论文部分内容阅读
重力异常是地下不同规模、形态和埋深的不均匀地质体的综合响应.通过从重力异常中提取目标地质体异常,可以探测隐伏矿床、岩体或构造.而重力异常的高阶垂向导数不仅可以通过突出浅而小的地质体异常、压制区域性深部地质因素的影响来提高局部地质因素分辨能力,还可以区分水平叠加异常,确定地质体或构造边界.但阶数越高的导数,带来的高频干扰越严重.相对于其它高阶导数而言,垂向二阶导数是一种较为成熟的位场数据处理和解释方法.本文通过对攀西地区重力异常垂向二阶导数的特征分析,推断了攀西裂谷基本结构,并将其与区内已知金属矿床及重要成矿带分布位置对比,由此发现,区内主要金属矿床和成矿带均沿裂谷带分布,且沿裂谷轴部分布最为密集.结合攀西裂谷成因机制,进一步指出,区内金属矿找矿方向主要沿与岩浆热液作用密切相关的裂谷构造发育端展布.
The gravity anomaly is the comprehensive response of heterogeneous geologic bodies with different scales, forms and burial depths in the underground.The hidden geologic beds, rocks or structures can be detected by extracting the anomalies of the target geologic bodies from the gravity anomalies.The high-order vertical derivatives of gravity anomalies It not only can enhance the resolving power of local geological factors by highlighting the shallow and small geologic anomalies and suppress the influence of regional deep geological factors, but also can distinguish the horizontal superimposed anomalies and determine the geological body or the boundary of the structure.But the higher order derivatives, The more serious the high-frequency interference brought.Compared with other high-order derivatives, the vertical second-order derivative is a more mature method of data processing and interpretation of the field.Based on the Panxi area gravity anomalous second derivative , The basic structure of Panxi rift is deduced and compared with the distribution of known metallogenic deposits and important metallogenic belts in the area. It is found that the major metallogenic deposits and metallogenic belt in the area are all along the rift zone Distribution, and distribution along the rift axis is most densely distributed.Based on the genesis mechanism of Panxi rift, it is further pointed out that the ore-prospecting direction of the metallogenic area in the area is mainly along the rift that is closely related to the hydrothermal fluid Developmental end made spread.