隆起对砂岩型铀矿成矿的控制及找矿启示     

聂逢君  杨舒琪  封志兵  夏菲  罗敏  王守玉  张博程 《地球学报》2024,45(3):265-277

沉积盆地古隆起对油气成藏起到明显控制作用,对砂岩型铀矿成矿的制约也不可忽视。砂岩型铀矿通常就位于盆地边缘构造斜坡带和盆地内部隆起附近。隆起对砂岩型铀矿成矿的控制具体体现在:控制地下水补-径-排体系、控制层间氧化作用、控制沉积相带发育、伴生断裂促进物质输运以及为成矿供给铀等。中国北方沉积盆地中新生代以来经历复杂的构造活动,盆地域内非均衡发展而多形成隆起,因此我国铀矿找矿尤其需要重视隆起对铀成矿的控制。其中,盆地内部找矿应重点关注被大幅抬升的隆起,而盆地边缘构造斜坡带上找矿需重视微隆起以及基底上覆地层的褶皱。将隆起作为关键控矿要素,优选适用的攻深找盲方法,精细刻画盆地基底隆升形成的背斜、褶皱及伴生断裂,可有效提高铀矿找矿效率并拓展铀矿找矿空间。  相似文献   

高分五号高光谱影像矿物精细识别   总被引：2，自引：2，他引：0  

董新丰  甘甫平  李娜  闫柏琨  张磊  赵佳琪  于峻川  刘镕源  马燕妮 《遥感学报》2020,24(4):454-464

矿物识别是高光谱遥感技术优势之一,已在地质矿产领域取得了显著应用效果。随着光谱分辨率的不断提高,高光谱遥感矿物识别逐渐从识别矿物种类向矿物亚类、矿物成分等精细信息识别发展,且随着应用实践的不断深入,对矿物精细信息的需求也越来越大。而光谱分辨率和矿物识别方法是制约高光谱矿物精细识别的主要因素。高分五号(GF-5)超高的光谱分辨率为矿物精细识别提供了可能。首先在分析总结已有高光谱矿物识别方法优缺性的基础上,提出了综合光谱特征增强匹配度和特征参量的矿物识别方法;其次,选取甘肃柳园和美国Cuprite两个研究较多的地区为研究对象,基于GF-5卫星数据开展了矿物精细识别,在完成矿物种类、亚类识别的基础上,进一步对绢云母成分信息进行了反演;最后,结合上述地区已有机载高光谱数据及填图结果开展对比分析。结果表明:GF-5矿物识别信息分布与机载HyMap、AVIRIS一致性很好,相较机载数据GF-5矿物识别平均正确率优于90%,说明本研究提出的矿物识别方法能够满足GF-5矿物精细识别,可为后续业务化应用提供技术支撑,同时认为超高的光谱分辨率使得GF-5在矿物成分信息识别上更具优势。  相似文献   

Spatial characteristics and driving forces of the morphological evolution of East Lake,Wuhan     

陈昆仑  刘小琼  陈溪  郭宇琪  董寅 《地理学报(英文版)》2020,30(4):583-600

The shapes of the urban lakes in Wuhan city have been strongly influenced by the rapid industrialization and urbanization experienced in recent decades.Based on topographic maps and remote sensing images,the temporal and spatial changes of East Lake,Wuhan city,over the past two decades were analyzed.The landscape shape index(LSI)and centroid method were applied to analyze the evolution of lake morphology and its causes.Several key results were obtained.(1)The surface area of East Lake decreased sharply by 2.13 km2 from 1995 to 2005,and slightly by 1.00 km2 from 2005 to 2015.The shoreline length of East Lake displayed a continuous trend of decline during the study period:The length reduced by 21.89 km from 1995 to 2005,and by 0.67 km from 2005 to 2015.The LSI values,7.04(1995),6.46(2005),and 6.28(2015),displayed an accelerated downward trend,indicating a reduction of complexity in East Lake and the intensification of manual interventions in the water body.(2)The changes to East Lake displayed a clear temporal and spatial heterogeneity.The centroid of East Lake moved northeast from 1995 to 2005 and southeast from 2005 to 2015.(3)The reduction in the area of East Lake was mainly affected by human activities.A lake area of about 4.8 km2 was converted to other land uses during 1995-2005,most of which was unused land,whereas from 2005 to 2015,0.43 km2 of the lake area was converted into built-up land,and 0.25 km2 was converted into other land uses.The reduction in area was caused by infrastructure construction by the government,the development of the real estate industry,illegal construction by villagers,and the development of scenic spots for tourism.The driving forces of this reduction included Wuhan's growing population,and the rapid development of the economy and urbanization between 1995 and 2015,which has resulted in a large demand for land.Finally,a formation mechanism model was constructed by analyzing the causes of East Lake's morphological evolution.  相似文献   

刺参吐脏再生对胰蛋白酶活性影响的研究     

王思思  李雪琪  高勤峰  董双林  孙永军  鞠文明 《中国海洋大学学报(自然科学版)》2019,(Z1)

本实验研究了吐脏及再生过程对刺参(Apostichopus japonicus Selenka)生长、消化生理及体成分的影响。实验分两个阶段,阶段一刺参被投喂通过添加鱼粉提高蛋白水平的饲料56 d,阶段二设置4个处理组,进行转食低蛋白饲料处理(转食单处理组)、吐脏处理(吐脏单处理组)、吐脏后转食低蛋白饲料处理(吐脏转食组)或不做处理(对照组),饲养100 d,并测定刺参的特定生长率(SGR)、胰蛋白酶活性和体壁蛋白含量。结果表明:(1)吐脏处理后刺参SGR呈明显的时间变化,前28 d呈现负增长,第28～42天恢复正生长,并于第56天后出现快速补偿生长,显著高于未吐脏刺参(P0.05)。(2)高蛋白饲料更有利于刺参吐脏后的再生恢复,吐脏处理对刺参整体实验阶段的SGR无显著性影响(P=0.271),但会显著提高体壁蛋白含量(P0.05)。(3)对照组刺参酶活性随时间平稳波动;转食单处理组刺参酶活在转食低蛋白饲料后前35 d始终高于对照组且呈现波动下降,并于第49天后持续低于对照组,呈现出具有规律的蛋白酶可塑性;吐脏处理组,刺参吐脏后第28天已再生出完整的新生肠道,新生肠道前期并不具有胰蛋白酶可塑性,直至再生后第70天方观察到消化酶对饲料的适应性调节。本研究结果表明:刺参吐脏再生过程能显著影响刺参的生长及消化生理,吐脏后42 d可从生长及酶活角度认为其新生肠道已具有与未吐脏肠道一样的消化能力,但吐脏后70 d方能观察到新生肠道的可塑性表现,研究结果将有助于进一步探讨刺参吐脏后肠道的修复能力,为刺参养殖提供一定的理论依据。  相似文献   

喀斯特地区春季土壤水分空间插值方法对比   总被引：1，自引：0，他引：1  

孙智妍  周秋文  张思琪  韦小茶  马龙生 《热带地理》2019,39(5):770-779

以杨眉河小流域为研究区,通过土壤水分采样,选取辅助变量,采用普通克里金、协同克里金、回归克里金3种地统计学方法对土壤水分数据进行空间插值。结果表明：1）回归克里金对研究区土壤水分估算误差最小,其次为协克里金,普通克里金的误差最大;2）普通克里金生成的土壤水分表面最为平滑,而回归克里金最大程度反映了研究区实际的土壤水分空间变化;3）对于协同克里金,以湿度指数（WI）样点数据作为辅助变量的估算误差小于将WI栅格数据作为辅助变量的估算误差。总之,在可获得有效辅助变量的条件下,回归克里金对研究区土壤水分估算的效果优于协同克里金与普通克里金。  相似文献   

换流站激光点云精度评价分析     

杜晓磊  李東洋  胡博  王瑞琪  俞忠伟 《北京测绘》2019,33(7)

  相似文献   

板桥－合水地区长８１ 储层不同类型成岩相孔隙结构特征及生产动态分析          下载免费PDF全文

吴育平  孙卫  欧阳思琪 《地质科技通报》2018,37(6):122-129

通过铸体薄片、扫描电镜和 X衍射等方法将板桥－合水地区长８１ 储层成岩相划分为６类,并应用压汞及油水相渗等实验系统地分析了不同类型成岩相孔隙结构及渗流机理,在此基础上,结合实际生产资料,对各类成岩相的生产动态特征进行了分析.结果表明:长石溶蚀－残余粒间孔相为优势成岩相,其储集空间发育,孔喉比小且连通性好,油水之间流动干扰弱,初期日产油量较高,低含水期稳产周期长,注水开发效果好;而劣势成岩相,如水云母胶结相,尽管孔隙也发育,但孔喉比大且连通性差,导致储层渗流能力差,含水率上升快且稳产期短,注水开发效果差,建议对其采取适当措施降低储层非均质性或者调整开发方案,从而提高最终采收率.   相似文献   

Testing phenanthrene distribution properties of virgin plastic pellets and plastic eroded pellets found on Lesvos island beaches (Greece)     

Karapanagioti HK  Klontza I 《Marine environmental research》2008,65(4):283-290

Plastic pellets have been characterized as toxic pollutant carriers throughout the world oceans and coastal zones. However, their sorptive properties are not yet well understood. In the present study, virgin pellets and plastic eroded pellets (PEP) are used to elucidate their distribution characteristics through distribution kinetic studies. Distribution occurs through diffusion into the pellet for all materials (polyethylene, polyoxymethylene, and PEP) except polypropylene (PP). Although diffusion into the polymer happens with similar rates for both freshwater and saltwater external solutions, apparent diffusion is dependent on the solution salinity because it results in higher equilibrium distribution coefficients. Distribution coefficient into the PEP is higher and diffusion is slower than into the virgin materials. This is attributed to increased crystallinity of the PEP due to weathering. PP demonstrates diffusion rates that are increased by salinity and is apparently faster than into the other polymers suggesting a surface diffusion process.  相似文献   

Quantum reflection as the reflection of subwaves     

袁文  殷澄  王贤平  曹庄琪 《海洋学报(英文版)》2010,29(9)

This paper studies quantum reflection with recent research on reflection coefficient. Based on the analytical transfer matrix method, a novel explanation for this phenomenon is proposed that quantum reflection is the reflection of subwaves, which originate inherently from the inhomogeneity of the fields and is always neglected in the semiclassical regime. Comparison with exact formula and the numerical calculations for different potentials has confirmed the reliability and the validity of the proposed theory.  相似文献   

中华鳖（Pelodiscus sinensis）不同种群酪氨酸酶（TYR）基因的克隆及其多态性分析   总被引：1，自引：0，他引：1  

张永正  张海琪  黄利英  丁诗华 《海洋与湖沼》2009,(3)

以中华鳖4个种群80个个体（太湖种群、日本品系种群、台湾引进种群和“清溪乌鳖”种群）肌肉基因组DNA为模板,利用已知酪氨酸酶（Tyrosinase,TYR）基因部分序列设计合成特异引物进行PCR扩增,克隆并测定了TYR基因的核苷酸序列。扩增所得的696bp序列中共有13个多态性核苷酸位点。中华鳖体色变异种群的3个个体均在第186核苷酸位点出现相同的变异。以此设计酶切位点,选用SmaⅠ内切酶进行RFLP,结果显示80个中华鳖个体的TYR基因存在多态性。AA型基因除在中华鳖体色变异种群内未发现外,其余三个种群内的频率大小顺序为日本品系种群（60％）〉台湾引进种群（30％）〉太湖种群（20％）,以省外品种为丰富;AB基因型频率大小顺序为“清溪乌鳖”种群（70％）〉台湾引进种群（50％）〉太湖种群（40％）〉日本品系种群（30％）。  相似文献