西藏荣那斑岩铜矿地质地球物理特征及找矿意义

发布时间：2019-02-13 00:14

【摘要】：荣那铜矿床位于西藏班怒西段多龙斑岩铜矿集区,以往1∶50000磁法和水系沉积物测量已经显示出荣那异常带具有寻找隐伏斑岩铜矿的潜力.为进一步查明该异常区的异常源属性和铜矿地质特征,对以往地质、物探等资料进行了综合研究,并投入了大比例尺磁法和电法测量等物探工作;在优选区内成矿有利部位的基础上,利用钻探施工进行异常查证.区内物探工作将荣那异常带进一步分解为两个次级异常区:在荣那异常区中心呈现低磁、低阻、高极化异常有利成矿区块,在荣那外围异常区呈现环状高磁、高阻、低极化异常环带.进一步在荣那异常区布设两条激电测深剖面,约150 m以深呈现钟状陡峭的低阻高极化异常.通过对该异常进行综合分析,在荣那异常区选定成矿有利部位施工ZK3204钻孔,86.83~1067.6 m进尺处揭露厚大铜矿体,连续穿矿厚度980.77 m,铜平均品位0.69%.矿体呈巨厚橄榄球状,矿石类型为黄铜矿、辉铜矿化、斑铜矿、黄铁矿化浸染状铜矿石.截止2015年末,探获332+333+334级别铜金属量1097.92万吨,平均品位0.53%.荣那铜矿勘查工作表明,该物探异常是由隐伏铜矿体引起,铜矿类型属斑岩型.阿里地区的铜矿勘查工作表明,青藏高原等高海拔地区高精度磁法和激电测量是经济有效快速圈定靶区的铜矿勘查手段.
[Abstract]:The Rongna copper deposit is located in the Dulong porphyry copper deposit area of Bannuxi section, Tibet. The previous 1: 50000 magnetic method and hydrographic sediment survey have shown that the Rongna anomaly zone has the potential to search for concealed porphyry copper deposits. In order to further find out the anomalous source attribute and the geological characteristics of copper mine in this anomalous area, the previous geological and geophysical exploration data are studied synthetically, and the geophysical exploration work such as large scale magnetic method and electric method is put into work. On the basis of favorable ore-forming position, drilling construction is used to verify anomaly. The geophysical work in the area further decomposed the Jona anomaly into two sub-anomalous areas: low magnetic, low resistivity and high polarization anomalies in the center of the Yonna anomaly area are favorable to the ore-forming block, and the ring high magnetic field and high resistivity are present in the outer anomalous area of Rongna. Low polarization anomaly band. Further, two IP sounding profiles are arranged in the Yonna anomaly area, which is about 150 m deep and presents a bell-like steep low resistivity and high polarization anomaly. Through the comprehensive analysis of the anomaly, the ZK3204 borehole is constructed in the favorable part of ore-forming in Rongna anomaly area, and the thick copper body is exposed at 86.83 ~ 1067.6 m, with a continuous penetration thickness of 980.77 m and an average copper grade of 0.69 m. The ore body is very thick rugby, and the ore types are chalcopyrite, macerite, and pyrite disseminated copper ore. By the end of 2015, 332,333,334 grades of copper had been detected by 10.9792 million tons, with an average grade of 0.53. The prospecting work of Rongna Copper Mine shows that the geophysical anomaly is caused by the concealed copper deposit, and the copper deposit type belongs to porphyry type. The copper exploration work in Ali area shows that high-precision magnetic method and IP survey in high altitude areas such as the Qinghai-Tibet Plateau are economic, effective and rapid means to delineate the target area of copper ore exploration.
【作者单位】：中铝矿产资源有限公司;中国铝业公司;西藏地勘局地质五队;中铝西藏矿业有限公司;
【基金】：中国铝业公司科技发展基金重点项目(2011KJZD09)资助
【分类号】：P618.41

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