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| The high-precision magnetic anomaly characteristics and prospecting forecast in Xunhua region of Qinghai |
Mei-Ding WANG1, Jian-Qing MA2( ) |
1. Geophysical and Geochemical Exploration Corporation, Bureau of Geological Exploration for Nonferrous Metals in Northwest China, Xi'an 710068,China
2. School of Geological Engineering and Surveying, Chang'an University, Xi'an 710054,China |
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Abstract Xunhua region of Qinghai is located in the joints of the Qilian orogenic belt and the west Qinling orogenic belt. In order to reveal the structural feature, and determine the key metallogenic prospect areas, the 150 000 high precision magnetic survey was carried out in the selected area. The azimuth of survey lines is north east to 30°, 391 pieces rock (mineral) magnetic specimens were cellected. through the analysis of the magnetic parameters, characteristics analysis and interpretation of magnetic anomaly, the ZongWuLong-tianshui thrust fault F1 towards NW50°. The key metallogenic prospect areas are mainly distributed in the northeast of the surveyed area, by caledonian period intrusive mass of JiShiShan ultrabasic diorite and LeiJiShan basite granite, and have high mineral content. This work shows that the high-precision magnetic survey is one of the important basic methods in regional geological survey and mineral survey, provides geophysical basis for the next step of mineral survey in the investigated area.
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Received: 12 May 2017
Published: 04 June 2018
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| 岩矿石名称 | 测定块数 | κ/(4π×10-5SI) | Mr/(10-3A/m) | | 变化范围 | 平均值 | 变化范围 | 平均值 | | 变粒岩 | 9 | 48.85~2655.12 | 987.94 | 5.94~473.15 | 138.13 | | 变玄武岩 | 7 | 79.58~1440.55 | 576.49 | 17.18~149.72 | 56.4 | | 变英安岩 | 5 | 105.78~525.08 | 228.04 | 23.58~289.51 | 89.81 | | 玢岩 | 2 | 17.07~109.92 | 63.5 | 35.44~44.32 | 39.88 | | 大理岩 | 2 | 34.86~49.82 | 42.34 | 9.14~40.08 | 24.61 | | 二长花岗岩 | 12 | 21.14~320.11 | 90.69 | 21.07~330.89 | 56.7 | | 粉砂质板岩 | 12 | 22.64~212.18 | 97.45 | 9.03~91.54 | 37.09 | | 灰岩 | 18 | 29.04~230.75 | 81.26 | 7.77~201.87 | 40.89 | | 花岗闪长岩 | 48 | 7.59~1230.3 | 187.73 | 2.99~505.93 | 88.66 | | 辉绿岩 | 7 | 92.55~7450.87 | 1863.41 | 48.26~540.67 | 160.85 | | 辉石岩 | 13 | 22.54~7028.25 | 1597.27 | 7.22~1110.1 | 285.27 | | 辉长闪长岩 | 14 | 72.6~5184.95 | 1721.69 | 12.22~7905.13 | 1528.57 | | 辉长岩 | 17 | 41.0~3506.9 | 856.95 | 16.12~4183.18 | 387.94 | | 钾长花岗岩 | 10 | 19.94~178.21 | 81.27 | 5.87~89.88 | 28.05 | | 砾岩 | 4 | 27.38~44.7 | 51.3 | 9.04~18.29 | 14.11 | | 砂岩 | 91 | 10.12~4417.4 | 136.17 | 1.68~265.9 | 33.64 | | 闪长岩 | 51 | 6.34~3214.76 | 684.03 | 10.07~7965.5 | 346.34 | | 石英砂岩 | 8 | 21.38~166.9 | 55.79 | 10.39~325.45 | 58.47 | | 石英闪长岩 | 12 | 77.53~1839.16 | 487.16 | 35.5~663.64 | 235.46 | | 似斑状二长花岗岩 | 8 | 27.37~99.76 | 58.24 | 9.24~20.9 | 17 | | 斜长角闪岩 | 36 | 20.37~1531.5 | 199.62 | 7~1871.96 | 92.4 | | 长石石英砂岩 | 3 | 36.33~101.03 | 61.75 | 8.3~35.62 | 21.06 |
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