大别山超高压变质岩的变形特征及其地质意义

大别山超高压变质岩至少经过５期变形。第１期产生于榴辉岩相变质前；第２期大致与榴辉岩相变质作用同步．岩石产生紧密同斜褶皱及榴辉岩相糜棱岩；第３期产生于超高压变质岩向中地壳折返的过程中，以榴辉岩的布丁化及基质的透入性剪切为特征；第４期主要形成剪切条带及伸展沿劈理．是大别山碰撞后差异隆升，岩层向南滑脱的结果；最后一期为脆性变形，岩层沿北东向断层产生左行平移。通过超高压变质岩的变形分析，可以了解超高压变质岩形成和折返的构造运动过程。     

海南岛几个重大基础地质问题的探讨

海南岛有无泥盆纪地层？有无加里东运动？有无加里东期花岗岩？历来是大家关注和争论的焦点问题。在１：５万昌江县幅和邦溪幅地质调查研究中,笔者对上述问题进行了探讨,并取得了一些重要进展：首次在海南岛发现珊瑚化石Ｃｙｓｔｏｐｈｒｅｎｔｉｓ ｋａｌａｏｈｏｅｎｓｉｓ Ｙｕ,结合旋回地层学研究主为,在昌江县鸡心－鸡实一带南好组（Ｃ１ｎ）中下部可能存在中晚泥盆世地层;首次发现并圈定了加里东期花岗岩体,时代为３６     

地气法－找深部金矿的新方法

介绍一种八十年代发展起来的找深部金矿的新方法一地气法。文中讨论了地气法的找矿机理，认为是地壳中上升气流将成矿元素微粒携带至地表而造成多元素异常。对工作方法着重讨论了地气采样与测试的系统，以及比较了积累式取样的效果。最后列出山东招远地区大尹格庄金矿８０号勘探线的地气测量多元素异常图。     

富钴结壳生长过程中铁锰氧化物矿物组合的变化

富钴结壳的矿物学研究是一个难点，本文运用电子探针微区分析结合X射线衍射和矿相显微镜观察的综合方法对富钴结壳中的铁锰氧化物矿物组合及其组分变化进行了研究，研究发现，富钴结壳是从与胶状粘土类混合共沉积开始生长的，结壳内部的韵律层和柱状构造也是始于粘土层终于粘土层的；铁锰团粒的核心一般是较纯的水羟凶国矿小核心，可能是在生物媒介作用下在水体中形成后沉降叠积的，FM、FPE海山结壳的中层存在一较纯水羟锰矿层，但该层中Co含量FM15比FPE06低得多，可能反映了FM15在该层形成时Co通量较低，而该层在FN12中不存在，反映了区域环境的较大差异，在FN12火焰状构造亚带存在Mn氧化物和Fe氧化物的极度分异现象，可能反映了结壳形成环境的重大变化。     

祁连山老虎沟12号冰川冰内结构特征分析

利用探地雷达(Ground Penetration Radar,GPR)调查冰川冰内结构和冰层厚度是一种监测冰川变化常用手段.应用麦克斯维(Maxwell)方程的二维时域有限差分(FDTD)方法,通过将模拟图像与老虎沟12号冰川的实测图像的对比,分析了雷达剖面中的几种反射特征,如冰裂隙、融洞、暖冰等.对比结果表明,GP...     

锡铁山石晶体结构中Fe3+的两种亚晶位

对产于青海锡铁山铅锌矿氧化带中的锡铁山石进行了５７Ｆｅ穆斯堡尔谱的研究，在晶体结构分析的基础上进行了谱峰的重新解释，发现由于配位Ｃｌ－离子无序占位引起Ｆｅ３＋离子所占配位八面体的畸变，形成了Ｆｅ３＋的两种亚晶位，并根据结构数据指定了这两种亚晶位各自形成的四极双峰。     

Iron isotopic analyses of geological reference materials on MC-ICP-MS with instrumental mass bias corrected by three independent methods

Here we report iron (Fe) isotopic data of three pure Fe solution standards (IRMM-014, GSB Fe, and NIST 3126a) and five widely used geological reference materials (RMs) from the United States Geological Survey and Geological Survey of Japan obtained on a Neptune Plus multi-collector–inductively coupled plasma–mass spectrometer (MC-ICP-MS) in our laboratory over the past 3 years. The instrumental mass bias was corrected by three independent methods: sample-standard bracketing (SSB), Ni doping?+?SSB, and ⁵⁷Fe–⁵⁸Fe double spike?+?SSB. Measurements reveal that both the Ni doping and double spike methods helped calibrate short-term fluctuations in mass bias. Collectively, almost all measurements of RMs yielded δ⁵⁶Fe within?±?0.05 of recommended values, provided that each sample was measured four times on MC-ICP-MS. For the first time, new recommended values for NIST SRM3126a are reported (δ⁵⁶Fe?=?0.363?±?0.006, 2SE, 95% CI; and δ⁵⁷Fe?=?0.534?±?0.010, 2SE).     

南江县铁炉坝地区含金丰度及金矿化围岩蚀变特征

对四川省南江县铁炉坝地区各类岩石和土壤的含金丰度进行了阐述，对金矿化的围岩蚀变特征进行了较详细的论述，指出黄铁矿化一电气石化-硅化的蚀变组合是该区金成矿的指示性标志。     

An application of a new method in permafrost environment assessment of Muli mining area in Qinghai-Tibet Plateau,China

The permafrost environment in the Muli mining area, an opencast mining site in the Qinghai-Tibet Plateau, China, is now undergoing significant degradation because of the ongoing mining activities. The permafrost environment in this mining site had already been evaluated by previous study, in which analytic hierarchy process was applied. Although this method can roughly characterize the permafrost environment of this mining site, it has limitations by being easily affected by man-made factors. In view of this limitation, this study attempts to employ a new method, the catastrophe progression method, to estimate the current stage of the permafrost environment in this mining area. The results show that, by catastrophe progression method, currently the calculated indexes of the permafrost freezing–thawing disintegration, permafrost thermal stability, permafrost ecological fragility, and the permafrost environment are 0.43 (general situation), 0.77 (general situation), 0.71 (bad situation) and 0.83 (general situation), respectively. These values imply that the permafrost environment has been damaged by anthropologic activities to a certain degree and potentially may be further degenerated. However, at this degree, a new equilibrium stage of permafrost environment could be achieved if the current state of environmental degradation is stabilized and treatments are constructed against further damages.     

东亚季风“2.8ka”事件高分辨率的石笋记录

据湖北省神农架永兴洞一支石笋的8个230Th年龄、648个δ18O数据,建立了晚全新世4.40～ 1.75ka B.P.时段平均分辨率为4a的东亚夏季风演化序列,其中在2.92～ 2.74ka B.P.期间,δ18O发生显著正偏,幅度达2.5‰,指示一个显著的弱季风事件(这里称之“2.8ka”事件).该事件以夏季风缓慢减弱开始,迅速增强结束,事件内部有两个次一级的振荡旋回(两峰三谷结构),在内部细节与转型特征上类似湖北和尚洞石笋δ18O记录的“8.2ka”事件,暗示发生在全新世这两个冷事件的驱动机制基本一致.这两个弱季风事件都发生在太阳活动明显减弱时期,并分别与北大西洋Bond 2和Bond 5冰漂碎屑事件同步,表明百年尺度的东亚季风环流的演化由太阳活动和北高纬气候共同驱动.