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术语本文所采用的“铁岩(ironstone)”这一术语是指含铁15%以上的化学沉积岩.“含铁建造(iron formation)”是指主要由铁质岩组成的、最上层和最底层均为铁质岩的可在地质图上标示出的岩石单元.化学沉积岩限于其体积占50%以上的无机和(或)有机化学沉淀物,这些沉淀物来自地表水体和(或)那些沉淀物的成岩交代产物.铁质岩可由主要的富铁和贫铁矿物来修饰,如:条带状菱铁矿-燧石铁岩和鲕状赤铁矿-石英铁质岩,其中“燧石”包括重结晶燧石,
TERMS As used herein, the term “ironstone” refers to chemical sedimentary rocks that contain more than 15% iron. “Iron formation” refers to a composition that is composed primarily of ferrochones, most Upper and lower stratigraphic units are all lithofacies that can be identified on the geological map, and chemical sedimentary rocks are limited to inorganic and / or organic chemical sediments accounting for more than 50% by volume of sediments from surface waters and / or ) Sedimentary diagenetic metasomatisms, which are modified by the major iron-rich and iron-poor minerals such as banded siderite-chert rock and oolitic hematite-quartzite, of which “Flint ” includes recrystallized flint,