A study of tectonic style of the polymetallic ore concentration area in Southern Lhasa terrane——Evidence from deep seismic reflection profile
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摘要:
位于冈底斯成矿带中段的雄村、娘热地区，因近年来不断发现铁、铜等金属矿床，而逐渐被关注。但是由于缺少地球物理资料，该地区地壳精细结构未能取得清楚的认识。针对横过雄村-娘热矿集区130km深地震反射剖面及25km矿集区内部加密反射剖面的数据，进行了层析静校正、能量补偿、去噪、速度分析等数据处理，获得了雄村-娘热矿集区地壳结构的反射图像。结合本区地质资料，对矿集区深部结构进行了解释和推断，揭示了上地壳多条断裂及各类地质现象，认定断裂与岩浆流动上升方向有关，研究结果对矿集区成矿背景的研究具有一定价值。
Abstract:The Niangre and Xiongcun areas in the middle section of the Gangdise metallogenic belt have gradually attracted attention due to the continuous discovery of metal deposits such as iron and copper deposits in recent years. However, due to the lack of sufficient geophysical data, the fine structure of the crust in this area has not been clearly understood, which restricts the study of the ore-forming background of this area. Employing the data of 130km deep seismic reflection profile of the Xiongcun-Niangre ore concentration area and encrypted reflection profile inside 25km of the ore concentration area, the authors carried out data processing of tomographic static correction, denoising, energy compensation and velocity analysis, and obtained the reflection image crustal structure of the Xiongcun-Niangre ore concentration area. Based on the geological data of this area, the authors explained and inferred the deep structure of the ore concentration area, revealed multiple faults in the upper crust and various geological phenomena. It is determined that the fault is related to the direction of the magma flow. The results have certain value for the study of the oreforming background of the ore concentration area.
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致谢: 感谢中石化中南分公司第五物探大队对本次工作的数据采集。
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图 1 深地震反射剖面位置示意图[16]
Figure 1. Regional location of the deep seismic reflection profile
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图 3 层析静校正前后对比
a—静校正前；b—静校正后
Figure 3. Comparison of data before and after tomographic static correction
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图 4 能量补偿前后对比
a—补偿前；b—补偿后
Figure 4. Comparison of data before and after energy compensation
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图 5 声波噪声去除前后对比
a—去除前；b—去除后
Figure 5. Comparison of data before and after acoustic noise removal
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图 6 低频噪声去除前后对比
a—去除前；b—去除后
Figure 6. Comparison of data before and after Low frequency noise removal
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图 10 雄村-娘热矿集区深地震反射叠加剖面
Figure 10. Deep seismic reflection stack profile of Niangre ore concentration area
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图 11 雄村-娘热矿集区深地震反射解译剖面
Figure 11. Deep seismic reflection interpretation profile of Niangre ore concentration area
表 1 深地震反射剖面（130km）采集参数
Table 1 Deep seismic reflection profile(130km)acquisition parameters
类型 道数 放炮方式 排列参数 叠次/次 道距/m 炮距/m 偏移距/m 药量/kg 小炮 720 中间放炮 17975-25-50-25-17975 ≥60 50 250 25 50 中炮 900 17975-25-50-25-17975 1000 192 22475-25-50-25-22475 
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表 2 雄村-娘热矿集区加密段（25km）采集参数
Table 2 Dense section(25km) acquisition parameters of Xiongcun-Niangre ore concentration area
类型 方式 排列参数 叠次/次 道距/m 炮距/m 偏移距/m 药量/kg 浅层单炮 中间放炮 17975-12.5-25(50)-12.5-17975 ≥60 25 100 12.5 16 小炮 17975-12.5-50(25)-12.5-17975 50 250 50 中炮 17975-12.5-50(25)-12.5-17975 (25) 1000 192 22475-12.5-50(25)-12.5-22475
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