地磁Z分量日变幅度相关分析与唐山7.8级地震

本文给出了唐山地震前后昌黎台、宝抵台和北京台相对红山台地磁场垂直分量Z日变幅相关分析的结果。结果表明震前三台均有异常显示,昌黎台最为明显,异常时间为数月,异常幅度为数伽马。综合文献[1,2]及本文结果,简单讨论了这类变化的可能机制,提出包体破裂失稳—孔隙流体扩散—包体膨胀硬化过程可能是引起这种变化的原因。     

A study of water balance in china

The water balance in C'hina is studied in this paper, which follows the papers on the radiation balance and the heat balance in China. Using the data from more than 200 meteorological stations for 1961-1970 and about 200 hydrometric stations bcforc1972, we, through the equation of water balance, have calculated the monthly and annual amounts of precipitation, evaporation, run-off and soil water variation. The water balance and the hydroclimatological characteristics of China arc given.     

太阳辐射日变化对气候模拟的影响

本文用两层大气环流模式,作气候模拟对于太阳辐射日变化的敏感性试验.取实测的七月纬圈平均气候资料作为初始场,积分四十天,对后三十天的结果进行平均,作为模拟的月平均状态.另一个试验则是在模式中去掉太阳辐射的日变化,其它都和第一个试验相同。比较这两个试验的计算结果,发现:若忽略太阳辐射的日变化,(i)使纬圈平均降水和蒸发都减少,尤其在中纬陆地上更为显著;(ii)部分地区土壤湿度减少;(iii)云量增加;(iv)大气顶净辐射收入明显减少;(v)地表净加热明显减少;并使土壤湿度变化不大的地区地表温度明显降低. 我们还取了一月纬圈平均气候资料作为初始场,作了同样的数值试验。得到了类似的结果. 本文的结果表明,要作出正确的气候预测,以及作中、短期降水预报,考虑太阳辐射的日变化都是必要的.     

山东角07井注(漏)水诱发地震——地表宏观现象与震群活动特点

本文介绍了1985年底发生在山东胜利油田角07井的一次注水诱发型小震群的活动情况,论述了地表宏观现象,分析与讨论了这次诱发型震群的活动特点     

天水地电台干扰原因的初步分析

1.前言天水地电台已有15年观测历史,但由于一直存在着较严重的干扰现象,直接影响了资料质量和预报效果。为了克服和排除这些干扰,我们用不同极距进行了对比实验观测,取得了较好的效果,据此提出了该台的改造方案,並已正式投入使用。     

民乐盆地某些活断层断层泥中石英颗粒的表面特征及其地震地质意义

本文对民乐盆地三条活动断层断层泥内石英颗粒表面的显微构造作了较系统的研究。根据这些石英颗粒表面特征对该区莺落峡等断层的滑动性质和断层活动的相对年代进行了讨论。提出了以下的新看法:莺落峡断层的中段为粘滑段,东西两段为蠕滑段,古震源在该断层的黑河口一带,发生的时代大致在晚更新世晚期或全新世早期;茨湖断层具有最新活动特征,粘滑标志明显。另外清水沟老断层在全新世时也有新活动。     

Geological and fluid inclusion studies of the Dongpo tungsten skarn ore deposit,China

The Dongpo tungsten ore deposit, the largest scheelite skarn deposit in China, is located at the contact of a 172-m. y. biotite granite with a Devonian marble. The mineralization associated with the granite includes W, Bi-Mo, Cu-Sn and Pb-Zn ores. Several W mineralization stages are shown by the occurrence of ore in massive skarn deposits and in later cross-cutting veins. The high garnet/pyroxene ratio, the hedenbergite and diopside-rich pyroxene and the andradite-rich garnet show the deposit belongs to the oxidized skarn type. Detailed fluid inclusion studies of granite, greisen, skarn and vein samples reveal three types of fluid inclusion: (1) liquid-rich, (2) gas-rich and (3) inclusions with several daughter minerals. Type (3) is by far the most common in both skarn and vein samples. The dominant daughter mineral in fluid inclusions is rhembic, highly birefringent, and does not dissolve on heating even at 530°C. We assume that this mineral is calcite. The liquid phase in most of the fluid inclusions has low to moderate salinities: 0–15 wt. %; in a few has higher salinities (30–40 wt. % NaCl equivalent). The homogenization temperatures of inclusions in the skarn stage range from 350°C to 530°C, later tungsten mineralization-stage inclusions homogenize between 200°C and 300°C, as do inclusions in veins. Fluid inclusions in granite and greisen resemble those of the late tungsten mineralization stage, with low salinity and homogenization temperatures of 200°–360°C. The tungsten-forming fluids are probably a mixture that came from biotite granite and the surrounding country rocks.     

论弱活动断裂在岩溶区航片水文地质判译中的作用

<正> 在水文地质工程地质领域中,活动断裂以其对地下水的运移、富集及人类工程活动等方面的深刻影响而受到人们的重视。七十年代以来,随着我国地震工作的深入开展,区域水文地质工程地质普查的广泛进行,以及若干新的探测技术方法的引进,人们对活动断裂的区域分布规律、地质地貌特征及其水文地质工程地质意义等方面的认识日益深入。     

平面滑动标准化法在区域水化资料整理中的应用

平面滑动标准化法是应用电子计算机处理(以下简体电算)大量区域水化资料的一种方法。它能够较好地反映水中各种元素的区域分布和圈定高背景区,准确地确定各类水异常的规模、强度和空间展布,有效地检出大量数据中的微弱信息,比传统整理方法具有显著的优越性。本文以65地区的应用效果加以说明。     

TL dating of malan loess in gansu province

TL dating technique is of great advantage for determining the initial time of storing energy (T₀) in an object to be analyzed. The sample is required to have undergone at least one thermal event, permitting all the residual storage to release. As a result, TL dating technique has found wide application in geochronology of pottery. The determination of T₀ of loess is mainly based on the fact that fine particles of which loess is composed will lose their storage in the process of transportation by wind. In our experiment TL dating technique was adopted to determine the ages of fine quartz grains, and the results were corrected for those of shine-fading experiment. TL dating of Malan loess specimens from Mt. Gaolanshan, Liugouhe near Lanzhou, Mt. Qijiadashan in Jingning and Baichaoyuan in Huining gave the age values of 2.6±0.1, 3.6±0,3. 4.7±0.5 and 10.0±0.6×10⁴ yr, respectively. The values indicate that the Malan loess began depositing in Late Pleisotocene, but the initial time and acumulation rate are different under different morphological conditions from place to place.