从地形变资料探讨丽江7.0级地震的前兆特征

讨论了地震孕育发生的物理机制是“拉疏隆起－压缩凹陷”模式的形成机理及其特征;根据这一理性认识,应用丽江７．０级地震之前滇西地区的地形变资料,较确切出得出了本区有强震发生,并且可以认为孕震体是在丽江至玉龙雪山东麓地区;根据发震前夕所观测到孕震体的“拉疏隆起－压缩凹陷”的区域大小与幅度值及岩层的弹性应变,可近似计算震级的大小。     

1998年11月19日云南宁蒗6.2级地震前地震活动性特征

１９９８ 年１１ 月１９ 日在云南省宁蒗发生了一次 Ｍ６２ 级强烈地震。该次地震前, 震中及邻区地震活动明显增强, 累计频度和应变能释放随时间从线性缓慢增加变为非线性快速增加, 出现孕震空区、多项地震活动参数异常。此外, 地震活动性诸多参数在地震活动处于线性缓慢变化的时间段内, 在空间分布上表现为随机的现象; 在地震活动处于非线性快速变化的时间段内, 这些参数的空间分布表现出向未来震中收缩、集中的明显特征。     

地震期间的地磁脉动效应

１９９６年１１月１７日至１１月２９日在新疆喀仁地区８次地震期间观测到的震前发生的高频地磁脉动现象,文中对每次地震前的Ｐｃｌ－２脉动的形态,以及脉动的起动时刻,持续时间,Ｈ分量和Ｄ分量的平均振幅随北京地方时的分布进行了详细研究分析,对这种震前观测到的高频地磁脉动的激发机制也做了深入的讨论,事实表明,这种震前发生的高频地磁脉动的地震的短期预报上可能有广泛的应用前景。     

Preliminary study on radiocarbon AMS dating of pollen

17 samples were collected from aeolian and lacustrine profiles within the environment sensitive zone of the Loess Plateau, and an experimental method was established which is suitable for pollen extraction from aeolian sediment. A comparative study of pollen dating was carried out using the accelerator mass spectrometry (AMS)¹⁴C dating of known age samples, and then an experiment with the pollen concentrates was performed. The results indicate that pollen that has been deposited simultaneously with sediment in a stable environment can provide reliable ages. This technique will provide a way of improving the chronological framework for the Loess Plateau since the late Pleistocene. The^I4c dating was combined with field investigations, and from the geological record within this zone, evidence was extracted of four major monsoon precipitation changes during the transition from the late Pleistocene to Holocene. Project supported by the National Natural Science Foundation of China (Grant Nos. 49894170, 49725308), Chinese Academy of Sciences (Nos. KZ-951-A1-402& KZ-952-S1-419), and State Committee of Science and Technology of China.     

Hydrogen and oxygen isotope studies of metamorphic fluid-rock interactions in the Dabie Mountains

Hydrogen and oxygen isotope studies were carried out on mineral separates from high to ultrahigh pressure metamorphic rocks at Huangzhen and Shuanghe in the eastern Dabie Mountains, East China. The δ¹⁸O values of eclogites cover a wide range of −5‰ to+9‰, but the δD values of micas fall within a narrow range of −85% to −70‰. Both equilibrium and disequilibrium oxygen isotope fractionations were observed between quartz and the other minerals, with reversed fractionations between omphacite and garnet in some eclogite samples. The δ¹⁸ O values of −5‰ to −1‰ for some of the eclogites represent the oxygen isotope compositions of their protoliths which underwent meteoric water-rock interaction prior to plate subduction. The preservation of oxygen isotope heterogeneity in the eclogites implies a channelized flow of fluids during progressive metamorphism caused by rapid subduction. Retrograde metamorphism has caused oxygen and hydrogen isotope disequilibria between some of the minerals, but the fluid for retrograde reactions was internally buffered in the stable isotope compositions. Project supported by the Chinese Ministry of Science and Technology (Grant No. 95-Pre-39), the National Natural Science Foundation of China (Grant Nos. 49794042, 49473173 and 49453003) and the Chinese Academy of Sciences (Grant No. KZ951-A1-401-5)     

新疆乌鲁木齐台地电阻率变化及震兆特征

以乌鲁木齐地电阻率观测资料为依据,在展示其变化特征的基础上,对该地电阻率资料异常变化与近区中强地震及部分远区的大地震之间的关系进行了归纳、分析与讨论。对地电阻率前兆异常形态与地震之间的关系进行了探讨。     

矿产资源评价中的成矿信息提取与综合技术

矿产资源评价就是运用最新的成矿理论及评价技术对地质调查所获取的信息资料进行了全面的综合分析,科学地评价矿产在位置,数量,质量等,国际地科联于７０年代推广６种基本矿放资源评价方法以来,矿产资源评价理论技术得到了很大发展,同时现代矿产勘查积累了大量的找矿资料,如何在新的成矿理论指导下,使这些宝贵资料在成矿分析中发挥最大效能是一项重要课题,本文综述了目前成矿信息提取与综合的研究现状,并讨论了相应的几个问     

贻贝超氧化物歧化酶的分离纯化和部分性质

采用热变性－硫酸铵分级沉淀－Ｓｅｐｈａｄｅｘ Ｇ－１００和ＤＥ５２柱层析的方法从贻贝中分离纯化铜锌超氧化物歧化酶,并对其部分性质进行分析鉴定。结果该酶的比活力为９４５３．３Ｕ／ｍｇ（ｐｒｏｔｅｉｎ）,提纯倍数为６０９．９,对ＫＣＮ和Ｈ２Ｏ敏感,Ｔ氏液和ＳＤＳ对酶活性没影响,对热较稳定。     

青岛滨海地质旅游

青岛滨海旅游具有丰富的地质资源,合理地开发会使其具有专业特色,娱乐性和趣味性。滨海地质旅游将促进旅游业的发展,在向现代化国际城市中发挥作用。     

鲈鱼苗烂鳃、烂尾病病原菌的研究

１９９７年４～５月,对花鲈（Ｌａｔｅｏｌａｂｒａｘｊａｐｏｎｉｃｕｓ）鱼苗期细菌性烂鳃和烂尾病的病原菌进行了研究。从具有明显症状的病鱼的病灶组织分离到２株致病菌Ｃ－１和Ｗ－１,经人工感染及从人工感染发病鱼体再分离的Ｗ－４和Ｗ－５菌株的再感染试验结果表明,所分离的细菌为鲈鱼苗烂尾,烂鳃病的致病菌。经６４项生物学特性,生理生化特征测试结果表明,这４株菌可归为一类,同属于鳗弧菌（Ｖｉｂｒｉｏａｎｇｕｉｌａｒｕｍ）。药敏试验结果表明,痢特灵、ＣＩＮ１００、ＭＥＬ２５、呋喃妥因、氯霉素、磺胺药＋ＴＭＰ和美洛西林等７种药物对病原菌有显著的抑制作用。