黔西南地区龙潭组玄武质火山碎屑岩中木炭碎屑的存在及地质意义

峨眉山玄武岩喷发期间,随着大量原始森林被焚烧,产生大量细小木炭碎屑和玄武质火山碎屑漂落在东部广阔浅海,沉积形成富含木炭碎屑玄武质沉凝灰岩,木炭屑具多孔蜂窝状极似浮石碎块,但薄片中不透明,光片中其反射率明显高于造岩矿物,它是炭的火焚丝质体。在黔西南广泛发育于贞丰、兴仁、睛隆、关岭等地的二叠纪龙潭组地层中。

Existence of Charcoal Fragments in Sedimentary Basaltic Volcanoclastic Rock and Its Implication in Geology, in Longtan Formation of Southwesten Guizhou

During the period of Emeishan basaltic eruption,accompanying with large number of original forest buried,fine charcoal fragments and basaltic volcanoclastic clastic are generated plentifully and blew to the extensive shallow margin at east,which sediments form charcoal-rich basaltic sedimentary tuff,the fragments of charcoal take shape of multi-porous honeycomb extremely similar to the clastic of volcanic foam,but appear to opacity in the laminate,with reflectivity distinctly higher than rockforming minerals in polished laminate,which is fire-burning fusinite of carbonate.There are widespread development within the strata of Permian Longtan Formaion in Zhengfeng,Xingren,Qinglong Guanling and the likes in Southwest Guizhou Prefecture.