湖南下二叠统海泡石及其主要伴生粘土矿物的扫描电镜研究

海泡石是一种富镁的纤维状粘土矿物,为链-层状结构的含水硅酸盐。在自然界中分布不广,很少形成单独的大量堆积。但是因为它具有一系列有别于其他粘土矿物的极其有用的物理化学性能,因此,有着广泛的工业用途。

THE USE OF SCANNING ELECTRON MICROSCOPY IN THE STUDY OF LOWER PERMIAN SEPIOLITE AND ITS MAIN ASSOCIATED MINERALS IN HUNAN

The sepiolite clay deposits of hunan are all confined to the upper members of the Lower Permian Qixia Formation. These deposits may be classified into the marl type, "Ca-Mg shale" type and clay type according to lithology and sepiolite contents.
By means of scanning electron microscopy, this paper deals with the form and mineralogy of sepiolite and its bearings on the main associated clay minerals, as well as the formation and enrichment of sepiolite during weathering and reworking.
Four types of sepiolite are recognized in terms of the occurrence, form and genesis. Sepiolite in marls and Ca-Mg shales is thought to be formed by neoformation; Earthy sepiolite is the weathering products of the sepiolite-bearing rocks; paper sepiolite owes its origin to leaching, and "asbestiform" sepiolite is a kind of The infilling material within vein walls.
Both talc and montmorillonite were derived from sepiolite. The former is usually associated with sepiolite, and its content is inversely proportional to that of sepiolite. The scale, tenor and quality of sepiolite clay deposits are controlled mainly by weathering and reworking.