湖南省红土类型与红土型金矿找矿方向

湖南省风化残积红土按其原岩性质可分为花岗岩红土、喀斯特红土、碎屑岩红土、元古界红土和岩浆热液红土等5个类型。其中岩浆热液红土含金性最好,富集系数最大,元古界红土最差。湖南的地质构造格局产生了有利于风化作用的地形条件,多期强烈构造运动产生的多方向多序次的断裂带和频繁的岩浆活动造成的围岩蚀变,为红土型金矿的形成造就了良好的矿源体条件。湖南红土型金矿有着良好的找矿远景,岩浆热液型红土则是主要找矿方向。     

普兰店市金厂沟红土型金矿基本特征及勘查评价工作建议

金厂沟红土型金矿在辽南地区属首次发现。该金矿为改造红土型金矿,产出于原生矿体之上或其附近的残坡积红土中,划分为三种类型:残积型、坡积型和残坡积型。矿体总体呈近东西向条带状分布,规模较大,品位较高,开发利用前景较好。根据矿体出露形态特征、地质特征及初步取得的基本数据进行分析和统计,对勘查评价工作手段、工程网度及工业品位指标的选取提出建议。     

桂西辉绿岩型金矿的新认识

辉绿岩型金矿是桂西微细粒型金矿的重要矿床类型之一,但桂西辉绿岩(玄武岩)区域金丰度仅为2.45×10-9,不具备形成金矿的物质基础。为此,文章对此类金矿的形成机制、物质来源(金源)以及矿床类型等相关问题进行探讨,认为此类金矿属于改造型金矿,金主要来源于基性岩浆对地层含金地质体的混熔改造,并指出那坡等地是广西寻找该类金矿最具潜力的地区。     

金矿物的性状及其次生作用与地质找矿意义

原生矿床中金的主要性状有自然金与金的碲化物.自然金可分为"明金"和"微细粒金"."明金"的次生作用,使金的成色得到提高,粒度更大,往往有利于残坡积型砂金矿床的形成."微细粒金"的次生作用,常形成卡林型氧化金矿或红土型金矿和铁帽型金矿.显然,以"明金"为主的矿床及金的重砂异常区,不存在找红土型金矿的可能,应寻找脉金矿床.而在有低值金的重砂异常叠加的化Au异常区,有望找到中小型红土型金矿床.     

广西宾阳三水铝土矿床地质特征、成矿条件及成矿机理

广西宾阳三水铝土矿床属我国发现的一种新型铝土矿床，是继福建漳浦、海南蓬莱和台湾大屯山发现的三水铝土矿床之后的第四种类型三水铝土矿床——钙红土型三水铝土矿床，其源岩主要为碳酸盐岩。文章通过分析该矿床的地质特征、成矿地质条件及其成矿机理。指出红土化作用是钙红土型三水铝土矿床的主导成矿作用。     

辽南首次发现“红土型金矿”

近期 ,辽宁地质勘查院在大连普兰店市元台镇金厂沟地区在岩金普查价过程中发现了“红土型金矿”。该金矿主要赋存于原生金矿体附近的残坡积红土中 ,分布面积较大 ,金品位较高 ,通过专家鉴定论证 ,确认为“红土型金矿”。该类型金矿为辽南首次发现 ,在我国北方实属罕见。“红土型金矿”是在外生作用条件下 (主要为风化作用 ,包括天然水、空气、生物、温度、化学反应等 ) ,先成含金地质体被加以改造 (红土化 ) ,经沉淀富集于风化剖面的有利部位而形成的表生金矿。世界上第一个发现的大型红土型金矿是 1980年澳大利亚的博丁顿金矿 ,在国内 ,从 …     

桂西古侵蚀沉积断面型金矿床

古侵蚀沉积间断面型金矿是桂西的主要金矿床类型.文章着重分析该类型金矿成矿地质条件,论述矿床成因及成矿机理,认为此类型金矿易采易冶,经济效益显著,建议加大开发力度.     

侯马市成家山金矿矿体地质特征及找矿标志

通过对成家山金矿矿体地质特征的分析研究,主要目的是总结找矿标志,指导今后找矿。成家山金矿成因类型属岩浆热液金矿床亚类接触交代-热液金矿床,工业类型为含金石英脉型。金矿体的产出严格受次级断裂构造的控制,含矿岩石为碳酸盐化石英脉和构造角砾岩。其找矿标志为构造(次级断裂)标志、岩性(构造角砾岩、碳酸盐化石英脉)标志。     

桂西北主要金矿床地质特征

桂西北微细粒浸染型金矿是广西近年来发现的新类型金矿床。本文在大量地质勘查资料基础上,通过对金牙、高龙两个典型矿床的综合研究进行了总结。论述了该类型矿床成矿的区域地质背景,矿床地质特征,并对成矿条件进行初步分析,探讨矿床成因和找矿方向。     

广西金矿地质及找矿前景浅析

本文从目前金矿在时间、空间上的分布特征、赋金层位和岩性、金矿类型等方面概述了金矿地质现状,在广西50多个县内已发现金矿床、矿(化)点三百余处。在已探明的储量中,有57％左右的金矿产在寒武系中;三叠系的各类型金在预测储量中占45％左右。多期次的构造、岩浆活动形成了种类繁多的金矿床。依据成矿物质来源、成矿作用和矿化特征将广西金矿分成二个大类,七种成因类型九个亚类。本文还对各类型金矿特征作了简介,叙述了各类型金矿找矿的新进展并划分了成矿远景区。     

浙江非金属矿产地质研究的若干问题

浙江是环太平洋带最著名的非金属成矿区之一。本文在回顾浙江非金属矿床研究的基础上,论述了当前非金属成矿学、矿床地球化学、矿物学等领域中一些值得关注的问题或课题。     

山东内生金矿矿床谱系及其致矿地质异常

矿床谱系是对成矿多样性的理论概括,而成矿多样性又是由不同级别、不同性质的致矿地质异常决定的.本文论述了山东省内生金矿矿床谱系及其致矿地质异常.     

CHARACTERIZATION OF FINE-GRAINED TURBIDITE DEPOSITS FROM THE SOUTH CHINA SEA SEDIMENT CORES

Two depositional processes controlled the muddy sediments in the South China Sea Basin. Bathyal sediments depositional rate was 7.66 cm/la in the northern continental slope of the Basin where turbidity current was almost nonexistent. In the northern margin of the Basin, abyssal sediment depositional rate was 5.05cm/ka and turbidity current occurrence averaged 0.22 per 1000 years. Turbidite was found in the middle of the Basin. Over half of the muddy sediments in the deep sea basin were deposited by turbidity currents, and had typically graded bedding, and contents of organic matter, calcareous material and micropaleontologic species inconsistent with the environment.     

Evidences of Holocene transgression on Domingos Petrolini Swamp, southern coastal plain, Rio Grande do Sul, Brazil

The Domingos Petrolini Swamp, located on the Southern Coastal Plain of Rio Grande do Sul, near the town of Rio Grande, constitutes an ample holocene lagoonal deposit. Events related to the holocene transgression and their diverse phases of glacial-eustatic ocillations were found through palynological analysis. Bases on these palynological data, four distinct phases to the paleoenvironmental evolution of the ecosystem were identified. It has also shown a transgressive restricted marine sequence on the base, which suggests the existence of a coastal brackish lagoon or a marisme type of environment. Later, there was a gradation for continentality conditions along with a scarce pollinical record. The third phase is characterized by the presence of marine components and halophyte vegetation, showing another transgressive event in that place. Lastly, the end of direct marine influence over the swamp was recorded and also the vegetation development as it appears these days.     

Evidences of Holocene transgression on Domingos Petrolini Swamp, southern coastal plain, Rio Grande do Sul, Brazil

The Domingos Petrolini Swamp, located on the Southern Coastal Plain of Rio Grande do Sul, near the town of Rio Grande, constitutes an ample holocene lagoonal deposit. Events related to the holocene transgression and their diverse phases of glacial-eustatic ocillations were found through palynological analysis. Bases on these palynological data, four distinct phases to the paleoenvironmental evolution of the ecosystem were identified. It has also shown a transgressive restricted marine sequence on the base, which suggests the existence of a coastal brackish lagoon or a marisme type of environment. Later, there was a gradation for continentality conditions along with a scarce pollinical record. The third phase is characterized by the presence of marine components and halophyte vegetation, showing another transgressive event in that place. Lastly, the end of direct marine influence over the swamp was recorded and also the vegetation development as it appears these days.     

Evidences of Holocene transgression on Domingos Petrolini Swamp, southern coastal plain, Rio Grande do Sul, Brazil

The Domingos Petrolini Swamp, located on the Southern Coastal Plain of Rio Grande do Sul, near the town of Rio Grande, constitutes an ample holocene lagoonal deposit. Events related to the holocene transgression and their diverse phases of glacial-eustatic ocillations were found through palynological analysis. Bases on these palynological data, four distinct phases to the paleoenvironmental evolution of the ecosystem were identified. It has also shown a transgressive restricted marine sequence on the base , which suggests the existence of a coastal brackish lagoon or a marisme type of environment. Later, there was a gradation for continentality conditions along with a scarce pollinical record. The third phase is characterized by the presence of marine components and halophyte vegetation, showing another transgressive event in that place. Lastly, the end of direct marine influence over the swamp was recorded and also the vegetation development as it appears these days.     

甘肃北山拾金坡岩体特征及其含金性研究

本文对甘肃北山南带拾金坡岩体地质、岩石学、岩石化学、稀土元素、稳定同位素及同位素年代学等方面作了较系统的研究,认定该岩体属加里东晚期以陆壳改造为主的多成因复式岩体。对副矿物磁铁矿含金性的研究,推断岩体成岩时原始含金丰度较高。海西早期岩体发生了较强烈的钾交代作用,“酸碱分离”形成了含金石英脉型矿化。     

莱州新立金矿床的发现及其地质特征

新立金矿床地处渤海莱州湾畔,含矿蚀变带隐伏于海水之下,矿床位于三山岛断裂带（主要控矿断裂）由ＮＥ向转为ＮＥＥ向的拐弯部位。三山岛、仓上金矿床也分布在该断裂带拐弯地段。根据胶东地区金矿主要受ＮＥ向断裂控制,构造产状变化或构造交汇部位易于成矿,以及金矿床具有等距分布的特点,今后找矿的重点地段应是仓上金矿床北部和芙蓉岛—潘家屋子一带。     

辽宁清原花岗岩-绿岩带金矿资源预测

采用1:5万区域地质调查资料,选取16个地层、构造、火成岩及其接触带和化探数据变量。每一种预测方法,抽取了与金矿资源有关的676×16的原始数据矩阵,并且建造了金矿资源和地质环境之间的数学模型以预测区域金矿资源远景。采用的数学模型有:因子空间的欧氏距离、因子分析和特征分析法,其结果绘制在综合成矿预测图上,共圈出8个1级金矿远景区。本区已知的金矿床、矿点均落入了预测区内,并首次圈定了一些新的金矿远景区,有待进一步详细勘查工作的证实。     

辽东硼镁石型硼矿床地质特征及成矿作用

辽东硼镁石型硼矿床赋存于早元古宙富铁、硼火山沉积岩建造中，表现出明显的地层岩性控矿性。硼的成矿作用是多期的，沉积成矿作用是基础，变质成矿作用对原始沉积矿床起了改造和富集作用，构造变形作用使硼矿体发生了重就位。硼矿床的硼质来源以火山源为主，陆源为次，矿床成因属叠生层控变质火山沉积矿床。