For many decades, wood silicification has been viewed as a relatively simple process of
permineralization that occurs when silica dissolved in groundwater precipitates to fill vacant …

This paper provides a comprehensive review of the sinter deposits, formed largely of opal-A,
that are form around hot springs and geysers throughout the world. The discharge aprons …

Siliceous sinter is formed by biogenic and abiogenic opal deposition around hot springs and
geysers. Using Structure-from-Motion photogrammetry we generated three-dimensional …

Non‐crystalline silica mineraloids are essential to life on Earth as they provide architectural
structure to dominant primary producers, such as plants and phytoplankton, as well as to …

Worldwide, silicified woods are found in many geological formations. Significantly, the
organic materials of wood are no longer dominant; almost all wood fossils have been …

Abstract The Amazon River is the longest river in the world. The Tapajós River is a tributary
to the Amazon. At their junction, a marked decrease in water quality is evident from negative …

Temperature affects the timing of the transformation of amorphous silica (opal-A) into
crystalline (opal-CT) exponentially. Thus, in hot subseafloor environments opal-A is …

Silicified wood occurs abundantly in Middle Miocene flows and sedimentary interbeds of the
Columbia River Basalt Group (CRBG) in central Washington State, USA. These fossil …

Silicon stable isotope ratios (expressed as δ 30 Si) in biogenic silica have been widely used
as a proxy for past and present biogeochemical cycling in both marine and lacustrine …

Abstract The Permian Fengcheng Formation represents a series of deposits formed in an
alkaline saline lake, characterized by high proportions of cherts, located in the Northwestern …