青城子小佟家堡子、林家金矿成矿流体特征及成矿机制     

代军治王可勇  杨言辰李基宏 《地质论评》2006,52(6):836-842

小佟家堡子、林家金矿是青城子铅锌、金、银矿集区的中-大型金矿床,金矿床与沉积-变质期硅化岩关系密切。通过与矿区尖山岩体、新岭岩体中流体包裹体对比研究表明,金矿床与尖山岩体中主要发育水溶液包裹体,极少量的CO2包裹体、含CO2三相包裹体,而新岭岩体除发育以上包裹体外,还发育含子矿物多相包裹体。测温结果显示金矿床成矿流体温度为110～335℃,盐度3．9％～16．2％NaClrq拉曼光谱分析表明金矿床流体成分以H2O为主,少量的CO2、CH4等气体,表明成矿流体属NaCl-H2O体系。金矿床与尖山岩体中流体包裹体温度、盐度及成分相近,推断成矿流体主要来自沉积-变质期。  相似文献   

白云鄂博矿床东矿段深部及白云向斜核部探矿的可行性探讨   总被引：5，自引：0，他引：5  

柳建勇苏胜旺  张台荣章雨旭 《地质论评》2006,52(6):821-825

白云鄂博东矿（铁矿石）已属于轻度危机矿山,解决白云鄂博东矿的资源接续问题已迫在眉睫。依据老地质资料和生产过程中的新发现,参考多位矿床成因研究专家的成果,笔者等认为在白云鄂博东矿体深部及白云向斜核部探矿是可行的。  相似文献   

Application of the Load/Unload Response Ratio Theory to Predictions of Moderate Earthquakes (7.0>M≥6.0)     

Chen Xuezhong  Yin XiangchuInstitute of Geophysics  SSB  Beijing ChinaCenter for Analysis  Prediction  SSB  Beijing China 《中国地震研究》1995,(3)

The variation in load/unload response ratio before some moderate earthquakes is analyzed based on the theory of the load/unload response ratio.The results show that the load-unload response ratio increases noticeably before moderate earthquakes,and there are three kinds of patterns in which the load/unload response ratio varies and the duration of noticeable increase in load/unload response ratio ranges from half a year to two years.  相似文献   

Application of Dempster-Shafer theory in mineral resource potential mapping     

CHEN Yong-liang  WU Wei  LI Xue-bin Mineral Resource Prediction Institute of Comprehensive Information  Jilin University  Changchun  Jilin  China Northeastern Geography  Agricultural Ecology Institute of Chinese Academy of Sciences  Changchun  Jilin  China Design  Research Institute of Urban  Rural Planning of Changchun  Changchun  Jilin  China 《东北亚地学研究》2005,(Z1)

The Dempster-Shafer theory has been successfully applied to mineral resource potential mapping in G1S environmental. In this applied form, basic probability assignment and combined basic probability assignment are applied to measuring map pattern and map pattern combination, respectively; and the environment composed of the only two singleton sets (deposit set and non-deposit set), is used for expressing the entire map area. For a subarea in which the certain map pattern combination exists, the combined basic probability assignment corresponding to the map pattern combination existing in this subarea, expresses the belief of inferring the subarea belonging to the deposit set from the evidence that the corresponding map pattern combination existing in the subarea. Thus, it may be served as a statistical index measuring the relative mineral resource potentials of the subarea. And it may be determined like 1) dividing the map area into a series of small equal-sized grid cells and then select the training sample set composed of the well-known grid cells or the entire grid cells; 2) estimating the basic probability assignments corresponding to each map pattern from the training sample set; 3) determining the map pattern combination existing in each cell, and then appling the Dempster's Rule of Combination to integrating the all basic probability assignments corresponding to the map patterns existing in the cell into the combined basic probability assignment. Mineral resource potential mapping with the Dempster-Shafer theory is demonstrated on a case study to select mineral resource targets. The experimental results manifest that the model can be compared with the weights of evidence model in the effectiveness of mineral resource target selection.  相似文献   

蛇绿岩建造非金属矿床成矿系列初步探讨     

鱼海麟 《青海国土经略》1995,(2)

我国蛇绿岩分布广泛。蛇绿岩中有着成因上和时空上紧密联系的一系列非金属矿床,它们构成了蛇绿岩建造非金属矿床成矿系列。这一成矿系列中的主要非金属矿有橄榄岩、玄武岩、蛇纹岩、石棉、滑石、玉石类等等,主要的成矿作用有岩浆作用、接触变质作用、交代蚀变作用等。其成矿作用和矿床分布模式有明显规律,这些规律对于地质勘查、资源开发等都具有重要的意义。  相似文献   

Establishment of digital model for dynamic simulation analysis on hydraulic impact perforator     

WANG Qing-yan  YIN Kun  CHEN Bao-yi  JI Sheng-li College of Construction Engineering  Jilin University  Changchun  Jilin  China 《东北亚地学研究》2005,(Z1)

Hydraulic impact perforator is powerful tools for trenchless project. It has advantages in cabinet structure, low cost, long life and easy protected. Compared with pneumatic DTH, the hydraulic impact spear worked under high pressure and using uncompressible fluid thusgreater impact energy and higher efficiency can be supported. The authors founded the dynamic simulation model of HDI-146 hydraulic impact spear. The project for solving the differential equation was suggested also. By means of virtual machine technology, the dynamic mechanism of HDI-146 can be explored and tutoring us to optimize the structural parameters can be made.  相似文献   

广州市商业型健身房空间分布及其影响因素   总被引：1，自引：0，他引：1  

王珏晗  周春山 《热带地理》2018,38(1):120-130

以百度地图网页上采集的POI数据和第六次人口普查数据为基础,借助ArcGIS 10.2和Geoda软件,通过核密度分析、方向分布分析、缓冲区分析、近邻分析和空间自相关等方法,对广州市商业型健身房的空间分布特征进行研究,结果表明：广州市商业型健身房在空间分布上呈现“中心圈层＋外围组团”结构,存在空间集聚现象以及沿城市干道和地铁站分布指向性不明显而呈现临近住宅小区分布指向性。在广州市商业型健身房空间分布的影响因素方面,经过模型比较,选择空间滞后模型对其进行定量分析,结果表明：人口规模与受教育水平对广州市商业型健身房的空间布局影响显著,而区位因素和社区环境影响力较小。  相似文献   

西藏冈底斯南带辉长岩及其所反映的壳幔作用信息   总被引：24，自引：17，他引：7  

董国臣  莫宣学  赵志丹  朱弟成  宋云涛  王磊 《岩石学报》2008,24(2)

在巨型冈底斯岩浆岩带南端产出有一个辉长岩带,与雅鲁藏布江蛇绿岩带平行共生。辉长岩带中以辉长岩为主,与冈底斯花岗质岩石空间上呈渐变过渡接触关系,表现为接触带附近岩石成分的规律变化,并出现暗色微粒包体。本文在项目组多年来对冈底斯岩浆岩带研究的基础上,对拉萨曲水县城—日喀则一带的辉长岩类进行了详细的野外观测,选择了典型露头系统采集了样品,系统的岩石学、地球化学及同位素地球化学分析和研究表明该辉长岩类的SiO_2 49%～55%、Mg~#49～66,近于原始基性岩浆,REE曲线平缓右倾,无明显负Eu异常,表明未发生明显的岩浆分异作用,其~(87)Sr/~(86)Sr比值变化在0.7036～07051、~(143)Nd/~(144)Nd为0.5128～0.5131,且ε_(Nd)为2.34～6.87,其~(206)Pb/~(204)Pb,~(207)Pb/~(204)Pb,~(208)Pb/~(204)Pb分别为17.9095,15.4986和38.0176。这些特征都表明该辉长岩属于PREMA源区物质局部熔融而成,并在上侵就位过程中受到壳源物质影响。已有SHRIMP锆石U-Pb年龄表明该辉长岩类形成于40～53Ma,与曲水岩体岩浆混合时代一致。因此可以推断印度-欧亚陆陆碰撞过程中,随着俯冲板片的折返断离,具有亏损特征的普通幔源物质在始新世局部熔融,其熔浆底侵、上升,不同程度地与壳源花岗质岩浆混合,形成冈底斯辉长岩带,其成因与大陆碰撞密切相关。  相似文献   

西藏东部嘉玉桥变质杂岩内中侏罗世高压剪切作用:来自多硅白云母的证据   总被引：5，自引：2，他引：3  

王根厚  张维杰  周详  贾建称  于海亮 《岩石学报》2008,24(2)

藏东嘉玉桥变质杂岩分布于班公错-怒江缝合带南西,出露宽度约15～20km,延伸长度约120km。藏东嘉玉桥变质杂岩与上覆中侏罗统呈滑脱断层接触,滑脱带内发育各种韧性剪切组构。滑脱带内钠长石英构造片岩中石英呈矩形条带,多硅白云母与石英矩形条带构成S-C组构,石英颗粒应变测量表明Flinn图解K=∞,代表近水平伸展滑脱。获得多硅白云母变质条件相当于蓝片岩相,压力属于高压变质相,多硅白云母测年结果为167.27±0.99 Ma,为中侏罗世高压剪切作用,暗示班公-怒江缝合带中侏罗世伸展与高压剪切作用密切相关。  相似文献   

铀矿地质科技创新指导意见     

中国核工业地质局 《铀矿地质》2008,24(1):1-4

编者按:"十五"以来,核地质系统落实了数个大型-特大型铀矿基地,开辟了一批富有远景潜力的找矿新区,2004～2007年连续荣获3项国防科技一等奖和3项国家科技进步奖,铀矿地质科技创新取得了丰硕成果,找矿实践证明了我国蕴藏有十分丰富的铀矿资源.  相似文献