【作者】 李佑国；

【导师】 杨武年；

【作者基本信息】 成都理工大学 ， 地球探测与信息技术， 2007， 博士

【摘要】 位于扬子地台西南缘的攀枝花—西昌地区，历经多期次构造-岩浆活动和变质作用，形成了铜、铜镍铂族、铁钛钒等复杂多样的成矿系统，矿产资源丰富多彩。近年来，随着该区矿业的迅猛发展和矿产资源的不断开发殆尽，新的成矿与找矿理论和找矿方法已成为该区找矿突破的关键。本文采用基于3S技术以矿床地球化学为主要手段的找矿方法，通过多个有关项目的科技攻关，取得以下创新成果与认识：1．首次建立了1：200000统一规范的攀枝花—西昌地区地质、矿产、地球化学、遥感、重力、航磁等数据库。2．通过攀西地区10个含PGE岩体的综合研究，在吸收国外最新的理论和实验资料的基础上，从铂族元素分配系数对岩浆过程的制约关系入手，对Cu-Ni-PGE成矿物质的迁移和聚集过程进行了系统分析，对岩体中铂族元素的富集层位及地球化学指标进行了总结。首次提出在攀西地区存在六种铜镍铂族矿化类型、两种重要的铂族元素富集机制和三条寻找铜镍铂族矿床的重要找矿标志。3．通过对攀西地区6个20万图幅的Cu、Ni、Pt、Pd、Cr、Co、Fe、Ti和V等元素的区域化探原始资料的研究，发现Pt、Pd、Cu、Fe、Ti和V在水系沉积物中的高含量基本上与峨眉山玄武岩的分布区吻合，Cr、Ni和Co的高含量主要受到峨眉山玄武岩的西岩区(盐源岩区)和中岩区(攀西岩区)的控制，这一新认识为区域地球化学背景与异常的划分提供了新的思路。4．基于研究区地球化学背景面为不完全连续曲面的事实，通过将化探衬值技术、EDA技术、数据滤波技术、GIS技术和数据插值技术的系统集成，创造性地研制开发了“子区异常下限衬值滤波法”。该方法有效克服了峨眉山玄武岩地区PGE、Cu、Ni等元素背景特高而前寒武系地层的背景偏低而造成矿化异常难以识别等问题，在攀西地区筛选出一批可供进一步勘查评价的Cu、Ni和PGE地球化学异常。5．基于相似类比原则，提取了与矿化有关的遥感信息和地球物理信息。6．在MAPGIS软件的支持下，采用统计证据加权法并结合专家证据加权法，对研究区内铜矿以及铜镍铂族矿床的找矿远景区进行了预测，筛选出篾丝箩等多处重要找矿靶区。更多还原

【Abstract】 PanZhihua-Xichang area, located in the southwest margin of the Yangtze platform, experienced several stages tectonic-magmatic activities and metamorphism, generating Cu, Ni-Cu-PGE and Fe-V-Ti complex metallogenic system and rich in minerals. Recently, with the rapid development of the mining industry and the consumption of the mineral resources, new metallogennic-prospecting theory and methods used in exploration are the key factors for finding out deposits in this area. Based on the "3S" technique, with the main lithogeochemical indicators, through the several relating research programes, we gain the innovation achievements and judgements:1. We firstly constructe 1: 200000 unified, standard database, including geology, mineral resources, geochemical exploration, remote sensing, gravity force and aeromagnetic data in PanZhihua-Xichang area.2. According to the comprephensive study of the 10 PGE-bearing intrusions in PanZhihua-Xichang area, absorbing the the foreign up-to-date theories and experimental information, the beginning of the restricted relation from partition coeficients for magma of PGE, the systematic analysing the Cu-Ni-PGE metallogenic material’s transportation and concentration process, generalize the position of PGE reefs and lithogeochemical indicators in intrusions. We put forward to the conclution that there are six forms Cu-Ni-PGE mineralization, two important routes for PGE concentration(sulfide saturation) and three important indicator in looking for Ni-Cu-PGE sulfide deposits.Through the research of the six map sheets’ regional original geochemistry data, involving Cu, Ni, Pt, Pd, Cr, Co, Fe, Ti and V elements, we discover that the high content of the Pt, Pd, Cu, Fe, Ni and V in stream sediments agrees with the distribution of the Emeishan basalts. And the high content of the Cr, Co and Ni are mainly controlled by the Emeishan basalts’ west basalt district(Yanyuan basalt district) and the central basalt district(PanZhihua-Xichang basalt district). This new judgement provides us new awareness.4. Based on the fact that the geochemistry background is the discontinuous curved face in researching region, according to the systematic integration of the contrast technique in geochemical exploration, EDA(Exploratory Data Analysis) technique, data filtering technique, GIS and data interpolation technique, we creatively develop a method "subregion contrast filtered through outliers". The method effectively overcome the problems of the super-high background of the PGE, Cu, Ni in the Emeishan basalts area, and the lower background in the Precambrian system stratum. And we screened a series Cu, Ni, PGE’s geochemical anomalies which can be further explored and appraised.5. Based on the principle of the similar analogy, we extract remote sensing information and geophysical information relating to mineralization.6. Supported by the MAPGIS, using Weights of Evidence Method and Expert Weight of Evidence, we predicte the targets of exploration programs of the copper deposit and Ni-Cu-PGE sulfide ores. And we screen Miesiluo etc several important prospecting target areas.更多还原