由<0.03mm的微晶方解石和<0.004mm 的泥晶方解石组成的岩石,分别称为微晶灰岩和泥晶(或叫隐晶) 灰岩,有时统称为灰泥石灰岩,也可叫石印石灰岩(作石印印刷用)。这类岩石是在水动力很弱或静水环境下的产物,其形成条件与粘土岩相似。微晶灰岩是灰岩的致密块状微晶集合体,主要化学成分为碳酸钙,为一种沉积岩。 市场上俗称为砭石。
... microcrystalline calcite ooze 微晶方解石软泥 microcrystalline limestone 微晶灰岩 microcrystalline ooze 微晶软泥 ...
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藏南定日地区在白垩纪中期发育一套浅灰色深灰色的以钙质页岩、泥灰岩及微晶灰岩为主的浅海陆棚相沉积,岩石中除含较高的粘土矿物及陆源石英矿物颗粒以外,还含有十分丰富的有孔虫化石。
The Middle Cretaceous shallow sea sediments, represented by a series of light dark gray marine clastic and carbonate rocks, were well exposed along the Gongzha Section in Tingri, southern Tibet.
上部为中薄层状富泥的含石膏质夹层的泥质泥晶灰岩、微晶白云岩组成的旋回性清楚的似蒸发潮坪层序。
The upper part is a set of evaporite quasi-tidal sequence with clear cycles which is made up of middle-thin-bedded, gypsum-bearing muddy limestone and dolomicrite.
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