论文部分内容阅读
在鲁西太古宙绿岩带中，分布有较多的绿岩带变生热液－构造蚀变岩型金矿，具有良好的找矿前景。从铅同位素组成来看，区内铅同位素变化较大，多为放射性成因铅质量分数较高的异常铅。所测同位素样品中，以黄铁矿铅同位素组成变化最大，是铅同位素在演化过程中受到放射性铀铅和钍铅不同程度混染的结果，多数样品单阶段模式年龄不具计时意义。计算表明，区内铅来源于ｕ＝９．２０，ｗ＝３７．４５，ｋ＝３．９５的源区，在５９５Ｍａ前从源区分离出来，之后被形成于２４６３Ｍａ～１５３４Ｍａ的放射性成因铅混合并形成矿床。由Ｚａｒｔｍａｎ和Ｄｏｅ铅构造模式可知，本区绿岩带金矿床以幔源铅为主，部分是幔源物质与上地壳物质不同程度混染的产物。矿石铅、地层铅和岩体铅的共线性说明金矿床的形成既与地层有关，又与花岗岩体有关，金矿床是经构造、岩浆活动使其基底物质活化、迁移、混合、富集而形成的。
In the Luxi Archean greenstone belt, there are more greenstone-altered hydrothermal-tectonically altered rock-type gold deposits, which have good prospecting potential. Lead isotope composition from the point of view, the larger changes in lead isotopes in the region, mostly lead to higher radioactive lead content of lead. In the isotope samples tested, the change of pyrite lead isotope composition is the largest. It is the result that Pb isotopes are mixed by radioactive uranium-lead and thorium-lead in varying degrees during evolution. The single-stage model ages of most samples are not statistically significant. Calculations show that Pb in the source region originated from the source region with u = 9.20, w = 37.45 and k = 3.95, separated from the source region before 595Ma, and then formed into lead mixed lead at 2463Ma ~ 1534Ma And the formation of deposits. According to the Zartman and Doe lead tectonic models, the mafic-lead deposits in the greenstone-gold deposits in this area are mainly dominated by some mantle-derived materials mixed with upper crustal materials to some extent. The collinearity of lead, lead and lead in ore shows that the formation of gold deposits is not only related to the strata but also related to the granite. The gold deposits are formed by activation and migration, mixing and enrichment of the base materials through the structure and magmatism of.