基于GIS的长江中下游同位素空间分布规律探究

Research on spatial distribution of isotopes in the middle and lower reaches of the Yangtze River based on GIS

文章利用地理信息系统(geographic information system,GIS)时空分析技术,对长江中下游地区开展同位素分析工作,进行了长江中下游地段同位素填图,并绘制了地球化学元素图,研究了区域内的地质特征、地球化学元素和同位素变化。研究结果表明,在长江断裂带沿岸锆石εHf(t)值较高,地质特征自西向东分为3段,断裂带和同位素对矿床产生的影响明显。通过对长江中下游地质特征、同位素数据及成矿作用类型的类比,结合GIS技术分析结果和该地区目前已有矿床资料,提出长江中下游断裂带中部深断裂北侧是长江中下游最有潜力的Cu-Au成矿地带。

This paper uses the spatio-temporal analysis technology of geographic information system(GIS)to carry out the isotope analysis for the middle and lower reaches of the Yangtze River,and makes the isotope mapping and the geochemical element map for the middle and lower reaches of the Yangtze River.The geological characteristics,geochemical elements and isotope changes in the region are studied.The results show that theεHf(t)value of zircons is high along the Yangtze River fault zone,and the geological characteristics are divided into three sections from west to east.The fault zone and isotopes have obvious influence on the deposit.Based on the analogy of geological characteristics,isotopic data and mineralization types in the middle and lower reaches of the Yangtze River,combined with the analysis results of GIS technology and the existing deposit data,it is proposed that the north side of the deep fault in the middle and lower reaches of the Yangtze River is the most potential Cu-Au mineralization zone in this region.