辽东半岛南部原生金刚石特征

辽东半岛南部金刚石在含矿程度不同的金伯利岩岩管中,其主要物理特征和包体成分等是不同的。富矿金伯利岩体中金刚石的特征是颜色种类较多,晶形复杂(以曲面菱形十二面体为主),颗粒粗大,蚀象发育;含包体成分复杂。贫矿金伯利岩体中的金刚石颜色种类少,晶形单一(以平面八面体为主),颗粒细小,蚀象不发育;包体成分简单。高温碱熔试验与热台测定结果表明金刚石晶体形态的演化过程,盆刚石从650℃开始熔解,即八面体晶棱和顶角出现钝化,在温度不断升高时八面体所有晶棱逐渐熔解变为晶面,进而形成曲面菱形十二面体。因此可以推断,金刚石曲面菱形十二面体的初始晶形应是八面体晶形。金刚石包体中的镁铝榴石与金伯利岩中斑晶镁铝榴石的化学成分是一致的,说明二者来自同一岩浆源。     

广西佛子冲铅锌矿田含矿围岩稀土元素地球化学特征与矿床成因探讨

本文根据佛子冲铅锌矿田中含矿围岩的稀土元素含量、配分模式及其它地球化学特征,探讨其成矿物质来源及矿床成因。该矿田中花岗斑岩、花岗闪长岩、英安斑岩及各种含矿围岩.虽然其稀土元素含量各不相同.但配分模式却大致相同,都为右倾富轻稀土型.这与广平岩体呈“V”字型配分模式显著不同。含矿矽卡岩的稀土含量具有富集型式和亏损型两种,前者以龙湾为代,稀土总量为334.99×10~(?):后者以刀支口、大罗坪、舞龙岗、勒寨为代表.稀土总量仅为弱蚀变条带状灰岩的1/3～1/2。蚀变岩石(指富含帘石、石英、缘泥石钙质砂岩)稀土总量较高.而强蚀变岩石(交代石英岩)与条带状灰岩、砂岩的稀土总量较低。上述数据.说明:本矿田的岩浆岩、矿化矽卡岩、蚀变钙质砂岩、条带状灰岩、砂岩等归根结底来源于地槽沉积物(含有部分海相火山物质加入);成矿溶液则具有多种来源,既有富含稀土元素的岩浆热液,也有富含F、Cl的贫稀土的深循环地下水热液参与。故本矿田是一以岩浆热夜为主的多因复成矿床。     

黔东南与黔西南浊积岩中两种不同类型金矿的比较

黔西南和黔东南是贵州的两个主要产金地区,大部分金矿都产于浊积岩中。但黔西南的金矿主要是含金蚀变岩型（或称卡林型、微细浸染型）,以不可见金为主;黔东南的金矿却是含金石英脉型,以明金为主。这两种金矿都产在造山带,赋矿围岩是浊积岩,区内岩浆侵入作用不显著,成矿受背斜与断裂控制,成矿温度不高,矿石物质成分基本一致。研究表明,产生不同类型矿化的原因主要在于：黔东南地区的容矿岩石是浅变质的硅质碎屑岩,碳酸盐矿物很少;而黔西南地区是未变质的富钙硅质碎屑岩,碳酸盐矿物多。前者形成石英脉型金矿床,后者形成蚀变岩型金矿床。     

胶莱盆地南缘高家宅科地区短波红外光谱特征及金多金属矿勘查指示意义

胶莱盆地南缘沿五莲-青岛深大断裂及其次级断裂,目前已发现大量的金铅锌多金属矿床(点),除典型的隐爆角砾岩型五莲七宝山金铜矿外,其余各矿床沿断裂发育,以石英脉型矿化为主,均显示热液矿床特征。高家宅科地区已发现的金铅锌多金属矿点,分布在以高岭断裂为主的NNW—近SN向断裂中,但基于成矿规律及成矿作用等认识的不足,该地区找矿工作进展缓慢。本次研究通过短波红外光谱测量,在该地区识别出以伊利石、白云母、绿泥石、高岭石、蒙脱石和菱铁矿为主的蚀变矿物,以面积性绢云母蚀变为主(伊利石+白云母)。绢云母矿物高IC值和低Pos2200吸收峰值分布区域均与区内NNW—近SN向断裂和绢英岩化蚀变带具良好的相关性。结合已有成矿事实,认为区内以高岭断裂为主的NNW—近SN向断裂更靠近热液中心,同时,绢英岩化蚀变带中异常的高IC值和极低的Pos2200吸收峰值分布区域,同样具成矿的可能性。     

山东招远界河金矿床矿化垂向变化特征研究

界河金矿床作为胶东地区典型的蚀变岩型金矿床,目前通过坑道工程揭露已经探明其矿体垂深达800m左右。从矿区
浅部向深部,其矿化呈现出一定的规律性变化:矿化类型呈现出浅部以蚀变岩型矿化为主、深部以裂隙脉型矿化为主的分带规律;
矿体规模逐渐变小,矿化强度逐渐减弱,矿体产状也逐渐变缓。此外,矿物组分、矿石组构、围岩蚀变以及微量元素特征等从浅部
向深部也均呈现出规律性的变化。结合区域内石英脉型和蚀变岩型金矿化的垂向分带特征,初步建立了胶东地区金矿化在垂向
上的“三段式”分带模式:浅部以石英脉型矿化为主,中部以蚀变岩型矿化为主,深部则以裂隙脉型矿化为主。      

中哈俄阿尔泰稀有金属矿床时空分布、成因及成矿规律

中哈俄阿尔泰发育许多大型—超大型稀有金属矿床,是世界著名的稀有金属成矿省。该成矿省可分为3个稀有金属成矿带,自西南向东北依次为哈萨克斯坦Kalba-Narym、中国阿尔泰和俄罗斯山区阿尔泰等。这3个成矿带稀有金属矿床以伟晶岩型为主,但伟晶岩与花岗岩关系及其伟晶岩成因不一致:在哈萨克斯坦Kalba-Narym成矿带和俄罗斯山区阿尔泰成矿带,矿区发育同期的花岗岩,伟晶岩是花岗质岩浆分异演化的产物;而在中国阿尔泰成矿带,矿区未见同期的花岗岩,伟晶岩成因有变质深熔和岩浆分异结晶两种不同认识。这3个成矿带稀有金属矿床的成矿规律也有差异:在成矿时代上,自西南向东北,矿床形成分别集中在二叠纪、三叠纪和晚三叠世—早侏罗世,成矿时代逐渐变新;在成矿类型和元素组合上,哈萨克斯坦Kalba-Narym成矿带和中国阿尔泰成矿带的稀有金属矿床以伟晶岩型为主,元素组合分别为Ta-Nb-Be-Li和Be-Li-Nb-Ta(-Cs-Rb-Hf),俄罗斯山区阿尔泰成矿带稀有金属矿床则以云英岩型钼钨(铍)矿床为主,有少量的伟晶岩型锂钽矿床。     

论广西横县南乡金矿成矿地质背景及矿床成因

广西横县南乡金矿区是广西金矿储量达中型的少数矿区之一;所处区域构造位置独特,赋矿层位新,地表岩浆岩出露少,导矿构造规模较大,容矿构造发育,金矿石矿物成分简单,矿石类型多样,矿体形态较复杂;围岩蚀变发育,以硅化为主;金与砷汞元素关系较密切;石英脉矿物与包体碳、氢、氧同位素、包体成分、温度等表明主成矿过程具有低温热卤水活动特征;成矿具有多期性,时代较新,为白垩系晚期至第三系早期;金矿成矿阶段与矿物生成次序、矿物世代、围岩蚀变类型、热液性质、古潜水面、构造活动等关系密切。依此提出了找矿标志、成矿模式和成矿预测。     

北大城地区韧性剪切带特征及金矿化

北大城金矿是受韧性剪切带控制的小型金矿。韧性剪切带分布在北大城—马鹿沟一带,总体呈北东东—近东西向展布,发育于太古宙建平群小塔子沟组的区域变质岩中。韧性剪切带早期以韧性剪切为主,晚期以脆性变形为主。韧性剪切带内由初糜棱岩、糜棱岩,超糜棱岩组成。宏观微观构造明显。金矿化带分布在韧性剪切带内的晚期断裂构造中,为石英脉型和蚀变岩型。     

对小彦铜钼多金属矿床找矿标志的探讨

小彦铜钼多金属矿位于灵丘县北东部,为一铜钼多金属矿,为矽卡岩型矿床。结合相关资料及本次工作实践认为,该矿床成为与浅成酸性岩浆岩有关的矽卡岩型找矿标志主要有:矽卡岩化发育;围岩蚀变标志以矽卡岩化、大理岩化为主,绢云母化、绿泥石化、孔雀石化、黄铁矿化、硅化是寻找金矿和铜、钼、银的近矿围岩蚀变标志。     

鲁苏皖一带基性—超基性岩中金刚石特征及其成因分析

鲁苏皖一带发现的呈串珠状含金刚石基性—超基性岩体,其金刚石成因是否相同?该文通过对比分析基性岩中与典型金伯利岩中产出的金刚石在晶体形态、粒径、晶面蚀像、金刚石类型等差异性,金刚石含矿母岩对比研究,金刚石在容矿岩石中分布,分析总结鲁苏皖一带基性超基性岩中金刚石的成因。超基性金伯利岩中金刚石成因为地幔捕掳晶成因,基性岩中金刚石多为岩浆结晶成因。     

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature.     

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 comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail     

Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo-     

Hydraulics and Hydrology in Mountain Areas

<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.     

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.     

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.     

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