AMT对火山岩中花岗斑岩侵入体的分辨效果
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- 英文论文题名：AMT Application in Distinguishing Granite Porphyry Intruded in Volcanic Rocks
- 论文作者：籍增贤 ; 李彦龙 ; 曹维起
- 英文论文作者：JI Zeng-xian ; LI Yan-long ; CAO Wei-qi ; Airborne Survey and Remote Sensing Center of Nuclear Industry ; Key Laboratory for Geophysical Exploration Technology Center of Uranium Resource ; Geology Brigade 216 of Nuclear Industry
- 年：2015
- 作者机构：核工业航测遥感中心;铀资源地球物理勘查技术中心(重点实验室);核工业二一六大队;
- 论文关键词：AMT测量 ; 火山岩 ; 花岗斑岩 ; 反演电阻率
- 英文论文关键词：AMT survey ; volcano rocks ; granite porphyry ; inversed resistivity
- 会议召开时间：2015-09-21
- 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第1册（铀矿地质分卷、铀矿冶分卷）
- 语种：中文
- 分类号：P618.2;P631.325
- 学会代码：EGVD
- 会议名称：中国核学会2015年学术年会
- 会议地点：中国四川绵阳
- 主办单位：中国核学会
- 学会名称：中国核学会
- 页数：5
- 文件大小：414k
- 原文格式：O
- 会议级别：全国
摘要
EH-4连续电导率剖面仪是目前国内外较为先进的电磁法仪器,它具有勘探深度大、信息反应直观、设备轻便等优点,该系统在铀资源成矿环境调查中广泛应用。笔者在雪米斯坦火山岩带开展了音频大地电磁测量,通过数据处理和异常提取,对火山岩和花岗斑岩反演电阻率特征进行了对比分析,火山岩、火山碎屑岩一般表现为中低阻电性特征,反演电阻率等值线较为宽缓、梯度较小,相对而言,花岗斑岩侵入体表现为中高阻电性特征,反演电阻率等值线多呈团块状、似层状、透镜状展布,等值线也较为密集、梯度较大。火山岩、花岗斑岩反演电阻率与测井电阻率统计结果具有相同的相对高低关系。根据等值线面貌推断了火山岩、花岗斑岩的展布形态,对花岗斑岩与火山岩接触界面的延伸特征进行了分析,经钻探验证,推断解释结果与地质情况大致吻合。表明在雪米斯坦火山岩带,通过AMT测量用于分辨火山岩带中侵入岩体的展布特征是有效地,AMT测量用于探测侵入岩体隐伏特征是可靠的技术手段。
As the advanced electric-magnetic instrument in the world,EH4 electrical conductivity imaging system has been widely used in environment survey for uranium resources since its advantages of great depth of investigation,intuitive information and easy taking,etc..In this paper,the author makes a comparison between the resistivity inversion of volcano rock and granite porphyry based on data procession and anomaly extracting carried out during the field survey at Snow Millsstein volcano rock band,and concludes that volcano and volcaniclastic rocks are with electrical characteristics of medium and low resistivity,wide and gentle inversion contour,whereas granite porphyry intrusive bodies present high resistivity,with contours more dense and large gradient,in a manner of clumps,stratoid and lenticular.The high and low features for resistivity inversion of volcanic rocks and granite porphyry are in common with the results of resistivity logging.Based on their contour features,the distribution of volcano rocks and granite porphyry are inferred,and the extending characters of interface for the two rocks are analyzed,which have been verified by field drilling,and the results coincide with the geology situation.In a word,AMT can be effectively used for the study of the distribution of intrusive bodies in granite rock band and as a reliable technical measure for surveying their concealed characters.
As the advanced electric-magnetic instrument in the world,EH4 electrical conductivity imaging system has been widely used in environment survey for uranium resources since its advantages of great depth of investigation,intuitive information and easy taking,etc..In this paper,the author makes a comparison between the resistivity inversion of volcano rock and granite porphyry based on data procession and anomaly extracting carried out during the field survey at Snow Millsstein volcano rock band,and concludes that volcano and volcaniclastic rocks are with electrical characteristics of medium and low resistivity,wide and gentle inversion contour,whereas granite porphyry intrusive bodies present high resistivity,with contours more dense and large gradient,in a manner of clumps,stratoid and lenticular.The high and low features for resistivity inversion of volcanic rocks and granite porphyry are in common with the results of resistivity logging.Based on their contour features,the distribution of volcano rocks and granite porphyry are inferred,and the extending characters of interface for the two rocks are analyzed,which have been verified by field drilling,and the results coincide with the geology situation.In a word,AMT can be effectively used for the study of the distribution of intrusive bodies in granite rock band and as a reliable technical measure for surveying their concealed characters.
引文
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