黔东松桃大塘坡地区南华系大塘坡组锰矿相带及分布规律

Manganese Ore Phase and Distribution of Nanhua Datangpo Formation in Datangpo Area,Songtao,East Guizhou

在大塘坡矿区钻孔编录与野外地层剖面观察实测的基础上,结合近年来有关大塘坡式锰矿的研究成果,对大塘坡矿区的锰矿相带及分布规律进行了研究。对大塘坡地区含锰岩系、菱锰矿体的沉积厚度等值线以及菱锰矿体的品位等值线研究表明,矿体的走向与大塘坡地区沉积盆地长轴方向一致,为北东60°左右,存在一大两小3个锰矿沉积中心。同时对大塘坡地区盆地中心矿体结构构造的研究表明矿体可分为中心相、过渡相、边缘相3个相带,其中中心相以气泡状和块状菱锰矿为主,伴随有软沉积变形层理等特殊构造,一般为多层矿;过渡相以条带状菱锰矿为主,块状菱锰矿为辅,主要为单层矿;边缘相主要为薄层条带状锰矿与炭质页岩互层,主要为单层矿。该相带分布受古天然气泄漏控制,喷溢口的分布与锰矿沉积中心基本重合,且从中心相到过渡相再到边缘相含锰岩系厚度、矿体厚度以及矿体品位逐渐降低,它们的变化规律保持一致,呈正相关性。

This paper discusses the manganese ore facies and its distribution in Datangpo mine on the basis of substantial detailed drilling catalogs and observations of stratigraphic sections and the Datangpo type manganese researches in recent years.The study of the manganese rock series thickness,the rhodochrosite ore deposit thinckness and the rhodochrosite ore grade reveals that the distribution ore bodies is the same with the long axis of the sedimentary basin,about NE 60 degrees.There are three seepage eruption sedimentary centers,one bigger and the other two smaller.The analysis of the characteristics of the texture and structure of the ore in the center of the basin in Datangpo area suggests that the ore can be divided three phases：the center phase,the transition phase and the edge phase.The center phase is mainly the bubble and massive rhodochrosite along the special structure with a soft sedimentary deformation beddings and is generally multi-mine.The transition phase is mainly banded rhodochrosite with a few massive rhodochrosite,primarily for the single mine.The edge phase is mainly interbedded with the thin banded manganese ore and carbonaceous shale.The phase distribution is controlled by the ancient gas leakage,the location of distribution of the mouth eruption.Substantially coincides with the manganese depocentres.From the center phase to the marginal phases and to the transition phase,the thinckness of the manganese bearing rock series and the ore body and ore grade gradually reduce.The thinckness of the manganese bearing rock series and the ore body and ore grade variation of a positive correlation.