冀西北水晶屯金矿金及其指示元素的水平分带特征   总被引：1，自引：0，他引：1  

魏俊浩 《黄金地质》1995,1(1):51-54

对水晶屯金矿的地质特征进行了简要介绍，选择了对找金具有指示意义的８种元素，Ａｕ，Ａｓ，Ｓｂ，Ｈｇ，Ａｇ，Ｐｂ，Ｍｏ，Ｂｉ。详细讨论了金及其指示元素泊水平分带特征，这对评价该矿床的剥蚀程度，深部含矿性具有指导意义。  相似文献   

太古代脉状金矿研究的某些新进展   总被引：3，自引：0，他引：3  

孙丰月 《地质科技情报》1995,14(3):61-66

主要介绍了近几年来关于太古代脉状金矿的产出环境、成矿物理化学条件等方面研究取得的一些新进展，加会聚构造成矿和地壳连续成矿模式的提出等；初步讨论了我国在太古代高级变质区寻找高温脉状金矿时应注意的问题。  相似文献   

航磁、重力异常及数据处理成果在清原地区金矿地质研究中的应用     

单汝俭  焦新华  周富祥 《吉林大学学报(地球科学版)》1995,(1)

通过航磁、重力异常及数据处理成果的分析和研究，阐述了清原地区深部构造、区域构造、花岗岩体及太古宙变质杂岩的展布特征与金矿成矿之间的关系，指出了该区金矿成矿的远景地段。  相似文献   

Evidence for a Neoproterozoic carbonate ramp on the northern edge of the Central African craton: relations with late Proterozoic intracratonic troughs     

Philippe Alvarez 《International Journal of Earth Sciences》1995,84(3):636-648

During Late Proterozoic times, the Archaean Central African craton was affected by trough faulting which led to the formation of grabens, the Sangha aulacogen being the main structure of this type in the studied area. This transverse basin connects with other basins on the northern and south-western borders of the craton. During the Cryogenian, this network of basins was filled with fluvio-deltaic and lacustrine periglacial deposits. The glacio-eustatic transgression in Neoproterozoic III (end-Proterozoic) times flooded extensive areas of shelf on the northern edge of the craton, leading to the development of carbonate sedimentation in a broad outer shelf environment associated with nearshore barriers and evaporitic lagoons. These facies are similar to those developed in the West Congolian Schisto-calcaire (shale-limestone) ramp succession. The North-Central African ramp succession (sediment slope) contains an example of tidal rhythmites in vertical accretion, which occurs beneath the barrier deposits on the subtidal outer shelf. Mathematical analysis of the bedding pattern yields a period of 29–30 days for the lunar month, a result which is in agreement with astrophysical evidence for this epoch (i.e. 650 Ma ago). Major subsidence and seismic activity on this gently sloping platform, associated with the proximity of the Sangha aulacogen, caused the triggering of carbonate turbidites and mass flow deposits. The proliferation of microbial mats under euphotic conditions on an extensive shelf led to the build-up of a carbonate platform. During early Neoproterozoic III times, the West Congolian and North-Central African ramps prograded northwards and southwards, respectively, into the Sangha aulacogen. The sea at that time was restricted to a long graben-like basin, while a remaining area of marine sedimentation persisted into the Palaeozoic. Thus the pattern of end-Proterozoic carbonate sedimentation on the borders of the Central African craton can be interpreted in terms of an overall gently sloping ramp model with progradation converging towards the Sangha aulacogen.  相似文献   

Prediction of the Granite—Type Gold Deposits by Grey Relational Analysis     

费忠华  王京贵等 《中国地球化学学报》1995,14(2):188-192

Calculated in this paper is the relational grade between each of ghe 1608 prediction units and the granite-type gold deposits in Jiaodong, concerning 78 geological variants of factors ,in terms of the relational grade analysis of the grey system.The isopleth of the residual values is drawn through trend analysis and anomalies are outlined. Also pointed out in the present paper are the pathfinders for prospecting of gold deposits in various parts of China.  相似文献   

李梅锌矿床地质特征及其成因   总被引：15，自引：0，他引：15  

夏新阶  舒见闻 《大地构造与成矿学》1995,19(3):197-204

李梅锌矿床是渔塘超大型铅锌矿床的重要组成部分，是近年运用地洼学说预测，经初步验证查明的大型矿床。主要组分锌＞５％，铅很低。矿体主要赋存于下寒武统清虚洞组台地边缘藻礁灰岩相中，为同生构造组合、穹窿、北北东和北西西向地洼构造所控。属多因复成矿床，地台阶段主要是矿源层经压溶作用形成构造压溶热液成矿，在地洼阶段可能是渗流热液成矿，铅锌等成矿物质来自寒武纪碳酸盐围岩，主要成于低温。  相似文献   

由铅同位素年龄计算模式的选择探讨凤─成铅锌成矿带的形成     

金勤海 《陕西地质》1995,(1)

凤（县）－成（县）铅锌成矿带由东向西铅同位素的变化趋势与赋矿围岩从泥盆系递变为三叠系相一致，显示了成矿物质的层控性；与印支期构造运动相伴的侵入岩广泛分布，且参与矿化，反映成矿与该期构造、岩浆活动有联系，这种联系可能是成矿作用具较明显时控性的重要因素。  相似文献   

广西佛子冲铅锌（银）矿田岩浆岩的时代及地球化学特征   总被引：16，自引：1，他引：16  

雷良奇 《岩石学报》1995,11(1):77-82

广西佛子冲铅锌（银）矿田内发育两个岩浆岩系列，即海西期弱碱质Ｓ型花岗岩系和燕山期钙碱质Ⅰ型花岗质火山岩系，两者的地球化学特征差异十分显著。钙碱质岩系由早期至晚期，其岩石特征参数、微量元素及稀土元素表现出规律性变化，反映出同源火山岩浆的演化特征。铅锌（银）成矿作用与钙碱质岩系，尤其是晚期浅成侵入体（次火山岩）密切相关。  相似文献   

江西留龙金矿矿质来源及硫,铅,氢,氧同位素组成研究   总被引：2，自引：0，他引：2  

张乾  张宝贵 《华东地质学院学报》1995,18(1):21-28

留龙金矿存在两种不同类型的金矿体，一类为毒砂石英脉；另一类为铅锌硫化物石英脉。它们都受上施组火山沉积凝灰岩中近南北向断裂控制，具有不同的矿物组合、成矿温度和同位素组成。毒砂石英脉形成于１４０￣２２０℃，δ＾３４Ｓ的值－０．０４‰￣－１．０４‰，铅同位素组成与变沉凝灰岩一致，成矿流体以大气降水为主，是加热了大气降水热液改造围岩而形成的改造型矿体。铅锌硫化物石英脉形成于２６０￣３２５℃，δ＾３４Ｓ值－  相似文献   

磁性勘探在金属矿床中应用的若干进展   总被引：1，自引：0，他引：1  

郭友钊  杨辟元  余钦范  谭承泽 《物探与化探》1995,19(1):48-53,59

本文介绍磁性勘探方法在金属矿产应用中的若干进展.目前,磁性勘探已在区分同生矿床、后生矿床、热液矿床和层控矿床,在确定矿床形成时代、寻找矿源体以及岩体含矿性评价、寻找隐伏矿体等方面已取得了良好的进展,并显示在解决这些问题中磁性勘探方法的独特手段.  相似文献