吉林省白山市板石沟铁矿断裂构造地球化学特征  

TECTONIC GEOCHEMISTRY OF FAULTS IN BANSHIGOU IRON DEPOSIT,BAISHAN CITY,JILIN PROVINCE

作　　者：穆宏玉 刘正宏[2] 贾大成[1] 李鹏川 路恩兰 

机构地区：[1]吉林大学地球探测科学与技术学院,吉林长春130026 [2]吉林大学地球科学学院,吉林长春130061 [3]吉林省第四地质调查所,吉林通化134001

出　　处：《地质与资源》2017年第5期479-488,共10页Geology and Resources

基　　金：国家自然科学基金项目"吉林东部中生代基性岩墙群年代学和地球化学研究"(编号40973019);中国地质调查局项目"吉林省白山市板石沟地区铁及金矿整装勘查区关键基础地质研究"(编号12120114028001)

摘　　要：断裂构造中元素的迁移变化规律是构造地球化学研究的主要内容.白山市板石沟铁矿断裂构造发育,是开展断裂构造地球化学研究的有利地区.通过对板石沟铁矿17矿组和赵家沟矿组典型逆断层剖面测量,采集构造岩和周围岩石,分析常量元素和微量元素,利用构造地球化学剖面法、质量等比线法和特征元素比值来反映元素在逆断层中分布特征和迁移变化规律.通过分析认为在逆断层中常量元素SiO_2、Fe_2O_3、CaO、Na_2O亏损,Al_2O_3、K_2O富集,微量元素中Rb、Sr等离子半径较大元素富集,离子半径较小元素Co、Cr、Ni亏损,K_2O/Na_2O、V/Cr、Rb/(Ni+Co)在逆断层中呈现出高值,SiO_2/Al_2O_3、(Fe_2O_3+CaO+MgO)/Al_2O_3呈现出低值.依据这些构造地球化学特征可以用来判断断裂构造的存在,为断裂构造地球化学研究和板石沟铁矿勘查提供构造地球化学依据.The change rule of element migration in fault structures is one of the main concerns for tectonic geochemical study. The fault structure of Banshigou iron deposit in Baishan City,Jilin Province, is well developed. With survey on the No. 17 ore group from Banshigou iron deposit and typical reverse fault section in Zhaojiagou ore group, collecting tectonite and surrounding rock samples, analyzing major elements and trace elements,the distribution characteristics and migration patterns of elements in reverse fault are reflected by geochemistry section method,isocon analysis and characteristic element ratio. Based on the analysis,it is assumed that the major elements such as SiO 2, Fe2O 3, CaO and Na2O are depleted in reverse fault, while Al2O 3 and 运 2O are concentrated, with enriched long ion radius trace elements like Rb and Sr,depleted minor ion radius Co, Cr,Ni. The ratios of characteristic elements K2O /Na2O, V/Cr and Rb/ （Ni＋Co） show high value and SiO 2/Al2O 3,（ Fe2O3＋CaO ＋MgO ）/Al2O3 low value. The tectonic geochemical characteristics above can judge the existence of fault structure, and provide basis for tectonic geochemical study and Banshigou iron deposit prospecting.

关 键 词：构造地球化学 元素迁移 逆断层 板石沟铁矿 吉林省 

分 类 号：P618.31[天文地球—矿床学]