贵州遵义铝土矿(带)成矿条件及成因分析

根据已取得的地质成果,应用现代沉积学的理论与方法,对贵州遵义铝土矿(带)成矿条件及成因进行了分析。认为铝土矿的形成,是在古生代碳酸盐岩所形成的古岩溶基底上,于有利的古构造、古地理、古气候等先决条件下,以白云岩和页岩为成矿原岩风化剥蚀的残坡积物,经钙红土化、红土化的成矿作用,脱硅去铁、脱钙去镁、脱钾富铝后,成为红土型铝土矿;随着早石炭世海侵的到来,不断发生水解作用,同时经水体短距离搬运再沉积在古岩溶坑洼内,形成三水型铝土矿;尔后盖层加厚,增温脱水,进而形成一水硬铝石型铝土矿床。矿床成因类型属古风化壳型岩溶坑洼异地沉积一水硬铝石铝土矿床;其成矿时代归属早石炭世大塘期旧司时。      

秦岭东段金红石矿床成因类型地球化学特征及分布规律

秦岭东段金红石矿床分为区域变质、岩浆、热液、风化及沉积五大成因类型。正变质型矿床,常量元素与钙碱性—碱性、基性岩浆岩接近,ＴｉＯ２与ＳｉＯ２呈负相关;稀土元素分布模式由轻稀土富集型渐变为亏损型。副变质型矿床,常量元素与粘土岩接近,ＴｉＯ２与ＳｉＯ２、ΣＲＥＥ等呈正相关;与ＣａＯ、ＭｇＯ等呈负相关。岩浆型矿床,常量元素与超基性岩接近,ＴｉＯ２与Ａｌ２Ｏ３、（Ｌａ／Ｌｕ）Ｎ等呈正相关。热液脉型矿床稀土元素分布模式与母矿床相同。矿床沿深大断裂分布,均位于变质岩区。成矿时代为晚元古代、泥盆纪及第四纪。正变质型矿床一般共生有风化、沉积及热液脉型矿床。成矿机制主要为扬子板块向北两次较大规模的俯冲所致。     

黎塘碳酸盐岩红土风化壳形成的地球化学过程演绎

黎塘碳酸盐岩的红土风化壳成熟度较高，赋存有牧厚的高钦三水型铝土矿。本文分析了红土风化壳分布的地貌单元与碳酸盐岩之间在化学成分和矿物组成上呈渐变关系，认为三水型铝土矿是碳酸盐岩不溶残渣在原地经红土化作用的产物。还通过一个挖穿风化壳的浅井系统采集样品化学分析资料，并与在风化条件下相对稳定的化学组分Ａｌ＿２Ｏ＿３进行对比，计算出基岩与风化壳各层之间的组分得失率及其活动顺序，进而推断红土风化壳形成的物理化学条件和地球化学过程，对该区高铁三水型铝土矿的成因、物质来源和指导找矿具有实际意义。     

试论靖西岩溶堆积型铝土矿矿床成因及其控矿因素

靖西岩溶堆积型铝土矿是原生沉积铝土矿在强烈的岩溶发展过程中形成的一种次生沉积改造矿床,主要赋存于岩溶洼地的红土层中,具有矿床规模大、矿石质量优等特点。矿床成因与岩溶作用、红土化作用息息相关,成矿受矿源层、地层岩性、构造、气候、地貌等因素控制。     

青海省锡铁山铅锌矿成矿元素物质场结构及深部找矿潜力

青海省柴达木盆地北缘锡铁山铅锌矿是我国大型的喷流沉积型(SEDEX)矿床，赋矿围岩主要是大理岩和片岩，浅部主要为大理岩型矿体，深部主要为片岩型矿体。系统描述了不同矿石类型中铅锌矿体与黄铁矿的空间共生关系、矿体空间形态三维变化规律；利用局部奇异性分析方法、相关性分析方法对矿区Pb、Zn、Ag、Au等成矿元素物质场结构特征及变化趋势进行了系统分析，2种分析方法均可表现元素物质场不同的结构特征，即:Pb、Zn、Au元素整体上沿着矿体的侧伏方向仍然有明显的向深部富集的趋势，且不受大理岩的影响，在片岩中物质场所反映的元素富集程度依然很强；Ag元素整体上从浅部到深部在矿化空间内均有明显的不连续富集特征。锡铁山铅锌矿水平方向上元素分带由远至近(由西向东)依次为Mn-Fe-S-Ag-Pb-Zn-S-Au，垂向上元素分带由上到下依次为Mn-S-Ag-Pb-Zn-S-Au，同时系统研究了成矿元素物质场中元素富集结构的变化规律，分析讨论了锡铁山深部找矿潜力。      

广西岩溶型矿床类型及其特征

本文首先简介了岩溶型矿床概念和广西岩溶型矿床研究现状之后，着重论述了广西岩溶型矿床类型的划分及其特征，共分为＂岩溶矿床＂、＂与岩溶有关的矿床＂两大类和沉积、堆积、淋积、充填交代型与洼地沉积、洼地洞穴堆积、洞穴储集型等七个亚类，并分述了各亚类矿床的特征，涉及矿种有铁、锰、铝、铅锌、锡、金、磷、滑石、重晶石、水晶、粘土和油气等矿产；还探讨了广西地史中岩溶发育不同阶段的成矿作用特征，指出：晚古生代阶段发育以与岩溶有关的矿床为主，中生代阶段以充填交代型岩溶矿床为主，而在新生代阶段则以沉积、堆积、淋积型岩溶矿床为主，并认为必须以岩溶成矿观点、以岩性、构造等诸因素为条件，可解释岩溶型矿床的成矿过程和成矿机理。     

再论河南G层铝土矿的物质来源

河南G层铝土矿的成矿物质来源至今尚未取得一致意见。本文从岩溶型铝土矿床的时空分布,铝硅酸盐造岩矿物在风化壳发育过程中的演化顺序,富铝风化壳发育的地形、岩性条件及现代实例等新的角度对该问题进行了探讨。提出整个本溪组含矿岩系物质来源为多元,而铝土矿则以基底碳酸盐岩为主的观点。     

广东茂名地区二叠纪层状硅质岩成因地球化学特征及其沉积环境意义

在广东茂名地区二叠系地层中存在与地层整合产出的层状硅质岩。硅质岩富Ｆｅ、Ｍｎ，相对贫Ａｌ；富集Ａｓ、Ｓｂ、Ｂｉ，Ｇａ等微量元素；稀土元素总量低，Ｃｅ弱负异常，重稀土相对富集；δ３０Ｓｉ值变化范围为０．０００３～０．０００７，δ１８Ｏ值变化范围为０．０１４８～０．０２２３，均具热水沉积硅质岩的地球化学特征。在Ａｌ－Ｆｅ－Ｍｎ和Ｆｅ－Ｍｎ－（Ｎｉ＋Ｃｏ＋Ｃｕ）三角图上，本区硅质岩均属于典型的热水沉积硅质岩。硅质岩ＭｎＯ／ＴｉＯ２比值、δＣｅ值和δ３０Ｓｉ值分析表明，本区展状硅质岩主要是在大陆边缘的浅海环境下沉积的。     

娄烦县新开铝土矿矿床地质特征及成因浅析

通过对娄烦县新开铝土矿区地质特征及矿床特征的研究,及对其矿床成因分析,可知,该铝土矿位于奥陶系碳酸盐岩侵蚀面上的一水硬铝石沉积铝土矿矿床,即我国华北地区统称的G层铝土矿;含矿岩系为石炭系中统本溪组一段;成矿物质主要来源于基底的碳酸盐岩风化残积物钙红土,经沉积成矿;娄烦新开铝土矿床为一矿体厚度中等、品位较好的小型铝土矿床.     

浅谈平果残积层状铝土矿地质特征及工业价值

残积层状铝土矿是原生沉积型铝土矿在岩溶发展过程中残留下来,经风化、淋滤脱硫后在地表氧化带形成低硫高铁型工业矿体。矿体规模较大,储量可观,矿石块度大,含泥率低,易脱泥,矿石质量优良,具有较高的经济价值。     

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.     

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.     

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

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