鲁西纯橄岩捕虏体中富硅质熔（流）体的交代作用：对中生代岩石圈地幔减薄的意义   总被引：15，自引：0，他引：15       下载免费PDF全文

许文良王冬艳  王清海高山 林景仟 《地质学报》2004,78(1):72-80

鲁西中生代辉长-闪长质岩石中纯橄岩捕虏体的岩石学、矿物化学及微量元素地球化学研究表明,纯橄岩捕虏体代表了古老岩石圈地幔的残留;地幔纯橄岩捕虏体中存在两种类型的交代作用,一是以填隙型金云母为代表的早期富含CO_2和H_2O的不活动流体的交代作用;二是以斜方辉石交代脉和网络状斜方辉石为代表的晚期富硅质熔(流)体的交代作用。后者代表了起源于软流圈的富硅质熔(流)体对古老岩石圈地幔的一种化学侵蚀。这对认识华北地块东部中生代岩石圈地幔的性质以及岩石圈减薄机制具有重要意义。  相似文献   

KLWC-5含水量仪原理及在人工增雨中的应用   总被引：4，自引：0，他引：4  

王柏忠刘卫国  王广河党娟 《气象科技》2004,32(4):294-296

简要介绍了热线含水量仪的研究进展，讨论了目前人工增雨试验中使用的机载KLWC含水量仪的工作原理、显示模块及其在微物理探测中的应用。这些飞机观测数据资料有助于加深人们对云物理结构的了解，从而提高人工增雨作业效率。  相似文献   

Control Volume Method for the Thermal Convection Problem in a Rotating Spherical Shell: Test on the Benchmark Solution     

Hejda  P.  Reshetnyak  M. 《Studia Geophysica et Geodaetica》2004,48(4):741-746

The development of the control volume method for the thermal convection problem in a rotating spherical shell is presented. In contrast to the spectral methods, commonly used in geodynamo simulations, the control volume method belongs to the class of grid methods (the solution is approximated by a set of discrete values in physical space). In the present paper we concentrate on some problems of convergence and stability of the method. Case 0 of the numerical dynamo benchmark (Christensen et al., 2001, Phys. Earth Planet. Inter., 128, 25-34) was used to check the correctness of our computer code. The results demonstrate good convergence to the suggested standard solution.  相似文献   

Seismic response of base-isolated liquid storage tanks considering fluid–structure–soil interaction in time domain     

Kyung Hwan Cho  Moon Kyum Kim  Yun Mook Lim  Seong Yong Cho 《Soil Dynamics and Earthquake Engineering》2004,24(11):839-852

The seismic response analysis of a base-isolated liquid storage tank on a half-space was examined using a coupling method that combines the finite elements and boundary elements. The coupled dynamic system that considers the base isolation system and soil–structure interaction effect is formulated in time domain to evaluate accurately the seismic response of a liquid storage tank. Finite elements for a structure and boundary elements for liquid are coupled using equilibrium and compatibility conditions. The base isolation system is modeled using the biaxial hysteretic element. The homogeneous half-space is idealized using the simple spring-dashpot model with frequency-independent coefficients. Some numerical examples are presented to demonstrate accuracy and applicability of the developed method.Consequently, a general numerical algorithm that can analyze the dynamic response of base-isolated liquid storage tanks on homogeneous half-space is developed in three-dimensional coordinates and dynamic response analysis is performed in time domain.  相似文献   

提高水泥土搅拌桩施工质量的方法与技术     

陈荣斌  裴捷 《上海国土资源》2002,(3):54-57

水泥土搅拌桩的质量取决于喷浆量是否达到设计要求及浆量在桩身中的均匀度。作者对安装了“水泥土搅拌桩浆量监测记录仪”进行施工的工程经验进行了总结，并对施工工艺的改进进行了初步探讨。  相似文献   

轻非水相液体在地下环境中的运移特征与模拟预测研究   总被引：13，自引：0，他引：13       下载免费PDF全文

郑德凤  赵勇胜  王本德 《水科学进展》2002,13(3):321-325

通过自行设计制备的二维砂箱模拟轻非水相液体(LNAPL)在湿润多孔介质中的渗漏,得出LNAPL在地下环境中的入渗、迁移及分布规律,并利用多相流体理论对其污染机理进行分析.在实验基础上建立模型来预测渗漏的基本特征,即渗流带中污染锋面扩展速度和透镜体的最终形状,预测结果与实测结果较为接近.这种预测模型对控制和治理地下水中LNAPL污染是至关重要的.  相似文献   

基于无合作目标激光测距仪的激光液位测量系统   总被引：1，自引：0，他引：1  

何平安  李松  韩建中  袁强  黄卫军  曾爱军 《测绘信息与工程》2002,27(4):3-5

利用无合作目标激光测距仪作为液位传感器 ,研究开发了激光液位实时在线测量系统 ,解决了激光测距仪在液位测量过程中液面定向反射、二次反射误差和振动、晃动诸因素引起的液面抖动对测量的影响等技术难题 ,研制了适用于石化行业各种液位测量用的本质安全型防爆二次仪表 ,完成了实验测试和比对实验 ,并进行了初步的安装、调试与测试。实验表明 ,激光测距仪能够较好地用于各种液位测量场合 ,测试精度可达± 3mm。  相似文献   

Study on the carbonate ocelli-bearing lamprophyre dykes in the Ailaoshan gold deposit zone, Yunnan Province   总被引：1，自引：0，他引：1  

黄智龙  刘丛强  肖化云  韩润生  许成  李文博  钟昆明 《中国科学D辑(英文版)》2002,45(6):494-502

Three carbonate ocelli-bearing lamprophyre dykes have been found in the Laowangzhai and Beiya gold orefields in the northern sector of the Ailaoshan gold deposit zone, Yunnan Province. Ocelli in the lamprophyre dykes are carbonates composed mainly of dolomite and calcite. Their trace elements, REE and C isotopic compositions are characteristic of carbonatite and the main mineral assemblages, major elements, trace elements and REE in the matrix are similar to those in the carbonate ocelli-barren lamprophyre dykes in the orefields, which are calc-alkaline lamprophyres that derived from the fertile mantle. The results indicate that the carbonate ocelli-bearing lamprophyre dykes in this area were produced at the time when the Himalayan lamprophyre magma evolved to a relatively late stage of silicate-carbonate liquid immiscibility. In the process of magmatic evolution there took place magmatic degassing with CO₂ and H₂O as the dominant released gases.  相似文献   

A differential scheme for elastic properties of rocks with dry or saturated cracks   总被引：1，自引：0，他引：1  

James G. Berryman  Steven R. Pride  Herbert F. Wang 《Geophysical Journal International》2002,151(2):597-611

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液态二氧化碳洗井工艺应用与效果     

郑宁山  孙永福 《上海国土资源》1991,(3):38-43

应用液态 CO_2洗井,是清洗深井的一项洗井新技术。本文介绍液态 CO_2洗井原理、方法、工艺与注意事项,并以实例论述清洗深井的效果。  相似文献