天然变形岩石中的白云母压象

天然变形岩石中白云母压象见于丹东市四道沟金矿区元古宙变质沉积岩,即变质长石石英砂岩的糜棱岩中。在白云母压象中,相邻两组裂理交角约为60°,其中一组裂理平行于白云母光轴面,另外两组则与光轴面斜交。白云母压象形成于韧性剪切带初始活动阶段,时间上早于石英中广泛的亚晶化及动态重结晶作用阶段,其形成的温度、压力条件大致相当于下部绿片岩相,即温度在300—400℃左右,压力0.2—0.5GPa,形成时应变速率参考值不小于10~(-13)S~(-1)。     

山东省平度地区下元古界荆山群变质作用特征

胶北隆起新建荆山群,处于胶东群之上,暂置于粉子山群之下;为一套不稳定至半稳定型浅海相陆源碎屑(底部有少量火山碎屑)夹碳酸盐岩的类复理石建造,经过多期变质作用达到角闪麻粒岩相的变质沉积岩系。变质矿物共生组合和各世代矿物的相互关系显示该套岩系经历了四期变质作用。单矿物化学成分及地质温压计等定量估算出各期变质作用的P—T条件: 第一期变质作用相当于角闪麻粒岩相条件,t=780～817℃,p=0.5GPa±,fo_2=10~(-15.5) 第二期变质作用相当于高角闪岩相条件,t=630～690℃,p=0.4GPa±。第三期变质大致为低角闪岩相,t=525℃±。第四期变质相当于绿片岩相条件,t<400℃。     

胶南造山带变质作用及其演化

胶南造山带曾经历过五期变质作用：早中元古代麻粒岩相变质作用，以出现紫苏辉石为标志，其变质条件为P＝1．35GPa、T＝787．7℃，属中高压相系、区域中高温变质作用；晋宁期榴辉岩相变质作用，以发育榴辉岩为标志，其变质条件P≥2．8GPa、T＝601～1375℃，属超高压变质作用，榴辉岩围岩的变质条件为P＝1．1～1．6GPa、T＝560～650℃；晋宁一震旦期的角闪岩相变质作用是胶南造山带最重要的一次热动力事件，其形成条件早期为P＝0．311～0．314GPa、T＝564．5～603．3℃，中期为P＝0．25～0．644GPa、T≤700℃，晚期为P＝0.545～0．644GPa、T＝600．7～670．8℃，角闪岩相变质作用的P—T演化趋势线呈顺时针方向的半环状，这种P—T趋势与该区的岩浆活动有关；加里东期的中高压绿片岩相变质作用，以广泛分布的3T型多硅白云母为标志，其形成条件为P＝0．70～0．85GPa、T＝450～510℃，属高温低压变质作用；印支期的低绿片岩相变质作用是区内最晚期的低温动力变质作用，呈带状产出，与韧性或脆韧性剪切带相伴分布，其形成温度为350～447℃。     

威海北部古元古代岩石地层──荆山岩群

出露于威海北部的古元古界荆山岩群，呈包体状零散分布在新元古代晋宁期荣成超单元中，经过区域对比，可将其划分为3个岩组共6个岩段。麻粒岩、石榴夕线黑云片岩、堇青石榴夕线黑云片岩、方镁石镁橄榄石大理岩及透辉石镁橄榄石大理岩等是荆山岩群经历过麻粒岩相变质作用形成的指示性岩石（组合）。麻粒岩相变质作用分为3个阶段：早期阶段T=550～600℃，P=0．2～0．55GPa，地热梯度平均38℃／km；峰期阶段T=700～820℃，P=0．71～1．0GPa，地热梯度平均26℃／km；晚期阶段T＜700℃，P=0．65GPa，地热梯度30℃／km。属低压区域变质相系。PT轨迹总体呈逆时针形式，表明本区麻粒岩相变质作用发生的大地构造环境靠近大陆边缘的岛弧区。     

河南临汝安沟地区前嵩山群变质作用

河南临汝安沟地区前嵩山群变质矿物、变质矿物组合以及变质温压条件研究表明,前嵩山群分属不同的变质建造,其中安沟群属中压相系绿片岩相变质作用,登封群头道河组为中压相系角闪岩相。同时,两套地层变质作用之间缺少钠长—绿帘角闪岩相,这一变质作用的间断,从一个侧面反映了地层的间断。     

坪上一带深层次构造岩的变形特征及温压条件分析

山东坪上一带深层次构造岩发育 ,依其塑性变形矿物及其组合、同构造新晶和同构造变形晶所反映的变形特征的不同可分为石英变形相构造岩、钾长石变形相构造岩和斜长石变形相构造岩 ,其变形时的温压条件为中压相系的低绿片岩相—低角闪岩相     

温压条件对非饱和低渗透砂岩中CH4突破压力影响的实验研究

突破压力在气藏开采和盖层封闭性评价中起着重要的作用。为模拟地层温度压力变化对低渗透性砂岩中CH₄突破压力的影响,采用逐步法对取自鄂尔多斯盆地早二叠世非饱和低渗透砂岩,进行了不同温压组合条件下的CH₄突破压力实验。结果表明:随着温度或压力的升高,CH₄突破压力和突破时间均呈下降趋势,且压力变化对CH₄突破过程的影响更加显著。分析发现,温度压力对CH₄突破压力的影响,是由于温压变化改变了界面张力和接触角的大小,进而控制突破压力的大小;另外,突破压力随着两相黏度比的增大而减小,且温度压力越高,黏度比对突破压力的影响越小。因此,实验温压范围内,对于非饱和低渗透砂岩储层,温度和压力越高越有利于气藏开采;对于非饱和低渗透砂岩盖层,温度和压力越低,盖层封闭性越好且越安全。      

南秦岭构造带十堰—武当地区岩石变质作用

十堰—武当地区位于南秦岭构造带和扬子板块的结合部位,内部发育的变质岩可为秦岭造山带印支期造山过程提供重要信息。在该地区含石榴子石片岩的岩石学、矿物学研究基础上,利用石榴子石-黑云母地质温度计和石榴子石-白云母地质温度计计算变质作用条件。结果表明:石榴子石-黑云母地质温度计计算得到方滩—王家山剖面南、北两侧变质岩的主期变质温度分别为344℃~410℃和368℃~431℃,属于低绿片岩相;由石榴子石-白云母地质温度计计算得到十堰—大木剖面南、北两侧变质岩主期变质温度分别为322℃~440℃和535℃~540℃,属于低—高绿片岩相。结合区域变质变形研究成果,认为十堰—武当地区中低级变质岩的变质作用演化与南秦岭构造带印支期洋盆闭合伴生的俯冲-增生过程有关,它使得不同变质级别的岩石发生并置然后一起抬升。     

辽南早元古代花岗岩的变形温度及其构造意义

辽南早元古代辽河群中片麻状花岗岩的变形温度显示出645—690℃,550—610℃和485℃±三组温度值,表明花岗岩遭受了三幕构造变形。而区域构造解析亦表明辽河群在早元古时期经历了三幕构造变动。花岗岩的温度系列与区域变形序列具有一致性,排除了花岗岩晚期构造侵位的可能性。变形温度以550—610℃居多,意味着该幕构造形迹保存最好。第三幕变形变质作用相对较弱,仅局部出现485℃的温度值。     

坪上一带深层次构造岩的变形特征及温压条件分析

山东坪上一带深层次构造岩发育,依其塑性变形矿物及其组合、同构造新晶和同构造变形晶所反映的变形特征的不同可分为石英变形相构造岩、钾长石变形相构造岩和斜长石变形相构造岩,其变形时的温压条件为中压相系的低绿片岩相-低角闪岩相.     

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.     

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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     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<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     

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 results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo-     

Hydraulics and Hydrology in Mountain Areas

<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     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

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.     

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