Geological survey and study of fault structures in the shallowly covered Keluo area of Nenjiang County, Da Hinggan Mountains
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摘要:
位于大兴安岭北段东坡的嫩江科洛地区属于典型的浅覆盖区。针对该区特殊的地质地貌特点，尝试利用重力和航磁技术解译和推断，结合野外露头调查和查证的综合研究方法对区域内断裂构造进行识别和应力机制分析。通过基岩出露区的验证，该方法对浅覆盖区断裂构造性质及活动特点的推断解释具有较明显的效果。因此，本文认为重磁、露头观测的综合应用，起到了相互补充、印证的效果，减少了推断结果的多解性，提升了解释成果的可靠性。为浅覆盖区地质填图、区域构造研究及成矿预测等提供了有效的技术方法支撑。
Abstract:The Keluo area of Nenjiang County, which is situated in the Nenjiang River basin on the eastern slope of northern Da Hinggan Mountains, is a typical shallowly covered area. In this paper, the authors tried to recognize fault structures and analyze their stress mechanism in the area through synthetic techniques of interpretation and deduction on gravity and aeromagnetic data combined with field outcrop survey. Based on verification of the fault structure in the exposed bedrock area, the authors hold that this synthetic method has good effect in acquiring the mechanical properties and activity characteristics of the faults under the shallowly covered area. It is therefore suggested that the synthetic application of gravity-magnetic and outcrop investigation could be mutually corroborated and, with this means, the multi-solution could be reduced, and the reliability of interpretation could be improved. In addition, such a synthetic application can provide an effective technique support for the geological mapping, regional tectonic study and metallogenic prediction in the shallowly covered area.
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Key words:
- Da Hinggan Mountains /
- shallowly covered area /
- fault structure /
- research method
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