CAJ | 학술논문

我国北方沉积型铝土矿主要赋存于奥陶系灰岩与石炭系中统本溪组接触面的凹斗处，由于该接触面存在一定的密度差，故可以利用布格重力异常的低值区来圈定靶区。但由于观测面的起伏变化以及中间层校正和地形校正时密度选择不准的影响，使得布格重力异常会出现与地形成镜像或同向关系的“虚假异常”，这给靶区的圈定造成了一定的影响。为消除或削弱这种“虚假异常”，采用曲面处理方法和回归分析方法对布格重力异常进行处理。结果表明，通过这两种处理方法很好地消除了布格重力异常中的＂虚假异常＂，正确地反映了奥陶系灰岩与石炭系接触面凹斗的起伏形态，准确地圈定了靶区，达到了高效找矿的目的。
아국북방침적형려토광주요부존우오도계회암여석탄계중통본계조접촉면적요두처，유우해접촉면존재일정적밀도차，고가이이용포격중력이상적저치구래권정파구。단유우관측면적기복변화이급중간층교정화지형교정시밀도선택불준적영향，사득포격중력이상회출현여지형성경상혹동향관계적“허가이상”，저급파구적권정조성료일정적영향。위소제혹삭약저충“허가이상”，채용곡면처리방법화회귀분석방법대포격중력이상진행처리。결과표명，통과저량충처리방법흔호지소제료포격중력이상중적＂허가이상＂，정학지반영료오도계회암여석탄계접촉면요두적기복형태，준학지권정료파구，체도료고효조광적목적。
Sedimentary bauxite deposit in the northern part of China mainly locates in the sag of the touching area between Ordovician limestone and Carboniferous Benxi Group. For the reason that there is a density difference between the sides of the above touching re-gion, the target areas can be located by the low bouguer gravity anomaly. However, due to the influence by the observation on undulated surface and by the difficulties in density selection when apply the middle layer and the terrain corrections, the bouguer gravity anomaly may appears several mirroring or positive correlative false anomalies regarding to the topography, which gives troubles to determine the target areas. In order to eliminate or weaken this false anomaly, we obtained a new gravity anomaly by using a potential field on curved surface processing method and a moving window regression analysis method, and reinterpret it. The results show that the false anomalies can be well eliminated in bouguer gravity anomaly by these two methods, and the undulating topography of the above touching area is correctly reflected, and the target areas is accurately determined, which helps to achieve the efficient prospecting purpose.