四川万州中侏罗统上沙溪庙组粘土岩中火山灰的岩矿和地球化学证据   总被引：2，自引：0，他引：2  

张超  马昌前  佘振兵  殷坤龙 《高校地质学报》2005,11(3):415-424

四川盆地东北缘万州地区中侏罗世上沙溪庙组产出稳定层状浅色粘土岩。利用X射线、X荧光光谱、等离子光谱（ICP）等方法对矿物成分、常量、微量和稀土元素进行了测试分析,粘土岩主要矿物为蒙脱石、伊利石和绿泥石。通过与澳大利亚后太古代平均页岩（PAAS）、北美平均页岩（NASC）、地壳粘土岩背景值以及其它具有代表性岩石的对比发现,本区粘土岩微量元素具有明显的低V,低Ti和低铁族元素的特点,高Al2O3／TiO2比值和低Ti／Th比值特征显著,某些层位具有明显的Eu负异常。推断本区粘土岩沉积物源具有火山灰和陆源碎屑的二元混合成因,各层位成分的差异显示了不同沉积时间内二者的混合比例发生变化。区域对比和地球化学资料显示火山灰可能来自于西部600km远的特提斯洋岛弧火山。  相似文献   

Utilization of Lime for Stabilizing Soft Clay Soil of High Organic Content     

Mohamed A. Sakr  Mohamed A. Shahin  Yasser M. Metwally 《Geotechnical and Geological Engineering》2009,27(1):105-113

This paper presents the results of geotechnical and mineralogical investigations on lime-treated soft clay soil from Idku City, Egypt, where high organic matters of about 14% exist. Lime was added in the order of 1%, 3%, 5% and 7% by weight and laboratory experiments after 7, 15, 30 and 60 days were conducted including the mineralogical and microstructural examinations, grain size analysis, plasticity limits, unconfined compressive tests, vane shear tests and oedometer tests. The results indicate that soft clay soil of high organic content of 14% can be stabilized satisfactorily with the addition of 7% lime. The results also demonstrate that the changes in the mineralogical contents and soil fabric of high organic lime-treated soft clay improve soil plasticity, strength and compressibility.  相似文献   

昆仑山北坡岛状冻土区西大滩大型饮用矿泉群成因分析   总被引：1，自引：0，他引：1  

张森琦  范基姣  吴宏涛  蒋凡  谭立渭  郭宏业  李颖志 《冰川冻土》2009,31(5)

在对昆仑山北坡岛状冻土区西大滩大型饮用矿泉群水文地质、导水与控水断裂、水化学等方面实地调查和EH-4高频、电测深勘探的基础上,认为矿泉群的补给源为昆仑山玉珠峰一带的现代冰川底部冰雪覆盖融区水、冰雪消融水、大气降水和地表水.补给源水通过具多期活动性的F3和F4正断层组破碎带补给深层地下水.深层地下水在西倾近南北向正断层组F2及F2-1,2的导水断层破碎带富集并继续向北径流,径流至F1南倾活动性逆断层上盘时,形成富水"三角区",并沿F1断层破碎带排泄出地表,是西大滩大型饮用矿泉群形成的主因.  相似文献   

苏纪石的矿物组成与鉴定特征研究     

汪洋  况守英  王士元  王玉山 《地质科学译丛》2009,(2):30-33

苏纪石是目前珠宝市场上的一种新兴宝玉石材料,主要通过颜色特征以及经验来鉴别,其宝石矿物学研究尚属空白。采用偏光显微镜、傅里叶变换红外光谱仪、电子探针及X射线粉末衍射仪对苏纪石样品的矿物组成、化学成分、红外光谱及XRD特征图谱进行了测试研究。结果显示,苏纪石样品的主要矿物组成为硅铁锂钠石与石英,分布有少量的长石、绿泥石和褐铁矿等;其中,硅铁锂钠石呈板条状或隐晶质集合体,石英呈等轴他形微粒状或不规则团块状、条带状;硅铁锂钠石的化学分子式为K0.94Na2.85Li2.49（Fe1.59^3＋Mg1.82）3.41Al0．22Ca0.26[Si11.02O30.00]H2O,其IR特征峰为455,507,588,053,694,777,797,1042,1123cm^-1,其主要的XRD谱线为4．323（100）,4．063（57）,3．197（81）,2．863（51）;硅铁锂钠石中MnO的质量分数直接影响了苏纪石颜色的深浅,其IR,XRD特征图谱是鉴定苏纪石的重要特征之一。  相似文献   

Characterization of an Area Polluted by Copper and Zinc:the Relation between Soil Texture,Mineralogy and Pollutant Concentration     

Caterina RINAUDO  Daniela GASTALDI  Orfeo ZERBINATI  Elisa FORNERO  Graziella BERTA 《《地质学报》英文版》2009,83(6):1224-1231

Abstract: Twenty-four soil samples were collected at three depths from an approximately 2.5 acre contaminated site in southern Piedmont (Italy) and then analyzed. The main soil parameters determined were: pH, Cation Exchange Capacity (CEC), particle size distribution, total organic carbon (TOC) content and retained metal concentration. The mineral phases were identified by X-Ray Powder Diffraction (XRPD). All of the samples contained Zn and Cu resulting from industrial contamination during the last century, and those obtained at depths of 20-40 cm consistently showed the highest levels. To determine which size fraction was most active in the retention process, the samples were separated into four fractions (≤2 mm, ≤63 μm, ≤30 μm and ≤2 μm) and the amount of pollutant measured in each. It was found that metal retention was the highest in the clayey fraction, whose clay minerals were identified by XRPD after K+ and Mg2+ saturation, glycerol treatment and heating to 550°C. The clayey fraction was also the richest in TOC, and a direct correlation between TOC amount and metal retention was observed.  相似文献   

浅谈安图县长白山优质矿泉水资源     

卢秉龙  杨柯明 《吉林地质》2009,28(1):77-79

安图县是吉林省大型矿泉水基地之一,天然矿泉水资源丰富,矿泉水资源的勘查、开发和保护是当前面临的主要问题。本文在介绍了资源概况基础上,对勘查、保护和开发现状进行了调查分析,提出了勘查、保护和开发建议,对安图县矿泉水资源勘查、保护和开发具有指导意义。  相似文献   

中国周边国家金属矿产资源调查与合作潜力分析   总被引：2，自引：0，他引：2  

张鸿翔 《地球科学进展》2009,24(10):1159-1172

中国是矿产资源大国,种类齐全,总量较大,但优势金属矿种多为一般矿产,主要战略性矿产的储量严重偏低,研究中国周边国家资源的供给能力与合作潜力分析对我国经济可持续发展意义重大.  相似文献   

如何开展老矿山后备资源的寻找与定位预测--工作程序与实例分析   总被引：4，自引：4，他引：0  

刘红涛  杨秀瑛  刘建明  曾庆栋  于昌明  叶杰 《地球物理学进展》2004,19(3):573-582

在老矿山的深部与外围寻找新的可用资源,要求勘探者具备新的找矿思路、行之有效的深部探测手段与合理的工作程序、新的找矿思路来自于研究者的相关知识储备和创新能力,使其不墨守成规,用新的视角重新认识矿化规律和控矿要素。进而在老矿区优选出潜在的有利成矿区段．行之有效的深部探测手段以其高分辨的数字图像,不仅可以客观地反映深部地质结构的各种变化及矿化信息,以验证地质推测的可靠性,而且借助属地化的解释模型对矿区深部和外围开展真正意义的矿体定位预测、同时还可以大大降低工程验证的盲目性和巨大浪费．根据我们目前拥有的先进地球物理深部探测手段和大量老矿山找矿的经验与教训,逐渐形成了一套实用的工作程序。  相似文献   

改性黏土对褐潮生物种Aureococcus anophagefferens的去除研究   总被引：1，自引：1，他引：0  

张雅琪  俞志明  宋秀贤  曹西华  刘扬 《海洋学报》2013,35(3):197-203

褐潮是一种由微微型藻引发的藻华,已连续4年在渤海海域暴发,给当地带来巨大的经济损失。目前,在褐潮尚不能有效预防、预控情况下,如何控制和减少其对生态环境和沿海经济带来的危害,成为一个急需解决的问题。利用改性黏土消除藻华是一种快速有效、并得以多次现场成功应用的方法。考察比较了多种不同产地、不同类型的黏土及其改性后对褐潮生物种Aureococcus anophagef ferens(抑食金球藻)的去除效果,选取5种典型的黏土作为主要的实验材料,开展了不同条件下黏土及其改性后对A. anophagef ferens去除效率的影响研究。实验发现,因A. anophagef ferens个体微小、藻华时密度大,相同用量的黏土或改性黏土对其去除效率低于常见的硅藻、甲藻生物;不同类型黏土对其去除效率有影响,高岭土的去除效率高于蒙脱土;而黏土改性后对A. anophagef ferens的去除效率提高3倍以上。在此基础上,还考察分析了黏土粒径、分散介质等因素对A. anophagef ferens去除效率的影响,为进一步研发安全、高效的褐潮应急消除材料做了有益探索。  相似文献   

Enhancing the mechanical properties of marine clay using cement solidification     

Bhim Kumar Dahal  Rong-Jun Zhang  Ding-Bao Song 《Marine Georesources & Geotechnology》2013,31(6):755-764

Abstract

The use of soft clay and dredged marine clays as the construction material is challenging. This is because the high water content, high compressibility and low permeability of the clay causing the instability of ground and structure. This detrimental effect of soft clay can be improved by the cement solidification process, which is relatively cheap and efficient. This paper mainly focuses on the study of improvement on the mechanical behavior of cement mixed marine clay. The soil is reconstituted by using ordinary Portland cement of 5%, 10%, 15% and 20% by its mass. The study reveals that cementation of clay significantly improves the peak and residual strength of soil. Similarly, the primary yield stress of the soil is also improved from 16 to 275?kPa as cement content increases from 5% to 20%, respectively. By using statistical tools, the relationships between various parameters are established, which are very important to define the mechanical behavior of the clay. This study reveals that the yield surface of the solidified marine clay is not a smooth elliptical surface. Rather it is composed of two linear surfaces followed by a log-linear surface which can be modeled by using simple parameters obtained from triaxial tests.  相似文献