内蒙古维拉斯托锡多金属矿床含矿斑岩体钾长石斑晶的有序度及成因探讨

THE ORDER DEGREE AND ORIGIN OF K-FELDSPAR PHENOCRYSTS IN THE MINERALIZED PORPHYRY OF THE WEILASITUO POLYMETALLIC DEPOSIT IN INNER MONGOLIA

摘要: 钾长石有序度及结构温度可以为探讨成矿物化条件等提供依据.为阐明本区钾长石的成因，通过对维拉斯托斑岩体中钾长石斑晶的红外光谱分析，其有序度为0.85~0.95，三斜度为0.7~0.9，测定的结构温度为547.17~578.36℃，表明钾长石斑晶为微斜长石.并探讨了钾长石的成因，认为它是热液蚀变的产物.

Abstract: The study of order degree and structural temperature of K-feldspar can provide significant information about the forming physicochemical conditions of deposit. Infrared spectroscopy is used to test the K-feldspar phenocrysts from the mineralized porphyry in the Weilasituo polymetallic deposit. The result shows that the order degrees range from 0.85 to 0.95, with triclinities of 0.7-0.9. The structural temperatures are 547.17-578.36℃, suggesting that the K-feldspar phenocrysts are microcline. It is confirmed that the K-feldspar is a product of hydrothermal alteration.