New Cretaceous palaeointensity data and the constraints on geodynamics

A combined geochronologic (K-Ar) and palaeomagnetic study has been conducted on a basalt lava sequence at Yixian Formation in Liaoning Province, northeastern China. The new K-Ar age obtained from thirteen lava flows is 120.93±0.88 Ma. Detailed rock-magnetic investigations were conducted on each lava flow to determine their remanence carriers. The modified version of the Thellier-Thellier palaeointensity method with systematic partial thermoremanent magnetization (pTRM) checks was used for the palaeointensity determination. Virtual dipole moment (VDM) value is (3.66±0.10)x10²² Am². This low dipole-field intensity value is approximately forty-five percent of the today field VDM. Combined with all of the other published palaeointensity data, possible links between the earth’s interior process and its control on the variation of the earth’s magnetic field during the geological time were tentatively discussed.     

青藏高原东部积雪日数特征的分析

本文利用青藏高原曲麻来、托托河和玉树三站的32年逐日积雪实测资料,进行了统计分析,得出了它们的时间变化特征,并对Elnino现象的发生作了简单的联系。     

聊古—井水氡正常动态的探讨

采用相关距平法和增均值法对聊古－井１２年的水氡预测资料进行了处理和分析。从定性、定量两方面描述了聊古－井水氡预测资料的正常年动态呈近直线型。并且从本井水文地球化学背景、阐述了分析、判断水氡测值异常的机理,为本区或邻区地震的预测预报,提供了依据。     

Geochemical significance of hydrocarbons desorbed from asphaltenes

Saturate hydrocarbon fractions desorbed (cleaned) from asphaltenes extracted and separated from two core samples (a tar sand and a reservoir sandstone sample) were analyzed by gas chromatography-mass spectrometry (GC-MS). The results indicated thatn-alkanes adsorbed in asphaltenes were kept quite well during and after severe biodegradation over 360 Ma. Hydrocarbon desorption could be an alternative method of, or even better than the pyrolysis of asphaltenes to reconstruct the hydrocarbon fingerprints of primary oils and extend the understanding of the origins of hydrocarbon reservoirs. Project supported by the Chinese Academy of Sciences, State Key Laboratory of Organic Geochemistry and Research Center of Tarim Petroleum Exploration and Development.     

冷凝法测环境氡

本文综 大气氡测量的现状,介绍了冷凝法测氡的工作原理,方法及其优缺点,论述了该方法所采用仪器的结构性能,讨论了测量结果,并指出了今后进一步工作的方向。     

粗粒土动强度试验成果的分析方法

介绍一种新的粗粒土动强度试验成果的分析整理方法。在对试验所获资料进行误差分析的基础上,认为这种方法可为工程设计的可靠性分析提供方便和依据,同时,也有效地弱化资料分析整理过程中的人为因素。     

福鼎市新世纪大厦工程地质研究及基础形式的选用

福鼎新世纪大厦为23层高层建筑,作者通过对其场地岩土工程地质研究、分析,科学地提出采用箱型基础,并得到了施工验证和土建设计部门认可;从而既解决了实际施工难题,又节省了大量财力、物力,同时打破了以往高层建筑宜采用桩基础传统理论。     

MZ-150型锚杆钻机变角机构的力学分析

锚杆钻机是基础工程施工中的一种十分重要的钻孔设备。其变角机构关系到钻机的整体性能。对ＭＺ－１５０型锚杆钻机的变角机构进行了运动学和力学分析,提出了合理的设计参数,为钻机设计提供了理论依据。     

贯通式潜孔锤气力喷反钻具系统

介绍了贯通式潜孔锤气力喷反钻具系统的工作原理、结构设计、钻具特点及测试和生产试验情况。     

区域国土资源分等评价研究：以大连陆域国土资源为例

区域国土资源分等评价是价格评估的前期工作。文中以大连陆域国土资源分等评价为例，讨论了区域国土资源等级评定方法。