北衙金—多金属矿成矿系列与综合信息成矿预测

【作者】 陈爱兵；

【导师】 秦德先；

【作者基本信息】 昆明理工大学 ， 矿产普查与勘探， 2005， 博士

【摘要】 本博士论文“北衙金—多金属矿成矿系列与综合信息成矿预测”是结合云南省科技攻关计划(工业及高新技术部分)“矿产资源商业性数字化快速评价示范”(项目编号:2003GG01)的科研需要而选题的。 改革开放以来,随着经济的飞速发展,我国对矿产资源的需求与日俱增,而目前我们国家各主要矿种的资源保证程度相当低,矿产资源的形势非常严峻,严重威胁着国家的经济安全和社会稳定。为了改变这种形势,我们必须依赖于科技进步,积极探索新的、更有效的现代成矿预测理论与高新技术有机结合的矿产资源预测体系,整体提升我国矿产资源勘查评价水平和科学预测能力,寻找和发现新的矿产资源品种和类型,增加矿产资源的储备,为我国经济安全、高效、持续发展提供资源保证。 本博士论文结合课题的研究需要,瞄准我国矿业和地质勘探行业发展的前沿,在北衙成矿区采用成矿系列理论和综合信息成矿预测的方法相结合,在计算机及高新技术(GIS和矿业专用软件)支持下,开展了综合信息成矿预测研究。 在对前人研究成果的充分借鉴和吸收的前提下,我们开展了广泛的野外及井下地质调查和室内的综合研究工作,主要包括矿床的宏观和微观地质特征研究、典型矿床的解剖、各种同位素资料的综合研究、矿床物质来源和成矿时代的分析、矿床成矿系列和矿床类型的厘定及成因模式的探讨、矿床地物化多源地学信息特征的分析和综合信息找矿模型的研究、控矿因素和找矿标志的分析、基于GIS空间分析的综合信息成矿预测研究、基于数字矿床的矿床深边部成矿预测研究等,通过上述研究主要得到以下成果: (1) 把成矿系列理论引入到北衙金—多金属成矿区,在罗君烈、葛亮胜等划分的滇西北地区与喜山期富碱岩浆活动有关的金矿成矿系列基础上,将北衙成矿区内矿床划分为喜山早-中期岩浆热液Au-Pb-Zn-Fe-Cu成矿亚系列和喜山中-晚期表生成矿亚系列两大矿床亚系列和接触带矽卡岩型金-多金属硫化物矿床、隐爆角砾岩筒型含金铁矿床、脉状及似层状热液充填型含铁金矿床、斑岩型含金铜矿床、河-湖沉积型金矿、古溶洞沉积型金矿和红土型金矿七种矿床类型(式)。 (2) 在成矿系列理论的指导下,根据研究区地层、岩体和矿床的宏观和微观资料的综合分析研究,总结了北衙金—多金属矿的成矿系列成因模式:北衙与富碱斑岩有关的金—多金属矿床具有成岩成矿多阶段,形成矿种多的特点。总体而言,经历了两期成更多还原

【Abstract】 The doctorate dissertation title of The Metallogenic Series and The Comprehensive Information Metallogenic Targeting In Beiya Gold-polymetallic Deposit is selected based on the science and technology pilot projects(Industry and High-tech) of Yunnan province "The commercial and digitized rapid evaluation and demonstration of mineral resource"(Project Code:2003GG01).Since the reforming and opening to the outside world, with the rapid development of economy, it is growing day by day in demanding for mineral resource in our country, but the resource guarantee degree of major kinds of minerals resources in our country is quite low, and the supply situation of mineral resource is very severe, so it has already severely threatened the economical security and the social stabilization of our country. To change this situation, we must depend on the improvement and advance of the progress in science and technology, and research actively and find out the new and more effective mineral resource prognosis system combining the modern metallogenic prognosis theories and high-tech, to advance whole the level of the mineral resource survey and resources estimation and the ability of scientific prognosis of our country, to search and find alternative mineral resource varieties, to increase the reserve of mineral resource, to provide the sufficient resource guarantee for the secure, highly effective and continual economical development of our country.On the basis of the demand of the project, to aim at the frontier of the mineral industry and the geological survey industry of our country, to adopt the theory of Metallogenic Series and the method of the comprehensive information matallogenic prognosis and the computer and the high-tech (GIS and the special software of the mineral industry), it has been carried out h the research of the comprehensive information matallogenic prognosis in Beiya Gold-polymetallic Deposit.In the premise of the full reference and absorption of the previous research results, we has developed the widespread field and underground geological investigation and the indoor synthetic research work, mainly including: the macroscopic and the microscopic geological features research of deposits, the compelete analysis over typical deposits, the syntheticresearch of all kinds of isotope data, the material source of deposits and the metallogenic epoch analysis, the determination of metallogenic series and the deposit types and the discussion on the genetic model of deposits, the analysis of the geological, geophysical and geochemical characters of deposits and the study on the comprehensive information prospecting model, the analysis of the factors of control mineralization and the prospecting criteria, the study on the comprehensive information metallogenic prospecting based on the GIS-based spatial analysis, the research of the prospecting of the deep and surrounding area of the deposit based on the digitized deposit and so on, it is reached the following conclusions:(1) We introduce the metallogenic series theory to the Beiya gold-polymetallic deposit. On the basis of the gold metallogenic series related the alkali magmatic activity in Yunnan northwest area, proposed by Mr Luojunlie and Geliangsheng, we categorize two metallogenic sub-series: the magma hydrothermal Au-Pb-Zn-Fe-Cu metallogenic sub-series in early and middle Himalayan stage and the epigenetic metallogenic sub-series in middle and late Himalayan stage and seven kinds of the deposit type: the Gold-polymetallic sulfide Deposits of the contact metasomatic and skarn type, the gold-bearing iron deposit of the cryptoexplosive breccia pipe type, the vein and stratoid iron-bearing gold deposit ,the gold-bearing copper porphyric deposit, the gold deposit of river and lake sedimentat, the gold deposit of the palaeocaves sediment and the lateritic gold deposit.(2)Under the Metallogenic series theory instruction, according to the studies of the strata, the porphyric intrusion bodies and the deposit in the study area and the comprehensive analysis of the macroscopic and microscopic datum, the genetic model of Beiya Gold-polymetallic Deposit Metallogenic series is summarized. It is concluded as follows:The alkali-enriched porphyry-related gold-polymetallic deposit of Beiya have such characteristics as various matter source, the multi-stages of lithogeny and mineralization, the variety of ore types. In general, it has been experienced two mineralization stages and constitute two sub-series deposits. The main mineralizing matter originated from the magma, the mineralizing and lithogenic process is closely correlated. The mineralizing process come from the formation and evolvement of the magma. Crust movement and fault play the major rules in the formation of the mineral resources and lead ore;The intrusivealkaline-enriched porphyry bodies and the correlation magma is rich in the mineralization element, and provided the rich ore fluid and the heat source for the mineralization;When the mineralization parent rocks intruded into the near surface, because periphery the pressure suddenly drop, form cryptoexplosive breccia and its mineralization, in addition, the enclosing rock is the carbonate rock, and its chemical character is active, to provide good chemical environment for the deposition of ore fluid, so formed the skarn gold-polymetallic deposit, with the temperature continual drop, the rock body contact zone contract and form the crevasse, in the hydrothermal metal sediment along the crevasse of the rock body and the enclosing rock, to form the porphyry and the Gold-polymetallic deposits of the vein and stratoid. After the primary gold mineralizing bodies form, the sulfide had the secondary oxidizing enrichment after the later period intense oxidation and transformation to form the industry gold-polymetallic deposits.(3)On the basis of the abundant analysis and research in the polysource geological, geophysical and geochemical information, we sum up the comprehensive information prospecting prognosis model in Beiya ore area to provide the evidences for the metallogenic prognosis(4) Under the comprehensive information prospecting model of Beiya gold-polymetallic deposits instruction, and link the analysis of the control ore factor and the prospecting symbols, to adopt the spatial analysis function of GIS, has been carried out on the comprehensive information metallogenic prognosis to the ore area and periphery, and proposed six prospecting targets of two sub-series and divided three ranks, i.e. the sub-series I deposits prospecting target is main Xiaomidi target(I-l), Hongnitang target(I-2),Wandongshan eastnorth target(II-l) and Bijiashan-Guogaishan target(II-2), Beiya gold mine department -Weiganpo target(III-l);Sub-series II deposits prospecting target is main Ergongqu-Jingouba target(III-2),Xiaomidi target(I-l),Hongnitang target southeast(I-2), and Beiya gold mine department-Weiganpo target(III-l)southwest namely Beiya gold mine department, to forecast to add the gold resource extent(334)14408.72kg of the sub-series II, provided the scientific evidences for the mine next step of geology prospecting and the resources appraisal work.(5) On the basis of the digitized deposit model and analysis of the mineralizing isoline, Wfe,carried out the research of the metallogenic prognosis in the surrounding area and depth of the deposit, proposed the prospecting target of the elevation 1650m to seek KT52 ore body along the Fll break extend, forecast to add the gold resource extent(332) 983.39kg,not only is one beneficial exploration of the geological statistics theory and the digitized deposit in metallogenic prognosis aspect, also provided the clue for the prospecting in the mine depth.更多还原