四川攀枝花晶质石墨矿电性特征及找矿评价  

Electrical characteristics and prospecting evaluation of Panzhihua crystalline graphite deposit in Sichuan Province

作　　者：杨剑[1] 王桥[1] 王绪本[2] 宁括步 郭镜[1] 周清[1] 高慧[1] YANG Jian;WANG Qiao;WANG Xuben;NING Kuobu;GUO Jing;ZHOU Qing;GAO Hui(Chengdu Center of China Geological Survey,Chengdu 610081,Sichuan,China;Chengdu University of Technology,Chengdu 610059,Sichuan,China)

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081 [2]成都理工大学,四川成都610059

出　　处：《中国地质》2022年第1期284-297,共14页Geology in China

基　　金：中国地质调查局项目(DD20190033);国家自然科学基金(41604118)联合资助。

摘　　要：【研究目的】石墨具有高的电子导电性,电性呈现形式为低阻(<10^(-5)Ω·m)高极化(>40%)特征,正是由于石墨的超低阻特性,在石墨矿地球物理勘查中经常遇到“低阻屏蔽”作用,因此,优选有效的电法勘探组合在石墨矿勘查中非常重要。【研究方法】本文选择四川攀枝花中坝晶质石墨矿开展正演模拟,同时对典型矿床开展自然电位法和宽频电磁法的有效性和适用性分析。【研究结果】遵循“从已知到未知的原则”,利用该方法组合在中坝外围唐家坪石墨矿勘查中取得了较好的应用效果,为该区矿产地评价提供了重要支撑。【结论】自然电位法+宽频大地电磁测深法的组合地球物理方法能够有效圈定石墨矿地表范围及深部延展,为相似地质条件下的石墨矿勘查提供了应用示范。This paper is the result of mineral exploration engineering.[Objective]Graphite,characterized by high electronic conductivity,with low resistivity(<10^(-5)Ω.m)and high polarization(>40%).Due to the ultra-low resistance of graphite,"low resistance shielding"is often encountered in the geophysical exploration.Therefore,it is very important to optimize the effective geophysics methods in graphite exploration.[Methods]In this paper,the Zhongba crystalline graphite deposit in Panzhihua,Sichuan Province is selected for forward simulation,and the effectiveness and applicability of spontaneous potential method and broadband electromagnetic method are analyzed for typical deposits.[Results]Following the principle of"from known to unknown",this method has been successfully applied in the Tangjiaping Graphite exploration,which identified in the periphery of Zhongba deposit.It provides an important support for the mineral evaluation in this area.[Conclusions]we proposed a geophysical methods which synthesized the spontaneous potential method and the broadband magnetotelluric sounding method,which can effectively delineate the graphite orebody extension at surface and underground.At the same time,it provides an application demonstration for graphite exploration under similar geological conditions.

关 键 词：石墨矿 自然电位法 宽频大地电磁法 矿产勘查工程 攀枝花 四川 

分 类 号：P619.252[天文地球—矿床学]