“Tali Glaciation” on Massif Diancang

The term of "Tali Glaciation" is nominated from Massif Diancang in Yunnan Province. The confusing process of the term's being put forward is confirmed through literature checking. Based on several times of field trip, the glacial landforms in this region are studied in detail, and the magnitude of the glaciation was determined. According to the numerical ages from TL, AMS 14C and OSL dating, the ear-liest glacial advance on Massif Diancang occurred at 30―40 ka BP, followed by the advances at the last stage of the last glaciation, the late glacial and neoglations in turn, until glaciers vanished at 1.2―1.5 ca. a BP in this region. It can be concluded that glaciers were limited above 3600 m a.s.l., and no glaciers existed on the lower part and adjacent mountains since the last glaciation.     

羌塘错尼地区新生代火山岩研究

同位素年代学、岩石学、矿物化学和岩石地球化学特征研究表明,羌塘错尼地区火山岩可以划分为3套岩石组合：①高钾钙碱性火山岩(44Ma～38Ma);②钾玄岩质火山岩;③强碱性火山岩(34Ma～19Ma)。3套火山岩均是大陆碰撞造山后期岩浆作用的产物,始新世以来,随着该区由碰撞、挤压作用发展到出现走滑,应力环境由挤压转变为张性,导致依次喷发高钾钙碱性火山岩、钾玄岩质火山岩和强碱性火山岩。强碱性火山岩的地球化学特征暗示了岩浆源区受到过地幔流体的强烈交代作用。     

饶阳凹陷大王庄地区古近系层序地层特征

运用地层基准面原理和分析方法,综合研究钻井、测井和三维地震资料,在饶阳凹陷大王庄地区古近系识别出两种层序界面类型———不整合面和沉积作用转换面;在井-震精细标定的基础上建立了层序地层格架。饶阳凹陷大王庄地区古近系东营组至沙三段发育9个层序界面,将其划分为2个超长期基准面旋回(二级层序)和8个长期基准面旋回(三级层序);分析古近系不同层序基准面上升期与下降期地层叠加样式及沉积相、沉积微相构成。确定沙一段是大王庄地区最重要的岩性油藏勘探目的层系,其储集层类型主要为三角洲前缘分流河道砂和滩坝砂;有利储集相带主要分布于基准面上升期和下降期的早期。     

煤岩应力敏感性的有限元数值模拟

利用有限元软件对比了煤岩与砂岩的裂缝界面应变分布规律。有限元法模拟表明：煤岩与砂岩的应力分布有较大差异,煤岩裂缝的最大应变约为砂岩裂缝最大应变的25倍,且煤岩裂缝更容易闭合;结合煤岩裂缝在不同有效应力条件下的应变规律,给出了渗透率随有效应力变化的拟合公式。参照砂岩应力敏感实验程序,对不同围压下煤岩渗透率变化规律的实验研究发现,渗透率拟合公式计算值与实验实测值变化趋势一致,部分煤样渗透率实验值与预测值平均误差小于10%,拟合精度高。研究结果对预测实际煤岩的渗透率和不同有效应力下煤岩渗透率的变化规律具有较高的实用价值。     

Simulation of the Effect of Water-vapor Increase on Temperature in the Stratosphere

To analyze the mechanism by which water vapor increase leads to cooling in the stratosphere, the effects of water-vapor increases on temperature in the stratosphere were simulated using the two-dimensional, interactive chemical dynamical radiative model (SOCRATES) of NCAR. The results indicate that increases in stratospheric water vapor lead to stratospheric cooling, with the extent of cooling increasing with height, and that cooling in the middle stratosphere is stronger in Arctic regions. Analysis of the radiation process showed that infrared radiative cooling by water vapor is a pivotal factor in middle-lower stratospheric cooling. However, in the upper stratosphere (above 45 km), infrared radiation is not a factor in cooling; there, cooling is caused by the decreased solar radiative heating rate resulting from ozone decrease due to increased stratospheric water vapor. Dynamical cooling is important in the middle-upper stratosphere, and dynamical feedback to temperature change is more distinct in the Northern Hemisphere middle-high latitudes than in other regions and signiffcantly affects temperature and ozone in winter over Arctic regions. Increasing stratospheric water vapor will strengthen ozone depletion through the chemical process. However, ozone will increase in the middle stratosphere. The change in ozone due to increasing water vapor has an important effect on the stratospheric temperature change.     

基于ISODATA聚类的点云分割算法实现

应用了ISODATA聚类算法,在VC＋＋6．0环境下实现了点云分割,利用OpenGI。进行分割效果显示,并与K—means算法的分割效果进行了比较。     

黔北下寒武统黑色岩系元素赋存状态及富集模式

通过对黔北下寒武统黑色岩系的地质和地球化学分析,结合前人研究成果,探讨了黑色岩系元素赋存状态及富集模式。黑色岩系富含有机质,粘土矿物成分高,Ni-Mo矿层以硫化物矿物为主,表明元素赋存状态主要为硫化物态、有机质结合态和粘土矿物吸附态等,但各个元素的赋存状态有所不同。黑色岩系多元素富集层是贵金属元素、稀土元素和其他微量元素的富集体,富集系数高。黑色岩系多元素的异常富集是古地理环境、构造运动、热液活动和缺氧事件的综合作用结果。     

基于Morton码的一种动态二维游程压缩编码方法

本文在分析常规二维游程压缩编码方法缺陷的基础上,提出了一种基于Morton码的二维游程压缩编码方法.该方法按Monon码由小到大顺序扫描栅格数据,对于由2×2个像元组成的格网由Morton码生成格网左上角像元的行列号,并且用动态线性表通过比较像元的属性值,存储压缩结果,建立二维游程编码.实验表明,该编码方法在运行时间和...     

东天山阿齐山地区石炭纪汇宇岛弧花岗岩的厘定及意义

笔者在参加新疆东天山阿齐山一带1∶5万区域地质矿产调查工作中,通过对北天山岛弧区侵入岩的岩石学、岩石化学、岩石地球化学、同位素等的调查与研究,依据同源岩浆演化系列,将北天山岛弧区构造—岩浆岩带划分为主期中—酸性花岗岩和补充期钾质花岗岩两个大的岩浆演化阶段。其中,在北天山岛弧区原划三叠纪汇宇板内花岗岩获得中粒钾长花岗岩锆石U-Pb法313.8±0.8~351.3±0.9 Ma同位素测年值,据此将其侵入时代厘定为石炭纪,并通过岩石地球化学研究,认为其具离散式分布、属“S”型壳源花岗岩,具反序列成分演化,主要为岩浆结晶分异形成,属岛弧花岗岩的补充期侵入体。     

海洋异养细菌对小球藻生长和无机营养盐吸收的影响研究

从胶州湾海洋异养细菌同小球藻(Chlorella vulgaris)的共存体系中,分离出6株形态特征差异较大的异养细菌,并做变性凝胶梯度电泳(Denature Gel Gradient Electrophoresis,DGGE)分析.其中一株对小球藻的生长有较大的促进作用,而其余菌株则没有明显的效果.6株细菌能在小球藻产生的胞外溶解有机物(Dissolved Organic Mate rials,DOM)溶液中生长良好,共存细菌对提高菌藻体系对无机营养盐的吸收具有较大的贡献.