Thermal convection with non-Newtonian plates   总被引：1，自引：0，他引：1  

Stuart A. Weinstein  Peter L. Olson 《Geophysical Journal International》1992,111(3):515-530

  相似文献   

ON THE SYMMETRIC DEVELOPMENT OF MESOSCALE DISTURBANCES          下载免费PDF全文

Sun Litan  Zhao Ruixing 《Acta Meteorologica Sinica》1991,5(2):197-203

The effects of baroclinic basic flow on a paralleled mesoscale disturbance development are investigated.By using the WKB method,two-dimensional perturbation equations with the anelastic approximation areanalyzed.The result indicates that the symmetric development of a mesoscale disturbance is due to the in-homogeneous thermal wind deviations and unstationality of the basic field.  相似文献   

长江三峡狮子口地区断层最新活动年龄及工程评价   总被引：6，自引：0，他引：6  

李兴唐  袁登维 《地震地质》1991,13(1):78-86

经野外调查和验证,长江三峡狮子口地区的NNW向遥感线性形迹是地形、岩性和小型断层的反映。对区内断层带样品进行的同位素年龄测定,判定出青林口断层在距今49×r04a曾有轻微活动,其余的四条断层第四纪(240×104a)以来无活动。地貌、地质和微震(M<3)分布表明,这些断层现代是不活动的,非控震构造,对三峡水库、大坝工程稳定性无影响  相似文献   

Radon modelling and the heat transfer surface area of the British hot dry rock geothermal reservoir     

N. Hussain 《Journal of Earth System Science》1991,100(1):1-11

A simple thermal model is developed to evaluate the heat exchange surface area of a hot dry rock geothermal reservoir. This model, in conjunction with the Rn model of Andrews and coworkers, is applied to RH12/RH15 system of the British HDR reservoir. Results suggest that although the estimated Rn transfer surface area represents the actual swept surface area, it is between 25 and 45 times larger than the heat transfer surface area. The difference is explained as due to clustering of several fractures within a range of thermal interaction, over the duration of the circulation. It is also shown that the decline in the measured temperatures of circulation fluids since 1985 to the present is consistent with the heat exchange surface area going through a maximum in 1987.  相似文献   

砂金粒度特性研究     

任天秀 《矿物岩石》1991,(4)

本文介绍砂金粒度分析采用筛析-镜测的联合粒度分析方法,并提出砂金粒度的分级意见。  相似文献   

Research on thermal structure and thermal stress of the crust in Bohai Sea and its surroundings     

Hua Tian  Zhili Zhang 《地震学报(英文版)》1992,5(4):699-707

In this paper, the three-dimensional thermal structure and the two-dimensional thermal stress caused by the horizontal inhomogeneity of the thermal structure in the crust of the Bohai Sea and its surroundings were analyzed using the geothermal and the crust structural data by means of the finite element method. As resulted, the horizontal distribution of the temperature in the upper crust is obviously different from that in the lower crust in most part of the region. But the horizontal distribution of the heat flow is constant in the crust. There is a belt where the thermal structure of the crust is intensely changed around Tangshan. There are some different characteristics of the thermal stress of the crust around Tangshan, in the North-China plain, in the Bohai Sea gulf, and in the middle part of the Bohai Sea. Utilizing those results, the distribution features of the seismic activity in the region were explained in this paper. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 29–35, 1992. This project is supported by the Chinese Joint Seismological Science Foundation.  相似文献   

核慢相互作用与地球发电机理论     

马石庄  魏青云 《地球科学进展》1992,7(2):31-34

Important role of the Geodynamo theory playing in the Study on the Earth's Deep Interior in discussed briefly. The study of geomanetic field and its temporal-spatial change is one of the main tools obtaining knowlege about the Earth's deep interior especialy the coer一mantle interabtion. It is the key to advancing the Geodynamo theory to bring to light implication of core-mantle, particularly thermal and chamical , interaction on the model of Geodynamo.  相似文献   

The higher grade metamorphic zonation of the Sambagawa metamorphic belt in central Shikoku, Japan   总被引：5，自引：1，他引：5  

T. HIGASHINO 《Journal of Metamorphic Geology》1990,8(4):413-423

The higher grade metamorphic zonation of the Sambagawa (= Sanbagawa) belt is established for the first time for the whole area of central Shikoku. As discontinuous reactions to define the isograd are absent, the metamorphic grade is primarily determined by the Mg-Fe partitioning between garnet and chlorite along representative traverses. However, for regional mapping, mineralogical features of the pelitic schists, such as using mineral assemblages of more than divariant equilibrium, the modal garnet to chlorite ratio, and the optical properties of chlorite, are employed as auxiliary criteria.
The presence of the highest grade mineral zone in the middle of the structural level is confirmed, but its spatial distribution is far more complex than hitherto accepted. Thermal axes are now confirmed at three different structural levels. A model is presented in which the stacking of thrust sheets of different grade took place while metamorphic reactions were in progress. Thermal readjustment brought a continuous metamorphic temperature gradient across and within the thrust sheets. Tectonic blocks of metagabbro and ultramafic rock were emplaced synchronously with thinning and subsequently also re-equilibrated. Local anomalies of metamorphic grade, represented by mixing of schists of different metamorphic grade, exist, but they are due to a later stage event.  相似文献   

湖南省煤的热谱特征及其研究意义   总被引：1，自引：0，他引：1  

陈方 《湖南地质》1990,9(1):60-64,77

煤的热谱(DTA、DSC、TG)特征与煤的其他物化特征参数一样,是煤大分子结构特征的反映,可作为研究煤化作用的参考和无烟煤分类的辅助标志。本文介绍了湖南省不同变质程度煤的热谱特征和试验所发现的热谱曲线、峰温与煤及瓦斯突出强度、无烟煤三小类的关系,并试验证明利用热分析曲线进行煤层对比的可能性。  相似文献   

超临界水的特性及其对地球深部物质研究的意义   总被引：5，自引：1，他引：5  

徐有生  侯渭 《地球科学进展》1995,10(5):445-449

水在超临界状态下有着与标准状态明显不同的行为，超临界水具有许多的特殊性质，如强烈的氧化作用，很强的溶解性能，以及通过温度和压力变化控制其密度在类似蒸汽到类似液体的密度之间等。水在约４００℃的超临界温度下，几乎有的氢键都裂解了，超临界水的这一性质很可能是超临界水具有许多特殊性质的主要原因，超临状态地幔水的存在，不仅对球物理场的性质有重要影响，崦且对于地质构造演化、地球化学动力学、成矿作用，以及深部地  相似文献