鲁西地区航磁特征及其反映的地质意义

Aeromagnetic Features and Their Reflected Geological Significance in Western Shandong

以鲁西航磁资料为基础,结合以往地质、地震勘探等资料,对研究区引起磁异常的成因、断裂构造发育情况、岩浆岩的分布规律以及对煤层的影响进行了分析。结果表明,研究区磁异常大都由隆起的高磁性基底以及岩浆岩、铁矿所引起,异常形态特征复杂;断裂构造发育,其既控制了研究区内岩浆岩的分布,同时也控制了煤的赋存范围;岩浆岩对煤质影响极大。依据鲁西航磁异常推断深大断裂11条,圈定岩浆岩带12处,并推测高磁性的基底隆起有利于铁矿发育,凹陷区内有利于煤的形成。

On the basis of aeromagnetic data, combined with previous geological and seismic information, carried out analysis of study area magnetic anomaly causation, faulted structure development situation, magmatic rock distribution pattern and their impacts on coal seams. The result has shown that the magnetic anomalies in study area are mostly caused by uplifted high magnetic basement, magmatic rocks and iron deposits. Anomaly morphological features are complex, faulted structures developed, not only controlled magmatic rocks distribution, but also controlled coal hosting range;impact from magmatic rocks on coal quality is very large. On the basis of aeromagnetic anomaly in western Shandong has inferred 11 deep-seated faults, delineated 12 magmatic rock belts; speculated that high magnetic basement uplift is propitious to iron ore development, in depression area is beneficial to coal formation.