Interpretation of 1:200 000 Comprehensive Anomalies of Gravity and Magnetism and Geological Significance in Dongwuqi Area, Inner Mongolia
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摘要: 以东乌旗地区1∶20万重、磁数据为基础,针对一定深度地质构造的研究需要,提取了局部重力异常和航磁化极上延异常。对二者进行重磁异常对应分析,圈定13个重磁正相关异常,13个负相关异常。统计得出区内矿产地重磁相关系数值R主要在-0.4~0.4之间。分析认为区内正相关异常主要由高磁高密度侵入岩体引起,负相关异常主要对应区内古生界隆起等,推断结果与已知地质资料吻合。为当地基础性地质找矿工作提供了可靠的深部地球物理信息;也为重磁综合异常信息提取工作提供了较为有效的、可借鉴的经验方法。Abstract: Vertical first-order derivative of the local gravity anomalies and upward continuation of aeromagnetic anomalies reduced to the pole are calculated based on 1:200 000 gravimetric and magnetic data in Dongwuqi ar-ea, inner Monggolia, for study of the deep structure. The authors have delineated 13 positive anomalies and 13 negative anomalies in the study area. The statistical values R of correlation coefficient in deposit areas mainly fall between-0.4 ~ 0.4. The interpretation shows that the positive and negative anomalies are related to magmatic rocks and Palaeozoic uplift respectively. Some of the inference are proven by the geological data. The study pro-vides reliable information of geophysics for basic geological work and effective method for comprehensive anom-aly analysis of gravity and magnetism.
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