chemical sediment造句

• Evaporites are considered sedimentary rocks and are formed by chemical sediments.
• Boggs divides them into four categories; major minerals, accessory minerals, rock fragments, and chemical sediments.
• It is a fragment of a fully developed oceanic crust, consisting of plutonic, intrusive and volcanic rocks and chemical sediments.
• Jaspillite is also formed as exhalative chemical sediments in certain lead-zinc ore deposits, and as a hydrothermal alteration facies around submarine volcanism.
• The apron zone is generally more SEDEX ores, and is generally manganese, barium and hematite enriched, with cherts, jaspers and chemical sediments common.
• Sediments are usually contiguous with VMS deposits in some form or another and typically are present as ( manganiferous ) cherts and chemical sediments deposited within a submarine environment.
• Liquid water was prevalent, and deep oceanic basins are known to have existed attested by the presence of banded iron formations, chert beds, chemical sediments and pillow basalts.
• Arkose-hosted SedEx deposits are known in some cases, associated with arkosic strata adjacent to faults which feed heavy brines into the porous sands, filling the matrix with sulfides, or deposited within a predominantly arkosic layer as a distinct chemical sediment layer usually associated with a shale interbed or at the lowermost levels of a shale formation directly overlying arkosic sands ( for example, copper deposits near Maun, Botswana ).