松桃大塘坡菱锰矿床矿枕形成机理初探

A Preliminary Discussion on the Formation Mechanism of Ore Pillows of Datangpo Rhodochrosite Deposit in Songtao County,Guizhou Province

松桃大塘坡菱锰矿床是我国较重要的锰矿床之一.其菱锰矿矿体以枕状这一特殊形态产出。通过对沉积环境、矿枕与围岩的接触关系及成岩早期对矿层的力学分析探讨后。认为菱锰矿枕的形成,是由于成岩早期富含水份的炭质粘土岩层因触变产生超孔隙压力而液化。液化物质沿盆内次级斜坡滑动过程中对矿层的向上“侵位”

Datangpo Rhodochrosite Deposit in Songtao County, Guizhou, is one of important manganese deposits in China, whose ore bodies occur in a special form of ore pillows. According to the contacting relations between its sedimentary environment, ore pillows and surrounding rocks and through stress analyses of the ore beds in early rock-forming period, the ore pillows of the rhodochro-site deposit are thought to have been formed in the early rock-forming period when rich water-bearing carboniferous clay rock layers were liquefied under the superporous pressure caused by contacting metamorphism. The liquefied substances sliding along the secondary basin's slope surface were formed after they upward intruded into ore layers.