沈阳陨石——对超基性岩体的新认识

沈阳陨石曾被前人认为是超基性岩体.笔者通过对岩体的宏观地质特征、矿物成分和组构、同位素年龄等研究,认为分布在沈阳附近的馒首山、东滑石台和前老塘峪超基性岩应是非视落无球粒陨石.陨石表面年龄为4370Ma,陨落时间大约在1880Ma左右.     

辽宁南部菱镁矿和滑石矿陨落成因的认识

辽宁省南部菱镁矿—滑石矿床成因与硅镁质石陨石陨落作用有关,它们相互依存、相互制约,成群成带分布于早元古代大石桥组三岩段碳酸盐岩中,受同一含矿层位控制,具有品位高,厚度大,矿物成分简单的特点。根据地球化学热力学原理,组成矿床的主要成分SiO_2和MgO,主要来自硅镁质石陨石的镁橄榄石和顽火辉石。当石陨石陨落和撞击地壳时,在SiO_2—MgO—H_2O相系中生成滑石,在MgO—CaO—CO_2相系中生成白云石和菱镁矿。因此,辽宁南部菱镁矿—滑石矿床成矿物质来源于陨落;陨落作用提供了成矿能量;陨击坑或由陨落作用形成的洼陷区为成矿提供了空间成矿的场所。     

沈丘球粒陨石考察研究

1987年2月22日3时25分,在河南省沈丘县老城镇一带陨落了一次陨石。已收集到两块:杨洼(1号)陨石重14.25公斤,入地深度38厘米;魏营(2号)陨石重76.7克,比重3.64,微磁性。经实物对比,二者皆为灰褐色、有熔壳,原应为一体之物。用2号样化验分析,已发现27种化学元素。镜下鉴定见有:辉石、橄榄石、金属铁-镍、陨硫铁、铬铁矿及玻璃质矿物等。硅酸盐部分(80.02％)大于金属部分(19.97％)应属石陨石大类。因陨石中矿物球粒状结构明显,故称球粒陨石。总观沈丘陨石特征,可命名为:橄榄古铜辉石球粒陨石。与1977年12月1日,陨落在河南信阳的球粒陨石相比,矿物成分和结构等都大同小异。     

雏议山东境内陨石

1有关陨石的记载 陨石亦称陨星、流星。陨者,落也。陨石泛指宇宙天体在运行中撞击陨落进入地球引力范围,穿过大气层未被完全烧毁而降落到地面的残块或整块的太空物。陨石是不可多得的天体标本,带来许多宇宙空间的珍贵信息,为人类探索宇宙奥秘,研究天体演化和生命起源提供重要的科学情报。航天、军工、科研、博物馆等单位都逐步开展了对陨石的普查、收集、研究、陈列展示及科学普及工作,并取得了一定成果。     

沈阳滑石台山超镁铁质岩同位素测年

沈阳市东南部滑石台山附近太古代花岗岩基底中零星分布的超镁铁质岩地质体，经同位素测年，Ｒｂ／Ｓｒ表面年龄４３７０Ｍａ，全岩Ｒｂ／Ｓｒ等时线年龄４６９２±１８４Ｍａ，全岩Ｐｂ／Ｐｂ等时线年龄４５３５±￣（１０８）＿（１１７）Ｍａ。因此，作者认为滑石台山、馒首山、金顶山等地的超镁铁质岩是陨落成因，陨落地质作用发生在１８─１９亿年前。     

雏议山东境内陨石

1 有关陨石的记载 　　陨石亦称陨星、流星.陨者,落也.陨石泛指宇宙天体在运行中撞击陨落进入地球引力范围,穿过大气层未被完全烧毁而降落到地面的残块或整块的太空物.陨石是不可多得的天体标本,带来许多宇宙空间的珍贵信息,为人类探索宇宙奥秘,研究天体演化和生命起源提供重要的科学情报.航天、军工、科研、博物馆等单位都逐步开展了对陨石的普查、收集、研究、陈列展示及科学普及工作,并取得了一定成果.……     

靖西鹅泉·岩溶山麓的“天下第一净水”

正靖西是广西一个风光秀丽的边城,在这里,壮族不是少数民族,常住人口中90%以上是壮族人。靖西的鹅泉与云南大理的蝴蝶泉、广西桂平西山的乳泉并称为中国西南三大名泉。趁着来靖西出差,我们慕名前往。鹅泉又名灵泉,它位于靖西城区西南6 000米外的小鹅山麓,一路上侧面或迎面,总有群山排列,向人们展示它们的婀娜多姿。峰丛谷地中的泉湖鱼趣靖西的山很多,但不成山脉,以岩溶低山     

“八五”广西1∶5万区调取得的新进展

“八五”广西１∶５万区调取得的新进展广西地质调查研究院黄志强“八五”期间，广西所承担的１∶５万区调工作中，在地层、岩石、构造等方面取得许多新进展，现分述如下。１地层１．１中—晚元古代１．桂北三防—滚贝地区，进一步查明了岩石地层序列，中元古界四堡群可细...     

<中国及有关冈瓦纳地块的构造演化和地质动力学学术讨论会>广西地质考察简况

1999年 10月中旬 ,国际地质对比计划第 36 8项、4 11项与 4 4 0项目在我国宜昌举行学术讨论会 ,会议由中科院地质研究所和中国地质大学有关部门筹办 ,着重介绍与交流了近年云南、广西等中越毗粼地区及东南亚地区大地构造研究的新进展 ,会后进行了野外地质考察 ,重点地区在云南麻粟坡、西畴、富宁和广西那坡、靖西一带 ,路线考察学术领队由中科院地质所吴根耀研究员和广西地调院邝国敦高工担任。考察日程 10月15～ 19日 ,历时 5天。前 3天考察云南 ,后两天考察广西。10月 18日 ,按原定计划考察团到达那坡。考察团成员有中科院地质研究所、中…     

华夏瑰宝——玻璃陨石雷公墨

正广泛散布于我国广东湛江—茂名地区,广西玉林—南宁—百色地区,海南全岛,云南文山—红河一带,以及东南亚、澳大利等地的天然玻璃——雷公墨,属重要的宝石玉石资源,还为具有80多万年悠久历史的广西百色地区旧石器时代人类文明考古的年代测定做出了突出贡献。随着人们文化生活水平的不断提升,雷公墨日益受到市场青睐,而成为宝石玉石界的新宠。翻开唐代伟大药物学家陈藏器在1 280年前撰成的《本草拾遗》,可了解雷公墨文化的创造渊源。一、雷公墨载入唐代药典《本草拾遗》     

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.     

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     

Relationship of Arctic sea ice and Northern Hemispheric 500 hPa Polar vortices

Using the NCEP/NCAR reanalysis monthly 500 hPa height data on a 2.5 latitude-longitude grid and 1°×1° sea ice data,the polar vortex area,intensity index and arctic sea ice area index are calculated respectively,and the meridional distribution,period variation and the abrupts in the long range trend are analyzed to study their relationship.The results show that the meridional distribution of sea ice and polar vortex h-ave distinctive difference,the relative positions of them are different in the eastern and western hemispheres,and exept they have periods of 4 months,quasi half year,quasi year,4-5 years and 10 years commonly,and each of them has its own respective variation as well.The sea ice area is decreasing apparently since 1980's,so is the polar vortex area,but their abrupt changge time are different totally.The area of sea ice and polar vortex has prominent positive correlation,but the relationship of sea ice intensity,polar vortex intensity,polar vortex area is complicated.     

Author Index for Journal of Mountain Science Volume 11,2014,pp 1-1656

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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