THE FELDSPARIZED TEXTURE OF POST—MONTMORILLONITE SATURATED WITH KCl—THE MARKS FOR THE DOWNWARD—EXCAVATING SEA WATER CURRENT IN HYDROTHERMAL CYCLIC SYSTEM

After the montmorillonites saturated with KCl and experienced through compaction or heatings,feldsparizations would take place,bringing about the transformation of sodium-montmorillonites into iso-potassium feldspars and calcium-montmorillonites into plagio-clases.In the sedimentary rocks with 10μm clay,the iso-potassium feldspar is the product from the sodium-montmorillonites with high pressure in sedimentary system of trench-trough or graben,Therefore,the iso-potassium feldspar can be taken as the marks for the dynamic characters of downward-excavating sea water current in hydrothermal cyclic system.Based on existence of the iso-potassium feldspar,the ratio of the characteristic peak values of 3.71A,4.23A and 3.3A in the oriented X-ray deiffratogram(XRD)is about 1:1:3.8.Such a diffratogram texture may be fixed in a certain ratio and is probable to be the proecursor of graphic granites.