Sentences with phrase «hydrothermal deposits»

They argue that, in order to understand how life formed on Earth, we should ignore the surface environments on Mars and focus exploration on hydrothermal deposits.

«Ancient, deep - water hydrothermal deposits in Eridania basin represent a new category of astrobiological target on Mars,» the report states.

The discovery of evidence for ancient sea - floor hydrothermal deposits on Mars identifies an area on the planet that may offer clues about the origin of life on Earth.

Geochemist Nicholas Tosca of Harvard University and his colleagues calculated the salinity of long - gone waters from the composition of the salts left behind both at Meridiani Planum, where the Opportunity rover found the remains of salty groundwater, and at Gusev crater, where Spirit found volcano - related hydrothermal deposits.

Not exact matches

The economic Battle Mountain — Cortez — Eureka Trend gold deposits were deposited as mineralized hydrothermal sedimentary - host replacement horizons and breccia zones along major fault structural zones where alteration and anomalous gold - silver - arsenic - antimony - thallium mineralization are present.

Marbles in metamorphic aureoles and iron - rich skarns appear to be favored sites for gold mineralization in these deposits, perhaps due to the rheological character, permeability after fracturing, and chemical reactivity of those rocks to alteration by hydrothermal fluids.

One site at Columbia Hills in Gusev crater, was visited previously by the Spirit rover and features silica deposits interpreted by some as analogous to hydrothermal springs known to be inhabited on Earth.

Impacts exposing subsurface ice deposits and generating hydrothermal activity are one possible explanation for the bright spots and Herschel's water vapor; «cryovolcanoes» that erupt volatiles such as water rather than rock are another.

They can be several tens of metres tall, and grow as minerals are deposited when the hot water meets the cold ocean water at the outlet of the hydrothermal vents.

UiB's scientists identified another large hydrothermal field with rich mineral deposits 300 km west of Bjørnøya in 2008.

Key hypotheses of the origin of this soil include hydrothermal activity generating sulfate - rich, hydrated deposits on early Mars similar to what is found along the flanks of active Hawaiian volcanoes on Earth.

Formation of metallic ore deposits are predicted to accompany the underwater hydrothermal activity, so the team also plan to evaluate these undersea resources.

«So far, we only know the surface of the ore deposits at hydrothermal vents.

Fuel - coolant reactions deposited volcanic rocks and promoted hydrothermal activity.

It has an unusually thick (nearly 2.5 km) basin fill, and much of this is almost black in colour (due to carbon) containing also hydrothermal metal deposits.

The network spans the Juan de Fuca plate, which sits between the Pacific and the North American plates and hosts earthquakes and tsunamis, giant clams and whale pods, along with hydrothermal vents and frozen methane deposits.

In contrast, today's geothermal projects use hydrothermal systems that tap naturally occurring water deposits to provide geothermal heat.

In addition, he notes, evaluating the fine structure of calcium carbonate mineralization deposited in hydrothermal systems during different periods of Earth's evolution may offer insights into which microbes lived at which times.

Hydrothermal activity generates sulfate - rich hydrated mineral deposits along volcanoes, similar to the soil surrounding Hawaiian volcanoes.

They range from hydrothermal activity, acid fog from extinct volcanos, and even efflorescence, which is how salt deposits form in basements or on brick walls.

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