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赛乌素金矿床氧化带从上至下可划分为碳酸盐亚带、高价铁质亚带、黄褐色花岗岩（粘土）亚带、浅灰色花岗岩（粘土）亚带等四个亚带和其下的原生硫化物石英脉带。氧化带中金以自然金或银金矿微粒存在。根据对氧化带剖面系统采集的６３个样品中元素相关分析，１９种元素可分出７个次生地球化学行为组。在垂直方向上，以Ａｕ为代表的第一组和以Ａｇ为代表的第二组元素在氧化带中出现“双峰”富集现象，这对于地表找矿中异常解释及氧化带深部评价具有重要意义。 相似文献
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贵州克脚剖面二叠系－三叠系界线附近地层连续,露头良好,长兴期菊石动物群化石丰富.根据该剖面大隆组－大冶组底部菊石化石的分布,自下而上划分出３个菊石带:HuananocerasＧTapashanites 带(第２２~３２层)、PseudotirolitesＧPleuronodoＧceras 带(第 ３３~７０ 层)、HypophicerasＧOphiceras 带 (第 ７２~７４ 层).对 该 剖 面 菊 石 带 划 分 及 区 域 对 比 表 明,HuananocerasＧTapashanites 带的时代为长兴期早期,PseudotirolitesPleuronodoceras 带为长兴期晚期,HypophicerasＧOphiceras 带为长兴期末期－印度期早期.另外,对华南二叠系－三叠系界线地层序列的区域对比,以及克脚剖面菊石标准化石的分布表明,克脚剖面第７１层的灰白色黏土岩和顶部的黑色泥岩,分别相当于煤山剖面第２５层和第２６层;第７２~７４层的泥质灰岩,相当于煤山剖面第２７;第７５层的灰白色黏土岩,相当于煤山剖面第２８层.同时,剖面第７３层产菊石Ophicerassp．,是三叠纪的标准化石,因此,本剖面二叠系－三叠系界线位于第７２层内部(第７２层共厚２０cm). 相似文献
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１８８２年李希霍芬在太原西山建立石炭系的太原系含煤建造以来，石炭系与二叠系的分界意见，归纳起来有三：①以Ｐｓｅｕｄｏｓｃｈｗａｇｅｒｉｎａ（ｓ．１）带之底为界，下面为石炭系，上面为二叠系；②以晋东南的灰白色“佳祥砂岩”与太原西山黄绿色“骆驼脖子砂岩”对比，砂岩底面为石炭系与二叠系的分界线，下面是石炭系山西组，上面是二叠系石盒子组，山西组的地层时代定为晚石炭世；③以晋东南灰白色第三砂岩（陵川砂岩）与太原西山“北岔沟砂岩”对比，砂岩底面为石炭系与二叠系的分界线，下面是石炭系太原组，上面是二叠系山西组，山西组的地层时代为早二叠世。笔者认为石炭系与二叠系的划分，以第③方案较适宜。 相似文献
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凉亭金矿产于信阳群龟山组上部以绢云石英片岩、碳质绢云石英片岩为主的第四岩性段内，严格受东西向构造破碎带控制。破碎带蚀变强烈、种类繁多，与矿化关系密切的有硅化、绢云母化、褐铁矿化，深部有黄铁矿化等。矿化带原生晕表现为高背景值、强异常的特征。Ａｇ、Ａｓ、Ｐｂ、Ｍｏ、Ｂｉ标型元素与Ａｕ密切相关。本文着重讨论最佳指示元素在不同地层中分布规律、蚀变与矿化富集、原生异常与矿化（体）的关系等，同时建立指示元素的垂直和水平侧向分带序列。 相似文献
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作为油气中有机组分残留在地层水中的直接显示，研究地层水中烃类的地球化学特征对分析油气的沉积环境、生源母质、成熟度等具有重要参考意义。通过对西湖凹陷古近系平湖组和花港组地层水萃取烃类分析后发现:烃类来源于氧化环境下的陆源有机质输入，现均已达到成熟-高成熟阶段。其中黄岩构造带、天台构造带和西次凹的烃类以来自黏土矿物含量颇为丰富的泥岩为主，而平湖斜坡带的源岩缺乏黏土矿物，更可能以煤为主。天台构造带的地层水中烃类很特殊，其姥植比异常高，二萜类具有蕨类植物和裸子植物双重贡献的特征，不同于其他构造带的二萜类以裸子植物来源的特点。进一步研究发现天台构造带原油的姥植比和二萜类特征与其地层水一致，同样具有特殊性，且多种芳烃地球化学参数也均不同于其他构造带，因此推断天台构造带的原油是不同于其他构造带的特殊类型。天台构造带地层水中烃类的特殊性是推断其原油为特殊类型的有力入口，对进一步研究天台构造带的特殊原油提供了指示意义。 相似文献
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广西宝坛锡多金属矿田的发现，始于６０年代。广西区调队三分队在桂北罗城幅１：２０万填图时，由颜北海等人于１９６７年５月在宝坛乡一洞附近的中元古界四堡群北东向断裂带中首次发现锡铜矿脉和含镍超基性岩体。同年６月，广西第九地质队马富君带组进入该区，揭开了矿田勘查的序幕。经广西第九地质队（１９８０年并入广西第七地质队，１９６７～１９８８）、广西石油地质大队（１９８９～１９９０）的２３年勘查和发现，探明了大、中、小型锡、锡铜、铜镍矿床１０余处，提交了地质报告和科研报告约２０余份，为在桂北建立新兴锡多金属工业基地提供了科学依据。为此，广西第七地质队荣获地矿部１９８７年度找矿成果二等奖。目前地方上已建成一批矿山正在开发利用。 相似文献
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四川盆地以东的复杂构造变形带拥有巨大的页岩气资源潜力，但目前勘探开发不足。为了支撑复杂构造变形带的页岩气勘探开发，针对复杂构造变形带内正安地区五峰组-龙马溪组页岩钻井岩心，开展了矿物学、有机地球化学、岩石学分析测试，探讨了页岩储层特征及主控因素。正安地区五峰组-龙马溪组页岩储层石英质量分数高达60%~80%，以硅质页岩为主，脆性程度高。石英主要是无机成因，包括原生碎屑石英沉积和黏土矿物转化而成的次生石英。原生碎屑石英、层状黏土颗粒的压实脆裂增大了孔隙空间，但次生石英的沉淀、充填减小了矿物颗粒间的骨架孔隙。正安地区五峰组-龙马溪组页岩储层总w（TOC）高达5.8%，有机质中无定形腐泥组大于80%，沥青反射率介于2.6%~3.1%，有机质热解而成的有机孔显著增大了孔隙度，但有机孔隙后期遭受构造挤压变形，多坍塌成狭长的多边形。 相似文献
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镇旬盆地金矿地质特征及找矿方向 总被引：5，自引：3，他引：2
镇-旬盆地金鸡岭向斜南北两翼是秦岭板块内重要的成金区域。区内金矿类型有三种：金龙山细碎屑岩-碳酸盐岩型、二台子钠长石角砾岩型、牛家沟石英脉-蚀变岩型。主要载金矿物为黄铁矿、含砷黄铁矿、黄铜矿、毒砂、石英、方解石等。金以自然金为主，次有含银自然金。本区含矿地层主要为中泥盆统古道岭组（D2g）、上泥盆统南羊山组（D3n）、星红铺组（D3x）和下石碳统袁家沟组（C1y）。近东西向的剪切破碎带直接控制矿体的分布。蚀变以黄铁矿化、黄铜矿化、毒砂矿化、汞锑矿化、硅化、方解石化等为主。Au，As，Sb，Hg元素组合直接指示金矿床的存在。分析镇-旬盆地金鸡岭复式向斜南北两翼成矿条件．得出在北带金龙山-丘岭金矿带东延的西坡岭-丁家山背斜带；中带的泗峡口-二天门带；南带的仁河口-公馆-回龙复背斜汞锑矿带；是成金的有利区域。 相似文献
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三峡水库蓄水后,库区岸坡的消落带岩土体在库水周期性升降的作用下处于一种“干燥-浸湿”的循环状态。这种干湿循环作用将造成岩土体强度的劣化,并且随着劣化效应的增加,引起岸坡失稳,进而引发严重的地质灾害。以三峡库区巴东县巴东组第二段和第四段软岩为研究对象,在详细的野外调研基础之上,通过不同干湿循环次数下的软岩抗剪强度试验,模拟库水升降对软岩的水岩相互作用过程,探讨了巴东组软岩受库水“干燥-浸湿”循环作用下抗剪强度的劣化规律,利用X射线衍射方法对软岩的矿物成分进行分析,探讨消落带软岩的风化崩解机理。研究发现,巴东组第二段和第四段软岩分别在经历第1次和第3到5次干湿循环时,抗剪强度发生严重劣化;第二段软岩抗剪强度的劣化是由于蒙脱石遇水膨胀造成,第四段软岩抗剪强度的劣化是由于岩石中楔裂压力的发展造成。研究结果可以为岸坡稳定性评价提供理论依据。 相似文献
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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. 相似文献
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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. 相似文献
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《极地研究(英文版)》2014,(3)
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 相似文献
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《山地科学学报》2014,(4):I0004-I0009
<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. 相似文献
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《山地科学学报》2014,(4)
<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 相似文献
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References： 《极地研究(英文版)》2007,18(1):73-83
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. 相似文献
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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. 相似文献