weathering-potential index

REE and trace element data supported the conclusion further. The chemical index of weathering ( CIW) as well as TiO 2 and Al 2 O 3 concentrations reflected a more intense weathering in the provenances of the shales in north part.

北部页岩明显偏高的TiO2和Al2O3含量以及化学风化指数（CIW）表明北部沉积物的源区经历了更强烈的风化作用。

Then, through organic combination of rock mass block index and absolute weathering index in the general sector scope table, the quantitative method of GSI is constituted.

引入基于钻孔岩芯不同完整长度的岩体块度指数，以定量地表征岩体结构。

According to the results of paleoclimate study and estimate of semi-quantitative weathering index, the weathering extent of sediments was low and the topographic relief between the Kuqa Depression and South Tianshan was obviously in Early-Middle Triassic;

根据风化指数半定量计算的结果，结合前人古气候的研究成果，早-中三叠世该区沉积物风化程度低，推测此时地形高差较大；