吉林省地质灾害类型及防治对策探讨     

腾继奎 《吉林地质》1997,16(2):62-64

本文针对吉林省的地质灾害类型及各类地质灾害的成因，分布及其危害进行了论述。对其防治对策进行了探讨，提出了切合本省实际的五项防治措施。  相似文献   

内蒙古铜矿床区域成矿特征初步研究   总被引：3，自引：3，他引：3  

沈存利  苏宏伟  王守光 《西北地质》2004,37(3):43-50

近年来，随着内蒙古周边地区铜矿的地质找矿不断取得重大突破，以及内蒙古铜矿勘查取得的一系列重要新进展，在内蒙古开展铜矿地质勘查工作已引起国内外地质学家的关注。笔者经综合研究地质构造、铜矿勘查及有关地球化学等新信息后，均显示出巨大的铜矿找矿潜力。从内蒙古自治区铜矿勘查史以及与邻区对比研究人手，研究总结了全区铜矿床及铜异常空间分布特征，划分出3个铜成矿区(带)，并进一步划分出铜矿床或异常密集区，初步提出了寻找大型及超大型铜矿床的找矿方向。  相似文献   

云南铜矿成矿规律与遥感预测   总被引：2，自引：0，他引：2  

许东  李文昌  赵志芳  卢映祥 《云南地质》2004,23(1):38-46

在遥感图像解译及研究成果基础上，结合地质、物探、化探等综合信息，开展铜矿成矿条件、成矿规律和成矿预测研究，指出今后云南铜矿新的找矿方向，为矿产资源规划和投资决策提供依据。圈定的铜矿成矿远景预测区，将作为今后云南铜矿地质工作优先安排的建议区，亦可作为商业性地质勘查和外资风险勘查的推荐区。  相似文献   

Environmental geochemistry of Zarshuran Au-As deposit, NW Iran   总被引：2，自引：1，他引：2  

Soroush Modabberi  Farid Moore 《Environmental Geology》2004,46(6-7):796-807

Zarshuran deposit is the most famous and important As-Au mine in Iran. However, there is no information on the impact of mining activity on the surrounding environment, especially on water systems. This paper attempts to document the concentration of arsenic and associated elements in waters and sediments resulting from the mining history of Zarshuran, a period covering hundreds of years. Water and sediment samples collected from Zarshuran Stream indicate high content of some potentially toxic elements, especially of As which ranges from 0.028 to 40 ng/l in water and 182 to 36,000 mg/kg in sediment samples. Mining activity, exposure of a large volume of mining wastes to weathering, and the anomalously high background of trace metals in the mining area are considered to be the main sources of heavy metal pollution.  相似文献   

Evolution of Hydrothermal System at the Dizon Porphyry Cu-Au Deposit, Zambales, Philippines     

Akira Imai 《Resource Geology》2005,55(2):73-90

Abstract. Evolution of hydrothermal system from initial porphyry Cu mineralization to overlapping epithermal system at the Dizon porphyry Cu‐Au deposit in western central Luzon, Zambales, Philippines, is documented in terms of mineral paragen‐esis, fluid inclusion petrography and microthermometry, and sulfur isotope systematics. The paragenetic stages throughout the deposit are summarized as follows; 1) stockwork amethystic quartz veinlets associated with chalcopyrite, bornite, magnetite and Au enveloped by chlorite alteration overprinting biotite alteration, 2) stockwork quartz veinlets with chalcopyrite and pyrite associated with Au and chalcopyrite and pyrite stringers in sericite alteration, 3) stringer quartz veinlets associated with molybdenite in sericite alteration, and 4) WNW‐trending quartz veins associated with sphalerite and galena at deeper part, while enargite and stibnite at shallower levels associated with advanced argillic alteration. Chalcopyrite and bornite associated with magnetite in quartz veinlet stockwork (stage 1) have precipitated initially as intermediate solid solution (iss) and bornite solid solution (bnss), respectively. Fluid inclusions in the stockwork veinlet quartz consist of gas‐rich inclusions and polyphase inclusions. Halite in polyphase inclusions dissolves at temperatures ranging from 360d?C to >500d?C but liquid (brine) and gas (vapor) do not homogenize at <500d?C. The maximum pressure and minimum temperature during the deposition of iss and bnss with stockwork quartz veinlets are estimated to be 460 bars and 500d?C. Fluid inclusions in veinlet stockwork quartz enveloped in sericite alteration (stage 2) consist mainly of gas‐rich inclusions and polyphase inclusions. In addition to the possible presence of saturated NaCl crystals at the time of entrapment of fluid inclusions that exhibit the liquid‐vapor homogenization temperatures lower than the halite dissolution temperatures in some samples, wide range of temperatures of halite dissolution and liquid‐vapor homogenization of polyphase inclusions from 230d?C to >500d?C and from 270d?C to >500d?C, respectively, suggests heterogeneous entrapment of gaseous vapor and hypersaline brine. The minimum pressure and temperature are estimated to be about 25 bars and 245d?C. Fluid inclusions in veinlet quartz associated with molybdenite (stage 3) are dominated by gas‐rich inclusions accompanied with minor liquid‐rich inclusions that homogenize at temperatures between 350d?C and 490d?C. Fluid inclusions in vuggy veinlet quartz associated with stibnite (stage 4) consist mainly of gas‐rich inclusions with subordinate polyphase inclusions that do not homogenize below 500d?C. Fluid inclusions in veinlet quartz associated with galena and sphalerite (stage 4) are composed of liquid‐rich two‐phase inclusions, and they homogenize into liquid phase at temperatures ranging widely from 190d?C to 300d?C (suggesting boiling) and the salinity ranges from 1.0 wt% to 3.4 wt% NaCl equivalent. A pressure of about 15 bars is estimated for the dilute aqueous solution of 190d?C from which veinlet quartz associated with galena and sphalerite precipitated. In addition to a change in temperature‐pressure regime from lithostatic pressure during the deposition of iss and bnss with stockwork quartz veinlets to hydrostatic pressure during fracture‐controlled quartz veinlet associated with galena and sphalerite, a decrease in pressure is supposed to have occurred due to unroofing or removal of the overlying piles during the temperature decrease in the evolution of hydrothermal system. The majority of the sulfur isotopic composition of sulfides ranges from ±0 % to +5 %. Sulfur originated from an iso‐topically uniform and homogeneous source, and the mineralization occurred in a single hydrothermal system.  相似文献   

西藏自治区乃东县劣布铜矿综合地质特征     

江化寨  陈自康 《地质找矿论丛》2005,20(8):81-86

文章介绍区域地质背景、矿区地物化特征，对成矿时代、流体包裹体特征进行初步研究，并指出找矿远景，希望对矿区的矿产勘查具有借鉴和指导意义。  相似文献   

Late Triassic E-MORB-like basalts associated with porphyry Cu-deposits in the southern Yidun continental arc,eastern Tibet: Evidence of slab-tear during subduction?     

《Ore Geology Reviews》2017

It is generally believed that andesite–dacite–rhyolite suites and contemporary porphyry Cu deposits are related to subduction in active continental margin settings. However, it is still unclear which tectonic events result in the generation of porphyry Cu deposits and whether asthenospheric mantle material is involved in this process. Widespread andesitic–dacitic felsic intrusions associated with porphyry Cu deposits and rarer basalts have been identified in the Late Triassic southern Yidun arc (SYA) of eastern Tibet. However, few geochronological and geochemical data are available for these basalts, thereby hampering the development of geodynamic models for this magmatic event and the formation of related porphyry Cu deposits in the region. Here we present the first geochemical and SIMS (secondary ion mass spectrometry) zircon U–Pb data of Xiaxiaoliu basalts in the SYA. The age of the Late Triassic Xiaxiaoliu basalts (216.1 ± 2.8 Ma) is consistent with the timing of emplacement of voluminous porphyritic intrusions and the formation of Cu deposits within the SYA (peaking at 215–217 Ma). The Xiaxiaoliu basalts have E-MORB-like trace element patterns that are free of negative Nb–Ta anomalies, and have high ¹⁴³Nd/¹⁴⁴Nd_(t) values, suggesting they were sourced from asthenospheric mantle without any arc-type influence. These observations, combined with the fact that some Late Triassic mineralized porphyritic intrusions within the SYA have adakitic affinities, suggest that the basalts and other igneous rocks and associated porphyry Cu deposits within the SYA were produced by tearing of a westward-dipping slab, triggering the upwelling of asthenospheric mantle material during subduction of the Garze–Litang Ocean crust.  相似文献   

内蒙古黄花滩铜镍矿区辉长岩LA-ICP-MS锆石U-Pb定年及地球化学特征   总被引：1，自引：0，他引：1  

赵泽霖  李俊建  党智财  付超  唐文龙  王守光  刘利双  赵丽君 《岩矿测试》2016,35(2):208-216

在乌拉特后旗—达茂旗—四子王旗一带的内蒙古中部地区分布着超基性-酸性连续岩浆系列,开展其岩体年代学、地球化学研究可为内蒙古中部地区与超基性-基性岩有关的铜镍矿成矿规律研究提供基础地质资料,还可以推断岩浆侵位时期的区域大地构造背景。本文以达茂旗黄花滩铜镍矿区出露的辉长岩为研究对象,采用LA-ICP-MS仪器对无裂隙、高透明度、阴极发光均匀、环带清晰的锆石进行U-Pb定年,获得岩体加权平均年龄为262.4±1.1 Ma,并利用XRF和ICP-MS进行岩石地球化学分析显示黄花滩辉长岩具有后碰撞拉伸环境下的岩浆特征。综合前人相关研究认为,内蒙古中部地区于中二叠世晚期(255~275 Ma)已经进入后碰撞构造阶段,而古亚洲洋在该区域的闭合应发生在晚二叠世前(~285 Ma),此结论丰富了古亚洲洋闭合时间上限及中晚二叠世期间内蒙古中部地区构造背景方面的证据。  相似文献   

浙江省绍兴市平水金矿体流体包裹体研究 与矿床成因     

陈辉  倪培  陈仁义  吕志成  耿林  张志辉  贾儒雅 《地质论评》2016,62(S1):95-96

浙江平水铜矿位于钦杭成矿带北东段浙西北地区,是浙江省最大的铜矿床,前人研究表明其为典型的火山成因块状硫化物矿床（Chen 等, 2015）。平水铜矿体在新元古代形成之后,该地区经历了加里东的变质变形作用,在铜矿体的下盘普遍发育千糜岩带（韧性剪切带）,本项目组在研究过程中认为千糜岩带与铜矿无关,但明确提出本区可能存在造山型金矿,继而老矿山接替资源勘查在平水铜矿布置了10个坑内钻孔,其中9个见矿,成功的在平水深部发现两层金矿体和一层铜矿体。金矿体严格的受韧性剪切带的控制;金矿石有明显的宏观和微观韧性变形结构;矿石矿物主要是自然金和少量的黄铁矿,脉石矿物主要有石英、绢云母、绿泥石、碳酸盐和白云石。本文主要对平水金矿体开展流体包裹体研究,结合矿床地质特征,最终确定金矿体成因类型,为平水地区下一轮深边部找矿勘查提供依据。  相似文献   

江苏栖霞山矿床铜的来源探讨     

张明超  吕志成  于晓飞  姚磊  陈辉  梁婉娟 《地质论评》2016,62(S1):147-148

江苏栖霞山铅锌银多金属矿床是目前华东地区规模最大的铅锌银多金属矿床,位于长江下游沿江断褶带的宁镇断褶束西端,走向长约8 km,面积约25 km2。矿区自西向东包括西库、甘家巷、北象山、虎爪山、平山头、三茅宫等六个矿段,目前正处于开采阶段的为虎爪山矿段。矿体主要沿纵向断裂带（F2）、不整合面、北西向横断裂、层间错动和层间裂隙、古岩溶构造等呈似层状和不规则状（囊状、脉状和层状）分布。赋矿地层为上泥盆统至下二叠统,其中石炭系黄龙组（C2h）碳酸盐岩地层为最主要的赋矿层位。其矿石矿物主要为方铅矿、闪锌矿和黄铁矿,次为菱锰矿、黄铜矿、磁铁矿等。自实施危机矿山接替资源找矿和老矿山找矿工作以来,矿山找矿效果明显,新增资源量达到中型以上规模,除主攻矿种铅锌矿以外,新发现矿体伴生的有益组分Au、Ag和Cu含量较高,伴生Cu金属量达到1.53万吨,且向深部有明显升高的趋势。在找矿勘查布设的42勘探线和46勘探线可独立圈出1层Au矿体、2层Cu-Ag矿体、3层Ag矿体和1层Cu矿体,Au品位普遍在0.2 g以上,Ag品位多大于10 g/t,Cu品位多大于0.2%。因此,矿区深部具有寻找铜、金、银的前景。本文通过搜集前人研究的基础资料和矿区钻孔取样分析数据,对铜的来源作初步的分析,试图厘清栖霞山矿床铜的物质来源,对于指导深部Cu等伴生有益组分的进一步找矿提供一些科学的依据。  相似文献