宣汉黄金口勘探区须家河组的砂岩岩石学特征

The sandstone petrology of Xujiahe Formation in Huangjinkou exploration area,Xuanhan County,Sichuan province

研究区须家河组砂岩由碎屑组分和填隙物组成。矿物碎屑主要由石英、长石和白云母组成,此外可见少量绿帘石、电气石、磁铁矿、黄铁矿、石榴子石和锆石等。岩屑主要有硅质岩屑、泥岩屑、板岩岩屑和千枚岩屑等。填隙物主要包括杂基和胶结物组成。杂基可见原杂基、正杂基和假杂基。胶结物主要为钙质和泥质。砂岩的岩石类型主要为岩屑砂岩,其次为为岩屑质石英砂岩及少量石英砂岩。

Sandstone is composed of detrital composition and interstitial material, in study area. Min- eral debris mainly composed of quartz, feldspar and muscovite, in addition to small amount of epi- dote, tourmaline, magnetite, pyrite, garnet and zircon, etc.. The rock debris are mainly composed by siliceous debris, mud debris, slate debris and phyllite debris. The interstitial material includs ma- trix and cement. It is found that matrix can further be subdivided into protomatrix, orthomatrix, pseudomatrix and the cements are mainly calcareous and muddy. The resouhs shows that type of sand- stone rock , in Xujiahe Formation of Huangjinkou exploration area, is mainly lithic sandstone, followed by lithic quartz sandstone and a small amount of quartz sandstone.