内蒙古碾子沟钼矿床成矿流体来源、演化及成矿机理     

孙丰月  王睿  王一存  李顺达  王可勇  石开拓  孙清飞  王文元 《吉林大学学报(地球科学版)》2020,50(3):768-780

内蒙古自治区碾子沟钼矿床地处华北地台北缘西拉木伦钼成矿带西段，为一典型的中型石英脉型钼矿床。该钼矿床矿脉（体）主要产于燕山早期二长花岗岩-钾长花岗岩内NNW、NW向断裂构造体系之中，成矿作用过程经历了黄铁矿±辉钼矿＋石英（Ⅰ）、辉钼矿＋黄铁矿±黄铜矿＋石英（Ⅱ）、黄铜矿＋黄铁矿±闪锌矿＋石英（Ⅲ）及石英±方解石（Ⅳ）4个阶段。系统的流体包裹体岩相学、包裹体组分析、包裹体显微测温研究表明，矿床初始成矿流体为高温、中低盐度（490~550℃，盐度（w（NaC1））2%~10%，50~62 MPa）均匀的NaCl-H₂O体系热液，δ¹⁸O_H2O-SMOW（2.21‰）及δD_H2O-SMOW（-68.9‰）表明其主要来源于岩浆热液；成矿流体上升并不断汇聚于容矿断裂空间，伴随温度、压力降低（380~460℃，26~40 MPa→360~420℃，25~30 MPa）而进入两相不混溶区，流体开始发生沸腾→强烈沸腾作用，导致成矿元素Mo大量沉淀富集成矿，成矿晚期残余流体与大气降水混合（δ¹⁸O_H2O-SMOW为-2.41‰~2.51‰，δD_H2O-SMOW为-110.1‰~-105.5‰），矿床属燕山早期中高温岩浆热液型钼矿床。  相似文献   

绿色空间对休闲性体力活动影响的社区分异 ——以广州市为例     

戴颖宜  朱战强  周素红 《热带地理》2019,39(2):237-246

以广州市20个典型社区为例，构建多元线性回归模型，探讨了绿色空间对居民休闲性体力活动的影响，并剖析绿色空间对不同类型社区居民休闲性体力活动影响的作用机制。结果发现：1）不同类型社区居民的休闲性体力活动水平存在明显差异，低档社区的为782.99 MET-min/w，中档社区的为871.70 MET-min/w，高档社区的为1 227.91 MET-min/w；2）影响不同类型社区居民休闲性体力活动水平的绿色空间因素有所不同，低档社区、中档社区和高档社区的显著因子分别为“到最近公园广场距离”“邻里绿化覆盖率”和“健身活动设施数量”；3）绿色空间对休闲性体力活动水平影响的作用机制存在社区差异，低档社区居民休闲性体力活动主要受到成本作用的约束，中档社区居民主要受绿化环境作用影响，而高档社区居民主要受机会作用影响。  相似文献   

地震异构云管理平台的技术架构设计     

郭凯  姜立新  刘晓雨  班世敏 《中国地震》2020,36(1):153-161

基于Open Stack的开源标准体系,结合中国地震台网中心和中国地震局第二监测中心的云基础设施现状,设计两级云管理架构,以异构云管理平台作为综合管理平台,纳管区域云管理平台,以统一门户的方式对地震行业云计算资源进行统一管理;通过容器化部署异构云管理平台,初步实现对地震行业云计算资源的统一监控和运行管理。  相似文献   

晋北煅烧高岭土用煤矸石的应用矿物学特征   总被引：1，自引：0，他引：1  

侯龙超  王哲皓  汪灵  周东晓 《矿物学报》2020,(2):149-154

为了给晋北煅烧高岭土用煤矸石的评价和开发利用提供科学依据,采用XRD、XRF、SEM和白度计等现代分析测试技术,研究了晋北煅烧高岭土用煤矸石的应用矿物学特征。结果表明:1)根据造纸和涂料用煅烧高岭土的国家标准,晋北煤矸石主要可分为3种类型:合格原料、基本合格原料和不合格原料。2)与合格和基本合格原料相比,不合格原料煅烧产物的化学成分中SiO2、Al2O3、Fe2O3含量以及碱金属与碱土金属总含量都与前者有较大差异。3)合格和基本合格原料主要由高岭石(85%~94%)组成,不合格煤矸石矿物组合为高岭石(30%~60%)+石英(23%~38%)+伊利石(14%~26%),并含少量黄铁矿和白云石等杂质矿物,石英等杂质矿物和含铁矿物是分别导致煅烧产物化学成分和白度不合格的主要原因。4)合格原料中高岭石结晶度较好,主要为不规则片状、书册状和弯曲片状,片表面光滑,片径大小范围较大,为0.05~51.22μm,平均2.80μm,径厚比41.24。  相似文献   

Effect of Shale Reservoir Characteristics on Shale Oil Movability in the Lower Third Member of the Shahejie Formation,Zhanhua Sag     

NING Chuanxiang  MA Zhongliang  JIANG Zhenxue  SU Siyuan  LI Tingwei  ZHENG Lunju  WANG Guozhen  LI Fengxun 《《地质学报》英文版》2020,94(2):352-363

To reveal the effect of shale reservoir characteristics on the movability of shale oil and its action mechanism in the lower third member of the Shahejie Formation(Es3l), samples with different features were selected and analyzed using N2 adsorption, high-pressure mercury injection capillary pressure(MICP), nuclear magnetic resonance(NMR), high-speed centrifugation, and displacement image techniques. The results show that shale pore structure characteristics control shale oil movability directly. Movable oil saturation has a positive relationship with pore volume for radius > 2 μm, as larger pores often have higher movable oil saturation, indicating that movable oil is present in relatively larger pores. The main reasons for this are as follows. The relatively smaller pores often have oil-wetting properties because of organic matter, which has an unfavorable effect on the flow of oil, while the relatively larger pores are often wetted by water, which is helpful to shale oil movability. The rich surface provided by the relatively smaller pores is beneficial to the adsorption of immovable oil. Meanwhile, the relatively larger pores create significant pore volume for movable oil. Moreover, the larger pores often have good pore connectivity. Pores and fractures are interconnected to form a complex fracture network, which provides a good permeability channel for shale oil flow. The smaller pores are mostly distributed separately;thus, they are not conducive to the flow of shale oil. The mineral composition and fabric macroscopically affect the movability of shale oil. Calcite plays an active role in shale oil movability by increasing the brittleness of shale and is more likely to form micro-cracks under the same stress background. Clay does not utilize shale oil flow because of its large specific surface area and its block effect. The bedding structure increases the large-scale storage space and improves the connectivity of pores at different scales, which is conducive to the movability of shale oil.  相似文献   

东海盆地中、新生代盆架结构与构造演化   总被引：6，自引：0，他引：6  

刘金水  许怀智  蒋一鸣  王军  何新建 《地质学报》2020,94(3):675-691

基于地貌、钻井、岩石测年和地震等资料,分析盆地地层分布、盆架结构、构造单元划分和裂陷迁移规律,结果表明东海盆地由台北坳陷、舟山隆起、浙东坳陷、钓鱼岛隆褶带和冲绳坳陷构成,是以新生代沉积为主、中生代沉积为辅的大型中、新生代叠合含油气盆地;古元古代变质岩系构成了盆地的基底。该盆地不仅是印度-太平洋前后相继的动力体系作用下形成的西太平洋沟-弧-盆构造体系域一部分,而且也是古亚洲洋动力体系作用下形成的古亚洲洋构造域和特提斯洋动力体系作用下形成的特提斯洋构造域一部分,晚侏罗世至早白垩世经历了构造体制转换,盆地格局发生重大变革,早白垩世以前主要受古亚洲-特提斯洋构造体制影响的强烈挤压造山和地壳增厚作用演变为早白垩世以来主要受太平洋构造体制控制的陆缘伸展裂陷和岩石圈减薄作用,经历侏罗纪古亚洲-特提斯构造体制大陆边缘拗陷和白垩纪以来太平洋构造体制弧后裂陷两大演化阶段。白垩纪以来太平洋构造体制的弧后裂陷演化阶段可细分为早白垩世至始新世裂陷期、渐新世至晚中新世拗陷期和中新世末至全新世裂陷期。  相似文献   

Evaluation of urban underground space resources using a negative list method: Taking Xi’an City as an example in China     

《China Geology》2020,3(1):124-136

Utilization of urban underground space has become a vital approach to alleviate the strain on urban land resources, and to optimize the structure and pattem of the city. It is also very important to improve the city environment, build livable city and increase the capacity of the city. Based on the analysis of existing evaluation methods and their problems, a method for evaluating underground space resources based on a negative list of adverse factors affecting underground space development is proposed, to be primarily used in urban planning stages. A list of the adverse factors is established, including limiting factors, constraining factors and influencing factors. Taking Xi’an as an example, using a geographical information system platform, a negative list of adverse factors for the underground space resources in Xi’ an City are evaluated, and preventive measures are proposed. Natural resources, exploitable resources, and the potential growth of exploitable underground space resources are evaluated. Underground space assessment in the different development stages of the city, collaborative utilization and safety evaluation for multiple subsurface resources, environmental impact and assessment, as well as evaluation methods based on big data and intelligent optimization algorithms are all discussed with the aim of serving city planning and construction.  相似文献   

Exploration prospects of oil and gas in the Northwestern part of the Offshore Indus Basin,Pakistan     

《China Geology》2020,3(4):633-642

Oil and gas resources are short in Pakistan and no commercially viable oil and gas sources have been yet discovered in its offshore areas up to now. In this study, the onshore-offshore stratigraphic correlation and seismic data interpretation were conducted to determine the oil and gas resource potential in the Offshore Indus Basin, Pakistan. Based on the comprehensive analysis of the results and previous data, it is considered that the Cretaceous may widely exist and three sets of source rocks may be developed in the Offshore Indus Basin. The presence of Miocene mudstones has been proven by drilling to be high-quality source rocks, while the Cretaceous and Paleocene–Eocene mudstones are potential source rocks. Tectonic-lithologic traps are developed in the northwestern part of the basin affected by the strike-slip faults along Murray Ridge. Furthermore, the Cretaceous and Paleocene–Eocene source rocks are thick and are slightly affected by volcanic activities. Therefore, it can be inferred that the northwestern part of Offshore Indus Basin enjoys good prospects of oil and gas resources.  相似文献   

湍流度随高度的变化及其对城市宏观地形的依赖     

李大全  孙武  欧阳睿康  黄盛  高梦媛  李庆祥  黄启明 《热带地理》2019,39(3):365-376

分别构建广州主建成区垂直比例尺为1﹕2 000、1﹕1 000和1﹕500的3个建筑物模型，利用大型边界层风洞，在西北和东南两风向下，基于中性流模拟分析了复杂城市地形下湍流度随高度的变化及其对宏观地形的依赖。结果表明：风廓线指数α与不同高度的湍流度之间的关系密切，利用现有模型，根据4类粗糙度边界层和不同垂直比例尺，可确定相应的湍流度随高度变化模型的主要系数，预测精度高。城市地形下最大湍流度面发育在0~0.2 h之间狭窄的范围内。用湍流度形态指数β来表征湍流度随高度的变化，无论城市屋脊还是平坦地形，随着风程区的延伸，廓线的指数α升高，湍流度形态指数β降低。表明同一高度湍流度值具有由迎风区、丘顶区向背风区增高，沿风程逐渐增大的规律，对地形部位和风程的依赖性强，与来流翻越简单地形时的特征一致。  相似文献   

九寨沟国家级自然保护区长海夏季浮游植物群落结构及生态评价     

邢冰伟  徐季雄  曹玥  邓贵平  庞婉婷  王全喜 《湖泊科学》2020,32(4):1088-1099

高山湖泊对于全球气候变化及人类影响是一个极为敏感的参照系统.九寨沟国家级自然保护区长海作为一个独特的高山湖泊,研究其浮游植物群落结构及其与环境的关系,评估其水质现状及影响因素,有着重要的意义.本文于2014年7月对长海浮游植物群落结构进行了研究.全湖共布设12个采样点,并在中心采样点进行了垂直分层采样.本次调查共发现浮游植物6门38属63种,平均丰度为6.98×10~5cells/L,平均生物量为0.31 mg/L.浮游植物的水平分布差异不大;在垂直分布上,浮游植物的丰度从表层0.5 m至水下50 m呈现先增加后减少的趋势,在20 m水深处达到最大.长海浮游植物的优势种是长海小环藻(Cyclotella changhai)和飞燕角甲藻(Ceratium hirundinella),长海小环藻数量较多,飞燕角甲藻生物量较大.长海浮游植物多样性指数较低,综合各类水质评价方法,可以得出九寨沟长海处于贫-中营养状态.  相似文献