物探方法在青海省口口尔图石墨矿找矿中的应用
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摘要
由于石墨矿具有低电阻高极化的特性,利用自然电位法与激电中梯法相结合的综合物探方法,在口口尔图石墨矿区找矿中取得了非常好的效果。矿区具有自然电位负异常强度较高(Z1异常区最大异常值为-515.4mv,Z2异常区最大异常值为-207mv),视电阻率低的异常特征,自电异常与激电异常(J1～J2)重现性较好,"自电负异常、低阻高极化"是重要的找矿标志。经探矿工程验证,在异常区内发现了3条石墨矿化带(Ⅰ～Ⅲ)、1条晶质石墨工业矿体(M3)、13条晶质石墨低品位矿体(M1～M2,M4～M14),含矿岩性主要为斜长角闪片岩,其次为大理岩,圈定的两类异常与矿体具有很好的对应性,对寻找石墨矿起到了直接指导作用。同时,Ⅱ号石墨矿化带为区内成矿条件最好且规模最大,通过系统的工程控制,有望扩大现有矿体规模,提高矿石资源量级别,具较大的找矿潜力。
Due to the low apparent resistivity and high polarization characteristic of graphite,the two geophysical methods——the spontaneous potential method and IP intermediate gradient had been used and obtained good results in ore-prospecting in Koukouertu graphite ore-field.The Koukouertu graphite mine had the characteristics of high negative abnormal strength of spontaneous potential(Z1 maximum abnormal value was-515.4 mv,Z2 maximum abnormal value was-207 mv)and low apparent resistivity.The reproducibility of spontaneous potential anomaly and IP anomaly(J1-J2)were good.Negative abnormal strength of spontaneous potential and high polarization" is an important prospecting marker.Verified by exploration engineering,we found three graphite mineralization belt(I-III)in abnormal zone,one crystalline graphite industrial orebody(M3),thirteen crystalline graphite low grade orebodies(M1,M2 and M4-M14).The orebearing lithology is mainly plagioclase amphibole schist,followed by marble,and the two types of anomalies delineated have a good correspondence with the orebodies,which plays a direct guiding role in looking for graphite ore.At the same time,the No.II graphite mineralized belt has the best metallogenic conditions and the largest scale,it is expected to expand the scale of existing ore bodies and raise the level of ore resources,the area is an idea prospect target with great potential.
Due to the low apparent resistivity and high polarization characteristic of graphite,the two geophysical methods——the spontaneous potential method and IP intermediate gradient had been used and obtained good results in ore-prospecting in Koukouertu graphite ore-field.The Koukouertu graphite mine had the characteristics of high negative abnormal strength of spontaneous potential(Z1 maximum abnormal value was-515.4 mv,Z2 maximum abnormal value was-207 mv)and low apparent resistivity.The reproducibility of spontaneous potential anomaly and IP anomaly(J1-J2)were good.Negative abnormal strength of spontaneous potential and high polarization" is an important prospecting marker.Verified by exploration engineering,we found three graphite mineralization belt(I-III)in abnormal zone,one crystalline graphite industrial orebody(M3),thirteen crystalline graphite low grade orebodies(M1,M2 and M4-M14).The orebearing lithology is mainly plagioclase amphibole schist,followed by marble,and the two types of anomalies delineated have a good correspondence with the orebodies,which plays a direct guiding role in looking for graphite ore.At the same time,the No.II graphite mineralized belt has the best metallogenic conditions and the largest scale,it is expected to expand the scale of existing ore bodies and raise the level of ore resources,the area is an idea prospect target with great potential.
引文
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[4]杨延景,雷延军,孙森.青海省洪水河东地区晶质石墨矿地质特征及找矿前景浅析[J].青海国土经略,2016(2):73-76.
[5]辛军强,水应东,邵继,等.青海细细特郭勒地区石墨矿床地质特征及潜力分析[J].青海大学学报,2017,35(2):60-66.
[6]李加才让,刘江峰,关全成,等.青海省东昆仑口口尔图地区地球化学特征及找矿方向探讨[J].电子测试,2013(24):214-258.
[7]辛军强,杨延景,赵生辉,等.青海洪水河东地区石墨矿床地质特征及成因探讨[J].青海大学学报(自然科学版),2015,33(6):81-84.
[8]赵生辉,张宇宏,孙岩,等.青海省格尔木市口口尔图地区石墨矿预查报告[R].西宁:青海省核工业地质局,2017.
[9]李勇,张永恒,王红军,等.四川省南江县庙坪石墨矿深部找矿的综合物探方法[J].现代矿业,2018,34(1):111-116.
[10]孙萍.自然电场法在寻找金属矿与石墨矿中的应用[J].中国金属通报,2017(7):188-189.
[11]李海宾,卿晓锋,祁昌炜,等.自然电场法在青海省三通沟石墨矿找矿中的应用[J].地质与资源,2016,25(6):580-582.
[12]卿晓锋,倪云鹏,李富龙.自然电场法与激电法在找矿中的应用[J].中国西部科技,2014,13(4):27-54.
[13]谢志峰,张翔.炭质地层覆盖区综合物探方法寻找隐伏矿床[J].物探与化探,2010,34(4):448-453.
[14]齐新国,甄贵月,吴正伟.物探电法测量在龙关一带石墨资源调查评价中的应用[J].中国非金属矿工业导刊,2008,67(2):63-64.
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