利用区域物探重磁资料圈定黔东金刚石母岩钾镁煌斑岩的尝试

Determination of Diamond Parent Rock in Eastern Guizhou By Regional Geophysical Prospecting Gravity and Magnetic Information

本文试图据镇远马坪一带分布的钾镁煌斑岩露头,及与之对应的1∶20万区域重磁异常的特征响应值(剩余重力异常值(1～4)×10-5m/s2、航磁异常值(2～12)nT)为线索,以辉石重砂异常点分布、金刚石砂矿出土点分布、金刚石指示矿物铬尖晶石发现点分布、有限物性资料及局部重磁异常分布特征为基础,对台江-剑河-锦屏-黎平一带出现的1处大型重磁(航磁环状异常)正异常进行研究及圈定,结合浅部的重磁异常特征,推断这个区域可能是贵州原生金刚石矿床赋矿岩筒驻留的有利地段。据此,建议贵州金刚石找矿,工作布署在以剑河为中心的重磁异常重合的集结部位,重点对南嘉-平秋一带分布的G3(T3)物探异常为优先勘探解剖目标。

In this paper,it tried to take lamproite outcrop in Maping area and its correlative spectral response value of 1∶200,000 regional gravity and magnetic abnormality as the clue,the distribution of Augitic Placer Abnormality,diamond placer deposit,chrome-spinel which is the target mineral of diamond,limited material and part gravity and magnetic abnormality points as the basis,a big gravity and magnetic abnormal in Taijiang-Jianhe-Liping area is studied and determined.Combine with the gravity and magnetic abnormal in the shallow area,it＇s inferred that this area maybe the preferable ore-bearing pipe area of original diamond in Guizhou.Therefore,it＇s suggested the diamond exploration should be done with the center of gravity and magnetic abnormal in Jianhe,the G3 geophysical prospecting gravity and magnetic in Nanjia-Pingqiu area as the earlier exploration target.