对阿勒泰富铁矿成矿区地质找矿的几点认识          下载免费PDF全文

厉小钧 《地质找矿论丛》2003,18(Z1):96-99

阿勒泰富铁矿成矿区成矿地质条件与哈萨克斯坦矿区阿勒泰相似,据现有资料反映,已具备寻找中-大型铁及多金属矿的条件,因此在该区加强地质找矿,特别是运用综合方法找矿,可达到预期目的.  相似文献   

研究海淀区产业结构变化对土地资源利用的影响   总被引：4，自引：0，他引：4  

刘平辉  郝晋珉  李旭霖  任浩  李芳芳  王秀芬 《华东地质学院学报》2003,26(1):5-9

海淀区作为北京市城市边缘区的最重要区域之一，其土地资源利用随着产业结构的变化而发生着剧烈的变化。本文研究了产业结构变化对城市边缘区土地资源利用影响的规律及原因，并以海淀区为例详细分折了其产业结构变化及对土地赛场利用的影响，结合产业结构的变化趋势分折预测了海淀区将来土地资源利用的变化。  相似文献   

湖南鹿井铀矿田黄高地区成矿断裂构造地球化学特征及找矿意义     

覃金宁  刘红兵  何春明  费天伟  颜晓莲 《华东地质学院学报》2003,26(3):254-258

从构造地球化学找矿角度出发,在研究地质构造背景、断裂构造特征的基础上,阐述了成矿断裂构造地球化学特征,并对区内铀成矿前景作了探讨。初步认为有利铀矿赋存的构造组合形式是多尺度的似菱形构造圈围和双断裂构造夹持区。在其控制范围内,断裂构造带上部或地表具有As,W,Sn,Sb前缘元素异常,Zn/Mo≤14,Pb·Mo/Zn·U=n×10-2,Cu·Zn/Pb·Mo≤20,Zn/Pb≤1.4,放射性地球化学场Th/U≤2,Fu>2×10-6,γ能谱铀晕值高,规模大,且有γ能谱异常点、带产出,U-230Th-210Po型组合异常发育等重要的成矿断裂构造地球化学特征。  相似文献   

大功率直流激电法在铅锌矿上的应用          下载免费PDF全文

赵晓平  俞有峰 《甘肃地质》2003,12(2):93-96

在低极化率的铅锌矿区,利用大功率激电法,有效地抑制低背景场区的干扰,提高信噪比,取得了良好的找矿效果。  相似文献   

利用测井曲线进行高陂区主采煤层对比   总被引：1，自引：0，他引：1  

柯仙烂 《中国煤田地质》2003,15(6):71-72

选择常规数字测井中采用的视电阻率、人工放射性、自然放射性三种测井曲线,进行高陂区童子岩组第三段中亚段13、18、19、23等四层煤层进行对比,结果表明利用测井曲线连续性中的突变性和突变组合性规律进行对比,效果显著。  相似文献   

In situ X-ray observations of phase transitions in MgAl<Subscript>2</Subscript>O<Subscript>4</Subscript> spinel to 40 GPa using multianvil apparatus with sintered diamond anvils     

T. Irifune  H. Naka  T. Sanehira  T. Inoue  K. Funakoshi 《Physics and Chemistry of Minerals》2002,29(10):645-654

 Phase transitions in MgAl₂O₄ spinel have been studied at pressures 22–38 GPa, and at temperatures up to 1600 °C, using a combination of synchrotron radiation and a multianvil apparatus with sintered diamond anvils. Spinel dissociated into a mixture of MgO plus Al₂O₃ at pressures to 25 GPa, while it transformed to the CaFe₂O₄ (calcium ferrite) structure at higher pressures via the metastably formed oxide mixture upon increasing temperature. Neither the e-phase nor the CaTi₂O₄-type MgAl₂O₄, which were reported in earlier studies using the diamond-anvil cell, were observed in the present pressure and temperature range. The zero-pressure bulk modulus of the calcium-ferrite-type MgAl₂O₄ was calculated as K=213 (3) GPa, which is significantly lower than that reported by Yutani et al. (1997), but is consistent with a more recent result by Funamori et al. (1998) and that estimated by an ab initio calculation by Catti (2001). Received: 2 April 2002 / Accepted: 29 July 2002 Acknowledgements The authors thank Y. Higo, Y. Sueda, T.␣Ueda, Y. Tanimoto, A. Fukuyama, K. Ochi, F. Kurio and T. Kawahara for help in the in situ X-ray observations at SPring-8 (No: 2000A0061-CD-np and 2000B0093-ND-np). We also thank W.␣Utsumi, J. Ando and O. Shimomura for advice and encouragement during this study, and N. Funamori and an anonymous reviwer for comments on the article. The present study is partly supported by the grant-in-aid for Scientific Research (A) of the Ministry of Education, Science, Sport and Culture of the Japanese government (no: 11694088).  相似文献   

芦芽山生态旅游资源及生态旅游区划   总被引：14，自引：0，他引：14  

程占红  张金屯  上官铁梁 《山地学报》2002,20(3):375-379

生态旅游结合自然保护区的发展赋予了新的机遇，但同时又使它面临着严峻挑战。加强旅游规划分区研究非常必要。芦芽山具有丰富的生态旅游资源。地貌形态多样，生物资源异常丰富，气候、植被－－土壤呈明显垂直变化。结合其旅游资源，我们对其分区如下；河谷和沟谷农田乡村区－－接近自然的生态旅游；落叶阔叶林区－－亲近自然的生态旅游；针阔叶混交林枢－－返回自然的生态旅游；寒温性针叶林和亚高山灌丛草甸区－－回归大自然的生态旅游。  相似文献   

Development of an apparatus to measure groundwater qualities in situ and to sample groundwater using boreholes     

H. Ii  Yoshihiro Horie  Takashi Ishii  Jun Shimada 《Environmental Geology》1997,32(1):17-22

 To accurately measure the pH, Eh, EC and temperature of groundwater retrieved from boreholes, a deep groundwater sampling apparatus was developed which provided sensory measurements both in situ and in a flow-through cell at ground level. Under a pressure of 1×10⁶ Pa the in situ accuracy of the apparatus sensor was within the following limits: pH ±0.2, temperature ±0.1°C, Eh ±10 mV, and EC ±2.4%. The measuring and sampling of deep groundwater from a borehole of more than 1000 m in depth was performed continuously for 30 days. Values of pH were the same for the in situ sensor, the flow-through cell sensor and the laboratory measurements of the sampled water. At the beginning of the sampling period, Eh values of the in situ sensor indicated deep groundwater conditions. The apparatus is particularly useful for Eh measurement. Chemical composition and stable isotope ratios indicated that the groundwater sampled from more than 1000 m depth was a connate water with a chemical composition slightly different from seawater of the present time, and the groundwater retrieved from 800 m depth was a meteoric water. Natural radioactive elements are thought to be the origin of the tritium in the groundwater retrieved from the 1000 m depth. Received: 6 August 1996 / Accepted: 22 October 1996  相似文献   

吉林省新生代火山分布特征   总被引：1，自引：0，他引：1  

张成梁 《吉林地质》1997,16(2):44-50

吉林省新生代火山分布，自西向东呈现出数量及面积逐渐增加、形太民及排列方式逐渐多样，喷发规模逐渐增大，喷发强度逐渐加强、喷发类型逐渐复杂、形成时代逐渐变等等特征，且有同源岩浆演化的连续性和继承性，并表现出由碱性橄榄玄武岩－拉斑玄武岩－粗面岩－碱流岩的演化系列。  相似文献   

新新矿区山西组植物古生态学研究   总被引：1，自引：0，他引：1  

王军  孙柏年 《煤田地质与勘探》1996,24(5):12-15

对登封煤田新新矿区早二叠世中期山西组植物古生态进行了初步研究，讨论了植物群落的演替、结构，以及含煤地层的古地理环境  相似文献