甘肃怪石山铜镍矿化基性超基性岩成矿潜力研究  

METALLOGENIC POTENTIALITY OF GUAISHISHAN CU-NI MINERALIZED BASIC-ULTRABASIC ROCKS IN BEISHAN AREA,GANSU PROVINCE

作　　者：王立社[1] 杨建国 谢春林 王育习 雷永孝 曹红霞[1] 杨鹏飞 齐亚林[3] 

机构地区：[1]西北大学大陆动力学教育部重点实验室,陕西西安710069 [2]西安地质调查中心,陕西西安710054 [3]长庆油田研究院,陕西西安710021

出　　处：《大地构造与成矿学》2008年第3期392-399,共8页Geotectonica et Metallogenia

基　　金：中国地质地调查局战略性矿产远景调查项目(K47E015001;K47E016001);中央地质勘查基金2007年度地质矿产勘查项目(2007651139).

摘　　要：为了研究甘肃北山怪石山含铜镍硫化物基性、超基性岩的成矿潜力，通过野外调查和室内综合对比研究，取得如下认识及成果：（1）怪石山岩体是由橄榄二辉岩、橄榄方辉岩、辉石岩、辉长岩等组成的复式岩体，岩相分异较复杂明显，橄榄二辉岩全岩铜镍矿化（Cu含量0．1％-0．24％，Ni含量0．12％-0．47％）；（2）岩体常量和微量元素具岛弧基性超基性岩浆特征（例如岩体亏损高场强元素Nb、Ta、Ti、Hf及Y和P，富集大离子亲石元素Ba、Rb、Th、U、K及La等）；（3）磁法异常与岩体地表矿化一致，电法结果显示岩体深部矿化更好（最大磁场强度值1210．9nT，南西侧视极化率（ηs）显示最大值可达9．55％，异常范围500m×200m）；（4）岩体岩石地球化学特征与金川、哈拉通克、红旗岭等相似，与甘肃黑山一致。因此，怪石山有望成为储量规模不亚于甘肃黑山的铜镍硫化物矿床。此外，本文还提出了有关北山地区基性、超基性岩铜镍硫化物矿床的几点找矿标志。In order to research the metallogenic potentiality of Cu-Ni sulfide for the Guaishishan bas rocks in Beishan area, Gansu, field investigation and indoor research has been carried out and the could be summarized as follows ： 1 ） The Guaishishan rock body is a complex which is composed of oliv c-uhrabasic conclusions ne websterites, olivine orthopyroxenites,pyroxenites and gabbros. The olivine websterites are mineralized with Cu （0.1% -0.24% ） and Ni （0. 12% -0.47% ）. 2） The major and trace elements of the rocks have the characteristics of island arc ultrabasic rocks, such as low Nb, Ta, Ti, Hf, Y, P but higher Ba, Rb, Th, U, K, La contents. 3 ） The anomaly extensions for electromagnetism fits mineralized rocks on the surface and show that there are more mineralized bodies in the depth （the maximum intensity of magnetic filed is up to 1210.96nT; the highest electric polarization is up to 9.55 % , anomaly area is 500m ×200m）. 4） Rock geochemical characteristics of the Guaishishan body are similar to those of the Jinchuan, Halatongke, Hongqiling deposits,and especially identical to those of Heishan deposits. Thus, mineral reserves of the Guaishishan Cu-Ni sulfide deposit may be more than that in the Heishan （Gansu）. Besides, some clues for Cu-Ni sulfide deposit prospecting in the Beishan area has been put forward.

关 键 词：铜镍硫化物 基性超基性岩 北山 甘肃 

分 类 号：P595[天文地球—地球化学] P622[天文地球—地质学]