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Using electrogeochemical approach to explore buried gold deposits in an alpine meadow-covered area

Acta Geochimica 2018年第3期37卷 402-413页

作者： Panfeng Liu xianrong luo Meilan Wen Jiali Zhang Wen Gao Fei Ouyang Xuchuan Duan Earth Sciences of Guilin University of Technology Guilin 541006 China Research Institute of Prediction of Hidden Deposits Guilin University of Technology Guilin 541006 China

Exploration for buried gold ores and other deeply buried ores, especially in high altitude localities, is one of the tough challenges facing the geological world *** and efficient ore prospecting methods are badly needed to deal with the situation. This paper documents a test that, for the first time, uses an electrogeochemical approach to prospect ores in the alpine meadow-covered Bangzhuoma area and its periphery in Qinghai–Tibet *** results were compared with conventional soil measurements from a 2 D prospection, and an ideal model of electrogeochemical anomaly formation in the area was established based on the comparison in order to provide theoretical guidance to buried ore prospecting in areas with similar conditions. The research shows that:(1) For exploration of deeply-buried mineral deposits, an electrogeochemical approach is better than soil measurements in terms of correspondence between element content values and anomaly forms and spatial distribution of known deposits in sections. Anomalies of high to low temperature element associations(Bi–Mo; Au–Ag–As–Bi and Au–Ag)and clear zonation were also observed along vertical vein runs in the sections. Based on integration of the observation with geological characteristics of the sections, we propose to use Au, Ag and As as the electrogeochemical indicators and Bi and Mo as the electrogeochemical tracing elementsto guide further analysis.(2) Judging from element statistics and the scale, intensity, and range of anomalies in plan maps, we found that an electrogeochemical approach is less affected by topography and secondary actions. The plan maps also show that elemental differentiation coefficients of the study area are in an ascending order of Ag(0.67) \ Mo(0.85) \ Bi(0.97) \ Au(1.51) \ As(2.35),better representing the element distribution in the area and yielding more striking and concentrated anomalies for known deposits than that of the soil measurements. Apart from that, electrogeochemical a

关键词： Electrogeochemistry Buried mineral deposit Ideal anomaly model Alpine-meadow covered Ihunze

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A geochronological and geochemical study on the granodiorite porphyry and its implication for the mineralization in the Dayaoshan metallogenic belt,Southeastern China

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Acta Geochimica 2021年第1期40卷 106-122页

作者： Panfeng Liu Jiali Zhang Zhiqiang Wu Qingwei Zhang Meilan Wen xianrong luo Chaojie Zheng Wenbin Huang College of Earth Science Guilin University of TechnologyGuilin 541006China College of Environmental Science and Engineering Guilin University of TechnologyGuilin 541006China

A systematic study combining U-Pb zircon dating,lithogeochemical and Sr-Nd isotopic analyses was carried out upon the Xinping granodiorite porphyry in the Dayaoshan metallogenic belt to understand its petrogenesis and tectonic ***-ICP-MS U-Pb zircon dating yielded a 442.7±5.8 Ma age,indicating that the granodiorite porphyry was emplaced during the Llandovery Silurian of the Early *** granodiorite porphyry shares the same geochemical characteristics such as Eu negative anomaly as other syn-tectonic granite plutons in the region,including the granodiorite porphyry in Dawangding and granite porphyries in the Dali Cu-Mo deposit and Longtoushang old deposit,indicating a similar magma evolution *** Xinping granodiorite porphyry has high contents of SiO2(67.871.8%)and K2O(1.78-3.42%)and is metaluminous-peraluminous with A/CNK ratios ranging from 0.97 to 1.06,indicative of high-potassium calc-alkaline to calc-alkaline *** is a I-type granite enriched in large ion lithophile elements Rb,Sr,while depleted in Ba and high field-strength element ***,a collision between the Yunkai Block from the south and the Guangxi Yunnan-North Vietnam Block from the north during the Early Paleozoic was followed by uplifting of the Dayaoshan *** Xinping granodiorite porphyry was likely emplaced during the ***-Nd isotopic analyses show that the granodiorite porphyry has initial 87Sr/86Sr ratios(Isr)of 0.7080-0.7104,εNd(t)range from-0.08 to-4.09,and t2DM between 1.19 and 1.51 Ga,well within the north-east low-value zone of the Cathaysia block,indicating a Paleoproterozoic Cathaysia basement source and an involvement of under plating mantle *** observations,geochronological data,and 3D spatial distribution all lead to the conclusion that the Early Paleozoic Xinping granodiorite porphyry does not have any metallogenic and temporal relationships with the Xinping gold deposit(which has a Jurassic-Early Cretaceous age based on

关键词： U–Pb zircon geochronology Lithogeochemistry Sr–Nd isotopes Granodiorite porphyry The Dayaoshan metallogenic belt

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On the role of buoyancy force in the ore genesis of SEDEX deposits:Example from Northern Australia

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Science China Earth Sciences 2009年第5期52卷 452-460页

作者： YANG JianWen FENG ZuoHai luo xianrong CHEN YuanRong Department of Resources and Environmental Engineering Guilin University of TechnologyGuilin 541004China Department of Earth and Environmental Sciences University of WindsorOntario N9B 3P4Canada

Finite element modeling on a highly conceptualized 2-D model of fluid flow and heat transport is undertaken to simulate the paleo-hydrological system as if the Mount Isa deposits were being formed in the Mount Isa basin, Northern Australia, and to evaluate the potential of buoyancy force in driving basin-scale fluid flow for the formation of sedimentary-exhalative (SEDEX) deposits. Our numerical case studies indicate that buoyancy-driven fluid flow is controlled mainly by the fault penetration depth and its spatial relation with the aquifer. Marine water recharges the basin via one fault and flows through the aquifer where it is heated from below. The heated metalliferous fluid discharges to the basin floor via the other fault. The venting fluid temperatures are computed to be in the range of 115 to 160°C, with fluid velocities of 2.6 to 4.1 m/year over a period of 1 Ma. These conditions are suitable for the formation of a Mount Isa-sized zinc deposit, provided a suitable chemical trap environment is present. Buoyancy force is therefore a viable driving mechanism for basin-scale ore-forming hydrothermal fluid migration, and it is strong enough to lead to the genesis of supergiant SEDEX deposits like the Mount Isa deposit, Northern Australia.

关键词： hydrothermal fluid flow finite element modeling SEDEX deposits Mount Isa basin

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甘肃白银市银硐沟铜锌矿多元信息找矿预测

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矿产与地质 2024年第3期38卷 527-533页

作者：舒立霞曹中煌华二叶聪林邹璇罗先熔中国地质大学出版社湖北武汉430074 中国冶金地质总局中南地质调查院湖北武汉430081 武钢资源集团大冶铁矿有限公司湖北黄石435000 桂林理工大学隐伏矿床预测研究所广西桂林541000

甘肃白银市银硐沟铜锌矿位于北祁连山早古生代造山带,文章建立一套适用于浅成低温热液型铜铅锌矿床物化探综合勘查模型,对研究矿区的深部进行找矿预测。本次研究在工作区内主要实施地球化学勘查(地电提取测量法、土壤离子电导率测量法... 详细信息

甘肃白银市银硐沟铜锌矿位于北祁连山早古生代造山带,文章建立一套适用于浅成低温热液型铜铅锌矿床物化探综合勘查模型,对研究矿区的深部进行找矿预测。本次研究在工作区内主要实施地球化学勘查(地电提取测量法、土壤离子电导率测量法和热释汞测量法)和地球物理勘查(高精度磁测法和大功率TEM法)等多种勘查技术方法进行找矿预测研究。依托已知矿体剖面,在勘查区共圈出各类综合异常靶区9个,建立了该矿区的综合信息找矿模式,为下一步找矿工作提供了地质理论依据。

关键词：白银矿田银硐沟铜锌矿床多元信息找矿预测

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CHIM-geoelectrochemical method in search of concealed mineralisation in China and Australia

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Chinese Journal Of Geochemistry 2008年第2期27卷 198-202页

作者： luo xianrong HOU Baohong WEN Meilanna ZENG Nanshi John Keeling Roger Fidler Adrian Fabris Guilin University of Technology Guilin 541004 China CRC LEME Primary Industries ＆ Resources South Australia （PIRSA） SA 5000 Australia

A version of the geoelectrochemical prospecting technique developed in China was demonstrated in China and Australia to test its suitability under both Chinese and Australian *** paper briefly describes the mechanism and effectiveness of the technique applied to search of concealed mineralisation through regolith cover,based on both experimental and field *** paer deals with three main aspects of the method: a) how metallic ions are released from orebodies by electrochemical dissolution;b)how these ions migrate to the collector and are deposited as elements by electrochemical extraction in the presence of an electric field; and c) the effectiveness of the method illustrated by some case studies.

关键词：地球化学矿化作用中国澳大利亚

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内蒙古阿拉善右旗拜兴图地区土壤地球化学异常特征及找矿预测

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桂林理工大学学报 2024年第1期44卷 29-42页

作者：李杰伟高文罗先熔李超张文博商振城刘攀峰邱宏蕊刘秀娟桂林理工大学地球科学学院广西桂林541006 桂林理工大学隐伏矿床预测研究所广西桂林541006 华北地质勘查局五一四地质大队河北承德067000

为优选阿拉善右旗拜兴图地区找矿预测靶区,在查明该区成矿地质条件的基础上开展1∶1万土壤地球化学测量。采用元素变异系数、ILR变换、ILR-PCA多元统计分析法对研究区Au、Ag、Co、Cu、Pb、Zn和As等7种元素进行分析,结果表明:(1)成矿元... 详细信息

为优选阿拉善右旗拜兴图地区找矿预测靶区,在查明该区成矿地质条件的基础上开展1∶1万土壤地球化学测量。采用元素变异系数、ILR变换、ILR-PCA多元统计分析法对研究区Au、Ag、Co、Cu、Pb、Zn和As等7种元素进行分析,结果表明:(1)成矿元素主要赋存于断裂与矿化蚀变带交汇部位,Au、Ag呈现强分异富集特征,成矿潜力大;Pb、Zn、As、Co、Cu呈现低分异富集特征,成矿潜力较小。(2)ILR变换可消除原始数据的闭合效应,使元素呈现标准正态分布;ILR-PCA第一主成分能最大限度提取原始数据的综合信息,即PC1正端载荷(Au-Ag-As)为成矿指示元素,元素异常强度和形态受断裂与矿化蚀变带控制,负端载荷(Co-Cu-Pb-Zn)为多期次岩浆热液活动引起。(3)对Ⅰ号找矿靶区进行工程验证,查明靶区数条金(银)矿体,金、银含量均达到或超过最低工业品位,表明拜兴图地区具有较大的金、银找矿潜力。

关键词：土壤地球化学 ILR变换 ILR-PCA 找矿预测拜兴图阿拉善右旗内蒙古

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地电提取法寻找贫硫化物金矿的研究

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地质与勘探 1999年第4期35卷 42-44页

作者：罗先熔桂林工学院桂林541004

通过在江西贫硫化物的金山金矿区开展地电提取法寻找贫硫化物金矿的研究，认为金山金矿深部隐伏金矿体存在着较弱的电化学溶解作用。按现有的激发装置，在地表仍能提取到Ａｕ的异常反映。

关键词：贫硫化物找矿研究金矿床地电提取

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金属矿床地电化学勘查方法研究现状及前景展望

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地质论评 2005年第4期51卷 452-457页

作者：康明罗先熔长安大学地球科学与国土资源学院西安710054 桂林工学院资源与环境工程系 541004

地电化学勘查方法是20世纪70年代兴起的找寻隐伏矿床的新方法之一,包括地电提取法和土壤离子电导率测量法。它从20世纪70年代到90年代末这30多年的发展中一直被地学专家列为新的前缘课题来研究,它所提取的成矿信息来自于深部矿体,这一... 详细信息

地电化学勘查方法是20世纪70年代兴起的找寻隐伏矿床的新方法之一,包括地电提取法和土壤离子电导率测量法。它从20世纪70年代到90年代末这30多年的发展中一直被地学专家列为新的前缘课题来研究,它所提取的成矿信息来自于深部矿体,这一点经国内外科研工作者多年的找矿实践所证实,毋庸质疑。由于前苏联研制的“部分提取金属法”设备笨重、野外工作效率低、成本高而一直未能得到普及应用,随着方法技术的不断改进,其适用范围有所扩展,为地电化学方法找寻隐伏矿床开拓了广阔的道路。

关键词：金属矿床地电化学勘查方法隐伏矿床地电提取法土壤离子电导率法

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Numerically quantifying the relative importance of topography and buoyancy in driving groundwater flow

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Science China Earth Sciences 2010年第1期53卷 64-71页

作者： YANG JianWen 1,2,FENG ZuoHai 1,luo xianrong 1 & CHEN YuanRong 1 1 Faculty of Earth Sciences,Guilin University of Technology,Guilin 541004,China 2 Department of Earth and Environmental Sciences,University of Windsor,Windsor,Ontario,N9B 3P4,Canada 1. Faculty of Earth Sciences Guilin University of Technology Guilin 541004 China2. Department of Earth and Environmental Sciences University of Windsor Windsor Ontario N9B 3P4 Canada

Both topography and buoyancy can drive groundwater flow;however,the interactions between them are still poorly *** this paper,the authors conduct numerical simulations of variable-density fluid flow and heat transport to quantify their relative *** finite element modeling experiments on a 2-D conceptual model reveal that the pattern of groundwater flow depends largely upon the relative magnitude of the flow rate due to topography alone and the flow rate due to buoyancy *** fluid velocity due to topography is greater than that due to buoyancy at large water table gradients,topography-driven 'forced convection' overwhelms buoyancy-driven 'free convection'.When flow velocity due to buoyancy is greater than that due to topography at small water table gradients,mixed free and forced convection takes *** this case,free convection becomes dominant,but topography-driven flow still plays an important role since it pushes the free convection cells to migrate laterally in the downhill ***,hydrothermal fluid flow remains changing periodically with time and no steady state can be *** presence of a low-permeability layer near the surface helps eliminate the topography effect on the underlying free convection.

关键词： hydrothermal flow free convection forced convection topography buoyancy finite element modeling

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基于AutoCAD及ANSYS平台的地质网格模型建模方法探讨

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地质论评 2016年第B11期62卷 81-82页

作者：赵义来罗先熔广西隐伏金属矿产勘查重点实验室桂林理工大学地球科学学院广西桂林541004

1研究背景对成矿过程进行数值模拟实验是当前开展成矿作用研究的新兴手段之一，其前处理阶段即计算用地质网格模型的建立往往成为制约后续实验过程的一个瓶颈，原因在于：一、地质体的形态不规则，甚至是复杂的，对其进行三维建模难度... 详细信息

1研究背景对成矿过程进行数值模拟实验是当前开展成矿作用研究的新兴手段之一，其前处理阶段即计算用地质网格模型的建立往往成为制约后续实验过程的一个瓶颈，原因在于：一、地质体的形态不规则，甚至是复杂的，对其进行三维建模难度较大，所成模型也趋于简化处理，从而影响计算结果的精确性；二、专业的数值计算软件其建模模块稍弱，不足以应对复杂地质体模拟，而专业的建模软件往往又不具备模拟成矿过程的数值计算功能。因此需取长补短，对不同软件加以综合运用，实现对地质体的计算用网格模型构建。

关键词：数值模拟网格模型三维地质建模 AutoCAD ANSYS

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