tatio are possible microstromatolites, features that arise through microbial mediation of silica precipitation. By analogy, the comparable features on Mars are potential biosignatures.

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