鲁砚的基本特征及形成的主要地质环境

在查阅、综合前人资料的基础上，通过野外观察、采样，结合偏光显微镜和热分析的实验数据，分析了几种常见鲁砚石的矿物成分及形成的地质环境。研究结果表明：沉积岩类的鲁砚石矿物成分几乎以泥晶方解石为主，另含少量陆源矿物。变质岩类鲁砚石矿物成分以绢云母、绿泥石为主要矿物，另含石英，电气石等矿物。鲁砚石主要产于鲁西地块，形成期以寒武纪居多，形成环境多滨、浅海相，河湖相。

Basic Characteristics of Lu Inkstone and its Main Geological Environment

On the basis of previous data, through field observation and sampling, in combination of experimental data of polarizing microscope and hermoanalysis, mineral composition of some common Lu inkstones and the geological environment of these inkstones have been analyzed. It is found that sedimentary rocks are mostly composed of micrite calcite, with a small amount of terrigenous mineral; metamorphic rock type Lu inkstone are mostly composed of sericite and chlorite, with a small amount of quartz, tourmaline, etc. Lu inkstones are mainly found in western Shandong and mostly formed in Cambrian period with a preference of littoral, neritic, and lacustrine facies.