摘要
对胶东据同位素的系统研究表明，本区据及其金矿床的成矿物质主要来自胶东岩群，燕山期是本区主要成岩成矿期，招远一莱州矿带放射成因铅由西向东有逐渐增高的趋势，这种现象的产生是受本区地层结构和岩石类型制约的。给出了在不依赖于其它同位素测试数据的情况下，利用铅同位素各参量的谐和性解析上交点年龄的方法。从而显示了本区各种同位素测定结果的和谐性、一致性。
Systematic study of lead isotope of gold deposits in Jiaodong area shows that on the background of two-stage lead evolution has been superposed by intermingling of mantle lead and crust lead.The two--stage model of lead isotope shows that lead originated from mantle or lower crust initially 29billion years ago in those area. The gold mineralization in Jiaodong area happened in Yanshan stage , andmineralization material originated from remelting of the Jiaodong rock group. In certain conditions, thedefinition of t2 value of the two--stage lead model may not depend on the tests of other isotopes ; with thelead isochron equation and interrelations of parameters (t, t t2, u1, u2 .. )of lead isotope, combining withthe dates of major thermal events in those area, t2 value can be worked out. Here the authors of this paper explain the method in detail.
出处
《长春科技大学学报》
CSCD
1999年第2期116-121,共6页
Journal of Changchun University of Science and Technology
基金
原地矿部定向基金
关键词
铅同位素
金矿床
幔源铅
地质特征
成矿年代
lead isotope,sochron
mantle-derived lead
crust--derived lead
Jiaodong rock group
