二维地震勘探在伊南煤田伊昭井田的应用

在地震地质条件不利的情况下,确定了合理的野外数据采集方法;根据二维地震的目的任务,运用了合理的数据采集方法,采用了较好的技术措施解决了地震资料处理及解译中存在的技术难点,包括静校正问题、干扰波的去除、分辨率的提高、波组分析、层位标定、断点解释等。在覆盖层厚度、煤层底板、煤层露头、构造解释、火烧区推测等方面取得了较可靠的勘探成果,为后续全井田勘探布局发挥了指导性作用。     

深部隐伏沉积变质型铁矿床找矿模式初探——以苍山县沟西铁矿床为例

为验证苍山县沟西地区航磁局部异常,运用地面高精度磁测、勘查线剖面高精度磁测和钻探验证等综合勘查方法进行评价,依据Δ犜磁异常、高磁剖面异常和Δ犜化极向上延拓100 m 磁异常特征,首先预测了隐伏铁矿体的空间位置、产状,进而实施钻探验证,发现了苍山县沟西大型隐伏铁矿床,取得了良好的找矿效果,经对比分析已知矿体和磁场特征,建立了地质-物探找矿模式。     

地面磁测垂向二次导数在莱芜市石家泉矿区铁矿深部找矿中的应用

通过收集和研究莱芜富铁矿区早期的地面磁测资料,结合近几年在铁矿深部找矿中的理论及找矿实践,经过数据处理获得地面磁测ΔZ垂向二次导数异常,用以分解磁异常和圈定深部磁铁矿体的大致分布范围,在莱芜市石家泉地区找到了厚度较大的隐伏富铁矿体,初步估算铁矿石资源量在千万吨以上,取得了良好的找矿效果,同时对该地区深部铁矿找矿起到一定的借鉴。     

航空磁测异常的点表示法

利用航空磁测(航磁)数据绘制异常图,除了常用的平面剖面图和等值线图外,还可以用不同颜色点表示场值大小的点图来反映航磁的异常,由于航磁数据点的密度足够大,对阅图不但没有影响,还弥补了线图的一些不足.     

地面高精度磁测在隐伏铁矿勘查中的应用——以山东省禹城市李屯地区铁矿为例

山东省禹城市李屯地区铁矿是赋存于巨厚层新生代地层下的矽卡岩型铁矿床。利用地面高精度磁测对该地区航测地磁异常进行查证,进一步圈定了地磁异常范围。通过对地磁异常ΔT数据的位场转换处理,圈定4个地磁高值异常区,选取其中1个异常区进行钻探验证,首次在鲁西北地区发现了品位高、厚度大的矽卡岩型铁矿,地质找矿工作取得突破性进展。     

重磁方法在程家村隐伏磁铁矿勘查中的应用

为了验证程家村航磁异常圈闭,对该异常圈闭进行了查证工作,针对该区域铁矿体均呈深部隐伏的赋存状态,以"物探先行,钻探验证"的工作方法开展工作,利用地面高精度磁测扫面确定磁异常圈闭平面形态及位置;对高精度磁测剖面数据进行切线法剖面反演,确定强磁性地质体位置和埋深,再结合重磁剖面联合反演方法,推断强磁性地质体的赋存状态,从而给钻探验证提供依据。通过上述工作,取得了良好的找矿效果,表明重磁方法是深部隐伏磁铁矿勘查中的重要工作手段。     

磁法工作在算沟铁矿勘查中的作用

通过对算沟铁矿区磁异常见矿情况的评述,得出在隐伏区1/10000地面磁测异常能够基本指示铁矿体就位和赋存状态,中纬度区走向近东西向和走向北东向磁异常的正负异常之间也有磁性体分布。     

利用井中三分量磁测△T三维异常体特征分析磁铁矿体产状——以山东省兰陵县兰陵矿区古林矿段为例

常规的单孔井中三分量磁测能在二维空间上较准确地判断磁性地质体的方位和大致空间位置,该文利用群孔井中三分量磁测实现在三维空间上对磁性地质体赋存状态的准确判定,特别是ΔT磁参量,能更准确、更清晰地反映磁性地质体的三维空间形态。对古林矿区群孔井中三分量磁测数据进行整理后,利用Voxler软件进行井中三分量磁测ΔT磁异常三维立体成图,利用各岩性已知磁性参数特征,圈定可推断为矿致的ΔT三维异常体。通过对圈定的矿致三维异常体的分析,正确的推断了本矿区磁铁矿体的空间赋存状态,为该矿区勘查工作的顺利进行,起到了有力的推动作用。     

高精度磁测在青海省阿日特克山地区寻找矽卡岩型铜多金属矿中的应用与研究

青海省阿日特克山地区以矽卡岩型钼、铜、铅锌银多金属矿为主,含矿建造主要产于古元古代含碳酸质成分地层与海西期花岗闪长岩的接触带及捕虏体矽卡岩中,受接触带、断裂及层间破碎带等构造控制。因此寻找控矿构造及岩体可达到间接找矿的目的。通过高精度磁测圈定磁异常,并对磁异常的形态、规模分析解译,可确定磁性地质体的产状、形态和埋深等。在高精度ΔT等值线平面图上,断裂及层间破碎带,主要表现为串珠状、条带状线性异常带;岩体与地层的分界线,通常表现为明显的低缓梯级带—过渡带;隐伏岩体,主要表现为在正磁场背景中出现局部负异常(或相对低)。在寻找矽卡岩型铜多金属矿中,通过高精度磁测,能有效圈定中酸性岩体及构造,达到间接找矿的目的,同时也为钻探工程验证提供可靠的依据。     

青海省它温查汉西铁多金属矿床地质特征、控矿因素及找矿方向

它温查汉西铁多金属矿床是青海祁漫塔格地区新发现的又一典型矽卡岩型矿床,初步估算铁资源量规模已达中型。区内矿体与成矿岩体均隐伏于几百米厚的第四系风积砂覆盖层下,地表地质调查作用有限。在分析矿区成矿地质背景、地球物理背景及矿体特征的基础上,结合近年来在该地区的找矿经验、方法手段及应用效果,探讨了矿床的控矿因素和找矿方向。认为区内祁漫塔格群下岩组既是有利的含矿地段,也是矿源层;在祁漫塔格覆盖区进一步寻找铁多金属矿床,大比例尺地面高精度磁测与钻探结合是一种有效的方法组合,应注重正负磁异常交替部位以及游离于大面积负异常区外的局部正异常区的找矿评价,并加强对磁测解译构造的关注,特别是与已知矿床呈NWW向串珠状排列的构造结。      

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.     

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 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.     

Foreword

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