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 ?
The sub-samples of the fine fraction (<63 [micro]m) were digested, following the EPA guideline for siliceous sediments (EPA, 1996), in Teflon bombs using a microwave oven (Milestone, MLS-1200 Mega).
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).