福建湄州岛镁铁质岩墙群与寄主花岗岩的形成时差、地球化学及成因

福建湄洲岛的镁铁质岩墙群侵入于花岗岩中.镁铁质岩墙主要由斜长石(An=45～55.中-拉长石)、普通角闪石及少量辉石和石英等组成,锆石SHRIMP U-Pb年龄为(95±2)Ma.寄主花岗岩主要由石英、钾长石、斜长石(An=22～25,更长石)及少量的黑云母组成.锆石SHRIMP U-Pb年龄为(105±3)Ma.它们的形成时差约10 Ma.在岩石地球化学上,镁铁质岩墙群具有低CaO、MgO、TiO2而高Al2O3、轻稀土元素和大离子亲石元素富集、高场强元素亏损等特点.(87Sr/86Sr)i=0.705 2～0.705 4,εNd(t)=-0.03～1.57.与福建沿海同时代镁铁质岩墙群相似.寄主花岗岩与沿海高钾钙碱性花岗岩基本相同.都具有高硅、富碱的特点,它们的w(SiO2)>75%,A/CNK=1.05～1.12,w(K2O+Na2O)=7.68%～8.12%,w(K2O)>w(Na2O),(87Sr/86St)i=0.705 5,εNd(t)=-3.92.综合研究表明:湄洲岛寄主花岗岩是由受消减作用影响的岩石圈地幔部分熔融而产生的玄武岩浆底侵,并熔融中下地壳所产生的花岗岩浆形成;而镁铁质岩墙是底侵、滞留并经过结晶分异的玄武质岩浆,因地壳再次伸展,而沿花岗岩体中节理侵入形成.湄洲岛花岗岩与镁铁质岩墙群形成于伸展构造环境.对应福建沿海2次地壳伸展事件.湄洲岛花岗岩和镁铁质岩墙群的研究为沿海晚中生代构造一岩浆活动提供了一个新例证,同时为福建沿海晚中生代岩石圈伸展时限提供了制约.     

大兴安岭北部碧州地区满克头鄂博组流纹岩地球化学特征研究

对大兴安岭北部碧州地区满克头鄂博组流纹岩进行了详细的地球化学特征研究。地球化学特征表明该期流纹岩属于高钾富碱钙碱性过铝质岩石,球粒陨石标准化稀土配分曲线呈轻稀土富集的右倾特征,原始地幔标准化图解显示大离子亲石元素Rb、K、Sr、Ba的富集及高场强元素Nb、Ta、P的强烈亏损,(La/Sm)N、(Sr/Ba)N变化幅度弱,综合反映其岩浆源区为过渡型地幔。流纹岩由过渡型地幔岩石减压熔融形成玄武质岩浆,上升到下地壳岩浆房中经结晶分异作用形成,同时也有一定程度的下地壳物质混染。根据区域对比并结合前人研究成果,认为满克头鄂博组流纹岩形成于火山弧挤压环境,可能与蒙古-鄂霍茨克洋的闭合密切相关。     

下庄铀矿田微量元素和稀土元素地球化学特征

下庄铀矿田是我国最大的花岗岩型铀矿田,本文在详细的野外勘察基础上,对矿田下庄岩体、帽峰岩体以及不同矿化类型(硅化碎裂岩型、蚀变碎裂花岗岩型和碱交代型)矿石的微量元素和稀土元素进行系统分析。结果表明,下庄岩体和帽峰岩体富集大离子亲石元素Rb和稀土元素Ce、Sm、Y,明显亏损Ba、Sr和轻微亏损Nb、Ta,具有较高的Rb/Sr比值和较低的Nb/Ta比值,表明下庄岩体和帽峰岩体高度成熟的地壳演化特征。硅化碎裂岩型和碎裂蚀变花岗岩型矿石Zr亏损明显,反映矿石形成过程中有地壳物质混染;各类型矿石稀土总量ΣREE、Sm-Nd图解、轻-中-重稀土元素三角图解反映出成矿流体运移过程中萃取了不同岩石中的稀土元素,矿石稀土元素主要继承了围岩中稀土元素特征,铀矿田成矿过程处于一个连续的热液体系中。     

南秦岭白马山岩体Sr、Nd、Pb同位素组成及源区示踪

研究了南秦岭晚三叠世(~200 Ma)7个花岗岩类岩体的Sr、Nd、Pb同位素组成,包括白马山岩体在内的南秦岭花岗岩类以低放射成因Pb同位素组成为特征,初始87Sr/86Sr比值范围为0.70495~0.70908,εNd(t)值变化于-2.40~-8.55之间,Nd同位素模式年龄(TDM)变化于1.2~1.7 Ga之间,从东部到西部,呈现εNd(t)逐渐降低而TDM逐渐增高的变化规律。白马山岩体的初始87Sr/86Sr比值为0.70637,εNd(t)=-6.75,具有较高的TDM值(1.53 Ga),暗示其岩浆源区主要来自于南秦岭的大陆下地壳,岩浆源区以类似南秦岭耀岭河群基性火山岩为主,南秦岭较古老的地壳物质仅有少量参与。基性下地壳增厚,岩石圈地幔拆沉,软流圈上涌,下地壳部分熔融形成有利于铜、金成矿的白马山"C"型埃达克岩。     

东昆仑那更晚三叠世流纹岩地球化学特征、成因及构造环境

岩石地球化学分析显示,那更流纹岩SiO_2含量为70.69%～73.21%,全碱(Na_2O+K_2O)含量7.54%～8.38%,且Na_2OK_2O,Al_2O_3=11.94%～13.11%,A/ANK1.1,岩石属于高钾钙碱性准铝质系列;岩石轻、重稀土元素存在一定的分馏,负铕异常明显(δEu=0.19～0.34),相对富集Rb、Ba、Th、U等元素,亏损Sr、Ta、Nb等元素。其与伸展构造背景下地壳物质部分熔融的产物特征一致。~(206)Pb/~(204)Pb=18.182～18.191,~(207)Pb/~(204)Pb=15.572～15.585,~(208)Pb/~(204)Pb=38.451～38.512,表明岩浆来源于下地壳,为地壳下部岩浆经历了早期结晶分异作用的产物。     

电感耦合等离子体质谱法测定金属矿中稀土和稀散元素

金属矿中稀土和稀散元素的测定对其综合利用具有重要意义。难溶元素Nb、Ta、Zr、Hf采用酸溶法处理时较难溶解完全,Nb、Ta采用碱熔法处理后再用王水浸取存在不稳定的问题。实验采用偏硼酸锂熔融样品,酒石酸体系浸取,解决了上述Nb、Ta等元素测定中遇到的难题。通过选择待测同位素和干扰校正方法在线校正,以10 μg/L¹⁸⁵Re和10 μg/L¹⁰³Rh为混合内标,采用电感耦合等离子体质谱法(ICP-MS)对浸取液进行测定,实现了对金属矿中La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Y共15种稀土元素,及Nb、Ta、Zr、Hf、Ga、Rb、Cd、Cs、In、Tl共10种稀散元素的测定。方法校准曲线的线性相关系数均大于0.999 7,方法检出限为0.03～0.85 μg/g,定量限为0.09～2.55 μg/g。将实验方法应用于铅矿石、钨矿石、钽矿石和锆矿石标准物质中稀土和稀散元素的测定,结果的相对误差(RE)为-5.33%～6.67%,相对标准偏差(RSD,n=12)不大于9.8%。采用实验方法对洛宁铅锌多金属矿区的样品进行测定,结果的相对标准偏差(n=5)不大于9.3%。     

湘东北黄金洞金矿床微量元素、稀土元素特征及其地质意义

黄金洞金矿床是位于江南古陆造山带中段的大型金矿床,具有金矿资源储量大、品位高、共伴生元素多等特点。矿石微量元素和稀土元素分析结果显示:微量元素具有Li、Co、Cu、Rb、Cs、Tl、Th富集,而Cr、Ni、Sr、Cd、Ta、U、Zr亏损,大离子亲石元素Rb富集,Sr亏损,高场强元素Th富集,Nb亏损;稀土元素具有轻稀土富集,重稀土亏损,球粒陨石标准化配分曲线均为右倾型式的特征。由此表明,黄金洞金矿床成矿物质具有多来源性,应为壳幔混合来源。     

中天山卡瓦布拉克杂岩带中酸性岩的地质特征及其构造意义

研究中天山地块卡瓦布拉克杂岩带中酸性岩的地质特征及其构造意义,在查明中-基性岩主体岩石花岗岩的岩石学特征的基础上,分析了该岩石的主、微量元素组成。结果显示:该岩石属于钙碱性系列,富集轻稀土元素(LREE)和大离子亲石元素(Rb、U、Th),明显亏损重稀土元素(HREE)和高场强元素(Nb、Ta),表现出岛弧岩石的特征且源于亏损地幔,洋壳俯冲作用过程中地壳物质增生的重要组成的部分。     

赣南九龙脑岩体及洪水寨云英岩型钨矿年代学

通过赣南大余县九龙脑岩体及与之有密切成因关系的洪水寨云英岩型钨矿野外地质调查和系统的岩石化学、微量元素、稀土元素和成岩成矿时代研究,结合区域成岩成矿时代的最新研究成果,探讨了赣南地区钨矿的成岩成矿时代及构造环境.结果表明:九龙脑花岗岩体在化学成分上具有高Si、富碱、准铝质到弱过铝质、贫Ca、贫Mg、铁镁比值大、K2O/Na2O＞1的特征;微量元素以富含Rb、K,亏损Ba、Sr等大离子亲石元素(LILE)和富含Th、U、Ce、Y、Sm、Nd、Ta、Hf,亏损Nb、P等高场强元素(HFSE)为主要特征,具强烈的Eu负异常(δEu=0.07～0.10)和较高的10 000Ga/Al特征比值(2.76～2.93),所有这些均显示铝质A型花岗岩的特征.利用锆石SHRIMP U-Pb法,获得九龙脑岩体的成岩年龄为(155.8±1.2)Ma(n=12,MSWD=0.6);利用辉钼矿Re-Os法,获得洪水寨云英岩型钨矿的成矿年龄为(156.3±1.3)Ma(n=7,MSWD=1.5),成岩成矿年龄基本一致.结合崇(义)-(大)余-(上)犹钨锡矿集区已有的年代学资料,指出本区的成岩成矿年龄主要集中在150～160 Ma,属于华南中生代第二次大规模成矿作用,形成于中生代岩石圈伸展时期的侏罗纪板内拉张环境的地球动力学背景.     

内蒙古阿拉善右旗塔木素地区三叠纪正长花岗岩成因及构造环境分析

塔木素地区三叠纪正长花岗岩岩石化学特征显示其总体呈富硅、碱,高FeOT/MgO比值和10 000×Ga/Al值,贫钙、镁的特征,属准铝质-弱过铝质、高钾钙碱性系列-钾玄岩系列;轻重稀土分馏明显,Eu负异常明显,稀土曲线右倾,属轻稀土富集型;微量元素表现出Zr、Hf、K元素相对富集,而Rb、Sr、Nb、Ta、U、Ti、Cr、Co、Ni元素亏损;同时具有较高的Y/Nb和Rb/Nb值,显示A2型花岗岩的特征。结合相关花岗岩构造图解分析,塔木素三叠纪正长花岗岩为在大陆边缘正常岩浆弧上,由地壳重熔而形成的增生于大陆边缘上的花岗岩,岩浆来源应为壳幔混合。其作为新生地壳的一部分,代表了碰撞晚期或碰撞后地壳增厚、抬升、拉张的构造环境。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.