X荧光勘查金矿技术的应用与进展     

周四春  谢庭周  葛良全  赖万昌  赵友清  章晔 《物探化探计算技术》1996,(S5)

本文介绍了 X荧光勘查金矿技术及找金成果 ,并论述了该技术的进展  相似文献   

应变软化在甘肃红柳河辉长质糜棱岩形成中的作用   总被引：4，自引：0，他引：4  

谢艳霞  刘瑞Xun 《矿物岩石》1996,16(2):34-39

本文论述的辉长质糜棱岩发现于甘肃北山红柳河蛇绿岩套中。在简单说明了糜棱岩的地质背景及特征、描述了变形岩石的显微构造特征之后，重点对糜棱岩形成过程中的应变软化机制作了论述。探讨了软化岩的存在、组构调整、粒度缩小，长石的动态重结晶，水以及主导变形机制的不断调整与转化等应变软化机制，在应力作用下使岩石逐步软化过程中所起的作用，得出这种糜棱岩是在拆离剪切作用下，应力在蛇绿岩中的软化岩石辉长岩中集中，从而形  相似文献   

黄铁矿表面及其与Au（HS）2^—溶液作用的STM研究   总被引：5，自引：0，他引：5  

张世柏  张平城 《矿物学报》1996,16(1):28-32,T001

本文用ＳＴＭ研究了黄铁矿和方铅矿表面的原子结构、纳米级微形貌、电子态分布及其吸附态的特点。ＳＴＭ电流图象揭示了表面缺陷与表面电子态之间的对应关系，硫化和的表面的化学反应活性可能是表现缺陷引起的局域导电性增强有关。ＳＴＭ观察进一步表明黄铁矿和方铅矿对金的硫氢配合物的吸附作用优先发生于扭折位和台阶边缘等高能部位，反映出吸附态的分布也是与表面电子态分布相对应的。这样就从微观领域考证了硫化物表面对化学活性  相似文献   

High Pressure-Differential Thermal Analysis and Ultrasonic Wave Amplitude Analysis of Ice-Water Equilibrium at 1.5-5.0GPa     

Xu Yousheng  Zheng Haifei  Xie Hongsen  Zhang Yueming  Xu Huigang  Guo Jie 《中国地球化学学报》1996,15(2):153-158

Water is the most active component in all geological systems.It has an important effect on the physical properties of minerals and melts.It also plays a key role in the evolution of the Earth.Accurate thermodynamics data on water are currently confined to pressures below 1.0GPa and temperatures below 900℃.Presented in this paper are new data available on the P-T properties of water at pressures up to 5.0GPa,develoged from differential thermal analysis and ultrasonic wave amplitude analysis.It has been found that there may exist another ternary point at 3.0GPa and that ultrasonic wave amplitude change of ice-water transition shows two inflection points above 2.0GPa, consistent with the two peaks of differential thermal curves above 2.0GPa .It may be a new phenomenon which needs further study.  相似文献   

南极罗斯岛及泰勒谷地区火山岩的地球化学特征及成因讨论   总被引：2，自引：0，他引：2  

石林  解广轰 《岩石学报》1997,13(4):488-498

利用微量元素和Ｓｒ，Ｎｄ，Ｐｂ同位素资料，得出了南极罗斯岛及泰勒谷地区火山岩来自于上地幔，五个地区火山岩具有相同的源区。岩石具有大洋岛屿玄武岩（ＯＩＢ）的特征。来自地幔的火山喷发的岩浆未遭受地壳物质的混染作用。地幔源区是具有高μ（＝２０６Ｐｂ／２０４Ｐｂ）比值的地幔组分ＨＩＭＵ与亏损地幔组分ＤＭＭ混合作用的结果，其中以ＨＩＭＵ组分为主，原生岩浆由具ＨＩＭＵ组分特征的深部地幔柱与浅部的ＤＭＭ混合而成。  相似文献   

0.25—3.75GPa和20—370℃条件下0.025molNaCl溶液电导率研究          下载免费PDF全文

郑海飞  谢鸿森 《地质学报》1997,71(3):274-280

在０．２５－３．７５ＧＰａ和２０－３７０℃条件下测量了ＮａＣｌ溶液的电导率。结果表明（１）电导率随温度增高而增大，且电导率的对数与温度的倒数为线性关系，但不同压力不其斜率不同。（２）电导率与压力的 关系较为复杂，存在着不连续性。即在２．２５－３．３７ＧＰａ压力范围，电导率随压力增大而增大；在１．２５－２．００ＧＰａ压力范围，电导率与压力几乎无关；０．７５ＧＰａ压力的电导率高于相邻力的电导率。上述。  相似文献   

论江西双桥山群的底界问题     

谢国刚 《地质通报》1997,(4)

１∶５万庐山地区区域地质调查和专题研究，在星子县黄岭一带发现一套巨厚层状复成分的变质砾岩。根据该变质砾岩的砾石成分、变形组构及区域分布特点，以及上部（双桥山群）与下部（星子岩群）地层在变质与变形方面存在明显差别，认为变质砾岩应属于双桥山群的底部层位，是中元古界双桥山群与下伏下元古界星子岩群不整合关系的佐证。由于受后期构造叠加改造的影响，现今二者呈断层或隐蔽不整合接触关系。  相似文献   

瑶沟等地区勘查金矿的放射性和非放射性气体地球化学方法的研究     

游云飞  刘开兴 《铀矿地质》1997,13(1):43-48

本文介绍了瑶沟等地区勘查金矿的放射性和非放射性气体地球化学方法的研究成果：基本查明了应用本方法勘查金矿的主要条件是金矿中伴生有足够的Ｕ，Ｈｇ和碳酸盐矿物；研制成了壤中气（Ｒｎ－ＣＯ２）联测技术，提高了测量质量和探测深部矿体的能力；利用壤中气（Ｒｎ－ＣＯ２）异常进行了成矿预测，并已获得成功。  相似文献   

Conductivity of NaCl solution at 0.4–5.0 GPa and 25–500 °C     

Yousheng Xu  Hongsen Xie  Jie Guo  Haifei Zheng  Yueming Zhang  Maoshuang Song 《中国科学D辑(英文版)》1997,40(4):398-402

NaCI-H₂O is the most fundamental ternary system in geology. Until now, the measurements of electrical conductivity of NaCl solutions are still little at high pressures (> O.5 GPa) We measured the conductivity of 0.01 m NaCl solution at 0.4–5.0 GPa and 25-500°C. The results are consistent with that of Quist and Marshall (1968) at 0.4 GPa. The conductivity of NaCl solution increases with increasing temperature. The results also show that the conductivity of NaCl solution changes little with increasing pressure below 1.5 GPa and changes rapidly with increasing pressure above 1.5 GPa. The rapid increase of the conductivity of NaCl solution may play an important role in many geological processes (such as the genesis of ore deposits under hydrothermal condition) and other fields. Project supported by the National Natural Science Foundation of China.  相似文献   

Properties of wave velocity for two types of granitoids at high pressure and temperature and their geological meaning   总被引：1，自引：0，他引：1  

Shufeng Yang  Hanlin Chen  Jishuang Jiang  Guoqiang Zhu  Hongshen Xie  Wei Hou  Yueming Zhang  Huigang Xu 《中国科学D辑(英文版)》1997,40(5):470-476

The wave velocity for two types of granitoids was measured using the analytic method of full-wave vibration at high pressure and high temperature. The laws of velocity changes for them differ with the pressure boost and temperature rise, and the velocity change of S-type is more violent than that of I-type. The “softening point” of compressional wave velocity (V μ) is also revealed during the measurement for two types of granitoids imitating the pressure and temperature at a certain depth. But the depth of “softening”, V_p after “softening” and the percentage of V_p’s drop around the “sofrening point” for two types of granitoids are obviously different. The depth of “softening” is 15 km approximately and V_p after “softening” is 5.62 km/s for S-type granitoid. But for I-type granitoid the depth of “softening” is 26 km approximately and V_p after “softening” is 6. 08 km/s. Through careful analysis of rock slices after the experiment, it was found that the “softening” of elastic-wave velocity is caused by the partial melting of granite. Combined with the results of geophysical prospecting, these results suggest that the low-velocity layers developing in the interior of Earth crust are related to thc partial melting of different types of granitoids. The formation of the low-velocity layer in the upper-middle Earth crust is closely related to the development of S-type granitoid, but that in the lower Earth crust is closely related to the development of I-type granitoid.  相似文献