天山冰川与湖泊变化所示的气候趋势

天山山系深居亚洲大陆腹地，受中亚自然地理环境的制约，在变性西风气流的影响下，７０年代至今山地冰物质平衡负值，伴随着气温的变化而增大。湖泊则是随着山区降水量的增加，其面积渐增。气温与降水的相互作用，使得整修天山山系的水资源总量趋于正常略偏多。预期这种气候趋势将会延续到下世纪初期。     

吉林放牛沟硫铁多金属矿床成矿成晕物质来源

区域地层岩石中元素丰度及其演化资料说明,早古生代末期的火山作用与放牛沟多金属矿床的形成并无明显的直接联系。从时空关系、物质组分以及矿化和元素在多种介质中的分带规律都表明矿床、原生晕和华力西早期后庙岭花岗岩具有共同的物质来源。矿床同位素研究结果,成矿成晕物质主要来自上地幔或下地壳,但有部分来自上地壳。后庙岭花岗岩以Ⅰ型为主,并兼有S型特征。其成岩物质主要来自深部地壳同熔岩浆,但也有部分火山-沉积岩系同化重熔物质加入。根据初始~(87)Sr/~(86)Sr比值为0.705成岩物质也应以深源为主。后庙岭花岗岩物质来源的双重性一定程度上反映了放牛沟多金属矿床成矿成晕物质来源的双重性——以下地壳为主并兼有上地壳物质来源。     

海州湾南岸全新世海面波动及其影响范围

海州湾位于南黄海西部,我国自然地理南北分界的东端,海州湾沿岸属于我国东部沿海海岸南北之间重要过渡地段。对该区全新世海面波动研究显得极为重要,本文分别依据海州湾南岸的徐圩孔和孔望山孔两个钻孔全新世地层的岩心,对其作了微古样品定量分析。结合海州湾南岸古文化遗址、海侵遗迹的调查与分析,探讨了海州湾南岸全新世海面波动规律,力图使钻孔中获得的纵向海     

沐川矿——一种新的含水的钼硫化物

Muchuanite, a new water-bearing molybdenum sulphide mineral, was discovered in aseries of molybdenum-bearing feldspathic quartz-sandstone of the Jurassic system,Sichuan Province, China. Muchuanite is darkly powdery and very finely sealy with specific gravity=5.01(meas.) and 5.10(ealc.),and microhardness=16-35 kg/mm^3.Optically,it is nniaxial(-),Refrative index in sir Rs=26.6-29.5%,Rp=12.3-14.2%,colour index X=0.3114,Y=0.37848,λd=566mμ,Pe=14.4%.The chemical composition of muchuanite is given as follows;Mo 52.88,54.20;S 37.34 36.00;Fe n.d.,2.2;Si n.d.,0.5; H2O^ 6.03,5.95;H2O^- 2.07,.00;total 98.59,99.85.Chemical and electron microprobe analyses gave the following formuls;MoS2,0.5H2O.Muchuanite is trigonal with space group C3^1=P3ml,unitcell parameters α=3.16A,c=43.60A,v=377.09A,z=7,and unit-cell containing 3.5 water molecules.The strongest lines given by X-ray diffraction pattern(d,A,intensity hkl)are 6.013(10,0.0.7);2.677(8.0.0.16);2.257(7,0.0.19);1.567(7,1.1.3);1.523(7,0.0.28);1.096(3,1.1.28);1.021(3,0.0.42).Muchuanite is syngenetic with feldspathic quartz sandstone.The mineral is named after the locality where it was discovered,i.e.Muchuan County in Sichuan Province.     

国际地震区内土砖建筑学术讨论会概况

伊朗巴列维大学雷扎尼(Raza Razani)教授在讲述自己的研究项目时做了这样的推测,“在造价为300万美元的电控振动台上修建造价只有100美元的土砖房,想想这点你一定会感到相当可笑。”这两笔钱使用得不相称,科学文明程度也不匹配,它们在会议期间反应出的种种观点中具有代表性。无论是从会议的特点来看还是从会议所讨论课题来看这样的不相称情况都是十分明显的。因为这些课题是由各     

The concentration variation features of sea salt ions and non sea salt ions in a firn core recovered from Princess Elizabeth Land, East Antarctica

A 51.85 m firn core drilled in Princess Elizabeth Land, Antarctica, during the 1996-1997 Chinese First Antarctic Inland Expedition, has been measured for δ 18 O and major ions. Based on the high quality data of the seasonal variations of major ions, the firn core was dated with errors within ±3 years. The 51.85 m firn core record extends for 251 years (A. D. 1745-1996). The results of the glaciochemistry data of the firn core show that the mean concentrations of Cl -, Na + and Mg 2+ are similar to those reported from other coastal areas in East Antarctica. However, mean concentrations of Ca 2+ are much higher than those reported from other regions, this anomaly phenomenon may be related to the strong local terrestrial sources. It is found that the variations of three kinds of sea salt ions (Cl -, Na + and Mg 2+ ) in the past 150 years show very similarly rising trends, which may be the results the Southern Hemisphere warming in the past century.     

中西部地区建立现代地籍涉及的几个问题

“十分珍惜，合理利用土地和切实保护耕地”是国家的一项基本国策。随着工业化和城市化进程的加快，形成了对土地的巨大需求。但落后的管理方法，陈旧的档案资料，加上管理不严，上地乱占滥用现象严重，致使耕地锐减。在完善土地立法，加强土地执法力度的同时，依托现代高科技手段(3S、IT和网络技术)，建立现代多用途地籍成为土地资源信息系统建设，实现信息技术服务社会的重中之重。