摘要
文章通过系统梳理津巴布韦克拉通成矿年代学研究成果,结合野外观测工作、赋矿岩体间接年龄测定以及热液矿物的同位素年龄测定,总结了其区内典型地区如Harare-Shamva绿岩带、Midlands绿岩带、Mutare绿岩带及Limpopo活动带北缘的金矿化时限分布特征,提出主金矿化年龄分布范围为2 660 Ma—2 610 Ma,接近于新太古代地壳块体稳定克拉通化阶段末期,属同构造期或后构造期成矿;另一期矿化作用时限为2 420 Ma—2 380 Ma,与后克拉通化作用中大岩墙的侵位、区域性应力转换拉伸以及再活化作用引起的广泛的岩浆作用有关。两期矿化作用事件可与其它地区典型克拉通相类比。
Combing metallogenic geochronological results of the Zimbabwe Craton, unequivocal field re- lationships, robust isotope systems constrain the timing of gold mineralization in major greenstone belts such as Harare-Shamva Belt, Midlands Belt, Mutate Belt and Northern Marginal Zone of the Limpopo Belt. The two phases of gold mineralization of 2 660 Ma-2 610 Ma and 2 420 Ma-2 380 Ma have been established. The former is syn-tectonic and approximate to end of stable eratonization of the Neoarehean crust and the latter related to the post-cratonization emplacement of the great dyke and extension resulted from regional stress transformation and wide-spread magmatism from reactivation. The phases can be cor- related to those of typical cratons all over the world.
出处
《地质找矿论丛》
CAS
CSCD
2016年第4期607-615,共9页
Contributions to Geology and Mineral Resources Research
关键词
金矿化年龄
太古宙
克拉通
津巴布韦
timing of gold mineralization
archaean eon
craton
Zimbabwe
