摘要
蒙C-2017-024号航磁异常位于内蒙古阿拉善左旗北西约65 km处,对异常开展了物性参数测量及地面三级查证工作。异常区第四系、古近系磁化率一般为(20～60)×10^(-5)SI,为无磁性或弱磁性体,外围的超基性—基性岩体磁性较强。地面磁测异常幅值最高为78.36 nT,呈椭圆状形态,长约650 m,宽约320 m。反演结果表明异常深部约165 m存在基性岩体,且其内部可能存在强磁性地质体。结合区域地质成矿背景,初步推断异常为构造演化过程中沿断裂侵入的基性岩浆,经后期改造,铁磁性物质沿岩体内部局部断裂、裂隙,迁移富集形成的强磁性地质体所引起。建议对该异常进一步开展查证。
C-2017-024 aeromagnetic anomaly isdistributed in Inner Mongolia Alxa Zuoqiabout 65 km north west.Physical parameter measurement and anomaly investigation were carried out. The susceptibilities are among( 20 ~ 60) ×10-5SI inthe Quaternary and Oligocene of anomaly area which are non-magnetic or weak magnetic substance.Themagnetic performance of ultrabasic rock and basic rock are relative high. The maximum of ground magnetic survey is 78.36 n T,whichwere elliptoid,650 meters long and 320 meters wide.According to the inversion result,there is a basicintrusionin about 165 m deep,and strong magnetic geological bodies may be within it.Combining regional metallogenic background,it preliminarily infered that the anomaly caused by the strong magnetic geological bodies.The activation,migration and enrichment of magnetic materials in the basic intrusion caused by the later tectonic-hydrothermal activity formed the strong magnetic geological bodies.
作者
陈志鹏
石连成
孟祥宝
卢亚运
杨玉勤
CHEN Zhi-peng;SHI Lian-cheng;MENG Xiang-bao;LU Ya-yun;YANG Yu-qin(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002;CNNC Key Laboratory of Uranium Resource Geophysical Exploration Technology,Shijiazhuang 050002)
出处
《矿产勘查》
2018年第11期2159-2163,共5页
Mineral Exploration
基金
中国地质调查局地质调查项目(编号:DD2016006644)资助
关键词
巴彦乌拉山南部
蒙C-2017-024异常
地球物理特征
成因分析
southern part of Bayan Ura mountain
C-2017-024 aeromagnetic anomaly of Inner Mongolia
geophysical characteristics
genetic analysis
