滇西哀牢山构造岩浆岩带阿扎鲁花岗岩岩石地球化学特征及构造背景浅析

阿扎鲁岩体分布于哀牢山构造岩浆岩带中,通过野外地质调查与岩体剖面测量、岩石样品采集分析、薄片显微镜下鉴定等手段与方法,对其野外地质特征、岩石学特征及岩石地球化学特征进行了系统研究,并探讨了其形成的构造环境。研究结果表明,阿扎鲁岩体的岩性为花岗岩,岩体分布明显受断裂控制;岩石局部可见后期变质的片岩及糜棱岩,岩石具浅层侵入的特点;阿扎鲁花岗岩的A/NCK多大于1.0,为铝饱和型;具有富硅钾、低钙、贫铁、镁、钛的特点,岩石为高钾钙碱性系列。其主量元素、微量元素及稀土元素地球化学特征均表明,该岩体形成于造山期碰撞后期的弧陆碰撞阶段。      

数字钻孔全景影像中结构面特征智能识别方法

数字钻孔全景影像是识别深部岩体结构面的主要方法,传统解译方法主要依靠手动操作完成,其结果存在较强的人为性、主观性和较大误差。针对数字钻孔全景影像技术,提出了一种考虑结构面图像灰度分布特点的智能识别新方法。通过钻孔图像的灰度化、降噪预处理后利用结构面定位信号特征值D定位结构面,获取其所在区域图像;再进行边缘检测、阈值分割及形态学等处理,通过拟合边缘曲线并结合数学表征方法实现了结构面特征(产状、隙宽等几何参数)的智能化识别。通过对地下水封洞库工程深部岩体数字钻孔影像的实例分析,运用本智能识别方法获得结构面特征信息相对于传统人工识别方法,其结果的准确性和客观性更强、批量识别效率更高。这对这数字钻孔影像的智能、快速识别具有一定的参考价值。      

对盂县潘家会矿区辉长苏长岩体地质特征及成矿远景的分析

通过地质填图和钻探工程控制,大致查明了盂县潘家会矿区辉长苏长岩体的分布范围、规模、形态、产状以及岩体的含矿层位等,并通过区内成矿地质背景和矿床特征的分析,充分说明了该区辉长苏长岩体成矿地质条件较好,可望提交一个与基性岩有关的多金属矿床找矿基地。     

南泥湖钼矿田稀土元素地球化学特征

本文论述了南泥湖钼矿田中酸性小岩体稀土元素的分布、演化特征和在矿物中的分布以及稀土元素在造岩矿物中的分配等三个重要问题。对该区燕山期中酸性小岩体的成因、物质来源等问题的解决提供了重要依据。     

青海省祁连县大拉洞柏杨沟矿区煤岩层对比研究

通过研究太原组的沉积特征及聚煤变化规律,采用了标志层、煤岩层组合特征、层间距、测井曲线形态等方法,对矿区内煤层、岩层进行了综合对比。确定了该区主要煤层的赋存层位、形态、分布及变化特征,对周边地区找煤工作具有一定的指导作用。     

北秦岭松树沟铬铁矿床三维地质建模及其找矿意义

北秦岭松树沟超镁铁质岩体位于商丹缝合带北侧、北秦岭构造带南部边缘,是陕西省出露面积最大的超镁铁质岩体,岩体中赋存了小型铬铁矿床,深部是否具有成矿潜力备受关注。松树沟超镁铁质岩体中岩相呈对称分布,结合钻孔与物探资料,推测岩体呈透镜状产出;岩石地球化学数据显示岩体中部橄榄岩相具有变质橄榄岩或阿尔卑斯橄榄岩特征,边部橄榄岩相具有超镁铁质堆晶岩特征;松树沟与西藏罗布莎纯橄榄岩体中铬铁矿的矿物地球化学特征类似,由此提出松树沟超镁铁质岩体具有形成"豆荚状"和层状铬铁矿体的潜力。基于前期勘探获得的343个钻孔资料,通过3DMine软件建立了矿床的三维地质模型,剖析了矿体分布规律、钻孔控制程度、富矿与贫矿赋存部位等。根据贫矿的富集部位、流动构造、岩浆分异程度、化探异常,预测了2个具有深部找矿潜力的地段,并提出了找矿标志与找矿方法,为本区勘查找矿提供思路。     

均质地层非稳态热传导特征分析

基于在均质地层场地内进行的热响应试验,此文通过对地埋管热响应试验观测孔不同深度地温数据与稳态温度场理论分析特征对比,从时间和空间两方面总结了非稳态下均质岩体内竖直地埋管周围的热传导特征。分析发现:该次试验竖直地埋管排热过程中周围地层非稳态地温场的分布特征与根据公式求得的均质无限大介质中线热源排热形成的稳态地温场分布在空间分布形态上有一致性;持续排热工况下竖直地埋管的影响半径为一动态数值,与排热持续时间相关性较大。     

建平地区三座庙序列侵入岩侵位机制讨论

通过野外对三座庙序列侵入岩的岩体平面与剖面形态、岩体的内部构造、岩石与围岩的构造型式、接触带的度形特征等宏观地质特征的研究,推测岩体侵入位机制为强力挤入方式定位,即气球膨张式。笔者运用岩石的有限应变测量原理和方法,结合岩组分析及流变学、现代变形理论,对三座庙序列的侵入岩岩石做了有限应变测量和岩组分析工作,所得定量资料为确定岩体的浸位机制提供了理论依据。三种岩石有限应变测量,即:算术平均法、长短轴法、Rf/φ曲线法的富林指数k值均在0相似文献   

大柳树坝址区松动岩体中硐室围岩破坏变形特征

以黄河大柳树坝址为例,对松动岩体硐室围岩破坏变形特征进行了研究,松动岩体具有断裂张开、节理错动、岩体架空、岩石高强度、岩体波速等特征。研究得出松动岩体硐室围岩破坏变形特征为结构松散、塌落范围大、变形破坏受水影响大及围岩压力以重力为主等特点。     

岩崩坡面撞击碎裂特征离散元模拟

岩崩坡面撞击破碎是运动轨迹难以预测的重要原因,其中坡体几何特征是影响破碎块体运动变化特征的关键因素。为了研究岩崩撞击破碎过程及坡体几何特征对岩崩块体运动特征的影响,利用离散单元法(PFC^2D)模拟技术,通过统计典型岩崩灾害点岩体结构与坡体几何特征,建立了岩崩自由落体-撞击破碎-运动堆积模型,剖析了在不同坠落高度、撞击角度条件下岩崩坡面撞击碎裂过程,获得了块体运动速度、裂纹数量和冲击力变化曲线,同时采用双参数Weibull分布对碎裂块体破碎程度进行了描述。实验结果表明：破裂过程分为接触-解体、挤压-碎裂及独立运动3个阶段;岩体碎裂由撞击点开始,沿结构面先出现解体,再产生新断裂面的岩石破碎;块体速度、裂纹数量和冲击力的骤变均发生在接触-解体与挤压-碎裂阶段,块体速度骤降,呈现出“阶梯效应”,冲击力骤升,表现为“双峰现象”,同时随着坠落高度增加或撞击角度减小,“阶梯效应”与“双峰现象”更为明显;同一撞击角度条件下,坠落高度的增加使得撞击动能增加,进而增大了破碎程度,导致粒径分布范围与特征粒径尺寸的减小;同一坠落高度下,撞击角度的增加,意味着接触面积的减小,进而降低了破碎...     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Foreword

正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Exposure ages and radiogenic ages of ureilite(GRV 024516) and ordinary chondrite(GRV 024517) from Antarctica

The GRV 024516 and GRV 024517 meteorite samples collected from Grove Montains,Antactica are ureilite and H5 ordinary chondrite,respectively.Based on the study of mineralogy-petrology,the cosmic-ray exposure ages and gas retention ages of these two meteorites were determinated and calculated.Their cosmic-ray exposure ages are 33.3 Ma,51.7 Ma,and gas retention ages are 1936.8 Ma and 3720 Ma,respectively.The ureilite contains diamond,graphite and amorphous C,which are mainly carrier of noble gases indicating obviously shock metamorphism effects,which induced 40Ar partial loss.The H5 chondrite indicates thermal metamorphism of parent body,its gas retention age fall the range between 3220 Ma and 4510 Ma of the least shocked H5 chondrites     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied     

Advances in Polar Science CONTENTS(Volume 25,2014)

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Guide to Authors： Journal of Mountain Science

<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet.     

Journal of Mountain Science(JMS)

<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by