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本文研究了我国西南晚二叠世煤田内Tonstein的垂直分布和水平分布特征;研究了Tonstein的分布与沉积环境和条件的关系、与含煤性的关系、与煤中矿物质组成的关系。指出了运用Tonstein的某些矿物学和地球化学标志,有助于对比煤层、预测煤质和恢复沉积环境。论述了在水平方向上Tonstein的副矿物数量和组成的分带性,以及Si-modulus、Ti-modulus的变化规律,并指出在某些特定条件下,Tonstein的Si-modulus具有鉴别层位的意义。根据Tonstein在煤层中分布的总的特点,Tonstein的岩石学、矿物学,以及si-modulus、Ti-modulus和Ga-modulus特点,提出了Tonstein的成因解释:在稳定的湖沼环境下,高岭石物质自介质中胶状絮凝沉淀后转变成Tonstein。
In this paper, the vertical distribution and horizontal distribution of Tonstein in the Late Permian coal field in southwestern China were studied. The relationship between Tonstein distribution and depositional environment and conditions, the relationship with coal content and the mineral composition in coal was studied. The use of some of Tonstein’s mineralogical and geochemical markers is pointed out to help contrast coal seams, predict coal quality and restore depositional environments. The Tonstein subordinate minerals in the horizontal direction and the zonation of composition and the variation of Si-modulus and Ti-modulus are also discussed. It is also pointed out that under certain conditions, the Si-modulus of Tonstein has the significance of discriminating horizon . According to Tonstein’s general characteristics of coal seam distribution, Tonstein’s petrology, mineralogy, and si-modulus, Ti-modulus and Ga-modulus characteristics, a Tonstein genesis explanation is proposed: in a stable lacustrine environment, kaolinite Material from the media gelatinous sedimentation after the change into Tonstein.