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1.
西乡胡家营处所见构造为北东向延展的断裂带,是由一系列上陡下缓向南东倾斜的走向断层组(其间夹持的牵引褶曲)配置于走向断层近于垂直的两组共轭横切断层之间,共同组成西乡胡家营地区典型的推覆体构造布局。从胡家营的推覆构造可推知汉南地块东南缘北东向构造带,应属于中生代以来所形成的推覆体构造。 相似文献
2.
阿尔金山的构造归属及其构造运动特征 总被引：5，自引：0，他引：5
伍跃中 《地球科学与环境学报》2008,30(2):111-117
通过对阿尔金山各边界断裂性质和阿尔金南缘断裂构造活动特点的系统分析,结合阿尔金山与南塔里木地块岩石建造组合特征进行比较,认为阿尔金山原属于南塔里木地块的组成部分,长城纪以后逐渐转化为南塔里木地块边缘活动带.其3条边界断裂分属于不同的断裂系统,具有各自不同的形成和演化历史.阿尔金南缘断裂活动的力学性质、运动方向具有多级周期性反复的特点,较好地揭示了阿尔金地块地壳波浪状构造演化特征. 相似文献
3.
利用离散小波变换获得青藏高原布格重力异常不同尺度的总水平梯度(HGM)和横向、纵向、对角分量平方和的平方根(HVDM)图像。结果表明:1)4、5阶小波细节之和的HGM高值区域存在于尼泊尔喜马拉雅地区、喜马拉雅东构造结和阿尔金断裂带中段,即青藏高原周缘较为活跃的构造带;2)尼泊尔喜马拉雅地区和阿尔金断裂带西段存在5阶小波逼近高值HGM,较高值HGM带呈现环青藏高原形态,反映了青藏高原与周缘构造块体地壳深度变化和岩石圈地幔顶部物质性质的差异性变化特征;3)HVDM高值带分布于喜马拉雅地区、喜马拉雅东构造结地区、阿尔金断裂带和龙门山断裂带,体现了青藏高原周缘构造带形态特征;4)2015尼泊尔Ms8.1地震发生在地壳深部的HGM高-低-高分布形态的低值区和HVDM高值带的边界,是印度板块和欧亚板块持续汇聚及周缘大型走滑断裂带的调节作用、累积能量释放的结果。 相似文献
4.
对辽中凹陷南洼LD16油田走滑伴生构造特征及其控藏作用进行了分析。依据走滑断层和伴生断层的关系及其所在构造变形区所处的应力状态将研究区的构造类型划分为走滑主控断裂带挤压构造、走滑主控叠覆带伸展构造和走滑主控断裂带伸展构造3个次级构造单元。相比而言,走滑主控断裂带挤压构造发育挤压型的背斜圈闭,且遭受破坏作用小,成藏条件最为优越;走滑主控叠覆伸展构造发育多级拉张型断块圈闭,其伴生断层对油气的分配作用更为明显,具多层系油藏形成的特征,这两种构造类型均有利于油气的运聚,而走滑主控断裂带伸展构造聚油条件最差。 相似文献
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阿尔金断裂带中中新世以来构造变形的电子自旋共振测年证据 总被引：1，自引：0，他引：1
阿尔金断裂带新生代以来大规模活动的时限及规律一直是国内外研究的热点问题之一,但目前仍缺乏可靠的年代学约束。在野外地质调查基础上,对阿尔金断裂带中的伴生石英脉和石膏采用电子自旋共振(ESR)测年,并用测年结果约束断裂活动起始时间的下限,最后探讨了阿尔金断裂带中中新世以来的构造活动。结果表明:阿尔金断裂带新生代大规模构造变形始自中中新世((12.5±1.3)~(15.1±1.5)Ma),之后经历了多期次的构造变形活动;阿尔金主断裂开始大规模走滑活动的时限至少始于(15.1±1.5)Ma,而阿尔金北缘断裂挤压逆冲活动的时限至少始于(14.1±1.4)Ma;阿尔金断裂带的变形活动在其主体走滑和北缘逆冲之间存在时间差,推测其具有从中心向两侧渐进扩展的变形方式;深部的韧性剪切首先引起阿尔金主断裂的走滑位移,致使附近山体快速抬升,随后变形扩展并引起阿尔金北缘断裂逆冲活动的构造响应。 相似文献
6.
鲜水河断裂带的构造大地测量 总被引：2，自引：2，他引：0
利用短边GPS点阵、短基线标石阵和精密激光测距 ,在与鲜水河断裂带的断层破裂带垂直的剖面上和构造盆地内进行构造大地测量 ,获得了断层软弱带和断层蠕变带上的最佳形变分布。综合利用相关地学成果和理论 ,揭示了构造形变所隐含的动力学信息 ,识别了断层应变带、塑性流变带和主断面在地面的分布范围。用外围GPS远场联测成果探讨了该断裂带的驱动力机制 ,匡正了其“左旋”运动和现今活动速度的含义。最后 ,评估了该断裂的地震活动趋势 相似文献
7.
莱州湾凹陷垦利A区位于渤海湾盆地东南部,水平伸展应力和剪切应力共同作用致使该区东营组发育多组不同性质的断层组合,进而形成大量断块型圈闭。断层侧封定量评价对于研究断块圈闭的油气成藏意义重大,而传统方法在复杂的走滑-伸展应力背景下应用效果较差。从控圈断层性质分类入手,分析了不同性质断层断裂带内部结构的差异性,在明确断层侧封性影响因素的基础上针对不同性质断层优选不同评价方法。研究表明,控圈断层依据平面、剖面特征与活动强度的差异性,划分为走滑断层、走滑派生断层、拉张断层3类,其中走滑断层强大的水平位移对断裂带造成了严重破坏,断裂带结构复杂,对其侧封能力评价创新地采用了侧封指数来定量表征;拉张断层断裂带为三元型(由内往外分别为断层岩、滑动破碎带、诱导裂缝带),侧封主要受断裂带内断层岩影响,通过计算断层岩与储层的排替压力差来定量评价;走滑派生断层断裂带为二元型(由内往外分别为滑动破碎带、诱导裂缝带),侧封能力主要受岩性对置、泥岩涂抹等因素影响,利用模糊数学法进行定量评价。通过上述研究,最终建立了评价构造复杂、断层性质多样的区域断层侧封能力评价的方法体系,对进一步勘探具有指导意义。 相似文献
8.
在阿尔金地块南缘构造混杂岩带中,新发现了多个规模较大的斜长片麻岩块体。运用LA-ICP-MS锆石U-Pb定年分析方法,对阿尔金地块南缘且末大石门地区构造混杂岩带中的斜长片麻岩进行了年代学测定,并初步探讨其地质意义。30个锆石颗粒的28个有效测点,测出的年龄明显分为2个区间:①(1784±41)^(2150±34)Ma之间,加权平均值为(2130±27)Ma(MSWD=0.21,1σ);②(2324±32)^(2684±51)Ma之间,加权平均值为(2520±23)Ma(MSWD=0.06,1σ)。根据该次年龄测试结果和区域调查资料表明,阿尔金地块南缘且末大石门地区,在古元古代存在一期构造-热事件,该期事件与吕梁运动的时限相吻合。 相似文献
9.
丁渊洪 《地球科学与环境学报》1999,21(1):31-35
马超营断裂带为熊耳山南坡最大的ＮＷＷ向区域性大断裂。该断裂带由三条逆冲断层组成，对金矿的形成起了决定性控制作用，既是金矿的导矿构造，也是金矿的容矿构造。在马超营断裂两侧，金矿东西成带、北东成行等间距分布。矿体一般赋存于主断裂与Ⅱ级断裂的交汇处，在大断裂带中也有中小型矿体赋存。因此，进一步研究深大断裂带的控矿特征具有重要的找矿意义和理论意义。 相似文献
10.
通过对横切太后庙断层的三条剖面的研究,发现断层构造岩存在着明显的水平分带。在研究了太后庙断层下盘各构造岩带的化学成分,矿物成分、变形和重结晶特征及岩组图后,认为目前出露在断层下盘的各构造岩带是在不同深度、不同温度、不同的应力条件下形成的,这是由于断层多次活动,断层下盘不断抬升的结果。基于断层构造岩是断层活动历史的记录者这一指导思想,可知太后庙断层经历了应力积累—早期活动—相对平静—晚期活动—休眠五个阶段。结合本区地质发展史,认为两次活动阶段分别为燕山运动晚期和喜山运动早期。两次活动使嵩山地块抬升达6000米。 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
13.
《极地研究(英文版)》2014,(4)
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 相似文献
14.
《中国海洋大学学报(英文版)》2014,(4)
<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 相似文献
15.
《中国海洋大学学报(英文版)》2014,(6)
<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- 相似文献
16.
Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<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 相似文献
17.
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. 相似文献
18.
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
19.
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
20.
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 相似文献