Study on pollution for the photoelectronic material InP

The mass spectrum analysis of crystal face (100) and (111) and the photoluminescence analysis of crystal face (100) in the photoelectronic material InP were given. The Hall coefficient, charge carrier concentration and Hall mobility were determined. Experimental results indicate that the pollution of silicon is predominant

Cu isotopic compositions in Elsholtzia splendens: Influence of soil condition and growth period on Cu isotopic fractionation in plant tissue

This study investigates the magnitude and direction of Cu isotopic fractionation in the Cu-tolerant, strategy I plant, Elsholtzia splendens, considering the effect of soil condition and plant growth cycle. Uptake of Cu by E. splendens from soil was found to favor light Cu isotopic enrichment (delta Cu-65 < 0 parts per thousand) due to reduction at the soil root interface. The magnitude of fractionation between soil and plant was found to be dependent on free Cu ion species in soil solution correlated with pH value of soil other than the phytoavailable component of soil or total soil for the same parent soil

中国大陆主要变形系统/Major deformation systems in the Mainland of China[J]

地壳中的构造变形是已有岩石在地质应力作用下发生结构构造和空间位置变化的产物,因而是资源勘查开发和地质灾害防治不可忽视的重要地质现象.然而,地壳中的构造变形能否像岩石及岩石组合一样,也可以为一个地区的地质历史重建提供约束,在已有文献中没有系统的论述.文中针对这一问题,在系统研究了全球不同地球动力学环境构造变形特征的基础上,提出了变形系统的概念,将其定义为在一定区域范围内、同一地球动力学背景下同时形成的、具有不同几何学和运动学特征的各种构造变形的集合,并根据其产出的地球动力学环境,将其划分为11种类型.基于这一认识,在系统收集研究了中国大陆已有构造变形资料的基础上,简要介绍了中国大陆古生代以来的14个变形系统,探讨了中国大陆构造分区和构造演化的几个问题.根据与全球典型变形系统的对比,基于中国大陆古生代以来主要变形系统的时空分布,笔者提出:(1)中国东部新生代伸展变形系统的成因主要与澳大利亚板块向北运动有关;(2)中国东部海域可能隐伏有中生代晚期弧陆碰撞带;(3)中国东部白垩纪地球动力学环境可能类似于现今北美西部科迪勒拉型大陆边缘;(4)秦岭山脉南北两侧晚侏罗世至早白垩世挤压构造变形可能是蒙古鄂霍茨克造山带陆缘碰撞的远程响应;(5)敦煌-阿拉善地块在早古生代期间是中国大陆独立的第四大古陆块体;(6)西准噶尔和西天山北部属于哈萨克斯坦古板块北部增生边缘,准噶尔吐哈盆地基底及其以北的东准噶尔和阿尔泰山属于西伯利亚古板块古生代增生边缘;(7)小兴安岭和张广才岭东侧的原黑龙江群是大兴安岭地区西伯利亚古陆古生代增生边缘的向东延伸,不是侏罗纪增生杂岩或早古生代碰撞带的残片;(8)中国北方及邻区古生代至中生代期间经历了多次碰撞造山.中国大陆古生代以来变形系统的初步研究,表明变形系统的研究可以为大陆构造单元划分、构造演化和古地球动力学环境的重建提供重要的约束

Potential exposure of perfluorinated compounds to Chinese in Shenyang and Yangtze River Delta areas

A total of 21 perfluorinated compounds (PFCs) were quantified in water and biota samples collected from Shenyang in North-east China and the Yangtze River Delta area in East China. The human health risk owing to intake of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) via fish and domestic poultry dietary was evaluated. The total PFC concentration (Sigma PFC) in water samples from the rivers in Shenyang averaged 5.32 ng L(-1), with PFOS and PFOA as the predominant compounds. The urban sewage could be the source of PFOS and perfluorohexane sulfonate (PFHxS) in the surface waters. The total PFCs in water samples from the Yangtze River Delta area ranged from 42.4 to 170 ng L(-1). The highest concentrations of most PFCs were observed in waters from the Shanghai section of the Yangtze River. In the biota samples, PFOS and PFUnDA (perfluoroundecanoic acid) were the most abundant. The acceptable daily intake (ADI) and hazard ratio (HR) values for PFOS and PFOA intake through the diet of fish and poultry in the studied areas were calculated, and showed that the HR values for PFOS and PFOA are all less than 1.0 for both the areas

Tunable ultra-narrow band-gap of anomalous dispersion photonic crystals

We use the transfer-matrix method to research the band structures in one-dimensional photonic crystals composed of anomalous dispersion material ( saturated atomic cesium vapor). Our calculations show that that type of photonic crystal possesses an ultra-narrow photonic band gap and this band gap is tunable when altering the electron population in the atomic ground state of the anomalous dispersion material by the optical pumping method. Copyright (C) EPLA, 2007

新疆可可托海3号伟晶岩脉成岩时代的限定:来自辉钼矿Re-Os定年的证据/New age constraints on Koktokay pegmatite No.3 Vein, Altay Mountains, Xinjiang: Evidence from molybdenite Re-Os dating[J]

可可托海3号伟晶岩脉因其完美的岩浆结晶分异特征而闻名世界,但针对其年代学方面的认识仍存在较大分歧.本次工作采集到产于3号脉边部带中的6件辉钼矿样品.其产出地质特征显示属于3号伟晶岩脉边部带形成时与围岩的热液交代成因,形成时间应与边部带近于同时或稍晚.文章利用辉钼矿Re-Os测年技术进行的年代学研究结果表明,6件辉钼矿Re-Os等时线年龄为(208.8±2.4) Ma(MSWD=0.89)以及模式年龄为(209.9±1.3) Ma(MSWD=0.69),在误差范围内一致,可忽略辉钼矿Re-Os体系可能产生的失偶现象,代表了辉钼矿在流体中沉淀的时间.在研究前人年代学成果基础上,笔者认为3号伟晶岩脉的形成起始于209Ma左右,即中三叠世晚期

新疆吐鲁番-哈密盆地北部下二叠统伊尔稀土组的沉积征与盆地演化/Sedimentology and basin evolution of the Early Permian Yierxitu Formation in Turpan-Hami area, Xinjiang[J]

吐鲁番-哈密盆地北部广泛分布下二叠统伊尔稀土组,记录了盆地形成时期的古气候、古地理、盆地演化及大地构造背景方面的许多重要信息.针对伊尔稀土组的沉积特征、盆地属性和大地构造背景研究中存在的若干争议问题,在前人研究的基础上,通过盆地分析方法,研究了早二叠世的盆地演化规律和大地构造背景.研究表明,伊尔稀土组垂向上经历了河流/冲积扇-滨浅湖-半深湖/深湖的沉积环境变化,其火山岩建造以含橄榄玄武岩、玄武安山岩及流纹岩的双峰式火山岩组合为特征,且岩石组合的展布显示火山岩比例自西向东逐渐增多,说明东部火山活动较西部强烈.同时期博格达北麓发育海相复理石建造夹少量火山岩.岩石学特征及地球化学分析显示,博格达北麓的早二叠世火山岩组合也具有双峰式特征,说明二叠纪早期博格达北麓为海相裂谷环境,博格达南麓为陆相裂谷环境.古流向呈现双向性,自博格达南北向裂谷中心汇聚.物源分析显示,吐哈盆地北缘早、中二叠世地层中的砾石成分多以安山岩与凝灰岩、流纹质等酸性火山岩为主,砂岩、硅质岩、灰岩次之,主要来自于下伏泥盆纪、石炭纪岩石

新疆准噶尔北缘乔夏哈拉铁铜金矿床成岩成矿时代/Rock-forming and ore-forming ages of Qiaoxiahala Fe-Cu-Au deposit on northern margin of Junggar Basin, Xinjiang[J]

乔夏哈拉铁铜金矿位于新疆准噶尔北缘,矿体赋存于中泥盆统北塔山组第三岩性段凝灰质砂岩、粉砂岩、大理岩、凝灰岩、玄武岩及安山岩中.铁矿体呈似层状、扁豆状或透镜状,铜金矿体产于铁矿体内及铁矿体下盘的绿帘石蚀变岩中,空间上与矿区广泛出露的闪长玢岩密切相关.对矿区闪长玢岩中锆石LA- ICP-MS U-Pb年龄及绿帘石磁铁矿矿石、黄铜矿磁铁矿矿石中辉钼矿Re-Os年龄进行了研究,闪长玢岩的206pb/238U加权平均年龄为(377.6±1.4) Ma(MSDW=0.20),4件样品的Re-Os同位素模式年龄为(377.7±5.9)～(383.1±5.4) Ma,加权平均值为(380.1±2.7) Ma(MSDW=0.66),等时线年龄为(377.4±4.3) Ma(MSDW=0.36),表明乔夏哈拉铁铜金矿成矿时代与闪长玢岩侵入时代一致,均为中泥盆世晚期,矿床的形成与闪长玢岩有成因关系.辉钼矿样品的w(Re)为383.1～1928μg/g,指示成矿物质主要来源于地幔,可能有地壳物质的加入

哈萨克斯坦阿克斗卡特大型斑岩铜矿床成矿时代与剥露历史研究/Metallogenic Age of the Super-Large Aktogai Porphyry Copper Deposit,Kazakhstan, and Its Exhumation History[J]

哈萨克斯坦阿克斗卡特大型斑岩型铜矿床产在中亚成矿域巴尔喀什成矿带阿克斗卡矿田.本文根据花岗岩类岩石的锆石U-Pb、40Ar/39 Ar和裂变径迹(FT)热年代学研究,结合前人研究成果,给出了阿克斗卡斑岩铜矿床从深成岩浆活动、成矿作用、区域冷却到剥露作用的全过程.阿克斗卡矿床及附近花岗岩类锆石SHRIMPU-Pb定年结果,给出科尔达尔岩体早期英云闪长岩的结晶年龄为335.7士1.3 Ma;主成矿期的含矿二长花岗斑岩结晶年龄为327.5±1.9 Ma,反映了阿克斗卡矿床斑岩型铜成矿作用的年龄.花岗岩类角闪石、黑云母、钾长石40Ar/39Ar热年代学分别给出矿物冷却年龄为310.6 Ma、271.5 Ma和274.9 Ma,进一步限定了深成斑岩型铜成矿作用的时代和区域冷却的历史.磷灰石FT测年数据揭示,受区域构造作用的影响,阿克斗卡铜矿田在晚白垩世(91～68.0 Ma)发生地块的差异隆升和剥露作用