燧石在太古宙绿岩层中,燧石是次要的,但却是一种分布广泛的岩石类型。燧石可以出现在绿岩部面的任何部位,有时与火山岩相伴生,有时与硬砂岩-泥岩伴生,它也是条带状铁矿层的主要成分,常为几厘米厚的层状或条带状,厚层状一般很少。在一些绿岩带中,单个的燧石层沿走向可以追索好几公里,其变化厚度达50公里。在一些地区,角 Chert In the Archean greenstone, chert is secondary, but it is a widely distributed rock type. Chert can occur in any part of the greenstone part, sometimes associated with volcanic rocks, sometimes associated with the hard sandstone - mudstone, which is also the main component of the banded iron ore, often a few centimeters thick layer or strip, Thick layer is generally small. In some greenstone belts, a single flint layer can be reclaimed for several kilometers along the strike, varying in thickness up to 50 kilometers. In some areas, horns