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北秦岭的小寨组、柿树园组和粉笔沟组为同属一套地层,它们是在加里东褶皱带的基础上形成晚古生代泥盆纪冒地槽的深水相复理石建造,在泥盆纪末,地槽褶皱回返,开始形成了一个海西褶皱带。 相似文献
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一、基本地质特征
本区位于兴安岭—内蒙地槽褶皱区的东部,伊春—延寿地槽褶皱系的北段,结晶基底为下元古界东风山群含电气石的高绿片岩相—低角闪岩相变质岩群。下寒武统西林群铅山组海相镁质碳酸盐岩建造是早期盖层。在矿区及周边地区有多期次花岗岩类侵入,特别是加里东中期和印支期花岗岩的出露与分布。古生界地层常呈捕虏体出现,与成矿有关的寒武系下统铅山组地层,出露面积很小,区域内不足10km^2。 相似文献
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研究区位于兴安岭一内蒙地槽褶皱区大兴安岭地槽褶皱系兴隆沟冒地槽褶皱带之宝泉沟褶皱束和旁开门中断陷之西部。北部毗邻额尔古纳地块,南部与罕达气优地槽褶皱带相连。区内最古老的地层为早元古界兴华渡口群兴华组,近东西向展布,为一套变质较深、混合岩化作用强烈的变质岩系,构成区内的古老陆壳,是区内金矿的物源之一。古生代泥鳅河组地层是北西向的嘎鲁河向斜延伸到四、五道沟翘起部分,向斜的翼部被后期侵入体侵入得肢离破碎。四道沟东、西山两个金矿点即赋存在向斜的核部和翼部。 相似文献
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一、成矿地质背景 断陷区位于兴蒙地槽褶皱区北东端,额尔古纳地块南段。属古亚洲构造域与滨太平洋构造域迭置区,主要经历了原始古陆核和大陆形成及滨太平洋大陆边缘活动两大阶段。1.地层与戍矿断陷区经历了古陆核形成演化和滨太平洋大陆边缘活动两大阶段。在早元古代与晚元古代,该区处于古陆核边缘活动带,形成了巨厚的优地槽型沉积建造,即下元古界兴华渡口群兴华组和上元古界倭勒根群吉祥沟组、大网子组,以兴华组地层分布居多,为一套古老变质岩系的片岩、片麻岩类。 相似文献
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河南金矿主要分布在小秦岭地区,其次是桐柏山、崤山─熊耳山地区。含矿地层为前寒武纪的片麻岩-混合岩、片岩-变粒岩和轻微变质的绿片岩,原岩皆属中基性火山岩夹火山沉积岩;控矿构造以近东西向和北东向为主,与成矿关系密切的岩浆岩主要是燕山期花岗岩及有关脉岩。本文拟从地层、构造、岩浆岩控矿特点入手,通过金矿的成矿机制试图揭示小秦岭─桐柏山地区金矿成矿模式。 相似文献
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一、区域地质演化本区属于内蒙一大兴安岭地槽褶皱系的中段,由内蒙优地槽褶皱带和大兴安岭优地槽褶皱带组成,这两个大地构造单元,在晚古生代基本上属于两个性质相近的地质发展区。本区的地质构造条件,决定了其地热资源沿主要断裂构造出露并受其控制的地热温泉,并以热泉的形式直接出露地表,可开发的地段限于在地表有地热显示及其相关构造分布的地区,其分布受地质构造的控制,地热资源靠循环于断裂带中的地热水所提供。 相似文献
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南湾湖属于位于秦岭一昆仑东西复杂构造带之南亚带东延部分与淮阳山字型步弧两翼衔接地带。东西向构造在本区起控制和主导作用,地质土与南湾水库较密切的是片麻岩,片岩岩组和第四系松软组。水库坝址地层为震旦系,下古生界信阳群龟山组是—套浅变质岩系,石英云母片岩,铁质云母,炭质云母,其次为少量中生代晚期侵入的火山岩,第四系松软堆积物。 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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《中国海洋大学学报(英文版)》2014,(3):I0001-I0001
<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 相似文献