Fig. 8From: Genesis of host rock in the Tamusu Mudstone pre-selected area in Northwest China for high-level radioactive waste geological disposal purposesClassification triangle diagram of the Tamusu Mudstone, COX clay and OPA clay based on Zhong et al. (2018). a Tamusu data points; b COX and OPA data points. The COX clay data are from Gaucher et al. (2004) and the OPA clay data are from Ould Bouya (2014) QFM = quartz + feldspar + micaBack to article page