东秦岭北缘煤的变质作用与板块构造的关系   总被引：2，自引：1，他引：2  

何建坤 《地质论评》1996,42(1):7-13

以河南省东秦岭造山带北缘山西组二１煤层的煤岩、煤质、煤有机地球化学和“晶核”结构的综合研究为前提，结合板块构造和地球物理场的研究分析，认为该区二１煤的变质热源主要与长期复杂的板块俯冲、Ａ型碰撞所引起的地壳结构调整而使前陆盆地区岩石圈结构变化，大地热流急增的结果有关。二１煤的变质主要经历了早期（印支期前）的区域深成变质（达肥－气煤）和后期（印支－燕山期）的典型异常热变质作用（达无烟煤－高阶无烟煤）。  相似文献   

华北地台南缘中元古代官道口群热水沉积硅质岩的地球化学特征   总被引：5，自引：0，他引：5       下载免费PDF全文

魏俊浩  王思源  吕国芳  潘振祥  马旭东 《地球科学》1996,(1)

在简要介绍了硅质岩基本地质特征的基础上，详细讨论了该套硅质岩的常量元素、微量元素以及氧同位素化学成分及组成．研究表明，该套硅质岩富集了与热水成因有关的Ａｇ、Ａｓ、Ｃｒ、Ｐｂ、Ｚｎ、Ｃｕ、Ｂ、Ｓｂ等微量元素和ＣａＯ、ＦｅＯ、Ｆｅ２Ｏ３等氧化物中常量元素，贫化了ＴｉＯ２、Ａｌ２Ｏ３、ＭｎＯ等氧化物中的常量元素．氧同位素组成及利用氧同位素估算的硅质岩的形成温度，均反映了热水沉积成因的特点  相似文献   

华南-古岩溶型铀矿床中有机质的热成熟异常及其矿床成因意义     

闽茂中  张祖还  刘兰忠 《矿床地质》1996,15(1):64-70

华南某层控铀矿床中有机质可分为原生沉积型、热液变质型和运移型三种类型，其母质类型为腐泥－腐殖型，主要来源于海相微体生物、藻类及少量源于陆相高等植物。根据镜质体反射率、饱和烃气相色谱和某些地球化学指标，表明矿石中有机质呈现异常热成熟特征，这对揭示该矿床热水叠造成矿机制具有指纹意义。本文还首次合理解释矿石中铀与有机碳含量间复杂关系的原因。  相似文献   

High Pressure-Differential Thermal Analysis and Ultrasonic Wave Amplitude Analysis of Ice-Water Equilibrium at 1.5-5.0GPa     

Xu Yousheng  Zheng Haifei  Xie Hongsen  Zhang Yueming  Xu Huigang  Guo Jie 《中国地球化学学报》1996,15(2):153-158

Water is the most active component in all geological systems.It has an important effect on the physical properties of minerals and melts.It also plays a key role in the evolution of the Earth.Accurate thermodynamics data on water are currently confined to pressures below 1.0GPa and temperatures below 900℃.Presented in this paper are new data available on the P-T properties of water at pressures up to 5.0GPa,develoged from differential thermal analysis and ultrasonic wave amplitude analysis.It has been found that there may exist another ternary point at 3.0GPa and that ultrasonic wave amplitude change of ice-water transition shows two inflection points above 2.0GPa, consistent with the two peaks of differential thermal curves above 2.0GPa .It may be a new phenomenon which needs further study.  相似文献   

AN APPARENT TEMPERATURE MODEL BASED ON THERMAL EQUILIBRIUM          下载免费PDF全文

YU Bo  LIU Mei  YAO Kemin 《Acta Meteorologica Sinica》2004,18(1):117-128

In this paper,a comprehensive analysis and review of the advances in the research of human body comfort degree is made.Based on the studies of human thermal equilibrium theories contributed by previous researchers,different apparent temperature models corresponding to different environments are set up in accordance with the current situation and the characteristics of metabolism in different groups of people in China.After case studies and comparison with present dominant human body comfort degree statistical models,it is proved that the apparent temperature models have high rationality and wide adaptability.Furthermore,the comfort scaling standard according to apparent temperature is suggested,which is suitable for the middle latitude regions in China.  相似文献   

The Influence of CO on the Carbon Isotopic Composition of CH_4 in Closed Pyrolysis Experiment With Coal     

刘全有  刘文汇 《中国地球化学学报》2004,23(4)

1IntroductionThecarbonisotopiccompositionofnaturalgasesisregardedasacontanttracerusedinthegeochemicalresearchofnaturalgases .Basedonthecarbonisotopiccomposition ,thegenetictypesofnaturalgasesarebasicallydividedtodeterminethematurationofnaturalgasesandmakegas sourcecorrelations (Stahl,1 973;StahlandCarey ,1 975;Stahletal.,1 977;James ,1 983;Schoell,1 983,1 988;DaiJinxingetal.,1 992 ;FuJiamoetal.,1 992 ;XuYongchang ,1 994 ) .Theformationofnaturalgasescouldbededucedintermsofcarbonisotopicvar…  相似文献   

石油污染对冻土热传导的影响     

Zhuravlev Igor Igorevich 《冰川冻土》2004,26(Z1):128-132

Complex experimental research of thermal properties of oil-contaminated frozen soils was carried out. On the basis of the obtained results the influence of the various factors connected with oil pollution on heat transfer in frozen soils was analyzed. And the model of heat transfer in frozen soils was offered.  相似文献   

多年冻土地区建筑物地基的热稳定性技术   总被引：1，自引：0，他引：1  

Refik M. Bayasan  Anatoly G. Korotchenko 《冰川冻土》2004,26(Z1):201-205

Thermal stabilization of soils (including freezing of thawed soils and cooling of permafrost) is known to be the effective method providing stable support for buildings and structures in cold regions.Seasonal thermo-stabilizers (STS) are mainly used in construction. The predicted climate warming because of natural and man-caused factors determines wide application of STS in permafrost regions. A STS transfers heat from its underground part (evaporator) to the aerial part (condenser) owing to natural temperature difference between them during a cold season. We have been working out and manufacturing different types of two-phase, vapor-liquid STS. Aluminum alloys are used in our STS to prevent corrosion and to increase their efficiency. They are successfully used in the northern regions of Western Siberia, in particular, at the railway Obskaya Bovanenkovo. The paper presents some technical parameters of new STS, the results of their experimental study and computer simulation, as well as experience features.  相似文献   

多年冻土区路桥过渡段的一种新结构     

刘建坤  鲍维猛  黎明  葛建军 《冰川冻土》2004,26(Z1):210-214

The design of roadbed-abutment transition part is always a challenging problem in transportation engineering, especially in permafrost distribution zone. A new type of roadbed-abutment transition part on permafrost was presented, and long-term observation was conducted for the deformation and the thermal regime of a roadbed-abutment transition part in the constructing Qinghai-Tibet Railway. In this paper, a new structure was presented and the observed settlements both in the subgrade and the base and its dependency with the thermal regime (permafrost table) were analyzed. In conclusion the roadbed-a-butment transition method for permafrost distribution zone was evaluated.  相似文献   

Evidence for freeze–thaw events and their implications for rock weathering in northern Canada     

Kevin Hall 《地球表面变化过程与地形》2004,29(1):43-57

Discussions regarding weathering in cold environments generally centre on mechanical processes and on the freeze–thaw mechanism in particular. Despite the almost ubiquitous assumption of freeze–thaw weathering, unequivocal proof of interstitial rock water actually freezing and thawing is singularly lacking. Equally, many studies have used the crossing of 0 °C, or values close to that, as the basis for determining the number of ‘freeze–thaw events’. In order to assess the weathering regime at a site in northern Canada, temperatures were collected at the surface, 1 cm and 3 cm depth for sets of paving bricks, with exposures both vertical and at 45°, orientated to the four cardinal directions. Temperature data were collected at 1 min intervals for 1 year. These data provide unequivocal proof for the occurrence of the freezing and thawing of water on and within the rock (freeze–thaw events). The freeze event is evidenced by the exotherm associated with the release of latent heat as the water actually freezes. This is thought to be the ?rst record of such events from a ?eld situation. More signi?cantly, it was found that the temperature at which freezing occurred varied signi?cantly through the year and that on occasion the 1 cm depth froze prior to the rock surface. The change in freeze temperature is thought to be due to the chemical weathering of the material (coupled with on‐going salt inputs via the melting of snowfall), which, it is shown, could occur throughout the winter despite air temperatures down to ?30 °C. This ?nding regarding chemical weathering is also considered to be highly signi?cant. A number of thermal stress events were also recorded, suggesting that rock weathering in cold regions is a synergistic combination of various chemical and mechanical weathering mechanisms. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献