蒙脱石氯化钾饱和后的长石化结构——热液循环体系海水潜入区的标志

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

蒙脱石氯化钾饱和后,经压实或者加热,会出现长石化,钠蒙脱石向类钾长石转化、钙蒙脱石向斜长石转化。在沉积岩10μm级粘土中,其类钾长石是在海沟-海槽和地堑沉积体系中由钠蒙脱石在高压下成岩转化而成。类钾长石可以作为热液循环体系中海水潜入的地球动力特征标志。 本文发现了类钾长石的存在,在定向的X光衍射XRD图中,3.71A、4.23A和3.3A特征峰的比值为1:1:3.8,这种结构可能是按一定比例的,由类微斜钾长石与低石英组成的复合物,这种物质可能是文象花岗岩的先质。

After the montmorillonites saturated with KC1 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.