鄂尔多斯盆地多种能源矿产分布及其构造背景

Distribution and Tectonic Background of Various Energy Resources in Ordos Basin

借助“成矿系统”的思维,探讨鄂尔多斯盆地成矿(藏)系统形成机制及其构造背景.盆地于中生代处于大地构造体制转折的重要阶段,盆地边缘的造山活动显著,盆内亦分别于晚三叠世、晚侏罗世与晚白垩世左右发生过3次构造热事件.区域构造体制转换事件导致了多种成藏(矿)作用的发生.盆地内部的构造热事件引发了有机流体的活动,周缘造山作用产生了向盆内流动的无机含铀热液.有机和无机流体的活动过程中存在相互作用,有机流体的存在形成氧化-还原障,导致无机流体关键物理化学参数的转变,在氧化-还原界面处成矿.突变成矿和界面成矿是多种能源矿产成矿过程的主要机制.

The formation process of the various energy resources coexisting system and its regional tectonic background m Ordos basin are analyzed by introducing the ＂metallogenic system＂ theory in this paper. The Mesozoic is the important transition period of the regional tectonic regime, during which the orogeny is outstanding around the basin and three rectothermal events took place in the basin. The transition of the tectonic regime induces the occurrence of various accumulating processes of the inorganic and organic fluids, for example, the organic fluid in the basin is activated by the recto-thermal events and the inorganic fluid flowing towards the basin is produced due to the orogeny. The reciprocity between the inorganic and organic fluids happens during their transporting. The existence of the organic fluid produces the redox barrier, which causes the mutation of the physicochemical parameters of the inorganic fluid and the precipitation of the uranium element at the interface. The mutation and interface effects are obvious in the formation of the various energy resources.