Gravity and Magnetic Anomalies and Prospecting Prediction of Iron Polymetallic Deposits in the Downstream of Nalingguole River
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摘要:
那陵郭勒河下游地区以第四系覆盖为主，已发现多个铁多金属矿床，同时受覆盖的影响，找矿工作难度增大。笔者以1∶5万航磁及1∶20万区域重力资料研究分析了那陵郭勒河下游重磁异常的展布特征，推断了研究区的断裂构造；根据南部基岩出露区地层、岩体与重磁场的关系，推断划分了覆盖区下地层及侵入岩的分布情况。结合地质特征与矿产的分布关系，认为中、小型铁多金属矿床分布主要与中部圈定的岩体密切相关，且位于推断岩体的边部，矿（化）点主要分布于推断断裂的附近，受断裂控制明显。圈定找矿靶区2处，为后期柴达木盆地周缘覆盖区（半覆盖区）的找矿及靶区优选提供有利的证据。
Abstract:The downstream area of the Nalingguole river is predominantly covered by Quaternary sediments. Several polymetallic ore deposits, primarily composed of iron, have been discovered in this region. However, the presence of sediment cover has increased the difficulty of prospecting activities. In this study, the author analysied of the distribution characteristics gravity and magnetic anomalies, and inferred the fault structure of the study area in the downstream structures of the Nalingguole river, focusing on 1∶50,000 aeromagnetic anomaly data and 1∶200,000 regional gravity data. Based on the relationship between strata, rock mass, gravity and magnetic field in the southern bedrock outcropping area, deduced and divided the distribution of strata and intrusive rocks under the overlying area. Moreover, the mineral occurrences are predominantly found near inferred fault lines, indicating a clear influence of fault control. Two prospective mining targets were identified, providing favorable evidence for future ore exploration and target selection in the (partially) covered areas surrounding the Qaidam basin.
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表 1 那陵郭勒河下游岩石物性统计表
Table 1. Statistical table of rock physical properties in the downstream in Nalingguole river
大类 代号 岩石名称 数量（块） 磁化率（10−6×4π·SI） 密度（g/cm3） 变化范围 平均值 变化范围 平均值 地层 Q 黏土、砂、砾石 30 1.43～2.24 1.83 C1d 灰岩 19 1.3～5.0 1.9 2.63～2.84 2.76 C1s 复成分岩屑砂岩 5 7.5～8.8 8.8 2.59～2.66 2.61 OQ3 灰岩 94 1.3～719.5 80.1 2.57～2.82 2.73 大理岩 74 18.2～1462.2 379.9 2.56～2.83 2.73 OQ2 大理岩 60 14.2～584.3 90.1 2.43～3.12 2.89 构造角砾岩 17 29.3～255.5 92.4 2.38～2.82 2.58 蚀变安山质玄武岩 50 16.8～888.9 88.2 2.84～3.14 3.02 OQ1 长石石英砂岩 60 37.9～1507.2 151.9 2.52～2.82 2.70 粉砂质板岩 120 2.5～3353.5 28.9 1.72～2.84 2.72 石英质板岩 5 2.5～23.9 15.1 2.69～2.82 2.71 Pt1J 片麻岩 82 3.8～45.2 22.6 2.59～3.07 2.73 侵入岩 正长花岗岩 12 2.5～2800.9 12.3 2.52～2.66 2.61 二长花岗岩 238 5.0～4797.9 348.8 2.54～2.87 2.62 花岗闪长岩 36 110.0～3007.8 783.8 弱磁铁矿化花岗岩 35 526.0～4489.1 2355.7 2.64～2.67 2.65 磁铁矿化花岗岩 40 290.4～6013.8 2556.8 2.65～2.68 2.66 矿石 磁铁矿 54 10209.2～467590.4 76112.0 3.24～4.72 4.17 
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表 2 那陵郭勒河下游地层及侵入岩物性及重磁场特征统计表
Table 2. Statistical table of stratigraphic and intrusive petrophysical and gravity magnetic characteristics in the downstream in Nalingguole river
大类 代号 物性特征 可形成的重磁异常场 出露区重磁异常特征 地层 Q 低密度 重力低异常、负磁异常或无磁异常 东北角重力低异常、宽缓的负磁磁异常 C1d 高密度，低磁化率 重力高异常、负磁异常或无磁异常 重力高异常、正磁异常背景，局部有磁力高和磁力低伴生的磁异常 C1s 低密度，低磁化率 重力低异常、负磁异常或无磁异常 重力低、负磁异常带 OQ 高密度、中低磁化率 重力高异常、整体呈负磁异常或无磁异常，局部有弱磁异常 重力高异常、负磁异常为主，均布由正负伴生的磁异常 Pt1J 高密度、低磁化率 重力高异常、负磁异常或无磁异常 露头处形成重力高及低缓磁异常 侵入岩 低密度、中高磁化率 重力低异常、正磁异常 重力低异常、正磁异常区（西南角） 矿体 高密度、高磁化率 重力高异常、正磁异常 重力场梯级带，偏正异常，磁法正异常
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