摘要
冀东、冀西广泛分布着以深变质绿岩带为主的变质基底 ,同时也是中生代岩浆活动十分发育的地区。剧烈的岩浆隐爆作用 ,对区内早期的绿岩带和其中的金及金矿床进行了强烈的活化改造 ,形成一批与岩浆隐爆作用有关的绿岩带再生型金矿床。该类金矿床由于赋存在不同的隐爆构造 ,具有多样性的矿化特征 ,可再细分为隐爆震碎角砾岩型金矿床、隐爆角砾岩筒型金矿床和隐爆侵入角砾岩墙型金矿床。文中较详细地阐述了各类金矿床的地质 -地球化学特征 ,它们相互间的空间分布关系及与成矿有关的浅成侵入岩的特征。指出隐爆角砾岩型金矿床常与重熔岩浆有关的脉状 -细脉浸染状金矿床、斑岩型金矿床共同产出 ,组成矿床组合 ,并具有垂直分带的分布特征 ,这对认识矿床的成矿机制和指导找矿有重大意义。最后 ,还讨论了成矿模式。
The Archean metamorphic basement with priority to hypometamorphic greenstone belts is extensively distributed in the East and West Hebei Province,and also Mesozoic magmatic activity is well developed in this area.With the intense magma cryptoexplosion,the early greenstone belts and gold deposits have been reworked strongly,and formed greenstone belt,also regenerated gold deposits related with magma cryptoexplosition.The gold deposits have various mineralized characteristicts with the different cryptoexplosion structure. They can subdivide into the cryptoshattering breccia type,cryptobreccia pipe type and cryptobreccia dike type. The geological-geochemical characters of the various typical gold deposits,their spatial distrubution relationship and the character of the hypabyssal intrusive related with mineralization are detailed expounded in this article. The cryptobreccia gold deposits often occured with the vein and veinlet-disseminated gold deposits related with the anatexis intrusive and the porphyry gold deposits,and form the mineral deposit association,and have the vertical zoning, which is of important significance to the search for mineral deposits. Finally, the mineralize model is discussed.
出处
《前寒武纪研究进展》
2002年第1期1-10,共10页
Progress in Precambrian Research
基金
国土资源部"九五"科技攻关项目 (95 - 0 2 - 0 0 3)资助
