山东沂南东汶河地区侵入岩地球物理特征及金刚石找矿前景浅析

Brief Analysis on Geophysical Characteristics and Prospecting Prospect of Diamond in Dongwenhe Area in Yi'nan County

摘要:

以往在山东沂南东汶河地区发现钾镁煌斑岩赋存，并获取金刚石颗粒及金刚石指示矿物，但该区第四系覆盖较广，地表地质调查很难查明煌斑岩的分布及赋存特征；本文针对沂南东汶河地区，利用岩矿石之间的物性差异，结合重、磁场特征优选靶区，通过综合地球物理勘探圈定物探异常，选取部分异常开展验证，基本了解了该区煌斑岩的分布及深部特征；根据区域地质、地球物理特征结合验证成果，分析了沂南东汶河地区金刚石找矿前景，对指导该区金刚石找矿具有重要意义。

Abstract:

In the past, the occurrence of lamprophyre has been found in Dongwenhe area in Yi'nan county, and diamond particles and diamond indicator minerals have been obtained. However, the distribution and occurrence characteristics of lamprophyre are difficult to be ascertained by surface geological survey because of the extensive coverage of Quaternary system in this area. In this paper, based on the differences of physical properties between rocks and ores, target areas based on the characteristics of gravity and magnetic fields have been optimized. Through comprehensive geophysical exploration, geophysical anomalies have been circled. Selecting some anomalies for verification, distribution and deep characteristics of lamprophyre in this area have been basically learned. According to regional geological and geophysical characteristics combined with the verification results, the diamond prospecting prospect in Dongwenhe area in Yi'nan county has been analyzed. It will play an important role in guiding the diamond prospecting in this area.