桐柏县老湾—鸿仪河金矿带原生晕研究

老湾—鸿仪河金矿带,经初步普查勘探已构成大型金矿,并伴随有强度高、规模大,浓度分带清晰的金(198km~2)、银(100km~2)地球化学异常,对扩大金矿带普查和外围普查找矿,提供了极为重要的地球化学依据。本文拟从地球化学特征的研究入手,着重对矿带地层及岩石中微量元素的分布、分配;矿区地质及地球化学异常特征;地球化学模型及评价指标进行讨论。同时为在该矿带进一步普查找矿,扩大矿床规模进行了预测评价。     

山东牟乳成矿带金青顶矿区三维综合找矿模型的构建及深部预测

探讨山东牟平-乳山成矿带金青顶金矿区成矿元素地球化学场三维分布特征,总结成矿规律,建立三维综合找矿模型,为金矿深部成矿预测提供更为丰富的信息,指导矿山生产与发展方向。针对金青顶矿区深部找矿问题,在全面收集已有地质、矿产资料的基础上,结合野外实地调查,应用三维建模与可视化技术、构造叠加晕及地质统计学理论与方法,构建矿床地质、地球化学场等方面的三维综合找矿模型,将金青顶矿床的预测评价研究拓展到三维空间,揭示了区内成矿地质特征和地球化学异常表征,据此探讨了矿体及地球化学场的三维空间分布规律。并在此基础上,开展了矿区的地质-地球化学综合信息分析与深部预测评价,减少了深部预测的不确定性。矿体三维模型显示,矿体呈现中间宽两端窄的形态,有向深部尖灭的趋势。三维地球化学场分布特征显示,Au、As、Sb、Hg、Cu、W、Sn、Co、Ni元素及组合因子主要分布于矿体浅部,向深部呈现元素场强度下降的趋势;Mo、Bi元素主要分布于矿体深部;Ag、Pb、Zn元素分布较分散,存在多个矿化中心。地质-地球化学三维模型显示,组合因子高得分区域与组合矿物富集区域相符合,Au成矿作用主要发生于矿体浅部,深部成矿作用减弱。应用格里戈良分带指数法求取Ⅱ号金矿体的原生晕垂向分带序列为Sb-Cu-Ni-Au-Sn-W-Hg-As-Co-Ag-Zn-Pb-Mo-Bi,该序列与单一期次成矿垂向分带序列进行对比无明显反常现象,指示Ⅱ号矿体当前开采深度以下成矿潜力不高。研究结果显示,在综合找矿模型指导下,基于三维地球化学空间场晕模型的三维地质、地球化学异常信息的展示、提取与综合分析,可以有效地评价深部成矿潜力,为深部成矿预测研究提供了新思路,有利于指导矿山工作的部署。综合分析认为金青顶Ⅱ号主矿体在-1 200 m以下找矿潜力一般,不宜继续进行大规模的深部探矿。      

辽宁省主要金矿化集中区特征及今后找矿工作建议

辽宁省位于华北地台北缘,其地质构造演化主要经历了地台基底形成（Ａｒ－Ｐｔ１）、盖层沉积（Ｐｔ２－Ｔ２）、地台活化（Ｔ３以后）三个阶段。按成矿物质来源、成矿环境、成矿作用、矿点矿化点空间分布规律及物化探异常特征,辽宁省可划分出朝阳县小塔子—北票迷力营子、义县红石砬子—刘龙台、葫芦岛市水泉、建昌县温杖子、凌源市柏杖子、阜新县地宫—建设、浑南、浑北、盖县猫岭、辽阳田家围子—凤城弟兄山及丹东市沿江等１２个金的主要矿化集中区。辽宁省今后的地质勘查工作应注意以下几点：（１）要更新找矿观念,注意寻找新类型和大型超大型矿床;（２）按区域成矿条件,选好找矿重点突破区;（３）精确地认识和了解已知矿床,坚持就矿找矿;（４）坚持“五统一”的部署原则,利用地质、地球物理及地球化学方法进行综合找矿。     

综合物化探方法在山西东腰庄绿岩带型金矿外围找矿中的应用

山西东腰庄金矿是我国典型的绿岩带型金矿床之一,主要赋存于新太古代五台群鸿门岩组浅色变质绿片岩中,含矿带岩性主要为硅化绢云钠长片岩和绢云钠长片岩,层控特征明显。本次建立了东腰庄金矿床地质-地球物理-地球化学找矿模型,并运用岩石地球化学勘查、电法勘探,在东腰庄金矿外围勘查区圈定化探异常4处、激电异常2处,其中化探1号多元素综合异常与电法异常吻合较好,推测为矿致异常,通过激电测深,推测地质体形态为透镜体,埋深较浅。综合物化探方法利用绿岩带型金矿形成过程中元素迁移带来的原生地球化学异常,以及主要载金矿物-黄铁矿与围岩之间的电性差异,在此次找矿勘查过程中圈定了找矿靶区,取得了较好成效,为下步钻探验证工作提供了依据。     

五莲户部岭地球化学异常特征及找矿前景

根据户部岭矿区水系沉积物、土壤和岩石剖面测量结果,对Pb,Zn等成矿元素的分布特征和组合关系进行了分析,总结了户部岭铅锌矿床的地质和地球化学异常特征,通过异常查证发现3个铅锌矿(化)体,并归纳出该矿床的地球化学找矿标志,提出了找矿前景。     

山东沂南王家坊庄铜钼矿地质特征及深部找矿方向研究

鲁西地区已发现多处多金属矿床,如沂南铜井金场金铜矿、平邑归来庄金矿等,通过对沂南王家坊庄地区野外地质调查分析,结合矿区地质特征、矿石特征、控矿条件、矿床类型的认识,揭示了山东沂南王家坊庄地区成矿地质背景、矿产特征及地球物理特征。本次研究工作共圈定5处找矿靶区,为区域找矿勘查工作提供了依据。     

山东省焦家金矿田地球物理综合信息的研究与找矿

本文是在研究胶东蚀变岩型金矿的矿田地球物理找矿模型基础上论述了焦家金矿田上磁场、电场、重力场的分布特征及通过位场转换所提取的各种信息，并阐述其与成矿的关系，提出了用航磁资料圈定找矿靶区的新认识，即在磁性岩体的边缘部及其附近进行找矿。并结合研究地质资料，认为郭家岭花岗闪长岩是控制金矿生成的岩体。     

桐柏─大别山北麓金矿带地质物化探找矿模型

从桐柏─大别山成矿带区域地质、地球物理、地球化学特征的研究入手，分析与金成矿有关的地层、构造、岩浆岩等控矿因素的地球物理场及地球化学特征；建立区域金矿找矿模型。     

青海省大柴旦双口山铅锌矿地质特征及找矿方向

根据矿床地质特征、岩石地球化学特征、矿体特征及矿床成因等综合分析认为,矿点沟向斜是主要控矿构造,沿其向斜核部具有很大的找矿潜力,预测具中-大型规模的远景,是今后找矿“攻深”“、找盲”的靶区。     

青海大场金矿田北缘灭格滩矿区土壤地球化学异常信息提取及找矿预测

灭格滩矿区位于青海北巴颜喀拉造山带大场金矿田北缘。三叠系巴颜喀拉山群昌马河组砂板岩是矿区主要赋矿地层。矿区内构造发育,矿(化)体主要沿NW向构造破碎带分布,产状受破碎带控制。围岩蚀变主要有硅化、黄铁矿化、毒砂化、绢云母化等。1∶10 000土壤地球化学测量Au、As、Sb、Hg元素丰度明显偏高,异常明显,浓集中心突出,各元素异常套合较好,呈NW向带状分布。剖面上元素含量峰值与矿体位置对应良好,据此构建了地质-地球化学找矿模型,能有效指导隐伏矿体的找矿勘查工作。在综合分析矿区地质及土壤地球化学异常特征的基础上,圈定了找矿靶区和成矿远景区,可以为灭格滩金矿区乃至矿田核心区外围找矿勘查工作提供重要参考。      

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.     

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     

Exposure ages and radiogenic ages of ureilite(GRV 024516) and ordinary chondrite(GRV 024517) from Antarctica

The GRV 024516 and GRV 024517 meteorite samples collected from Grove Montains,Antactica are ureilite and H5 ordinary chondrite,respectively.Based on the study of mineralogy-petrology,the cosmic-ray exposure ages and gas retention ages of these two meteorites were determinated and calculated.Their cosmic-ray exposure ages are 33.3 Ma,51.7 Ma,and gas retention ages are 1936.8 Ma and 3720 Ma,respectively.The ureilite contains diamond,graphite and amorphous C,which are mainly carrier of noble gases indicating obviously shock metamorphism effects,which induced 40Ar partial loss.The H5 chondrite indicates thermal metamorphism of parent body,its gas retention age fall the range between 3220 Ma and 4510 Ma of the least shocked H5 chondrites