高精度磁测在攀枝花外围寻找钒钛磁铁矿的效果  

Effects of High-Precision Magnetic Survey Exploring Vanadic Titanomagnetite in Peripheral Panzhihua Area

作　　者：王赛昕[1,2] 颜廷杰[1,2] 左焕成 

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]国土资源部矿产勘查技术指导中心,北京100120 [3]四川省冶金地质勘查院,成都610051

出　　处：《地质科技情报》2017年第3期255-261,共7页Geological Science and Technology Information

基　　金：中国地质调查局项目"矿集区物化探找矿技术应用示范"(12120115037001);"全国危机矿山接替资源找矿项目"(200751068)

摘　　要：攀枝花地区是我国钒钛磁铁矿的主要成矿带,1965年发现至今已经将近半个世纪,其外围是否还有攀枝花式钒钛磁铁矿床一直是人们关注的问题。在完成对攀枝花外围某工区1∶10 000与1∶2 000地面高精度磁测资料解释的基础上,对比了水平总梯度模、解析信号振幅、归一化标准差、倾斜角、θ图等边界识别方法,并圈定了区内辉长岩分布范围;利用视磁化率填图方法获得视磁化率平面分布特征;根据攀枝花式钒钛磁铁矿磁化率与w(TFe)的经验公式,获得了区内w(TFe)分布,得出了该工区含铁辉长岩的范围,该含铁辉长岩是品位较低的钒钛磁铁矿。由精测剖面井地联合反演得出,含矿辉长岩产状北西倾,倾角约60°,呈层状,与地面出露辉长岩体的产状一致。通过上述工作得出,我国西南川滇黔桂四省分布有大约50万km^2晚古生代玄武岩,在该区具有进一步寻找钒钛磁铁矿的远景。Panzhihua region is the primary metallogenie belt of vanadic titanomagnetite in China, in 1965, nearly half a century ago. Interests still remain in whether there are other Panzhihua-type vanadic titano- magnetite ores in its peripheral regions. We completed the interpretation of the 1 ： 10 000 and 1 ： 2 000 ground high-precision magnetic survey in 2007 and 2008 in peripheral Panzhihua. We used some boundary identification methods such as total horizontal derivatives, analytic signal amplitude, normalized standard deviation, tilt-angle, and 0-map to identify the ranges of gabbro, and also used susceptibility mapping method to obtain the level distributions of susceptibility. In addition, based on the empirical formula be- tween susceptibility of Panzhihua-type vanadic titanomagnetite and TFe content, we speculated the distri- bution of TFe content in this region and the ranges of ferrogabbro in Dashanshu mining area. Our work re- veals that the ferrogabbro belongs to the vanadic titanomagnetite, whose grade is lower. The joint inver- sion of surface and borehole magnetic of accurate section indicated that ferrogabbro incline towards north- west about 60° in the form of layers, which is in accordance with the occurrences of outcropped gabbro on the ground. A conclusion can be drawn based on the work mentioned-above that it is perspective to explore vanadic titanomagnetite in about 0.5 million km^2 Late Paleozoic basalts, distributed in four provinces in south-west of China namely Siehuan. Yunnan, Guizhou, and Guangxi.

关 键 词：高精度磁测 钒钛磁铁矿 攀枝花外围地区 视磁化率填图 边界识别 2.5D井地联合反演 

分 类 号：P631.2[天文地球—地质矿产勘探]