新田宁远道县一带玄武质火山岩的地球化学研究   总被引：17，自引：1，他引：17  

黄国祥 《湖南地质》1989,8(3):33-38

本文阐述了该区玄武质火山岩及其中包体的微量元素及同位素地球化学特征,并对玄武岩浆成因与演化进行了探讨。玄武岩与其中的包体具有不同的过渡金属元素分配型式。二辉橄榄岩包体具亏损地幔岩性质。玄武岩稀土元素的配分特点与世界上典型的大陆裂谷型玄武岩相似。锶、铅、氧同位素的初步研究结果对岩浆的幔源性质及所经受的同化混染作用提供了一些线索。  相似文献   

红砂岩修筑浆砌石坝的岩土工程研究   总被引：9，自引：0，他引：9  

张剑锋  岳国生  黄春耈 《上海国土资源》1989,(2)

红砂岩为中低强度岩层、岩相复杂多变,较易风化、软化。本文通过工程实践阐述了在红砂岩分布地区利用当地材料建造浆砌块石坝的岩土工程研究,开创了红砂岩筑坝的先例。  相似文献   

上海地区深部构造特征和地震活动趋势探讨     

黄兆熊  高德章 《上海国土资源》1989,(4)

本文介绍由重磁资料计算上海地区居里面、莫霍面、均衡重力异常及地幔流应力场的方法和成果,并在对成果初步分析的基础上,探讨了深部地质构造特征及其与地震活动趋势的关系,其中着重讨论了居里面及其与地震活动的关系。文章最后提出了对上海地区地震活动趋势的几点认识。  相似文献   

Application of the E-ε closure model to simulations of mesoscale topographic effects     

Ching-Yuang Huang  Sethu Raman 《Boundary-Layer Meteorology》1989,49(1-2):169-195

A mesoscale Planetary Boundary Layer (PBL) model with a simple turbulence closure scheme based on the turbulence kinetic energy (TKE) equation and the dissipation () equation is used to simulate atmospheric flow over mesoscale topography. Comparative studies with different parameterizations suggest that with a proper closure assumption for turbulence dissipation, the E-model can simulate the circulation induced by the mesoscale topography with results similar to those obtained using the E- model. On the other hand, the first-order closure using O'Brien's cubic interpolation for eddy diffusivities (K) generally produces much larger K profiles in the stable and the unstable regions, which is believed to be due to the overprediction of the height of the PBL. All models with the TKE equation yield quite similar ensemble mean fields, which are found to be little sensitive to the closure assumption for turbulence dissipation, though their predicted magnitudes of TKE and K may differ appreciably. A discussion on the diurnal evolution of the mesoscale topography-induced circulation and the spatial variations of the turbulence fluxes in the surface layer is also given based on the E- model results.  相似文献   

中国大陆地区热流数据的分布及其初步分析          下载免费PDF全文

黄少鹏 《地震地质》1989,11(3):17

本文首次系统地收集整理了观测资料比较齐全、国内公开发表的热流数据167个,并对之进行了初步分析。这些数据的地理分布还很不均匀,热流值变化范围为25—245mWm-2,多种平均方法得到的结果表明,中国大陆区域代表性热流值范围为61—68mWm-2。作者所作的经纬度网格和条带统计还揭示,数据覆盖区内热流沿经、纬向的分布有明显的差异,纬向条带平均热流值看来具有波状起伏变化的规律。这一结果已经得到日本及其周围海域热流数据的初步印证,如果获得更广泛的证实,无疑具有深刻的地质和地球物理意义  相似文献   

Gold concentration from well water by the hydroelectrical extraction method     

Wu Zhonghua  Jin Yangfe  Huang Hongku 《Journal of Geochemical Exploration》1989,33(1-3)

An experimental survey of the gold concentrated from well water by a hydroelectrical extraction (HEE) method has been carried out in the famous Au metallogenic province in the eastern part of Shandong Province in northeastern China. This method is based on the existence of ionic Au in groundwater around ore bodies. Under the action of an external electric field, ionic Au migrates toward the cathode where the metal is absorbed by a special absorbent attached to the cathode. Promising areas for further exploration can be evaluated from the amount of Au in the absorbent.Distinct Au anomalies were discovered by the experimental survey. The results from the follow-up study of some of these anomalies have shown that most of them are related to the known placer Au deposits and to the primary Au occurrences. However, two new Au prospects and several new Au sources have been found which offer new targets for Au hunting in the area.The hydroelectrical extraction method is an effective technique of looking for Au in areas covered with transported overburden. Since the Au in well water can be concentrated on the cathode with the absorbent, the sensitivity requirement for Au analysis could be reduced. The method also provides a useful tool for the exploration of blind placer Au.  相似文献   

陕西金堆城钼矿床中铁钼华的矿物学特征及其意义   总被引：1，自引：0，他引：1  

黄典豪 《岩石矿物学杂志》1989,8(4):352-360

铁钼华产于陕西金堆城斑岩钼矿床的氧化带内,该矿物以往被认为是钼华。笔者对该矿物进行了物理光学性质、化学成分、X射线衍射、穆斯堡尔谱、红外光谱以及失重和差热分析的研究,定名为铁钼华,其分子式为Fe_2(MoO_4)_3·6.8H_2O。同时,将其与国外天然和人工合成的铁钼华作了对比,确定其是在酸性氧化环境中形成的次生矿物。它是原生钼矿床的直接找矿标志。  相似文献   

两个古铜辉石样品的G.P区研究     

黄婉康  康振川 《矿物学报》1989,9(2):104-111

在两个斜方辉石样品中观察到G.P.区亚稳相。内蒙古暗色辉长岩古铜辉石成分是En_(77)Fs_(18·6)Wo_(4·4),其高分辨象显示了密集的单层G.P.区;玄武岩中变辉长岩包体古铜辉石成分是En_(72·2)Fs_(25·7)Wo_(2·1),具双层G.P.区。该包体与具多层G.P.区的月岩橄长岩相似,后期冷却极快。在地体火成岩体结晶和冷却过程中易出现单层G.P.区,而岩体的大小,冷却的快慢可能影响G.P.区的密度。对N-14样品不同放大倍数的高分辨象G.P.区线密度和面密度的统计值同样具代表性。文中设想了G.P.区出溶的假二元系相图。  相似文献   

Blasting Technique and Process for Rock Ridge in a Wave Power Station     

Yang Chuanjia  Huang Chengxian  Song Dawei 《岩土力学》1989,10(3):51-59

A technique of peripheral presplitting blast with multi-ignitions of millisecond detonaters is put forward in this paper based on the characteristics of ridge blast for wave power station, the main ridge blasting with deep hole smooth blasting and casting blast of inclined holes. The formula to calculate explosive charge is established. Finally, the theory and process of this technique for ridge blasting are discussed.  相似文献   

不规则水体断面面积及体积的计算—兼论多面函数内插模型的精度     

黄谟涛 《武汉大学学报(信息科学版)》1988,(2)

本文以吕言的三次曲面函数内插模型为基础,推出一套计算不规则水体断面面积及其体积的封闭公式,并用实例加以验证。最后从另一侧面探讨了多面函数模型的内插精度问题。本文得到的公式同样适用于工程上的土方量及断面面积的计算。  相似文献