甘肃梧桐井——旧井地区水系沉积物地球化学特征及评价

Geochemical characteristics and evaluation of sediments in the Wutong jing-Jiu jing area, Gansu Province

研究区位于塔里木-南疆地层大区塔南地层分区的敦煌地块,小西弓-帐房山华力西期-印支期金钨成矿带西段。地球化学景观为甘肃北山干旱、半干旱区,出露地质体受区域构造控制呈近EW向展布。本次在758km2范围内开展1:50000水系沉积物测量,分析15种元素,共圈定单元素异常129个,综合异常10个,利用R型因子分析划分元素组合,结合地质背景将圈定的异常归为4大类。从元素组合特征方面及异常查证情况分析,重点对水系沉积物测量中金异常特征进行分析,表明该区水系沉积物晕分布于构造展布方向一致,金异常晕对地层的选择性明显。

The study area is located in the Dunhuang block of the Taran stratigraphic division of the Tarim-Southern Xinjiang strata,the western section of the Xiaoxigong-Yingfangshan Hualixi-Indosinian gold-tungsten metallogenic belt.The geochemical landscape is arid and semi-arid in the Beishan Mountains of Gansu Province,and the exposed geological bodies are closely distributed in the EW direction by regional structural control.This time,the 1:50000 water system sediment measurement was carried out in the range of 758km2,and 15 elements were analyzed.A total of 129 elemental anomalies were identified,and 10 comprehensive anomalies were used.The R-type factor analysis was used to divide the element combinations,and the geological background was used to delineate the abnormalities.For 4 major categories.From the aspect of element combination characteristics and abnormality verification,the paper analyzes the gold anomaly characteristics in the sediment measurement of the river system,which indicates that the distribution of the sediments in the water system is consistent in the direction of structural distribution,and the selectivity of the gold anomaly is obvious to the formation.