甘肃白银厂矿田流纹岩的成因及其构造意义

白银厂矿田早-中寒武世流纹岩被认为是大陆裂谷环境或洋内弧岩浆作用的产物。地球化学分析结果显示：流纹岩具有Ti,Nb,Ta明显负异常,Sr和P中等负异常,LREE略富集到富集,相对亏损HFSE,La／Nb值为1～2,La/Th值为1.1～2.5,Th/Ta值高（6～12）,部分样品表现为MREE负异常的稀土元素配分特征 ,δu=0.5～1.1,(^87Sr/^86Sr)t=0.7026～0.7048,ENd(t)= 5.60～ 6.14,综合其地球化学特征,推测流纹岩形成应是在大陆地壳基础上,由于与俯冲作用有关的玄武岩浆底侵作用导致镁铁质下地壳发生部分熔融所致。     

基性麻粒岩半脆性域剪切带形成机制的实验研究

在温度为８００～９００℃，围压为１ＧＰａ的条件下对基性麻粒岩进行了压缩变形实验。样品变形处于半脆性域，以出现非破裂的准韧性剪切带为特征。提出了剪切带是由样品的原始缺陷向外稳态扩展而形成的机制，可用稍加改变的流变介质断裂力学原理对这种扩展过程进行说明；并将此机制推广到剪切带的形成中。     

全球麻粒岩相地体与大陆下地壳成分模型

在出露地表的中、高压相麻粒岩地体代表下陆壳的认识基础上,建成全球麻粒岩相地体地球化学成分数据库（共１６８５套分析数据）。利用ＩＢＭ４３８１大型计算机对全部数据进行了多元变量统计分析,成功地建立了迄今为止精度最高的太古代、后太古代和全球大陆下地壳化学成分模型。     

Water in granulites: implications for the nature and evolution of the lower continental crust

The tower continental crust is one of the most important sphere-layers in the deep earth, and is the direct place where the crust-mantle interactions occur. Granulttes are the dominated rocks in the lower crust, and have critical implications for the knowledge of the composition, nature and evolution of the deep crust; fluids are important mediums influencing many geochemical, geophysical and geodynamical characteristics of the lower crust, and may also play a fundamental role in the petrogenesis of granulites and the formation of the lower crusts. In this paper, we review recent advances involved with the deep continental crust, granulites and fluids, and some longstanding debates. Combined with the Fourier-transform infrared spectroscopy (FTIR) analysis performed on the mineral assemblages (cpx, opx, plag and grt) in lower crustal granulite xenoliths and terrains (exposed section) from east China, it is suggested that structural water, dominated by OH, in these nominally anhydrous phases may constitute the most important water reservoir in the deep crust. This structual water may help to understand many lower crustal geological processes and phenomena (e.g. seismic activities and electrical conductive anomalies), and influences from these water must be taken into consideration.     

Water in granulites: implications for the nature and evolution of the lower continental crust

The lower continental crust is one of the most important sphere-layers in the deep earth, and is the direct place where the crust-mantle interactions occur. Granulites are the dominated rocks in the lower crust, and have critical implications for the knowledge of the composition, nature and evolution of the deep crust; fluids are important mediums influencing many geochemical, geophysical and geodynamical characteristics of the lower crust, and may also play a fundamental role in the petrogenesis of granulites and the formation of the lower crusts. In this paper, we review recent advances involved with the deep continental crust, granulites and fluids, and some long-standing debates. Combined with the Fourier-transform infrared spectroscopy (FTIR) analysis performed on the mineral assemblages (cpx, opx, plag and grt) in lower crustal granulite xenoliths and terrains (exposed section) from east China, it is suggested that structural water, dominated by OH, in these nominally anhydrous phases may constitute the most important water reservoir in the deep crust. This structual water may help to understand many lower crustal geological processes and phenomena (e.g. seismic activities and electrical conductive anomalies), and influences from these water must be taken into consideration.     

长英质麻粒岩流变性质的实验研究

在温度为６５０～９００℃、围压为１１００ΜΡａ和应变率为１０－４～１０－７ｓ－１的条件下，对大陆下地壳组成中的一类重要岩石——长英质麻粒岩进行了流变实验。稳态流动力学参数符合幂函数流动律ε＝Ａｅｘｐ（Ｑｃ／ＲＴ）Δσｎ，其中Ａ＝０．２７ＭＰａ－３ｓ－１，Ｑｃ＝２８８ｋＪ／ｍｏｌ，ｎ＝３．０。该文将其外推到大陆下地壳变形环境下，讨论了下地壳的强度特征     

赤峰四家子盆地张家口组火山岩成因研究

根据最近几年开展的1∶5万区域地质调查获得的新资料,确认了内蒙古四家子盆地晚侏罗世张家口组的存在,并将张家口旋回火山岩划分为三个亚旋回.火山岩岩性为流纹岩类、粗面岩类和粗安岩类.对该地区火山岩的主量元素和微量元素进行了高精度分析测试,结果显示:火山岩具有高SiO2,Al2O3,K2O,Na2O含量和低MgO,TiO2含量的特征;里特曼指数σ(1.19~4.87)均值为2.47,属高钾钙碱性岩石系列.火山岩富集大离子亲石元素K,Rb,Sr,Zr,Ba,Pb,Li等,相容元素Ti,Co,Ni,Cr,V亏损.火山岩稀土总量较高,稀土配分模式呈右倾型,轻稀土分馏作用高于重稀土的分馏作用,总体显示弱负铕...     

Composition of plagioclase in Dabie Early Cretaceous granitoids:influence of fractional crystallization on whole-rock Sr–Ca O correlations

Identifying melts of thickened lower continental crust from high Sr/Y rocks is very important to trace deep crustal processes. Recent studies on Dabie Early Cretaceous granitoids have revealed that melts derived from thickened lower continental crust have higher Sr/CaO ratios and define a high Sr evolution trend compared with normal granitoids. Fractional crystallization of plagioclase can significantly change Sr and CaO contents of melts, but its role in controlling the Sr/CaO ratios of the melts is still unclear. This study gives a direct comparison of plagioclase compositions between normal granitoids and low-Mg adakitic rocks. On the basis of Sr-Ca exchange partition coefficient, discussions on effect of plagioclase crystallization on Sr/CaO ratios of melts show that fractional crystallization of abundant plagioclase cannot significantly change Sr/CaO ratios of granitic melts, which are inherited from their individual initial melts. High Sr/CaO ratios indicate the absence of plagioclase in sources of granitic melts. Therefore, high Sr/CaO correlation can be an important indicator to identify melts derived from thickened lower continental crust.     

Eu(Ⅲ)在泥炭上的吸附行为研究

采用静态法研究了Eu(Ⅲ)在泥炭上的吸附行为.探讨了固液比、离子强度、pH、腐殖酸等因素对吸附的影响,并测定了不同温度下的吸附等温线.实验结果表明,pH对Eu(Ⅲ)吸附过程影响较大;离子强度有一定影响;低pH情况下腐殖酸会促进Eu(Ⅲ)吸附的进行,高pH情况下腐殖酸会抑制吸附的进行;吸附反应的吉布斯自由能变小于零说明吸附过程自发进行;吸附过程符合Freundlich吸附模型.     

江西会昌盆地埃达克质粗面岩年代学、地球化学与成因研究

江西是华南白垩纪红色碎屑沉积岩系最发育的地区之一,且常夹有火山岩层。会昌岽背村一带红色沉积岩系底部的火山岩具有较高Si O2和Al2O3,较低的Mg O,Si O2=59.0%~64.6%(平均61.9%),Al2O3=15.5%~18.9(平均17.7%),Mg O=0.28%~0.92%(平均0.55%);富碱和钠,(Na2O+K2O)=7.19%~10.1%(平均9.70%),Na2O=6.50%~7.70%(平均7.03%),在Si O2-(Na2O+K2O)图解上落入碱性系列粗面岩或粗面英安岩范围;CIPW计算结果显示,标准矿物Ab=57.2%~65.7(平均60.5%),Q=6.07%~14.7%(平均9.95%),小于20%,属粗面岩。稀土总量较低,轻稀土明显富集,重稀土强烈亏损,Eu负异常不明显,∑REE=114×10-6~168×10-6,∑LREE=101×10-6~148×10-6,∑HREE=14.9×10-6~19.6×10-6,∑LREE/∑HREE=6.54~7.52,(La/Yb)N=24.9~34.2(平均27.4),δEu=0.81~1.10(平均0.98%),在稀土曲线图上呈明显的右倾,具高压型粗面岩的特征。较低的Y和Yb含量,较高的Sr含量和Sr/Y比值,Y=8.99×10-6~11.7×10-6(平均10.8×10-6),Yb=0.55×10-6~0.82×10-6(平均0.7×10-6),Sr=329×10-6~836×10-6(平均498×10-6),Sr/Y=36.5~71.8(平均48.2),具有埃达克岩的特征;在不相容元素蛛网图上显示富集大离子亲石元素(Cs,Rb,Ba,K等元素),强烈亏损高场强元素(Ta、Nd),具壳源的特征。较低的(87Sr/86Sr)i值、较高的εNd(t)和较小的TDM2值,(87Sr/86Sr)i=0.7074~0.7082(平均0.7077),εNd(t)=-1.99~-2.60(平均-2.29),TDM2=1 071 Ma~1 120 Ma(平均1094 Ma),具年轻下地壳部分熔融产物的特征。SHRIMP锆石U-Pb测年结果显示,14个分析点的206Pb/238U年龄变化范围为(114~108)Ma,加权平均年龄为(110.7±1.0)Ma,MSWD=0.47,指示地质时代属早白垩世晚期。上述特征显示,会昌岽背村一带红色沉积岩系底部的火山岩为早白垩世晚期加厚地壳背景下年轻下地壳部分熔融形成的埃达克质粗面岩。     

花岗岩暗色微粒包体中的水及其在包体研究中的意义

 通过对广东萝岗、王母等岩体的非均一暗色微粒包体的不同部位进行热重-红外三维分析,发现包体从边缘到中心水的含量逐渐递减,亦即包体边缘的挥发份流体多于中心部位,从一个侧面反映了包体在形成过程中内部温度的差异,由此解释了包体内部出现环带状构造的原因,并据此初步探讨了暗色微粒包体形成温度区间为715-850°C之间。     

Carboniferous adakites and Nb-enriched arc basaltic rocks association in the Alataw Mountains, north Xinjiang： interactions between slab melt and mantle peridotite and implications for crustal growth

Adakites and Nb-enriched arc basaltic rocks (NEABs) in arc setting, which are closely correlated in petrogenesis, have recently been widely followed with interest[1—9]. In general, adakite is derived from partial melting of subducting oceanic crust[1]. When adakitic magma (slab melt) passes through the mantle wedge, the interactions between slab melt and mantle peridotite will occur: slab melt is contaminated by peridotite, meanwhile peridotite is metasomated by slab melt. The NEABs are d…     

基于小波神经网络的装备寿命周期费用估算方法

首先简要介绍了寿命周期费用概念以及进行寿命周期费用估算的意义。其次分析了常用估算方法的优缺点,再次通过介绍小波及小波变换的原理和方法,建立了适用于武器装备研制费用的小波神经网络结构.结合某型装备研制费用,进行了数据仿真。仿真结果表明本文方法是可行的。     

一种基于WBS的嵌入式软件估算方法

为确保嵌入式软件项目能够按照预定成本、进度顺利完成,提出一种基于WBS的嵌入式软件估算方法,并结合具体实例对规模/工作量估算、成本估算、进度估算、关键计算机资源估算和风险估算的内容进行了细致的描述.利用基于WBS的嵌入式软件估算方法进行估算,该结果与以往相类似软件实际结果比较,各项数值的误差均在±10%以内.该方法为有...     

Eu(Ⅲ)在红壤及其实性成分上的吸附动力学及热力学

研究了Eu(Ⅲ)在天然红壤、去氧化铁红壤、去有机质红壤3种红壤上的吸附行为,重点讨论了pH、接触时间、离子强度、温度、腐殖酸等对吸附的影响.在pH＜7时,Eu(Ⅲ)在3种红壤上的吸附受pH及离子强度影响很大,而在pH＞7后,影响相对较小.在低pH下,腐殖酸(HA)对3种红壤的吸附均有强化作用.结果表明:在pH＜7时,不同红壤对Eu(Ⅲ)的吸附以外层表面络合或离子交换为机理,pH＞7后内层络合吸附则为主要吸附机理.不同组成的红壤吸附结果表明:氧化铁等对吸附有较强的抑制作用,而有机质对吸附在一定的pH及温度范围内有强化作用.动力学研究结果表明:准二级动力学方程能够对吸附过程进行较好地描述.而以Freundlich吸附模型能够对吸附热力学过程进行较好模拟,同时,计算了相应的热力学函数,结果表明3种红壤的吸附均是自发和吸热的过程.     

毛细管法研究pH值对Eu(Ⅲ)在压实皂土中的扩散和吸附影响

利用毛细管法研究pH值对Eu(Ⅲ)在压实皂土中的吸附和扩散影响. 结果表明, Eu(Ⅲ)在压实皂土中的扩散随pH值升高而减小, 吸附量随pH值升高而增加. 皂土密度对放射性核素的吸附和迁移起重要作用. 实验结果与Fick定律理论计算值一致.