Geochemistry and zircon U-Pb chronology of quartz porphyry in Yuejinshan Fe-polymetallic deposit of Heilongjiang

Quartz porphyry in Yuejinshan Fe-polymetallic deposit is one of the rock masses, which formed the granite belt relating to the late Yanshanian skarn-type Fe-polymetallic deposits in the eastern Heilongjiang, and is also closely related to the metallogenic space of the Fe-polymetallic deposits. Quartz porphyry has the zircon U-Pb concordia age of 125.0±1.1 Ma, overall showing high Si(SiO_2=74.48%--75.00%), rich alkaline(Na_2O+K_2O=7.93%--8.17%, K_2O/Na_2O=1.39--1.46), and poor Mg(MgO=0.27%--0.31%), with the A/CNK value being 0.95--0.99, having the characteristics of obvious enrichment of LREE and medium Eu negative anomaly(0.69--0.74), indicating that the rock belongs to quasi-aluminous high potassium calc-alkaline series and has the same characteristics as those of the I-type granite. The rock is also characterized by the enrichment of LILE and active incompatible elements, and depletion of HFSE such as Nb, Ta, P and Ti, with the Mg~# value being 32--37, indicating that the rock originated from partial melting of crustal materials. It can be concluded from the above characteristics or data and from the distribution of contemporary magmatic rocks in the area, that quartz porphyry in Yuejinshan Fe-polymetallic deposit was formed in a tectonic background of the subduction of the paleo-Pacific plate in late Yanshanian.     

Potassium channel in peripheral blood lymphocytes of turbot (Scophthalmus maximus)

In order to provide pertinent evidence of ion channel with immune response in the fish,whole cell patch-clamp technique was employed for potassium ion channel study in turbot(Scophthalmus maximus) . Lymphocytes were isolated by Percoll density gradient centrifugation from peripheral blood samples,and electrophysiological characters of the channel were analyzed. In the recorded cells,activated voltage of the channels was-42.5 ± 3.7 mV and the average peak current was 313.12 ± 28.2 pA. The channel was identified as voltage dependent,the current was outward and it could be inhibited by 10 mmol/dm 3 TEA or 5 mmol/dm 3 4-AP,a specific potassium channel inhibitor,identifying the existence of potassium channel in peripheral lymphocytes of the turbot.     

基于数字地形分析的火星地貌自动化分类方法

提出了基于纵坡面统计特征的火星地貌类型单元划分体系,详细阐述了地形特征因子及分类所需特征空间的选取建立过程.实验结果表明.以此为基础的火星表面地貌自动分类方法基本能与高程、影像信息反映事实相符.与目前公布的分类成果具有一定的可比性,达到了预期的研究目的.     

长江倒灌对鄱阳湖水动力特征影响的数值模拟

长江水倒灌是鄱阳湖的一个重要现象,是江湖作用的具体体现.利用环境流体动力学开源代码(EFDC)建立鄱阳湖的二维水动力模型,并借助染色剂模块和水龄模块,分析鄱阳湖全年的水动力变化过程、倒灌现象及其影响.数值模拟结果精确地验证倒灌的发生、持续时间和倒灌流量,显示倒灌时期湖区水力梯度、湖流逆向的特点.顶托作用强于鄱阳湖盆地作用时是倒灌发生的条件,通过计算倒灌发生的临界流量并与实际来流进行对比,本文提出新的倒灌判定条件,可以准确地预测倒灌和预估倒灌流量,且利用2007 2009年的测量数据验证了其可靠性.通过在赣江入流设置染色剂的方法,模拟获得2008年4次倒灌入流水体在湖区的占据面积.顶托作用和倒灌造成湖水不能外泄甚至逆流,增加湖区水体的水龄,通过数值模拟并与水力停留时间进行对比,估算出湖湖水水龄的增加时间.     

Identification of five strains of antarctic bacteria producing low-temperature lipase

1 IntroductionMicroorganism is an important constituentof the antarctic, arctic and deep sea ecosystemswhich are characterized as permanent lowtemperature. To adapt and survive in this ex-treme environment, these microorganisms pro-duce many distinctive substances such as poly-unsaturated fatty acids (PUFA), low-tempera-ture enzymes and novel pigments, etc. (Thomasand Dieckmann, 2002). Low-temperature en-zymes have a property of higher specific activ-ity (Kcat) at low temperature. Owing to…     

山西梨园金矿黄铁矿微量元素及S-Pb-He-Ar同位素地球化学特征及其地质意义

山西梨园金矿是近年华北克拉通内部金矿找矿的新进展,其矿化样式多,具有较高的研究价值。梨园金矿赋存于太古宙阜平群片麻岩和混合岩化花岗岩中,受区内北北东向断裂控制,主要由爆破角砾岩型的1号矿体和石英脉型的2号矿体组成。矿石矿物主要为黄铁矿、方铅矿和闪锌矿等,脉石矿物主要为石英、绢云母、钾长石等,蚀变类型主要为硅化、钾长石化、绢云母化、绿泥石化等。黄铁矿、黄铜矿和闪锌矿δ³⁴S值为0.9‰~4.3‰,平均值为3.0‰,说明硫源主要来自岩浆;方铅矿δ³⁴S值为-12.8‰~1.4‰,平均值为-4.2‰,pH值升高可能是造成方铅矿高负δ³⁴S值的原因。金属硫化物Pb同位素变化范围较小,²⁰⁶Pb/²⁰⁴Pb为16.697~16.890,²⁰⁷Pb/²⁰⁴Pb为15.239~15.267,²⁰⁸Pb/²⁰⁴Pb为42.186~45.334,均落入下地壳演化线附近,表明成矿流体运移过程中可能淋滤了富Th的下地壳物质。黄铁矿的³He/⁴He为0.27~1.04 R_a,⁴⁰Ar/³⁶Ar为1 194.61~5 488.80,³⁸Ar/³⁶Ar为0.204~0.218,表明成矿流体主要来源于地壳,部分来源于地幔流体,具有壳幔混合的岩浆流体特点。微量元素特征显示黄铁矿具有岩浆热液型黄铁矿的特点,辉绿岩脉和石英斑岩的部分物质可能加入了成矿过程。文章认为梨园金矿为与浅成岩浆侵入作用相关的岩浆热液型金矿床,爆破角砾岩型和石英脉型矿体不同的沉淀机制和矿物结晶过程是导致二者REE含量、S-Pb-He-Ar同位素等方面存在差异的主要原因。梨园金矿深部具有寻找细脉浸染型矿体的可能,其成矿作用是太行山中部地区燕山期构造岩浆活动的又一具体表现。     

Characteristics and sources of ore-forming fluids of South Narimalahei copper polymetallic deposit in East Kunlun,Qinghai

The South Narimalahei area is located on the north side of the Middle Kunlun fault in the eastern section of the East Kunlun composite orogenic belt. The ore body is veined and controlled by structures and se-condary fissures, which occurs in the structural alteration fracture zone in the Late Triassic granodiorite. In this deposit, copper mineralization is closely related to silicification and sericification. The formation process of the deposit includes hydrothermal mineralization and supergene oxidation. In this paper, the fluid inclusion minera-logy, microscopic temperature measurement and stable isotope studies have been carried out for ore of the main mineralization stage. The results show that the primary gas-liquid two-phase inclusions and a small amount of single-liquid inclusions are mainly developed in the quartz in the main mineralization stage. The results of microscopic temperature measurement show that the ore-forming fluid which has low temperature(151.7℃--205.8℃), low salinity(2.06 wt%--4.94 wt%NaCl), low density(0.86--0.92 g/cm~3) and shallow formation(1.5--3.0 km) is a hydrothermal solution of NaCl-H_2O system. Hydrogen and oxygen isotope results show that the ore-forming fluids mainly come from atmospheric precipitation, with a small amount of magmatic fluids participating. It is preliminarily determined that the South Narimalahei copper polymetallic deposit is a low-temperature hydrothermal vein deposit.     

深水桥梁台阶式沉井基础局部冲刷特性研究

为探究台阶式沉井基础附近局部冲刷的影响,建立三维水动力数学模型,计算分析恒定流下台阶式沉井基础附近水动力特征。基于数值模拟结果设计了8个有效试验工况进行物理模型试验,分别探究了台阶式沉井平台宽度、埋置深度以及挡墙高度对局部冲刷特性的影响并进行讨论。试验结果表明台阶式沉井局部最大冲刷深度随平台截面宽度比增大逐步减小并趋于稳定。台阶式沉井局部最大冲刷深度随平台埋深比增大而逐步减小最终趋于稳定。台阶式沉井平台处设置较低挡墙对减小沉井周围局部冲刷最大深度有小幅的效果。     

旅游地社会-生态系统适应性研究进展

适应性思想和方法因符合生物多样性保护要求,对实现旅游地社会-生态系统可持续发展和改善旅游地社区生计具有重要意义,业已成为学术界关注的焦点。在对旅游地社会-生态系统适应性研究文献系统分析基础上,从研究尺度、研究对象、评估方法和分析框架4个方面进行了详细的梳理与评述,研究发现：① 研究尺度宏观微观相结合,以小尺度研究居多,中尺度研究需加强,研究对象需要多维度融合;② 研究结合多角度框架分析,主要包括“脆弱性-适应性”“恢复力-可持续性”和“恢复力-适应性”3种类型,促进多元化评估方法在旅游地社会-生态系统适应性研究中的应用;③ 研究思路和研究内容需综合多学科领域进一步拓展。     

Trends and uncertainties in surface air temperature over the Tibetan Plateau, 1951–2013

Trends and uncertainties of surface air temperature over the Tibetan Plateau (TP) are evaluated by using observations at 100 meteorological stations during the period 1951–2013. The sampling error variances of gridded monthly data are estimated for every month and every grid box of data. The gridded data and their sampling error variances are used to calculate TP averages, their trends, and associated uncertainties. It is shown that large sampling error variances dominate northern and western TP, while small variances appear over southern and eastern TP. Every month from January to December has a positive linear trend during the study period. February has the largest trend of 0.34 ± 0.18°C (10 yr)^–1, and April the smallest at 0.15 ± 0.11°C (10 yr)^–1. The uncertainties decrease steadily with time, implying that they are not large enough to alter the TP warming trend.