siliceous sediment

siliceous sediment

[sə′lish·əs ′sed·ə·mənt]
(geology)
Fine-grained sediment and sedimentary rock mainly composed of the microscopic remains of the unicellular, silica-secreting plankton diatoms and radiolarians. Minor constituents include extremely small shards of sponge spicules and other microorganisms such as silicoflagellates. Siliceous sedimentary rock sequences are often highly porous and can form excellent petroleum source and reservoir rocks.
References in periodicals archive ?
Siliceous sediment in the waterloo position intersected 3.
2,000 feet) of siliceous sediments above the regional Roberts Mountain thrust
The blue-band color reflectance shows similar cycles, probably because in this band calcite is more reflective than biogenic silica (although both calcareous and siliceous sediments appear white to the human eye).
The Red Hill project occurs within a window of lower-plate limestone exposed through chert and siliceous sediments of the upper-plate of the Roberts Mountains Thrust.
Wallrocks include shales / siltstones / greywackes / limestones as well as pillow basaltic debris flows and fine siliceous sediments.
These projects occur within a window of lower-plate limestone exposed through chert and siliceous sediments of the upper-plate of the Roberts Mountains Thrust.
These holes will collar in chert and siliceous sediments in the upper plate of the Roberts Mountain Thrust and test more favorable lower-plate carbonates and inferred northerly faults at depth in the vicinity of the surface and historic drill-indicated gold anomalies.
Underlying the Sheridan Property is a folded sequence of mafic volcanics, subvolcanic gabbro intrusions, siliceous sediments and extensive banded iron formation.