投稿时间：2019-10-27
修订日期：2019-12-05
网络发布日期：2020-02-26
中文摘要:四川甲基卡矿田是中国乃至世界上锂辉石资源量最集中的地区之一，近年来发现的新三号脉（X03）的氧化锂资源量达88.55万吨，是亚洲第一大锂辉石单脉。文章在多年实践工作的基础上，总结了新三号脉（X03）的重力、磁法、电法综合物探特征，发现新三号脉（X03）具有以下综合地球物理特征：①重力成果显示其位于布格重力梯度带、剩余重力低异常区域；②磁法成果显示其位于地磁化极梯度带、磁源重力低异常区域；③电法方面，大功率激电中梯成果显示其位于视电阻率南北向高异常分布区域；测深成果显示其位于浅部视电阻率高异常中，深部分布有规模和强度更大的视电阻率高异常。这些地球物理特征与脉体的规模、埋藏深度、延伸长度等地质特征相一致。同时，野外地质特征发现已知含矿脉体主要呈南北向分布，因此，可将南北向分布的视电阻率高异常区作为下一步勘探的重点。
Abstract:The Jiajika orefield in Sichuan Province is one of the most concentrated areas of spodumene resources in China and even in the world. In recent years, the lithium oxide resources of the X03 pegmatite vein have reached 885,500 tons, suggesting that it is the largest single spodumene vein in Asia. On the basis of many years' practice, this paper systematically summarizes the characteristics of comprehensive geophysical means of the X03 pegmatite vein, such as gravity, magnetic, electrical and audio magnetotelluric methods. It is found that X03 pegmatite vein has the following comprehensive geophysical characteristics:① the gravity results show that it is located in the Bouguer gravity gradient belt and the residual gravity low anomaly area; ② the magnetic results show that it is located in the geomagnetic pole gradient belt and the magnetic source gravity low anomaly area; ③ as for the electrical survey, the high power IP middle ladder results show that it is located in the NS-trending high anomaly distribution area of apparent resistivity; the sounding results show that it is located in the shallow high anomaly area of apparent resistivity, whereas in deep anomaly area, there are more large scale and stronger apparent resistivity anomalies. These geophysical characteristics are consistent with the geological characteristics of the vein body in such aspects as scale, burial depth and extension length. At the same time, it is found that the known ore vein bodies are mainly distributed in the NS direction. Therefore, the high anomaly of apparent resistivity in the NS direction is the focus of the next exploration. The result provides a direction for further prospecting in the deep part of the Jiajika area and lays a theoretical and methodological foundation for geophysics.
keywords:geology X03 pegmatite vein comprehensive geophysical characteristics spodumene deposit Jiajika
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基金项目:本文得到国家深地资源勘查开采专项“甲基卡及外围锂能源金属矿产基地深部探测技术示范课题”（编号：2017YFC0602702）、“川西甲基卡稀有金属矿产资源绿色勘查研究与示范”和“稀有稀土战略资源评价与利用四川省重点实验室”项目联合资助
引用文本：
杨荣,郝雪峰,王登红,范俊波,代鸿章.2020.四川甲基卡锂矿田伟晶岩脉的地球物理探测效果——以新三号脉（X03）为例[J].矿床地质,39(1):111~125YANG Rong,HAO XueFeng,WANG DengHong,FANG JunBo,DAI HongZhang.2020.Effect of geophysical exploration on the pegmatite vein in Jiajika lithium orefield, Sichuan Province: A case study of X03 vein[J].Mineral Deposits39(1):111~125
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