河南产宝石级高温高压合成钻石的谱学特征及电磁性研究     

杨池玉  陆太进  张健  宋中华  陈华  柯捷  何明跃 《岩矿测试》2021,(2):217-226

为快速鉴定高温高压(HPHT)合成钻石,前人已开展了系统的发光特征和谱学特征研究,但对比性分析较少,且对电学性质和磁学性质关注不多。本文结合常规宝石学观察、高精度谱学测试以及导电性和磁性测试,对49粒无色、黄色样品进行了深入研究和对比分析。结果表明:①铁、钴、镍等金属元素的触媒残余是HPHT合成钻石的磁性来源,测试样品均能被磁强达到12000Gs的磁棒吸引。②无色HPHT合成钻石为Ⅱa+Ⅱb型钻石,硼元素的存在导致其具有良好的导电能力,且随着硼含量的增多,导电能力逐渐增强;黄色样品为Ⅰb+ⅠaA型钻石,约三分之一的孤氮转化为A集合体,揭示合成钻石在生长完成后经过了高温退火处理。③硼元素的普遍存在,以及氮元素主要以孤氮原子和A集合体的方式存在,导致了HPHT合成钻石的特征红外光谱;HPHT合成钻石中常含有氮、镍、硅等杂质元素引起的晶格缺陷,导致了特征的光致发光光谱。④无色HPHT合成钻石具有强蓝绿色荧光和磷光,黄色HPHT合成钻石具有绿色荧光,可见明显的立方体-八面体分区现象。本研究表明:谱学特征和发光特征仍然是筛查鉴定HPHT合成钻石的重要依据。现生长技术下合成的HPHT合成钻石在导电性和磁性两方面也与天然钻石存在明显差异,可以作为快速鉴定合成钻石的辅助性依据。  相似文献   

甘肃北山1∶5万前红泉等三幅矿产远景调查新进展          下载免费PDF全文

赵吉昌  杨镇熙  陈晔  惠剑宁  樊新祥 《地质找矿论丛》2021,36(3):366-372

为查明甘肃北山前红泉一带地层、岩浆岩、构造等地质特征和成矿地质条件,总结成矿规律,进行矿产资源远景评价和成矿预测,开展了1∶5万前红泉等三幅矿产远景调查工作。通过4个年度工作,重新厘定了工作区地层系统,建立了区内岩浆岩演化序列,在构造解析的基础上探讨区域构造演化史。将"O-S"地层(敦煌岩群)解体为4个填图单元,首次发现了黑山头埃达克岩,新发现各类矿产地、矿(化)点17处。通过综合研究,圈定6处找矿远景区和10处找矿靶区;对北山地区"O-S"地层(敦煌岩群)进行了重新认识,对北山韧性剪切带金矿找矿前景及钴矿找矿方向等提出了思考和展望。  相似文献   

Elastic fields in two joined transversely isotropic media of infinite extent as a result of rectangular loading     

H. T. Xiao  Z. Q. Yue 《国际地质力学数值与分析法杂志》2013,37(3):247-277

This paper presents the closed‐form solutions for the elastic fields in two bonded rocks induced by rectangular loadings. Each of the two bonded rocks behaves as a transversely isotropic linear elastic solid of semi‐infinite extent. They are completely bonded together at a horizontal surface. The rectangular loadings are body forces along either vertical or horizontal directions and are uniformly applied on a rectangular area. The rectangular area is embedded in the two bonded rocks and is parallel to the horizontal interface. The classical integral transforms are used in the solution formulation, and the elastic solutions are expressed in the forms of elementary harmonic functions for the rectangular loadings. The stresses and displacements in the rocks induced by both the horizontal and vertical body forces are also presented. The numerical results illustrate the important effect of the anisotropic bimaterial properties on the stress and displacement fields. The solutions can be easily implemented for numerical calculations and applied to problems encountered in rock mechanics and engineering. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

Analytic element modelling for strip aquifers     

José Anderson N. Batista  Edson Wendland  Harry E. Schulz 《水文研究》2012,26(8):1254-1262

The Analytic Element Method (AEM) provides a convenient tool for groundwater flow analysis in unbounded continuous domains. The AEM is based on the superposition of analytic functions, known as elements, useful at both regional and local scales. In this study, analytic elements for strip aquifers are presented. Such aquifers occur in riverine or coastal deposits and in outcrop zones of confined aquifers. Local flow field is modelled indirectly, using a reference plane related to the aquifer domain through the Schwarz‐Christoffel transform. The regional flow is obtained as a solution of the one‐dimensional flow equation. The proposed methodology was tested by modelling two hypothetical situations, which were compared to exact solutions. It is shown that regional boundaries can be reproduced exactly while local fields are adequately reproduced with analytic elements. The developed elements are applied to simulate a real flow field in northeastern Brazil showing good agreement with measured water levels. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

EVALUATION OF DAILY PRECIPITATION IN CHINA FROM ECMWF AND NCEP REANALYSES   总被引：2，自引：0，他引：2  

崔茂常  冯明  练树民 《中国海洋湖沼学报》2000,18(1):35-41

ＩＮＴＲＯＤＵＣＴＩＯＮＷｅａｔｈｅｒｆｏｒｅｃａｓｔｉｎｇａｓａｍａｊｏｒｓｕｂｊｅｃｔｉｎａｔｍｏｓｐｈｅｒｉｃｓｃｉｅｎｃｅｈａｓｄｅｖｅｌｏｐｅｄｓｉｎｃｅｔｈｅ 1 950’ｓｉｎｔｏａｍｏｄｅｒｎｓｃｉｅｎｃｅ .Ｎｕｍｅｒｉｃａｌｗｅａｔｈｅｒｆｏｒｅｃａｓｔｍｏｄｅｌｓａｒｅｅｘｔｅｎｓｉｖｅｌｙａｎｄｆｒｅｑｕｅｎｔｌｙｕｓｅｄｔｏｃｈｅｃｋｔｈｅｔｈｅｏｒｉｅｓ,ｒｕｌｅｏｕｔｔｈｅｏｌｄｉｎｃｏｒｒｅｃｔｏｎｅｓａｎｄｐｒｅｓｅｎｔｎｅｗｉｄｅａｓ,ａｎｄｓｕｇｇｅｓｔｍｅｔｈｏｄｓ…  相似文献   

The Fourier Integral Method: An efficient spectral method for simulation of random fields   总被引：4，自引：0，他引：4  

E. Pardo-Igúzquiza  M. Chica-Olmo 《Mathematical Geology》1993,25(2):177-217

The Fourier Integral Method (FIM) of spectral simulation, adapted to generate realizations of a random function in one, two, or three dimensions, is shown to be an efficient technique of non-conditional geostatistical simulation. The main contribution is the use of the fast Fourier transform for both numerical calculus of the density spectral function and as generator of random finite multidimensional sequences with imposed covariance. Results obtained with the FIM are compared with those obtained by other classic methods: Shinozuka and Jan Method in 1D and Turning Bands Method in 2D and 3D, the points for and against different methodologies are discussed. Moreover, with the FIM the simulation of nested structures, one of which can be a nugget effect and the simulation of both zonal and geometric anisotropy is straightforward. All steps taken to implement the FIM methodology are discussed.  相似文献   

Detection of anomalous seismic phases by the wavelet transform   总被引：1，自引：0，他引：1  

Kiyoshi Yomogida 《Geophysical Journal International》1994,116(1):119-130

  相似文献   

黄山东镁铁超镁铁杂岩中的辉石化学成分研究   总被引：7，自引：0，他引：7  

倪志耀 《岩石矿物学杂志》1994,13(1):55-66

通过对黄山东镁铁超镁铁杂岩的辉石化学成分研究，证明辉石的化学成分受寄主岩石类型的制约，从超镁铁岩相到角闪辉长岩相斜方辉石的化学成分由富ＭｇＯ、ＳｉＯ＿２、Ａｌ＿２Ｏ＿３、Ｃｒ＿２Ｏ＿３到富ＦｅＯ、ＴｉＯ＿２、ＣａＯ、ＭｎＯ；单斜辉石化学成分由富Ａｌ＿２Ｏ＿３、Ｃｒ＿２Ｏ＿３、Ｎａ＿２Ｏ、ＭｇＯ到富ＦｅＯ、ＭｎＯ、ＣｏＯ。在同一寄主岩石中，单斜辉石比斜方辉石富ＴｉＯ＿２、Ａｌ＿２Ｏ＿３、Ｃｒ＿２Ｏ＿３、ＣａＯ和Ｎａ＿２Ｏ，贫ＭｇＯ、ＳｉＯ＿２、ＭｎＯ和ＦｅＯ。根据辉石化学成分特征得出黄山东杂岩形成于岛弧环境，为上地幔石榴二辉檄榄岩部分熔融形成的拉斑玄武岩岩浆结晶分异作用的产物。  相似文献   

湖北黄石地区的滑脱构造及其对煤层的控制   总被引：1，自引：0，他引：1  

樊光明  朱定龙 《中国煤田地质》1994,6(3):9-15,33

研究表明，黄石地区发育了一套滑脱构造。宏观及微观构造显示其运移滑动方向是自南向北的，它是江南隆起中段九岭幕阜山隆起北侧巨型滑脱系统的前缘滑脱挤压带。本文从几何学、运动学和动力学几方面论述和分析了该滑脱构造的特征和形成过程，并总结了本区滑脱构造的样式及其控煤型式。  相似文献   

台湾岛对气流扰动的影响          下载免费PDF全文

端义宏  刘秦玉 《地球物理学报》1993,36(3):287-296

本文根据一个三维气流过山的模型,用数值快速傅里叶变换方法,讨论理想东北季风气流经过台湾岛产生的扰动气压场、扰动垂直速度场和水平流场.经与实际东北季风下台湾岛的气候特征进行比较,结果令人满意.  相似文献