赣中宁都北部地区新构造活动初探

江西省中部宁都北部地区断裂构造发育,ETM453合成图像线形影像主要有北东向、北北东向和北西向,少量近东西向,线性构造具明显的新构造运动踪迹,地质证据有断层的走滑、地震、温泉和水系被错断等。其中,斜贯研究区中部的桃山断裂构造为一向南东下滑的右行张扭性断层,具捩断层性质,其挽近时期明显的构造运动造成桃山构造上盘距构造面不远的地带,特别是桃山构造的北东端如打鼓寨岩体北东部及外围,侵蚀作用较弱,保矿条件较好,具有较大的找矿潜力。

A preliminary study on neotectonics in northern Ningdu area,central Jiangxi province

The linear fractures are developed extensively in northern Ningdu county,central Jiangxi province. Based on landset-7 ETM⁺RGB synthesis image,the author interpreted out four groups of linear fractures,namely, NE-,NNE-,NW-,and a few of EW-trending faults. All of them showed a distinct traces of neotectonism with evidence from strike-slippinp of faults,earthquakes,hot springs, etc. The NE-striking Taoshan fault,developed in the dike-structure belt in neotectonism period,was a dextral transtensile one with SE-dipping at 65°～70°,with the southeast block downsliding and tear faulting occurring,so that the upper plate of the fault,especially its northeast part,was relatively weaker eroded. There might be a good ore-protecting conditions and more prospecting potential in those regions for uranium ore exploring.