Tidal effects on temperature front in the Yellow Sea

Temperature front (TF) is one of the important features in the Yellow Sea, which forms in spring, thrives in summer, and fades in autumn as thermocline declines. TF intensity ⋎S _T ⋎ is defined to describe the distribution of TF. Based on the MASNUM wave-tide-circulation coupled model, temperature distribution in the Yellow Sea was simulated with and without tidal effects. Along 36°N, distribution of TF from the simulated results are compared with the observations, and a quantitative analysis is introduced to evaluate the tidal effects on the forming and maintaining processes of the TF. Tidal mixing and the circulation structure adapting to it are the main causes of the TF. Supported by the National Basic Research Program of China (No. G1999043809) and the National Science Foundation of China (No. 49736190).     

青海省兴海7.0级地震前兆

介绍了青海省兴海７．０级地震前水氡，地下水位，地表形变，地震活动性，气象及动物等出现的异常，并对震前的预报作了简介。     

云南点苍山冰川湖泊沉积物磁化率的影响因素及其环境意义

文章通过对点苍山海拔3820m冰水沉积剖面的粒度参数、磁化率、氧化铁含量和有机质含量的综合实验分析,并讨论了这些指标的相互关系及其环境意义。实验结果表明,磁化率的强度与粗砂组分的含量成正相关,而与粘土等细粒组分含量成负相关;同时与有机质含量成负相关,与氧化铁含量成正相关。矿物组分分析实验表明,沉积物主要磁性来源于磁化铁。根据以上结果,结合冰川湖泊流域面积小、高寒环境的特点,其磁化率的影响因素与一般湖泊不同,认为冰川湖泊沉积中,因为物源较近导致外源磁性矿物主要赋存于粒度较粗的碎屑颗粒中,而高寒的环境条件使得有机质对沉积物的磁性矿物起到了稀释的作用,而很难有积极的贡献。根据磁化率的环境意义,恢复了全新世以来点苍山的古气候,从中可以划分6个不同的气候阶段:11.5～10.6kaB.P.,10.6～8.9kaB.P.,8.9～5.5kaB.P.,5.5～3.3kaB.P.,3.3～0.8kaB.P.和0.8kaB.P.至今,代表了末次冰期结束以后湖泊从产生至消亡的全过程。根据与其他相关地区的对比,分析了西南季风演变的一些规律。     

辽东石庙沟岩体岩石地球化学特征、锆石U-Pb年龄、Hf同位素及其地质意义

辽东石庙沟地区位于华北陆块东部的辽吉造山/活动带上,该带经历了十分复杂的构造演化过程,记录了多期岩浆-构造-变质事件。石庙沟岩体为花岗斑岩,富SiO₂、Na₂O和K₂O,贫CaO、MgO及Al₂O₃,亏损高场强元素（Nb、Ti、Ta、P）,富集大离子亲石元素（K、Rb、Ba、U）,A/CNK值大于1,REE配分曲线呈"海鸥"式分布,以具有显著的负Eu异常为特征,高Ga/Al值,与典型A型花岗岩特征一致。花岗斑岩中锆石的LA-ICP-MS U-Pb测年结果表明其成岩年龄为（123.0±1.6）Ma,为早白垩世。锆石Hf同位素分析表明,ε_Hf（t）值均为负值,介于-15.72~-12.85之间,平均值为-14.14,二阶段模式年龄（T_DM2）在2 164~1 989 Ma之间,平均为2 067 Ma,反映源岩以大陆壳成分为主。结合花岗斑岩高SiO₂,低Mg、Co、Cr、Ni,且富集LREE和LILE,亏损HFSE等特征,表明早白垩世花岗斑岩岩浆应为大陆地壳物质熔融的产物。根据年代学和岩石地球化学研究认为,早白垩世花岗斑岩是古太平洋板块向欧亚大陆板块俯冲所形成的活动大陆边缘弧花岗岩。研究区早白垩世花岗斑岩的形成主要受太平洋构造域的影响,形成环境受板块俯冲造山后伸展作用和下地壳拆沉作用的联合制约,是辽东地区岩石圈减薄的直接证据。     

TECTONIC FEATURES AND HYDROCARBON POTENTIAL OF THE EASTERN QAIDAM BASIN

TECTONIC FEATURES AND HYDROCARBON POTENTIAL OF THE EASTERN QAIDAM BASIN     

Influence of the Kunlun Mountain Ms8.1 Earthquake on Horizontal Crustal Deformation in the Sichuan and Yunnan Area

In order to track the space-time variation of regional strain field holistically(in a large scale) and to describe the regional movement field more objectively,the paper uses a nonlinear continuous strain model focused on extracting medium-low frequency strain information on the basis of a region with no rotation.According to the repeated measurements(1999～2001～2004) from GPS monitoring stations in the Sichuan and Yunnan area obtained by the Project of "China Crust Movement Measuring Network",and with the movement of 1999～2001(stage deformation background) as the basic reference,we separated the main influencing factors of the Kunlun Mountain M-S8.1 earthquake in 2001 from the data of 2001 and 2004,and the results indicate:(1) the Kunlun Mountain M-S8.1 earthquake has a discriminating effect on the Sichuan and Yunnan area,moreover,the deformation mode and background had not only certain similitude but also some diversity;(2) The movement field before the earthquake was very ordinal,while after the earthquake,order and disorder existed simultaneously in the displacement field;The displacement quantities of GPS monitoring stations were generally several millimeters;(3) The principal strain field before earthquake was basically tensile in an approximate EW direction and compressive in the SN direction,and tension was predominant.After the earthquake,the principal strain field in the Sichuan area was compressive in the EW direction and tensile in the SN direction,and the compression was predominant.In the Yunnan area,it was tensional in the NE direction and compressive in the NW direction,and tension was predominant;(4) The surficial strain before the earthquake was dominated by superficial expansion,the contractive area being located basically in the east boundary of Sichuan and Yunnan block and its neighborhood.After the earthquake,the Sichuan area was surface contractive(the further north,the greater it was),and south of it was an area of superficial expansion.Generally speaking,the Kunlun Mountain M-S8.1 earthquake played an active role in the accumulation of energy in the Sichuan and Yunnan area.Special attention shall be focused on the segment of Xichang-Dongchuan and its neighborhood.     

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南宁市大气电场雷电预警系统的原理及应用

介绍南宁市大气电场雷电预警系统的原理及运行机制,通过一次成功的雷电预警过程,验证了系统的可用性,同时对系统的使用提出一些建议。     

长江三峡狮子口重力滑动构造

围绕着长江三峡库处区狮子口ＮＮＷ向线性影像带的构造性及其地壳稳定性评价问题进行了专题研究，以区域地质调查为基础，运用构造解析方法，采用多学科，多手段的综合研究，确认该影像带影像特征最明显的地段乃是一个滑褶型多层式得力滑动构造，本文还分析了该系统形成的介质条件，斜坡构造及动力环境。     

产酯酶海洋中度嗜盐菌Halomonas sp.LYG1-1的分离鉴定及其酶学性质

以从海南三亚近海海水中采集的样品为研究对象,利用平板筛选法筛到一株产酯酶的中度嗜盐菌菌株LYG1-1。通过形态学、生理生化及16S rRNA序列分析,发现该菌株为革兰氏阴性菌,其最适生长温度为30℃,最适生长pH为7.5,最适NaCl浓度为10%。16S rRNA基因序列分析显示,菌株LYG1-1与Halomonas salina亲缘性最近,16S rRNA基因序列相似性为99.72%。在含10%NaCl的0.05mol·L-1Tris-HCl(pH 8.0)缓冲液中,45℃条件下作用,酶活性最高,40℃处理24h仍保持83%的活性。金属离子浓度为5mmol·L-1时,Ca2+、Mg2+对菌株LYG1-1酶活具有明显的激活作用,Hg2+表现出强烈的抑制作用。