巴彦乌拉山南部蒙C-2017-024地球物理特征及成因分析
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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~(-5)SI 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.
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~(-5)SI 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.
引文
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邓耀辉.2016.剩余磁化强度影响下磁异常特征研究[D].成都:成都理工大学.
冯志兴,李红宇.2002.内蒙古阿左旗巴彦乌拉山成矿带地质特征及控矿条件浅析[J].矿产与地质,16(1):9-12.
黄金明.重磁数据处理解释技术在华南地区岩体圈定与形态反演中的应用研究[R].北京:中国地质大学(北京).
姬海军,何大鹏,何佳军.2017.武腾盆地及邻区铀矿资源远景调查[R].咸阳:核工业203研究所.
李佳.2015.巴彦乌拉山深变质岩区韧性剪切带特征与金矿成因[J].矿物学报,482.
李文国,李庆富,姜万德,等.1996.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社.
毛景文,周振华,武广,等.2013.内蒙古及邻区矿床成矿规律与成矿系列[J].矿床地质,32(4):715-729.
内蒙古地矿局.1986.内蒙古自治区区域地质志[M].北京:地质出版社.
潘桂棠,肖庆辉,陆松年,等.2009.中国大地构造单元划分[J].中国地质,36(1):1-28.
汤锡元,冯乔,李道燧.1990.内蒙古西部巴彦浩特盆地的构造特征及其演化[J].石油与天然气地质,11(2):127-135.
杨玉勤,张翔,石连成.2018.内蒙古阿拉善左旗地区1∶5万航空物探(磁、放)调查项目成果报告[R].石家庄:核工业航测遥感.
张世晖,刘天佑,顾汉明,等.2003.巴彦浩特盆地火成岩的综合地球物理解释[J].物探与化探,10(5):383-386.
周怀鲲,瑞凯.内蒙古自治区阿拉善左旗巴彦乌拉山北部岩金矿成矿地质特征及成因初探[J].西部资源,139-141.