树木年轮资料的可靠性分析——以陕西华山松为例

依据陕西华山的华山松树木年轮宽度、最大密度与最小密度年表，以及对树木生长模拟结果，本文分析了树木径向生长对气候因子（气温和降水）的响应状况。结果表明树木年轮生长的多种指标均能相互印证，并具有生理学意义，从而证实了它们作为气候变化的代用资料是可靠的。这不仅强调了树木年轮多途径分析的必要性，而且为重建过去气候变化提供了依据。     

The Chahe Copper Deposit—Its Age and Genesis

The Chahe copper deposit occurs in the Early Proterozoic metamorphic series in the area of Chahe and its chalcopyrite yielded a Pb−Pb isochron age of 951±36 Ma, providing evidence for copper mineralization at the early stage of the Jinning movement. The ore-forming material came from terrestrial clastic sediments and marine volcanic eruption and the ores were deposited in a relatively open beach environment. The Jinning movement led to folding and metamorphism of country strata, as well as to the rebomilization and transport of copper, resulting in ore deposition in structurally weak locations. This deposit is a volcano-sedimentary metamorphic deposit.     

论吉林省韧性剪切带地质特征及分布规律

韧性剪切带是地壳较深层次的变形产物，具有特殊的构造特征，吉林省韧性剪切带主要分布于前寒纪和古生代变质岩系中，本文论述了吉林省韧性剪切带的地质特征及分布规律，讨论了韧性剪切带对金，多金属矿床的控制作用。     

The separation and parameter determination of PS converted phases in deep sounding by converted waves of earthquakes

The practice of deep sounding by converted waves of Earthquakes shows that the time duration of the PS converted phases is usually longer than the arrival time delay between the converted phases coming from the adjacent boundaries. So, the mutual interference of the converted phases from adjacent boundaries may form a complicated interference series of the waves. It is difficult to recognize and determine exactly the parameters of the converted waves in the interfering records. In this paper the method of omni-azimuthal polarization analysis and the method of separation of interfering waves are described. The theoretical examples show that the procedure given in the paper is rather effective to separate the interfering waves and to determine their parameters, and so, is important to improve the resolving power and the reliability of the method of deep sounding by converted waves of earthquakes. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 39–45, 1993. The research reported here is a part of proposal sponsored by State Seismological Bureau and China Joint Seismological Science Foundation.     

南方膨胀土的微结构特性与工程性质研究

本文对南方膨胀土的微结构特性进行了实验研究,表明膨胀土具有其特殊的微结构特性,其决定着膨胀土的膨胀势。而膨胀土的膨胀性能决定于微结构特性——水体系(内因)与外界环境因素的有机组合。     

泡沫塑料分离富集原子吸收法测定氰化液中金和银

研究了装有聚醚型泡沫塑料和三苯基膦负载聚醚型泡沫塑料的吸附柱对Au,Ag的分离富集的条件,并应用于氰化液、解吸液和电解液中Au和Ag测定中的预富集,Au和Ag的回收率均>98％。对含Au量为0.91μg/ml,含Ag量0.36μg/ml的试样,经过10次测定,其相对标准偏差分别为1.22％和2.31％。     

上部岩石圈应力状态的三维有限元模拟

本文较详细地介绍了上部岩石圈应力状态的三维有限元模拟的方法及得到的垂直应力特征。假设在地质时间尺度上,上部岩石圈0～40公里范围内(简称地壳)以线弹性变形为主。考虑到地壳三维不均一性对地壳应力场的影响,将地壳沿水平方向分成七种地质构造单元:大洋、大陆、高原、洋中脊、海沟、转换断层和三联点,沿径向方向分成二层,以重力(包括引力和离心惯性力)和温度变化作为载荷,采用三维有限单元法计算了地壳的应力场。计算结果表明:(1)地壳垂直应力以压应力占绝对优势,张应力只发生在洋中脊等异常带及其它特定地区,(2)在同一深度上,垂直应力随纬度的增大而线性增加,(3)在深25公里范围内,垂直应力随着深度的增加而增大,其值与海姆法则预测值吻合;(4)异常高的垂直应力梯度往往发生在异常带(板块边界)邻近地区。     

陕西周至及邻区地震活动分析

分析了陕西周至及附近的地震活动及有感地震的等震线特征，认为该区以孤立型小震或小震群活动为主，在较大范围内，地壳应力还是处于调整状态，近期发生中强以上地震的可能性不大。     

OBSERVATION AND INVESTIGATION OF VARIABILITIES OF BASELINE CO_2 CONCENTRATION OVER WALIGUAN MOUNTAIN IN QINGHAI PROVINCE OF CHINA

In-situ measurement of atmospheric CO_2 was made at the top of the Waliguan Mountain(36°17′N,100°54′E,3816m asl).where the air is not directly affected by the local anthropogenic and natural sources,by using a nondispersiveinfrared(NDIR)analyzer and following the procedures proposed by WMO.The CO_2 in the flask samples collected onthe mountain was also analyzed in a laboratory.The measurements uncover the daily,monthly and seasonal variabilitiesand the baseline level of the CO_2 in the air over the“clean”area of Chinese hinterland.Results suggest that theCO_2 concentration over the East Asia continent has evident periodical variation,similar to that of global distribution.In1992,an annual mean baseline CO_2 concentration of 356.4 ppm over the continent was obtained.The annual mean val-ue was 357.2 ppm for 1993.Some relationships between the CO_2 concentration at Waliguan and the weather conditions,especially,wind speed and direction are found through the observation.     

塔克拉玛干沙漠腹地晚冰期以来的环境与气候变化

通过对塔克拉玛干沙漠腹地地层剖面的沉积类型、孢粉、ｐＨ值、有机质、ＣａＣＯ＿３和地球化学气候指标Ｃ等分析，认为本区晚冰期以来一直处于荒漠环境，气候变化可划出四个阶段：１３－１０ｋａＢ．Ｐ．气候寒冷。温凉，干旱，湿度相对后期较大；１０－８ｋａＢ．Ｐ．气候温暖干旱，湿度相对减小；８－３ｋａＢ．Ｐ．气候炎热干旱，湿度最小；３ｋａＢ．Ｐ．至今气候温暖干旱，湿度较前增大，气候及环境与今相似。