山西义兴寨金矿床地球化学研究

晋东北地区以唐河大断裂为核心的一组早燕山期 NW向张剪性断裂与区域 NE向复向斜复合部位 ,控制着区内燕山期中酸性浅成侵入体及其与之有关的铁、金、铜矿化 ,义兴寨金矿是该地区具代表性的典型矿床。金矿床为热液型脉状金 -多金属矿床 ,矿体受岩体和断裂构造控制。金矿床分 4个成矿期 ,8个亚期。对金矿床的矿床地质特征、成矿流体成分、性质、成矿物理化学条件及成矿时代的研究表明 ,成矿溶液的 p H值为 6 .1 6～ 6 .5 3:Eh值为 -0 .2 81～-0 .2 80 ;lgf O2 =-3.6～ -2 9,lgf CO2 =4 .3～ 5 .2 ;成矿温度为 1 90～ 349℃ ;成矿压力为 2 0 .0～ 76 .0 MPa;矿床主成矿期石英的 40 Ar— 3 9Ar坪年龄为 ( 1 31 .4± 3.1 ) Ma。     

扬子克拉通北缘新元古代岛弧花岗岩类成分极性及成因的地球化学探讨

对扬子克拉通北缘新元古代岛弧花岗岩类成分极性的地球化学研究表明,在SiO_2含量相近的条件下,由北向南岩石中K_2O、K_2O+Na_2O、K_2O/Na_2O逐渐增加,而CaO逐渐降低;从北向南,微量元素Rb、Ba、Th、Zr、Nb、Ta、 ∑REE及Rb/Th、Rb/Nb、∑LREE/∑HREE、(La/Yb)_N 逐渐增加或具增加趋势,而 Sr、Co、Ni和Sr/Ba具逐渐降低或具降低趋势;同位素组成由北向南δ~18O、εs_r(t)系统增高,而ε_(Nd)(t)逐渐降低。这些组分的空间变化规律与环太平洋带位于俯冲带上盘向陆一侧的岛弧或大陆边缘岩浆中出现的成分极性规律相一致.分析认为,大陆壳物质以不同比例的加入是影响俯冲带岛弧花岗质岩浆成分极性的一个重要因素,向陆一侧岩浆中陆壳物质所占的比例逐渐增高,而幔源物质所占比例逐渐降低。     

钛（Ⅳ）的反相萃取柱色层新体系研究及应用

本文研究了以ｃＨＣｌ＝８ｍｏｌ·Ｌ－１盐酸为移动相，以聚四氟乙烯负载的钽试剂－ＣＨＣｌ３为固定相反相萃取层析钛（Ⅳ）的新体系，柱上层析的钛用ｃＨＣｌ＝３ｍｏｌ·Ｌ－１盐酸洗脱后经二安替比林甲烷光度法测定，不仅钛回收率可达１００％，并可使钛（Ⅳ）与多种离子分离。能用于矿物岩石类复杂样品及其他物质中钛的分离富集与测定，方法简便快速。     

甘肃天水夏家坪金矿地质特征

夏家坪金矿位于西秦岭反＂S＂弧形构造东段Au-Ag-Cu-Fe-Pb-Zn成矿带中,矿体产出受下古生界李子园群沉积-火山岩系控制。矿体多呈带状、透镜状产出,具收缩膨大、尖灭再现及分支复合特征。容矿岩石主要为变砂（泥）岩、破碎石英脉、硅化角砾岩等。矿石类型以构造蚀变岩型为主,局部为石英脉型。围岩蚀变具分带性,矿化可分为早期的金和晚期的银铅锌两个主要成矿阶段。     

华北克拉通南缘豫西燕山期花岗岩类的 Pb-Sr- Nd同位素地球化学特征

对华北克拉通南缘豫西燕山期具类似于板块俯冲带花岗岩成分变化规律（成分极性）的八宝山、柳关、后瑶峪花岗斑岩类的Pb、Sr、Nd同位素地球化学特征的研究,揭示了这些斑岩的主要物质来源是新太古代的太华群斜长角闪岩部分熔融产生的熔浆与地幔来源物质混合形成的产物。稀土元素含量非常低的八宝山花岗斑岩在岩石形成过程中有流体与其发生交代作用,由于交代及混合作用造成花岗斑岩类的Rb—Sr等时线多为假等时线;柳关花岗斑岩基本上完全由太华群的斜长角闪岩提供物质,豫西地区燕山期的花岗岩岩基其物质来源更为复杂,可能有宽坪群为其提供物质。     

海洋地震资料相位控制处理——东海研究实例

为了满足定量解释的需要,地震资料处理必须是高分辨率、振幅保持和相位控制的.面向海洋地震资料的相位控制处理技术包括利用远场信号进行确定性零相位化、Q补偿、预测反褶积及剩余相位校正等.利用模拟远场信号求取确定性去气泡及零相位化算子.此文基于相位控制处理,讨论了海洋地震资料的相位和极性判别方法,探讨了大于24 ms算子长度的预测反褶积对于保持信号形状的必要性,介绍了东海三维地震资料相位控制流程.     

Cyclic behavior and failure mechanism of self‐centering energy dissipation braces with pre‐pressed combination disc springs

A new type of bracing system composed of friction energy dissipation devices for energy dissipation, pre‐pressed combination disc springs for self‐centering and tube members as guiding elements is developed and experimentally studied in this paper. The mechanics of this system are explained, the equations governing its hysteretic responses are outlined and large‐scale validation tests of two braces with different types of disc springs are conducted under the condition of low cyclic reversed loading. The experimental results demonstrate that the proposed bracing system exhibits a stable and repeatable flag‐shaped hysteretic response with an excellent self‐centering capability and effective energy dissipation throughout the loading protocol. Furthermore, the maximum bearing force and stiffness are predicted well by the equations governing its mechanical behavior. Fatigue and destructive test results demonstrate that the proposed bracing system can maintain stable energy dissipation and self‐centering capabilities under large deformation cyclic loading even when the tube members exceed the elastic limit and that a larger bearing capacity is achieved by the system that has disc springs without a bearing surface. Copyright © 2016 John Wiley & Sons, Ltd.     

http://www.sciencedirect.com/science/article/pii/S1674987114001121

The Chinese Tianshan belt of the southern Altaids has undergone a complicated geological evolution.Different theories have been proposed to explain its evolution and these are still hotly debated.The major subduction polarity and the way of accretion are the main problems.Southward,northward subduction and multiple subduction models have been proposed.This study focuses on the structural geology of two of the main faults in the region,the South Tianshan Fault and the Nikolaev Line.The dip direction in the Muzhaerte valley is southward and lineations all point towards the NW.Two shear sense motions have been observed within both of these fault zones,a sinistral one,and a dextral one,the latter with an age of 236-251 Ma.Structural analyses on the fault zones show that subduction has been northward rather than southward.The two shear sense directions indicate that the Yili block was first dragged along towards the east due to the clockwise rotation of the Tarim block.After the Tarim block stopped rotating,the Yili block still kept going eastward,inducing the dextral shear senses within the fault zones.     

钢筋混凝土柱考虑损伤累积的反复荷载-位移关系分析

为能在反复荷载作用下钢筋混凝土柱的荷载-位移关系分析中考虑柱低周疲劳性能,提出了一损伤模型,对柱中纵向受力钢筋和混凝土的损伤状态作评估与记录。将这一记录材料性能信息的损伤指标带入材料各自的恢复力模型以考虑产生损伤后材料的强度和刚度退化。基于多弹簧模型对不同变幅加载路径下及等幅低周疲劳加载下钢筋混凝土柱的空间反应进行了数值计算模拟。与已有试验结果比较表明,所提材料层次上的损伤累积模型以及考虑损伤累积效应的柱构件空间荷载-位移关系分析方法具有一定的精度,为钢筋混凝土柱的抗震性能分析提供了一个辅助工具。