华南中生代花岗岩型、火山岩型、外接触带型铀矿找矿思路(Ⅱ)

笔者认为,对华南中生代富大铀矿成矿背景的研究要强调壳幔交换的深部作用,强调构造体制变革对成矿的制约,以及两条火山岩带和一个岩浆活动区的成矿地位.构造研究中要引进伸展构造理论,研究盆岭构造、热隆构造及与变质核杂岩构造配套的常见构造型式,研究盆岭耦合特点.成矿模式要考虑岩浆定位部位深浅及形成构造环境差异、地化环境差异,要探索大型、超大型铀矿形成的岩浆定位部位与层圈构造、地壳韧脆性构造转换面、地球化学转换面的耦合条件.

Prospecting ideas for Mesozoic granite-type,volcanic-type,exocontact-type uraniumdeposits in South China(

The author considers that the research on metallogenic environment of Mesozoic rich-large uranium deposits,the deep process of crust-mantle exchange,the constraints of tectonic regime revolution to uranium ore-formation,and metallogenic significance of the two volcanic belts and one region of magmatic activities must be emphasized.It is necessary to introduce extensional tectonics,to study the basin-and-range tectonics,thermo-upwelling tectonics,as well as those structural patterns commonly associated with metamorphic core complexes,to study characteristics of basin range coupling.The depth of magma emplacement to the difference of the tectonic,and the geochemical environments should be taken into consideration while setting up metallogenic model and a series of metallogenic models must be established.The research on the magma emplacement place and the layer-shaped structures, the coupling conditions of the transform surface between brittle and ductile structures in the earth crust,and the geochemical transformation for the large and superlarge uranium deposits must be strengthened.