内蒙狼山霍各乞矿床条带状含铜石英岩成因的讨论   总被引：5，自引：0，他引：5  

孙宝忠  徐贵忠 《岩石学报》1997,13(2):226-232

内蒙霍各乞条带状含铜石英岩的结构、构造、阴极发光、化学常量元素、稀土元素及其所含的电气石的矿物成分、石英包体测温等方面的特点与加拿大沙利文矿床热水沉积和我国大厂热水沉积矿床中的热水沉积岩－条带状硅质岩及电气石岩十分相似，可以证明了霍各乞条带状含铜石英岩为热水沉积成因  相似文献   

西秦岭铀成矿带中志留系硅岩灰岩的成因研究     

赵兵 《岩石学报》1997,13(2):233-244

通过大量的剖面测制和室内分析，从岩石的地质产状、岩石学及地球化学特别是稀土元素地球化学方面研究了西秦岭铀成矿带中硅、灰岩的成因。原始沉积的泥晶灰岩和球粒泥晶灰岩沉积于水下高地较低能环境，球粒主要为粪球粒及少量硅质生物体。硅岩具生物化学沉积（Ｉ类）和由灰岩硅化（交代）成因（Ｉ类）两种成因类型，它们在地质产状、结构构造、常量元素及稀土元素地球化学等方面都存在显著差异。在综合分析的基础上建立了西秦岭铀成矿带早志留世沉积环境模式  相似文献   

二连盆地找铀沉积层位的地震勘探研究     

徐贵来  梅汝吾 《铀矿地质》1997,13(4):226-231

本文通过对二连盆地努和廷矿床地震地质条件分析，采用了３种震源在矿床及其外围作地震干扰波调查，提出了工作区特征的低速多次波干扰的解决办法和探测１００ｍ以上的野外工作方案，并在ＳＰⅠ和ＳＰⅡ两条试验剖面测量中得到满意的验证。研究成果已在生产单位中得到应用。  相似文献   

澜沧—耿马震区构造能流图象研究   总被引：1，自引：0，他引：1  

周瑞琦  李世成 《地震研究》1996,19(2):168-174

根据澜沧－耿马震区构造能流图象的研究，其结果表明震产生了两条长度分别为４２公里、５５公里的北西向主破裂，同时产生了几北东－近南北向的次级破裂。通过与宏观资料的对比，可观看出构造能流图象和震害分布具有较好的一致性。  相似文献   

太阳活动上升期源表面太阳风质量流量的速度关系分析          下载免费PDF全文

魏奉思  周清军 《地球物理学报》1996,39(Z1):1-6

以ＩＰＳ速度、光球磁场、Ｋ─日冕偏振亮度和卫星实地观测数据为基础，综合生成处于太阳活动上升期的１９７６年１０个太阳周（１６４３─１６５２卡林顿周）的源表面高度（Ｒ＝２．５Ｒ_ｓ，Ｒ_ｓ为太阳半径）和日球空间中（ＩＡＵ）太阳同质量流量速度谱。结果表明，速度谱存在与太阳活动上升期一致的＂三段＂结构，且各段分别与不同的磁结构区相对应。  相似文献   

皖南震旦系冰期地层沉积特征          下载免费PDF全文

张启锐 《地质科学》1996,31(2):147-153

通过野外观察,发现了以下沉积构造：下冰厂涯埠组的落石构造和与下伏休宁组的连续沉积关系;间冰期洋安组有水平层理和韵律性水平层理;上冰期雷公坞组有顶、底部的重力流沉积构造,外来岩块,变形层纹,砾石团和撕裂片等。根据这些资料,认为本区下涯埠组的沉积环境可能是三角洲前,洋安组为潮下浅海,上冰雷公坞组则为陆坡或外陆架。  相似文献   

热桩与空气间的对流换热规律研究   总被引：3，自引：0，他引：3  

吴青柏  梁素云 《冰川冻土》1996,18(1):37-42

通过低温室内试验研究热桩与空气间的对流换热规律结果表明，热桩的热流量和放热系数随气温、风速的变化而变化，但因冷凝器特定外形热阻及热桩内凝结换热的影响，气温大于－１２℃和风速大于２ｍ／ｓ时，热桩与空气间的对流换热效率降低。  相似文献   

An analysis of MONTBLEX data on heat and momentum flux at Jodhpur     

Kusuma G. Rao  R. Narasimha  A. Prabhu 《Journal of Earth System Science》1996,105(3):309-323

Parameterization of sensible heat and momentum fluxes as inferred from an analysis of tower observations archived during MONTBLEX-90 at Jodhpur is proposed, both in terms of standard exchange coefficientsC _H andC _D respectively and also according to free convection scaling. Both coefficients increase rapidly at low winds (the latter more strongly) and with increasing instability. All the sensible heat flux data at Jodhpur (wind speed at 10 m Ū₁₀ < 8 ms⁻¹) also obey free convection scaling, with the flux proportional to the ‘4/3’ power of an appropriate temperature difference such as that between 1 and 30 m. Furthermore, for Ū₁₀ < 4 ms⁻¹ the momentum flux displays a linear dependence on wind speed.  相似文献   

Effective porosity and specific yield of a sedimentary rock determined by a field tracing test using tritium as a tracer     

H. Ii  Y. Ohtsuka  N. Mori  T. Inagaki  S. Misawa 《Environmental Geology》1996,27(3):170-177

Effective porosity value was analyzed from the tritium concentration of sampled groundwater using a three-dimensional groundwater-flow and advection-dispersion code based on the finite element method. The effective porosity value was about 10%. Porosity values measured from core samples were 7–15%. The groundwater flow velocity estimated from the tritium concentrations was about 1 × 10^–5 cm s^–1. Therefore, during the low groundwater flow velocity condition, effective porosity and porosity values were the same. At the same test site, a 0.48% effective porosity value, determined by another tracer test injecting Br^– solution into the aquifer during groundwater level change, was smaller than the porosity value when the flow velocity was 1.8×10^–2 cm s^–1. Thus the effective porosity value is concluded to be due to groundwater flow velocity. The specific yield value was calculated to be 0.6% by the total volume of tunnel seepage water and the total volume of the rock unsaturated during tunnel construction. However, as pore water continued to be drained after the groundwater level change was completed, the specific yield value became larger than 0.6%. Thus specific yield value is concluded to be due to drainage time.  相似文献   

Estimation of surface heat flux and inversion height with a Doppler acoustic sounder     

L. K. Sadani  B. S. Murthy 《Journal of Earth System Science》1996,105(3):289-307

In this paper, acoustic sounder (sodar) derived vertical velocity variance (σ _w ² ) and inversion height (Z _i) are used to compute the surface heat flux during the convective activity in the morning hours. The surface heat flux computed by these methods is found to be of the same order of magnitude as that obtained from tower measurements. Inversion heights derived from sodar reflectivity profiles averaged for an hour are compared with those obtained from the σ _w ² /Z profile. Variation of σ _w ² in the mixed layer is discussed. The data were collected during the Monsoon Trough Boundary Layer Experiment 1990 at Kharagpur. The analysis is made for four days which represent the pre-monsoon, onset, active and relatively weak phases of the summer monsoon 1990. The interaction of the ABL with the monsoon activity is studied in terms of the variation of inversion height, vertical velocity variance and surface heat flux as monsoon progresses from June to August.  相似文献