油气化探同步荧光技术中的若干问题     

胡斌  李广之  程桂  袁子艳 《物探与化探》2008,32(5):470-472

在试验的基础上,对油气化探固定波长同步荧光测试技术中光谱图的认识、波长差与方法灵敏度的关系以及同步荧光与其他荧光方法的内在关系等问题作了深入的研究和探讨,澄清了该技术在实际应用工作中较易产生混淆的几个问题,旨在推动该项技术在油气化探工作中的进一步应用和发展.  相似文献   

Magnetite-Fluorite Rock: A New Rock Type of Hot Water Sedimentation     

XU Shaokang  XIA Xuehui  YUAN Congjian  WANG Bingquan  YAN Fei  YAN Shengxian  ZHENG Xingquan 《《地质学报》英文版》2008,82(4)

The new type hot water sedimentary rock - magnetite-fluorite rock occurs as quasi-layers inflat parts of contact zones between rock body and strata in Bamiaushan of Changshan County,Zhejiang Province, China. The main mineral assemblage is fluorite magnetite cassiterite. The rockshows typical laminated structure and obvious mosaic texture. Its formation temperature is between123℃-160℃, averaging at 142℃. The major chemical composition of the rock includes CaF2, SiO2,Al2O3, FeO, and Fe2O3; the high-content microelement association includes W, Sn, Be, Rb, Sr, S, andCl; and the total content of REE is low (∑REE between 35.34x10-6-38.35x10-6), showing LREEenrichment type of distribution pattern. Diagenesis: driven by the tectonic stress, the formation waterheated in the deep strata had moved along the fissures or fractures in strata and had extractedcomponents from the strata on the way, and finally stagnated in the flat parts of contact zones betweenrock body and strata. With drop in temperature, magnetite and fluorite were separated from the hotwater and precipitated alternately, forming this hot water sedimentary rock with new typemineralogical composition, typical laminated structure, obvious mosaic texture and sub-horizontaloccurrence. The characteristics of the new type mineralogical composition, sedimentary tectonicenvironment and chemical composition are different from that of the well-known traditionalhydrothermai sedimentary rocks.  相似文献   

A New Genus and Species of Sapeornithidae from Lower Cretaceous in Western Liaoning, China     

YUAN Chongxi 《《地质学报》英文版》2008,82(1):48-55

Sapeornithidae is a basal pygostylian family of Early Cretaceous primitive birds, in which only one genus and species, Sapeornis chaoyangensis, was reported before. This paper deals with a new genus and species of this family, Didactylornis jii gen. et sp. nov., which was unearthed from the Early Cretaceous Jiufotang Formation in western Liaoning. According to our phylogenetic analyses, both Didactylornis gen. nov. and Sapeornis form a sister group, which is basal to the clade formed by Confuciusornis and all the more derived birds, and more closely related to the short-tailed pygostylian birds than to the long-tailed avialian birds. The early history of pygostylian birds is poorly documented except for the studies of Confuciusornis and Sapeornis. The discovery ofDidactylornisjii gen. et sp. nov. adds the new material for the study on the early evolution of birds.  相似文献   

南海北部深水盆地沉积-构造的差异性及其油气意义   总被引：5，自引：3，他引：2  

吕宝凤  袁亚娟 《大地构造与成矿学》2008,32(4)

南海北部深水区自西向东依次分布着琼东南盆地、珠江口盆地、台西南盆地等新生代被动陆缘盆地,这些盆地经历了大致相当的从裂陷到坳陷的构造演化史,但在张裂活动过程中存在着明显的沉积-构造的差异性。构造沉降特征分析显示:在同一构造带上自西向东有盆地主要构造沉降发生的时段逐步变晚的趋势;在不同构造带上自北向南有盆地主要构造沉降发生的时段逐步变晚的趋势。这种沉积-构造的差异性对烃源岩的发育类型、分布及生储盖组合等方面有明显的控制作用,表现为:裂谷期构造沉降幅度大的盆地,陆相烃源岩发育,以陆生陆储陆盖型成藏组合为主;裂后期构造沉降幅度大的盆地,海相烃源岩发育规模较大,海生海储海盖型成藏组合及混生海储海盖型生储盖组合所占分量逐渐增多。推测渐新统湖相-湖沼相及海陆过渡相源岩和中新统海相烃源岩应是南海北部深水区油气的主要来源,陆生海储海盖型、海生海储海盖型及混生海储海盖型生储盖组合应是深水区基本生储盖组合类型。  相似文献   

The ionospheric eclipse factor method (IEFM) and its application to determining the ionospheric delay for GPS   总被引：4，自引：1，他引：3  

Y. Yuan  C. C. Tscherning  P. Knudsen  G. Xu  J. Ou 《Journal of Geodesy》2008,82(1):1-8

A new method for modeling the ionospheric delay using global positioning system (GPS) data is proposed, called the ionospheric eclipse factor method (IEFM). It is based on establishing a concept referred to as the ionospheric eclipse factor (IEF) λ of the ionospheric pierce point (IPP) and the IEF’s influence factor (IFF) . The IEF can be used to make a relatively precise distinction between ionospheric daytime and nighttime, whereas the IFF is advantageous for describing the IEF’s variations with day, month, season and year, associated with seasonal variations of total electron content (TEC) of the ionosphere. By combining λ and with the local time t of IPP, the IEFM has the ability to precisely distinguish between ionospheric daytime and nighttime, as well as efficiently combine them during different seasons or months over a year at the IPP. The IEFM-based ionospheric delay estimates are validated by combining an absolute positioning mode with several ionospheric delay correction models or algorithms, using GPS data at an international Global Navigation Satellite System (GNSS) service (IGS) station (WTZR). Our results indicate that the IEFM may further improve ionospheric delay modeling using GPS data.  相似文献   

珲春中部土壤常量元素地球化学特征   总被引：4，自引：1，他引：3  

LI Yue-fen  王冬艳  LIU Shuang  曹鹏  SHANG Yuan 《世界地质》2008,27(2)

采用XRF-X荧光光谱法,研究了吉林省珲春中部常量元素在表层土壤中的含量以及在土壤剖面中的迁移分布等土壤地球化学特征.结果表明:表层土壤中MgO(0.85%)、CaO(0.95%)的含量平均值低于全国土壤平均值(分别为1.8%和3.2%),Fe2O3(3.41%)、K2O(2.61%)、Al2O3(13.33%)、SiO2(69.25%)含量平均值与全国平均值基本相当(分别为3.40%,2.50%,12.60%和65.00%),Na2O(1.83%)含量平均值高于全国平均值(1.60%).暗棕壤和白浆土两种类型土壤剖面常量元素组成差别不大,在垂向上呈现出不同的规律性.Sa、Saf和ba指标反映出暗棕壤土壤的风化淋溶度略强于白浆土,在剖面不同层次上,随土壤深度的增加,Sa和Saf呈现下降的趋势,而表层土壤的ba值比深层土壤高.  相似文献   

Characteristics of fluid inclusions from Huangbuling gold deposit in northwestern Jiaodong and their significance in metallogenic prognosis     

ZHANG Yuan  SUN Jing-gui  WANG Ke-yong  QIU Dian-ming 《世界地质》2008,27(3)

  相似文献   

太湖入湖河道沉积物中生物利用磷和营养水平分析   总被引：7，自引：0，他引：7  

袁旭音  李兵  许薇薇  陈颖 《地学前缘》2008,15(5):212

为了解太湖入湖河道的营养状况,研究了太湖西部河流沉积物生物利用磷的组成与分布。研究结果显示,北部沉积物中营养元素较高,南部较低;沉积物中生物利用磷的含量次序为藻类可利用磷(AAP)>NaHCO3提取磷(OLP)>水溶性磷(WSP)>易解吸磷(RDP),其中AAP是重要的生物利用磷,AAP的比例越高,富营养化程度越高。AAP与营养元素的相关性在不同区域河道有所不同,北部河道与总氮(TN)、总磷(TP)相关性较好,中部和南部河道与沉积物有机质总量(TOM)相关性较好。沉积物的生物利用磷受不同污染源影响较大。对比河道沉积物与湖泊沉积物的特征,发现湖泊沉积物中生物利用磷(BAP)/总磷(TP)、藻类可利用磷(AAP)/总磷(TP)都高于河道沉积物,表明湖泊沉积物中的磷更容易被植物吸收。  相似文献   

湖南万古金矿地质地球化学特征及其成因探讨   总被引：3，自引：0，他引：3  

袁兰陵  季玮 《华南地质与矿产》2008,(3)

万古金矿位于江南古陆金成矿带中段的湘东北金成矿区.地质地球化学研究表明,万古金矿的成矿作用受区域构造控制,NE向断裂断为主要控矿构造,含矿构造是低序次的NWW向扩容断裂构造;成矿物质具有多源性,成矿流体具有岩浆水与变质水的混合水特征.结合区域大地构造背景的分析,认为在中生代中国东部受太平洋板块向西俯冲的影响,形成一系列NE向大断裂,万古金矿的形成与NE向长平大断裂密切相关,携带成矿物质的深部流体沿该断裂上升与浅部残余变质热液混合,并通过淋滤抽提地层中的成矿物质,使流体系统中的成矿物质不断富集,最终在适宜的温压条件下于剪切扩容空间中沉淀成矿.  相似文献   

禹城市城乡用地结构和布局分析     

张霞  马淑玲  刘侠  苑金环 《山东地质》2008,24(2):24-27

统筹城乡用地、优化城乡用地结构和布局,既是节约和集约用地的重要途径,又是统筹城乡发展的客观需要。通过分析禹城市城乡用地结构和布局,提出优化城乡用地结构和布局的建议和对策,从而为制定合理的土地利用总体规划提供基本的依据。  相似文献