Siliceous hot-spring deposits, or sinters, typically form in active, terrestrial (on land), volcanic
terrains where magmatically heated waters circulating through the shallow crust emerge at …

Five silica phases are major components of silica sinters, deposited from both near-neutral
pH alkali-chloride and acid-sulfate thermal waters, and of silica residues formed at the …

uring the spring of 1960, an uncle showed me a 'petrifying spring'near Plaxtol in Kent
Dwhere twigs had been encased in a calcareous jacket. A twig was collected and having …

Tridymite, a low-pressure, high-temperature (> 870° C) SiO2 polymorph, was detected in a
drill sample of laminated mudstone (Buckskin) at Marias Pass in Gale crater, Mars, by the …

Chert deposits preserve a record of secular change in the oceanic silica cycle. The
evolutionary radiation of silica-secreting organisms resulted in a transition from abiological …

The presence of outcrops and soil (regolith) rich in opaline silica (∼ 65–92 wt% SiO2) in
association with volcanic materials adjacent to the “Home Plate” feature in Gusev crater is …

Multiple abiotic and biotic factors combine in nature to influence the formation of calcium
carbonate limestone deposits. Systems Geobiology studies of how micro‐organisms …

The origin and age of opaline silica deposits discovered by the Spirit rover adjacent to the
Home Plate feature in the Columbia Hills of Gusev crater remains debated, in part because …

White, vitreous, siliceous sinter dated by 14C at∼ 1900 years BP is located along the crest
of the Opal Mound deposit at Roosevelt Hot Springs, Utah, USA Deposition at vents resulted …

This report reviews how terrestrial hot spring systems can sustain diverse and abundant
microbial communities and preserve their fossil records. Hot springs are dependable water …