CAJ | 학술논문

铝土矿床受控于奥陶系灰岩构成的古地貌，与成矿盆地内赋矿地层石炭系本溪组的厚度正相关，盆地斜坡带、洼地、凹槽及岩溶漏斗地段是铝土矿富集有利部位。奥陶系灰岩与上覆地层有较明显的密度和电性差异，铝土矿体与围岩也存在密度差。借助于可控源音频大地电磁测深法（ CSAMT）及钻孔的标定，利用重力异常可以了解研究区的构造格架和奥陶系灰岩基底的起伏变化，确定局部高密度体的赋存状况及性质，并大致确定其埋深。在山西沁源成矿远景区中深部隐伏铝土矿调查中，采用1∶2．5万重力和CSAMT法直接与间接找矿相结合的方法取得了较好的应用效果，为钻孔布设提供了依据。
려토광상수공우오도계회암구성적고지모，여성광분지내부광지층석탄계본계조적후도정상관，분지사파대、와지、요조급암용루두지단시려토광부집유리부위。오도계회암여상복지층유교명현적밀도화전성차이，려토광체여위암야존재밀도차。차조우가공원음빈대지전자측심법（ CSAMT）급찬공적표정，이용중력이상가이료해연구구적구조격가화오도계회암기저적기복변화，학정국부고밀도체적부존상황급성질，병대치학정기매심。재산서심원성광원경구중심부은복려토광조사중，채용1∶2．5만중력화CSAMT법직접여간접조광상결합적방법취득료교호적응용효과，위찬공포설제공료의거。
Controlled by the ancient terrain composed of Ordovician limestone, the bauxite deposit is positively related to the thickness of Carboniferous Benxi Formation in the ore-forming basin, and the favorable positions for bauxite enrichment are slope belts, depres-sions, grooves and karst funnels. As there exist obvious differences between Ordovician limestone and overlying formations in density and electrical properties and between bauxite and surrounding rocks in density, Bouguer gravity anomaly can better reflect the tectonic framework in the study area and the rise-and-fall trend of the Ordovician interface, Bouguer gravity residual anomaly can reflect the oc-currence of partially high percentage of bauxite, and the combination of controlled source audio-frequenay magneto-telluric ( CSAMT) method and calibration of the drilling can efficiently infer the buried depth and occurrence of basement limestone. The authors have a-chieved good application result by using 1 ∶ 25 000 gravity and CSAMT method which combines direct prospecting and indirect prospec-ting, and the results provide a basis for deploying drill holes.