广西丹池盆地地球化学场演化与成矿

阐述了丹池盆地盖层和基底地层中元素的初始富集。据丹池盆地地球化学场演化史,划分了扬子、加里东、海西、印支四个地球化学域。对海西地球化学域划分为大厂和合山两个地球化学阶、进而划分了罗富、大厂、石炭、合山四个地球化学旋回,12个地球化学相。指出了罗富旋回、大厂旋回、合山旋回的AlSi相、SiAl相、CaSiAl相为丹池盆地成矿带的矿源层。在论述丹池盆地地质构造,地球化学场演化的基础上,指出丹池成矿带的成矿作用是:在长期的地质、地球化学场演化过程中,以地质构造运动为主导,沉积地球化学场,岩浆地球化学场、构造地球化学场三者融为一体,形成特大型工业矿床。

THE EVOLUTION OF THE GEOCHEMICAL FIELD AND MINERALIZATION IN DANCHI BASIN,GUANGXI

The primary concentration of the elements in the cover and basement ofDanchi basin is explained. According to the evolutional history of thegeochemical field in Danchi basin, the authors divide it into fourgeochemical domains: Yangtse, Caledonian, Hercynian and Indo-Chinese.The Hercynian geochemical domain is subdivided into the Dachang geoche-mical stage and the Heshan geochemical stage, four geochemical cycles and12 geochemical facies. It is shown that the Al-Si facies of the Luohu cycle,the Si-Al facies of the Dachang cycle and the Ca-Si-Al facies of Heshanare ore-source strata of the Danchi basin metallogenetic zone. On the basisof studies on the evolution of geological structures and geochemical field inDanchi basin, it is indicated that during the prolonged evolutional processof geochemical fields, as a result of a leading role of geotectonic movements,three-in-one combination of the sedimentogeochemic al field, magmatogeoche-mical field and tectonogeochemical field, large-scale industrial ore depositswere formed.