陕蒙交界地区碎屑岩风化成因浅析     

董恒笔  张清盛  孔文年  朱永宏 《陕西地质》2007,25(2):36-43

陕蒙交界地区基岩均具强风化,由此造成当地环境恶化、下游地区生态破坏和灾害积累。其形成机理应与岩石本身的物质组成、自然地理环境、地质构造状况、水文地质条件及其物理化学条件有关。而南部地区,由于上述诸因素的差别,基岩风化微弱。  相似文献   

Physical structure features of the crust at southeast region of Tibetan Plateau     

Liu Hongbing  Kong Xiangru  Xiaobing Ma  Wang Qianshen  Yan Yongli  Yan Yafen  Yang Zhiqiang 《中国科学D辑(英文版)》2001,44(1):64-76

Chemical reactions of plagioclase, biotite and their single minerals, as well as a mineral mixture of (plagioclase+biotite+quartz), with KCl and (KCl+KHCO₃) solutions were carried out at 150–400°C and 50–80 MPa. Experiments show that alkaline fluid promotes plagioclase’s changing into potash feldspar, while acid fluid helps plagioclase, potash feldspar and biotite alteration form chlorite and sericite. After chemical reaction the acidity-alkalinity of solutions often changes reversely. It was observed that gold dissolved from the tube wall and recrystallized on the surfaces of biotite and pyrite. Therefore the transportation and enrichment of gold are related to the elementary effect of the fluid-mineral interfaces. Fe³⁺-Fe²⁺, as an oxidition-reduction agent, and volatile components Cl^- and CO₂ play important roles in the reaction process  相似文献   

Magnetotelluric sounding results in eastern Tibetan Plateau     

Ma Xiaobing  Kong Xiangru  Liu Hongbing  Yan Yongli 《中国科学D辑(英文版)》2001,44(1):79-85

The results of Zayü-Qingshuihe MT sounding profile carried out in eastern Tibetan Plateau are presented in this paper. Using 2-D RRI method, the resistivity distribution with depth is obtained along the profile. It is featured by the resistivity zones in the horizontal direction and layers in the vertical direction. The Bangong-Nujiang suture zone and Jinshajiang suture zone are both important electrical conductivity-separating zones in the plateau, and the former is a zone with relatively low resistivity while the latter is an electrical conductivity gradient zone. The highly electrical conductive bodies in the mid and lower crust of northern Qiangtang and Bayan Har Terrain might be caused by regional melting due to shear heating during the process of subduction in tectonic evolution.  相似文献   

CT球管耙心偏移的检测与判断     

孔秋雁 《CT理论与应用研究》1996,5(2):30-31

ＣＴ球管耙偏移是较为少见的，本文以ＧＥ ｓｙｔｅｃ ２０００ｉ为例，详细描述了由此引起的扫描停止，机器伪影等现象及分析、处理过程，并通过与管衰老相比较。进一步述了两者的共同点及在图像质量，管电流稳定性，检测过程等方面的区别，最后总结出一套检测与判断耙心偏移的方法。  相似文献   

电磁感应研究的进展与展望   总被引：1，自引：0，他引：1  

孔祥儒 《地球物理学进展》1992,(2)

最近几年国内外电磁感应研究在以下几方面取得迅速发展:国际和区域合作大尺度电磁感应研究;海洋电磁测深;能源、资源勘探和环境监测等应用研究;理论分析和实验研究;数据采集系统.  相似文献   

结合卫星像影分析水库地震的形成原因     

孔凡健 《华南地震》1992,(2)

本文应用卫星影像分析了我国几个水库诱发地震震例,提出了库区内应力叠加模式,对水库地震的成因,做了探讨。  相似文献   

新疆吉木乃县塔斯特金矿成因探讨   总被引：2，自引：1，他引：2  

董永观  邹永兴  王敬东  孔庆寿 《新疆地质》1992,(2)

塔斯特金矿床为一破碎带蚀变岩型金矿。通过稳定同位素、包裹体、成矿元素及成矿物理化学条件的研究,提出该矿的成矿溶液是岩浆水和大气降水之混合物。成矿元素主要来自深源侵入的二长花岗岩。成矿温度为中偏高温。成矿溶液为高盐度、高密度和高挥发份条件。为深源岩浆侵入的花岗岩中破碎蚀变岩型金矿。  相似文献   

中国二八面体含铝蒙皂石矿物化学和晶体化学的特征     

潘建强  孔佑华 《矿物学报》1993,13(4):293-302

通过对我国６４个二八面体含铝蒙皂石矿物化学及晶体化学数据的统计分析，研究了它们的矿物化学及晶体化学的基本特征，并得出八面体组分是影响蒙皂石矿物学及物理化学性质的主要因素，在此基础上，利用ＡｌＡｌ－ＡｌＦｅ－ＡｌＭｇ三角图划分了我国二八面体含铝蒙皂石的晶体化学类型，并对原分类图进行了模式化处理，使ＡｌＡｌ－ＡｌＦｅ－ＡｌＭｇ图更具实际意义，蒙皂石的阳离子交换容量与晶体化学模型有对应性，并受八面体三价  相似文献   

涠洲岛附近海面3～6月强对流大风天气气候特征分析     

邓朝亮  孔宁谦  余志峰 《气象研究与应用》1999,20(2):31-33

分析了涠洲岛附近海面１９７８～１９９６年３～６月强对流大风天气过程的种类、气候特征、环流形势、影响的天气系统等,了解其出现时间、系统来向、风力大小,为广西海上交通运输、渔业生产、石油平台等防御突发性强对流大风天气提供科学依据。  相似文献   

Relativistic shock waves in double radio sources     

Kong Xiang-yan  Xu Yan-he  Zhong Zhao-xin 《Chinese Astronomy and Astrophysics》1982,6(4):325-332

Using a model of relativistic collision between two media and based on the theory of shock waves in an ideal relativistic fluid, we calculate in detail, the main parameters at the Initial stage of the formation of radio component sources, including the separation velocity and the travelling speed of the shock. The evolution of the hot spot as it moved from within the galaxy to a quasi-steady state in the intergalactic space is discussed qualitatively. Lastly, the parameters in the quasi-steady state are approximately evaluated using the formulae for strong shocks. The results obtained are in overall agreement with observations.  相似文献