云南省香格里拉市伊隆迈铜多金属矿区物探异常特征

伊隆迈多金属矿位于西南"三江"义敦岛弧的南段东部斑岩成矿带中。以地质勘查资料为依据,通过开展物探工作获得了以下成果:60线长剖面的重力测量在2 780~4 500区间获得了明显的相对低重力异常,推断该区间深部存在隐伏中-酸性岩体;激电中梯扫面工作在测区东西两侧各获得一个北北西向展布的高极化率条带,推断这两个条带与玄武岩和黄铁矿化凝灰岩有关;利用放射性伽马总量测量对平面上石英二长斑岩脉的走向延伸情况进行了推测;利用高密度电法、激电测深及音频大地电磁测深对该区深部的地质特征进行了推测,根据高密度电法工作成果推断,石英二长斑岩在埋深30m范围内产状陡倾略偏南西,闪长玢岩前期侵入灰岩地层并形成较陡的接触面,石英二长斑岩在后期侵位于闪长玢岩与灰岩的接触面。

Geophysical Anomaly Characteristics of Elon Mai Copper Polymetallic Mining Area in Shangrila City of Yunnan Province

Elon Mai polymetallic ore was located in the eastern porphyry metallogenic belt in the southern part of the "Sanjiang" Yidun island-arc,southwest china.Based on the data of geological exploration,the following results were obtained by geophysical prospecting:in the gravity measurement for 60 line long profile,obvious relative low gravity anomaly was obtained in the section of 2780 ~4500,it was inferred that there existed a concealed intermediate acidic rock mass in the deep part of the interval;a high polariz-ability band with NNW trending direction was obtained on the two sides of the measured area in IP inter-mediate gradient sweeping work,it was inferred that the two bands were related to the basalt and pyritiza-tion tuff;the extension condition of quartz monzonite porphyry dyke in the plane was inferred by using the total amount of gamma ray;the geological characteristics of the deep part of the area were inferred by using high-density resistivity method,IP sounding and audio magnetotelluric sounding,according to the results of the high-density electrical method,it was inferred that quartz monzonite porphyry dyke occurrence steep dip slightly southwest in the depth range of 30 m,diorite-porphyrite early intruded into limestone forma-tion and formed a steep contact surface,latterly quartz monzonite porphyry dyke intruded into the contact surface between diorite-porphyrite and limestone.