| 吴真玮.基于重磁场特征的松辽盆地基底岩性研究[J].地质与勘探,2015,51(5):939-945 |
| 基于重磁场特征的松辽盆地基底岩性研究 |
| Distribution of basement lithology in the Songliao basin derived from gravity and magnetic anomalies |
| 投稿时间：2015-01-01 修订日期：2015-05-12 |
| DOI： |
| 中文关键词: 地热 重磁异常 松辽盆地 基底岩性 火山岩 |
| 英文关键词: geothermal energy, gravity and magnetic anomaly, Songliao basin, basement lithology, igneous rock |
| 基金项目:国家863项目（2012AA052801）和博士点基金项目（20130061110060）联合资助。 |
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| 摘要点击次数: 2071 |
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| 中文摘要: |
| 盆地的基底岩性分布与地热资源有密切关系。基于松辽盆地的重磁场异常，利用最佳向上延拓的方法进行场源分离，提取了基底的重磁异常特征；结合岩石物理性质，重、磁异常相关性以及地质数据，推测了松辽盆地的基底岩性分布。基底以变质岩和火成岩的为主，形成年代分为加里东期、海西期、印支期和燕山期。加里东期和海西期火成岩的年代较老，印支期和燕山期火成岩相对较年轻。印支期和燕山期火成岩分布于盆地中部和东部，海西期火成岩的分布在中部和西部。加里东期花岗岩少量分布于盆地的西部。火山岩的展布受基底断裂影响。火成岩岩体的走向与盆地边界与盆地内部的断裂带平行，基底断裂带岩浆的活动，与基底岩性的分布存在密切的关系。这些特征为盆地地热资源远景评价和开发利用提供了依据。 |
| 英文摘要: |
| The basement burial depth, lithology and fault distribution of a basin are closely related to geothermal resources. Based on the characteristics of gravity and magnetic anomalies, using the preferential upward continuation method, this work has separated the fields and sources of gravity and magnetism, and extracted the gravity and magnetic anomalies of the basement in the Songliao basin. Combining physical properties of rocks, correlation between gravity and magnetic anomalies as well as geological data, this work has further inferred the lithological distribution of the basement in the Songliao basin. Metamorphic and igneous rocks dominate the basin basement, which were formed in the Caledonian, Hercynian, Indosinian, and Yanshanian periods. The rocks of former two ages are relatively older, while those of the latter are younger. The Indosinian and Yanshanian igneous rocks are distributed in the central and eastern basin, Hercynian rocks in the middle and west, and few Caledonian granites in the west. Their patterns are controlled by faults in the basement. Strikes of these rock bodies tend to be parallel to the basin boundaries and faults within the basin. Magma activities along faults of the basement likely determined the distribution of the lithology. These data will provide evidence for prospect assessment and development of geothermal resources in the basin. |
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