山东苍山三合地区磁异常特征及地质意义

Magnetic Anomaly Characteristics and Its Geological Significance in Sanhe Area of Cangshan County in Shangdong Province

摘要:

通过对山东苍山三合地区高精度磁测磁异常的揭露，利用钻孔剖面对磁化强度的大小、磁性体的形态、磁性体的厚度进行反演和分析，认为研究区的磁异常是由该区辉绿岩磁性层引起的，并且辉绿岩层的上部相对较强磁性物质的富集对磁异常的影响更大；研究区辉绿岩层可能是普遍存在的；ZK02孔相对ZK01孔部位的辉绿岩层具有埋藏浅、磁性均匀、厚度变化小的特点。研究区磁异常的原因可能是成岩后局部断裂构造的活动，部分磁性块体边端部位挠起引起的。

Abstract:

In this paper, based on high precision magnetic survey in Sanhe area of Cangshan county in Shangdong province, by using drilling profile, magnetization intensity, size and thickness of the magnetic anomaly have been inversed and analyzed. It is regarded that magnetic anomaly of the study area is caused by magnetic layers of diabase in this area, and the upper part of the diabase has stronger effect to magnetic anomalies than relatively strong magnetic materials. Diabase layers may be widely developed in study area. Diabase layers in ZK02 drilling pole has the characteristics of shallow buried depth, uniform magnetic and small variation in thickness than in ZK01 drilling pole. Magnetic anomalies caused by deep strong magnetic have not been seen in study area . The origin of magnetic anomaly may be the activity of regional fractured structure, part of the magnetic block edge end part scratched up after rock forming.