《Table 1.Mineral contents from X-ray diffraction analysis of parametamorphic rocks in Pingxi area.》下

  提示：宽带有限、当前游客访问压缩模式

本系列图表出处文件名：随高清版一同展现

《"Characteristics of parametamorphic rock reservoirs in Pingxi area, Qaidam Basin, NW China"》

1. 获取 高清版本忘记账户？点击这里登录

1. 下载图表忘记账户？点击这里登录

The analysis of rock mineral composition and combination characteristics of metamorphic rocks can restore their original rock types，and the original rocks of the metamorphic rocks such as slate，schist，gneiss，quartzite and marble are mostly sedimentary rocks[19-20].The rock types of parametamorhpic rocks in Pingxi area are mainly slate，crystalline limestone and calc-schist，the original rock of them is Ordovician–Siludian sedimentary rock.X-ray diffraction analysis of the whole rock indicates that the slate is mainly composed of quartz and clay（aluminum-rich series）（Table 1） ，with residual quartz and feldspar visible in the thin-section（Fig.2b），so the original rock of slate is mudstone，silty mudstone，siltstone or fine sandstone.The crystalline limestone is made up of calcite（rich calcium series），quartz and clay largely in close contents（Table 1），indicating that the original rocks are mainly silty limestone，silt-bearing micrite and argillaceous limestone.The main minerals of calc-schist are clay，calcite and quartz close in content（Table 1），with calcite and sericite visible in the thin-section（Fig.2h），which shows that the original rocks are mainly lime siltstone，lime mudstone and argillaceous limestone，and silty limestone.The granite around the parametamorphic rocks is the product of lava cooling formed in early Devonian，so the original rock must be formed in the Ordovician-Silurian period before.The primary rocks of the parametamorphic rocks in the Pingxi area are mainly carbonate，with some clastics and clay rocks，indicating they were formed in the Ordovician-Silurian marine sedimentary environment.