| 运用正交函数拟合预测新疆阿舍勒地区块状硫化物矿床 |
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| 引用本文：张愉才,赵昌龙.1995.运用正交函数拟合预测新疆阿舍勒地区块状硫化物矿床[J].地球学报,16(1):69-76. |
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| 中文摘要:新疆阿舍勒块状硫化物铜锌矿床，是一个正在勘探的大型富铜矿床，矿体呈厚大透镜状，具层控特征，矿体和围岩之间密度差较大。地面重力方法，理应是最有效的勘探方法，但是，由于阿舍勒矿区地质构造过分复杂，地下不同深度的多种密度体叠合在一起，往往掩盖了矿体所产生的重力异常。为了解决这个疑难问题，通过研究，选择适当的正交函数去进行拟合，实现目标信息分离，将成矿层位的重力异常从实测重力异常值中分离出来，勾绘出了矿区线状构造成矿带的轮廓，揭示了矿区构造；指出找矿方向，圈出１１个重力异常，根据矿区矿石的最低密度大于围岩最高密度的实事，可以说：“凡有矿的地方必然显示出重力异常”。故使用本方法处理重力资料，在阿舍勒这类矿区，可具直接找矿效果。 |
| 中文关键词:正交函数拟合 块状硫化物矿床 新疆阿舍勒 |
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| Application of Orthogonal Functions Fitting to the Exploration of Massive Sulfide Deposits in Ashele,Xinjiang |
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| Abstract:The large copper-rich deposit in exploring in Ashele,Xinjiang,is a typical vulcanogenic massivesulfide deposit.Thick, large and lenticular orebodics exhibit the stratabound character,and there isappreciable difference in density between orebodies and country rocks.Ground geophysical methods,mainly the gravity method,have been proved to be the most effective methods for the reconnaissanceof hidden massive sulfide deposits,But the Ashele ore district is characterized by complex geologicalstructures. As the gravity effects due to gravitational bodies at different depths and with different den-sities overlaps each other,the gravity anomalies produced by orebodies,particularly by the deep-scatedones, are usually masked.In order to solve the knotty problem,the proper orthogonal functions fitted to the Bougueranomaly can be selected in the ore district,so as to separate the local gravity anomalies due to the orehorizons from the measured anomalies.On that basis,we outlined successfully a tectono-metallogenicbelt,unveiled the structures in the ore district,delineated eleven local gravity anomalies,and chartedthe interested area in ore prospecting.The average densities of the rocks and the ores from table lshows that the minimum density of the ores is higher than the maximum one of the country rocks inthe ore district.Therefore, it may be considered that"wherever there are ores in a area,there isbound to be manifestation of gravity anomaly there",and the gravity data processing by means of themethod can be used in ore prospecting dircctly in such ore districts as Asheic. |
| keywords:orthogonal functions fitting to massive sulfide deposit Ashele Xinjiang |
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