中国东部中生代盆地非金属成矿系列及成因机制

THE NONMETAL MINERALIZATION SERIES AND THEIR ORIGIN IN THE MESOZOIC BASINS EASTERN CHINA

本文通过对中国东部中生代火山-沉积建造特征及其中膨润土、沸石和珍珠岩成矿系列和形成规律的研究,认为上述非金属矿床的成矿作用主要受中生代北东、北北东向断陷带和断陷盆地的控制。区域构造控制了火山活动和沉积作用,从而控制了盆地的形成和演化,使其中堆积了相当厚的多旋回陆相火山-沉积建造,为膨润土、沸石等矿床的形成提供了丰富的类似的物源、相似的转化介质及古气候、古地理等必要的条件和环境。从而构成了上述非金属矿产共生与伴生的成矿系列,并广泛分布于中国东部三个成矿区和五个成矿带之中。

According to the study of mineralization regularity of bentonite, zeolite and pearstone in the Mesozoic volcanicsedimentary formation in Eastern China, the authors recognized that the formation of the nonmetal ore deposits above was essentially governed by the Mesozoic NE-and NNE-trending faults and fault-basins.The regional structures dominated the formation and development of the basins, so that a great thickness of terrestvial volcsnics and sedimentary rocks were formed in them.The polycyclic volcanic activities formed a complexed magma evolution series, with which associated sedimentary rocks correspond to the polycyclic sedimentary series composed mostly of diluvial fan, alluvial, lacustrine and turbidite facies that were intermittently Or nearly-synchronically formed with volcanic activities.The regular changes of the volcanic-sedimentary facies in time and space constituted a complexed Mesozoic volcanicsedimentary formation in Eastern Chins. It had provided abundant source materials, the medium enhancing the ore-transformation, the climate and the suitable places necessary for formation of those nonmetal deposits and related minerals. According to the characteristics described above, three mineralization districts and five mineralization zcnes were determined througout the Eastern China.