西藏谢通门展咱木部异常区铅锌找矿前景   总被引：2，自引：2，他引：0  

夏祥标  郑来林  李军敏  李再会 《现代地质》2011,25(1):108-113

从区域地质、水系沉积物测量、土壤测量和高精度磁测等方面对西藏展咱木部地区的铅锌找矿前景做初步分析。出露地层主要为第三系始新统年波组的晶屑凝灰岩及安山玢岩,区内出露岩体主要为始新世花岗岩及小面积的花岗斑岩。利用1∶5万水系沉积物测量编制异常图,发现区内Pb、Zn、Ag、Au、Sb、Cu、Ba、Hg、Sn、As等元素有不同规模的明显异常,且Pb、Zn异常规模较大。通过土壤剖面可以看出Pb、Zn异常更显著。高精度磁测结果显示,化探异常位于磁异常附近。磁异常的定性分析对这些金属矿的深部找矿预测可以提供有利证据。磁异常显示该区是热液成矿的有利部位。通过研究元素间组合关系发现,Pb、Zn与Ag、As、Sb、Cu的关系密切,结合化探异常和地质特征,推断区内可能存在与火山岩有关的铅锌多金属矿床类型。研究表明研究区内寻找与火山岩有关的铅锌（银）多金属矿有较好的找矿前景。  相似文献   

现代海底热液成矿作用     

李文渊 《地球科学与环境学报》2010,32(1):15-23

从现代块状硫化物矿床成矿特征对比角度,总结分析了世界现代海底喷流的块状硫化物成矿堆积,综述了现代海底块状硫化物成矿主要形成于洋壳和岛弧环境的实际观察结果,突出强调了洋壳环境和岛弧或陆壳环境两种成矿环境对成矿类型分类的意义。对上地幔部分熔融岩浆来源与地壳物质可能带入、火山喷发岩浆系列的演化和对热液成矿作用的控制进行了讨论,对比分析了岩浆流体对成矿的重要贡献和控制作用,以及成矿热液循环体系形成的条件和模式。  相似文献   

沂水县杏山官庄铁矿地质特征   总被引：1，自引：1，他引：0  

段林祥  文唐章  王仕昌  王标  毛福仁 《山东国土资源》2010,26(2):12-14

在汞丹山凸起中分布的基性—超基性岩体,其磁铁矿含量高者可构成矿体。利用高精度磁测、钻探等方法开展了沂水县杏山官庄铁矿的普查工作,大致查明了该矿体的规模、形态和产状,认为该矿床具有低品位、工程地质条件简单的特点,综合分析矿床成因属岩浆分异型磁铁矿矿床。  相似文献   

山东莱芜接触交代—热液铁矿矿体形态研究   总被引：1，自引：0，他引：1  

宗信德  贾东亮  刘超  尹承亮  刘纪涛  王建 《山东国土资源》2010,26(11)

在对莱芜接触交代铁矿地质特征研究中发现以往地质报告在矿体连接上存在混乱,使矿体形态失真。为便于今后矿体对比和成矿规律的认识,提出了矿体形态分类原则,并以三分法对矿体形态进行分类。指出矿体产状变化是矿体膨胀收缩、分支复合和尖灭再现的结果。根据矿体形态分类指出了找矿方向。不同的矿体形态反映不同的控矿构造,反映不同的矿体规模,反映不同的成矿岩体形态产状。单斜缓倾矿体的成矿岩体是岩床,控矿较小;陡倾矿体和背向斜矿体的成矿岩体是岩盖,控矿较大。  相似文献   

Geology and geochemistry of Huanggangliang stratabound skarn deposit in Inner Mongolia, China     

WANG Changming 《世界地质(英文版)》2010,13(2):61-69

Over the recent three decades,exploration of a large-size Sn-Fe polymetallic ore deposit at the Huanggangliang, the Da Hinggan Mountains, Inner Mongolia, China, has been largely focused on the premise that the mineralization represents epigenetic magmatic hydrothermal ore deposit in genetic connection with the Mesozoic magmatism. The Huanggangliang Sn-Fe polymetallic ore deposits occurred in Permian strata, with siltstone/marble of the Zhesi Formation and spilite/andesite/tuff of the Dashizhai Formation. The characteristics of geological and geochemical data demonstrated that sedimentary hydrothermal mineralization occurred during the basin evolution at the Permian, rather than representing epigenetic magmatic hydrothermal genesis with the following evidences. The ore-bearing skarns are stratiform with underlying metasedimentary rocks and overlying volcanic sedimentary rocks. Sedimentary hydrothermal textures and structures are observed in the stratabound ore-bearing skarn such as bedded-laminated skarn and magnetite ores with small-size folding or soft deformation, synsedimentary breccia of skarn and magnetite ores and concentric shell structure of magnetite ores. So the stratabound ore-bearing skarns associated with magnetite ore and micro-disseminated tin, are peculiar examples of exhalite. The REE contents of the stratabound ore-bearing skarns display ΣLREE-rich (36.91×10-6) but ΣHREE-depletion (6.42×10-6), with positive Eu anomaly (Eu/ Eu 1.28) and negative Ce anomaly (Ce/Ce 0.88), which is totally different from REE pattern of the Huanggang magmatic rocks(with ΣREE 277.73×10-6, ΣLREE 220.24×10-6, ΣHREE 57.49×10-6, Eu/Eu 0.06, Ce/ Ce 1.52), which is comparable with modern sea-floor hydrothermal fluid,sedimentary hydrothermal ore deposit and associated hydrothermal sedimentary rocks. Calcite samples with δ13CPDB from -5.400 ‰ to -4.397 ‰ and δ18OSMOW from 9.095 ‰ to 9.364 ‰ in the stratabound ore-bearing skarns show sedimentary hydrothermal genesis of the Huanggangliang deposit. This proposition is useful not only for interpretation of the genesis of the Huanggangliang large Sn-Fe polymetallic ore deposit but also significant for mineral exploration in the area especially for finding large deposits caused by sedimentary exhalative mineralization processes.  相似文献   

广西大厂矿区地震台网技术系统设计   总被引：1，自引：1，他引：0  

杨松文  姚宏  陈鑫  徐宁  龙政强  牟剑英 《华南地震》2010,30(2):97-106

金属矿区开采活动所引起的地质体强度弱化,并产生矿震灾害已引起政府和企业的重视。介绍了全国首个金属矿区地震台网技术系统设计指导思想、台网布局及主要技术指标,以及提出建设矿山地震台网的作用及意义。  相似文献   

巴尔喀什成矿带奎干-玛依布拉克斑岩型铜矿区矿床地质特征与开发前景分析     

王志宏  陈宣华  杨农  陈正乐  韩淑琴 《地质力学学报》2010,16(2):213-222

哈萨克斯坦巴尔喀什湖南侧的奎干-玛依布拉克铜矿区位于巴尔喀什成矿带环巴尔喀什-准噶尔成矿省楚伊犁-北天山成矿亚省的西北部, 发育一系列中小型斑岩型铜矿床。本文概要介绍了奎干-玛依布拉克铜矿区矿床地质、围岩蚀变、成矿作用、矿石矿物组成与主要矿床特征, 并分析了铜矿床开发的前景。该铜矿区含矿岩石主要为花岗闪长斑岩, 成矿元素组合主要为Cu-Au-Mo, 具有与巴尔喀什湖北侧科翁腊德、阿克斗卡等超大型斑岩型铜矿床类似的地质特征, 说明了巴尔喀什成矿带斑岩型铜矿床的分布跨越了巴尔喀什湖, 在湖南侧也具有较好的斑岩铜矿成矿远景。   相似文献   

吉林夹皮沟金矿带黄铁矿热电性及热爆裂特征   总被引：4，自引：2，他引：2  

张玙  袁万明  王庆飞  刘向伟  马楠  赵凯 《现代地质》2010,24(5):870-879

通过对夹皮沟金矿带主要载金矿物黄铁矿的热电性和热爆裂特征分析,确定了主成矿世代及各世代矿化类型,预测了深部探矿的可能性。黄铁矿以电子型(N型)为主,极少有空穴型(P型),N型热电系数分布于-347.3～-6.2 μV·℃-1,P型热电系数介于17.4～193.5 μV·℃-1, 成矿温度集中于258.8～319.2 ℃, 剥蚀率为50.260%～50.485%。爆裂曲线反映中低温(＜280 ℃)矿化没有高温(＞290 ℃)矿化好。综合分析认为,夹皮沟金矿带矿化分早期高温世代(热电系数峰值为-120 μV·℃-1,成矿温度峰值为320 ℃)和晚期中低温世代(热电系数值峰值为-210 μV·℃-1,成矿温度峰值为270 ℃)。前者包括石英脉型与蚀变岩型,在矿体走向与夹皮沟主断裂一致及相交的矿区中均有发育;后者属石英脉型,主要在矿体走向与夹皮沟主断裂相交的矿区发育,叠加于高温世代热液矿化之上。高温热液矿化世代是主成矿世代,但有叠加的部位矿化增强。  相似文献   

Genetic algorithm for fitting a mixed Bingham distribution to 3D orientations: a tool for the statistical and paleostress analyses of fracture orientations          下载免费PDF全文

Atsushi Yamaji 《Island Arc》2016,25(1):72-83

The clustering of fracture orientations is important for tectonic studies and for geotechnical engineering. In this study, a real‐coded genetic algorithm was adopted to fitting a mixed Bingham distribution to orientation data by maximizing the log‐likelihood function of the distribution. The maximization is a difficult problem, because the function has multimodality and singularity. It was found that the algorithm was effective for this problem. Given the orientations of dilational fractures, the present method determines not only the stress axes and stress ratio of each of the fracture groups but also the maximum non‐dimensionalized fluid pressure at the time of their formation. In addition, the software calculates the 95 % error ellipses of the concentration axes. The present method found that the orientations of ore veins of the Akenobe Mine, SW Japan, should be partitioned into three clusters. It is shown that two of the groups had distinctive Zn and Sn contents, and that the ore fluids had overpressures only slightly greater than the minimum principal stress at the time of the deposition of Zn‐ and Sn‐rich veins.  相似文献   

陕西旬阳砂硐沟汞锑矿含矿构造特征及成矿物质来源探讨     

赵新科  曹林杰  申玉科  李伟松  马云峰  刘亚莉  王晓虎  孙健  刘利民 《地质力学学报》2016,22(2):199-211

陕西旬阳砂硐沟汞锑矿富集区汞锑含矿体受褶皱构造（背斜）和断裂构造的联合控制。通过对控（含）矿构造、富矿空间的构造次序以及结构面组合特征等的详细研究,对初步建立的"背斜+一刀"的成矿模式进行了完善。成矿流体、稀土分析等综合研究显示成矿物质可能来源于地壳深部。已有的勘查工程及找矿成果表明,本矿集区具有较大的找矿潜力。   相似文献