西范坪斑岩铜矿钾硅酸盐化作用的地球化学研究

西范坪铜矿是我国近年来新发现的斑岩型铜矿床。伴随铜矿化发生了强烈的钾硅酸盐化。蚀变作用使成矿主岩的 Si O2 ,K2 O增加 ,Ca O,Na2 O,Fe2 O3 减少 ;大离子亲石元素含量降低 ;L REE减少 ,L a N/ Yb N 比值升高 ,δEu值降低。通过研究认为 ,西范坪铜矿成矿母岩是富钠 (Na2 O>K2 O)斑岩 ,而不是富钾 (K2 O>Na2 O)岩石 ,这说明相对富钠的斑岩也能成矿。     

川滇密西西比河谷型铅锌矿床成矿流体来源研究:流体Na-Cl-Br体系的证据

应用流体包裹体滤液分析方法，测定了川滇7个MVT铅锌矿床成矿流体的Na,Cl,Br含量，结果表明成矿流体的x(Na/Br)和x(Cl/Br)的平均值分别为185和73，并与高度蒸发浓缩的残留海水的x(Na/Br)和x(Cl/Br)相近。成矿流体的Na,Cl含量呈正相关，在lgNa-lgCl图解中呈线性分布。根据这些事实以及矿床地质特征，认为原始成矿卤水起源于蒸发浓缩的残留海水，原始含矿卤水与富含有机质的大气降水混合导致矿质沉淀而成矿。     

A Comparison of Nd Isotopes of Granitoids from the Central Asian Orogenic Belt and Qinling-Dabie Orogen,and Implications for Understanding of Crustal Growth from Accretion to Collision

正Orogens can generally be divided into two types:accretionary and collisional.The fundamental differences in deep-crustal compositions and architecture from accretion to collision and how to identify them is not well understood.This is one of the major aims of the IGCP 662 project (www.igcp662.org.cn).The Central Asian Orogenic Belt (CAOB) is a typical and the world's largest Phanerozoic accretionary orogenic belt and the     

试论中国重要景观区区域地球化学异常系统评价的量化模型

在对中国5个重要景观区1:20万金、铜表生地球化学异常特征进行总结、对比,并讨论景观、表生因素对区域异常评价标志影响的基础上,进一步充实、完善了区域异常系统评价体系的思路和评价准则,提出了区域地球化学异常系统评价的量化模型。     

钻孔灌注桩侧摩阻力试验研究及修正计算

确定桩侧极限摩阻力的大小,目前工程上广泛采用的是以经验方法为主,辅以检测桩试验数据分析,得到的结果往往存在误差。通过静载试验以及应力测试对桩侧摩阻力的发挥模式进行分析,并结合工程实例针对桩侧摩阻力的计算提出了相应的修正系数。     

Correction to: Discrete dynamical Pareto optimization model in the risk portfolio for natural disaster insurance in China

Natural Hazards - The original article, Discrete dynamical Pareto optimization model in the risk portfolio for natural disaster insurance in China, in Natural Hazards (2018) 90: 445–460, was...     

Energy transition,CO2 mitigation,and air pollutant emission reduction: scenario analysis from IPAC model

The salinization of freshwater-dependent coastal ecosystems precedes inundation by sea level rise. This type of saltwater intrusion places communities, ecosystems, and infrastructure at substantial risk. Risk perceptions of local residents are an indicator to gauge public support for climate change adaptation planning. Here, we document residential perspectives on the present and future threats posed by saltwater intrusion in a rural, low-lying region in coastal North Carolina, and we compare the spatial distribution of survey responses to physical landscape variables such as distance to coastline, artificial drainage density, elevation, saltwater intrusion vulnerability, and actual salinity measured during a synoptic field survey. We evaluate and discuss the degree of alignment or misalignment between risk perceptions and metrics of exposure to saltwater intrusion. Risk perceptions align well with the physical landscape characteristics, as residents with greater exposure to saltwater intrusion, including those living on low-lying land with high concentrations of artificial drainages, perceive greater risk than people living in low-exposure areas. Uncertainty about threats of saltwater intrusion is greatest among those living at higher elevations, whose properties and communities are less likely to be exposed to high salinity. As rising sea levels, drought, and coastal storms increase the likelihood of saltwater intrusion in coastal regions, integrated assessments of risk perceptions and physical exposure are critical for developing outreach activities and planning adaptation measures.

     

Atmospheric Reactive Nitrogen Cycle and Stable Nitrogen Isotope Processes: Progresses and Perspectives

Oxidized reactive nitrogen in the atmosphere mainly consists of nitrogen oxides (NO _X =NO+NO₂, NO₃) and nitric acid. The atmospheric cycling of NO _X influences the formation of ozone and hydroxyl radicals that are important for atmospheric oxidation capacity. Nitric acid, the final product of NO _X oxidation, not only is an important component of particulate pollutants, but also has a direct impact on the ecosystem through dry and wet deposition. The stable nitrogen isotope (δ¹⁵N) shows the potential to study reactive nitrogen cycle, and to trace the emission, transport and deposition of reactive nitrogen from local to global scales. Here, we reviewed previous studies using δ¹⁵N to investigate NO _X emission and atmospheric reactive nitrogen cycle, and discuss the uncertainties of δ¹⁵N signatures of different NO _X sources from two aspects: NO _X generation mechanism and NO _X collection methods. We also discussed the nitrogen isotope fractionation and the consequences during the conversions of NO _y molecules. We ended up with discussions on the possibility of using δ¹⁵N to trace NO _X emissions. Although there are still large uncertainties in quantifying and tracing NO _X emissions using nitrogen stable isotopes, such isotope tool is efficient enough to trace reactive nitrogen cycles in the atmosphere. On the basis of this, we proposed that we can combine atmospheric chemistry transmission models with isotope tracers to improve our understanding of regional and global atmospheric reactive nitrogen cycle regarding the fluxes of different emission sources, their atmospheric transformation, etc.     

郯庐断裂带（安徽段）对地表水系空间分布形态的影响研究

为了研究郯庐断裂带（安徽段）构造活动对其周边地表水系形态及其发育特征的影响,本文基于DEM数据,利用GIS空间分析功能并结合郯庐断裂带构造运动特征,对郯庐断裂带（安徽段）周边水系的几何分布特征进行研究。研究表明：郯庐断裂带（安徽段）在不同地质历史时期对区内地表水系产生错动影响。受郯庐断裂三叠纪到白垩纪期间左旋走滑运动影响,两条二级水系在大别山区自西北向东南流经郯庐主干断裂及次级断裂时与断裂呈近似直角相交并发生左旋错动。大别山地区的皖河流域与华阳河流域水系受郯庐断裂第四纪以来逆右行平移运动影响流向由东南向同步大幅度拐向南西,表现为右旋扭错;巢湖流域水系受五河—合肥断裂和石门山断裂影响也出现了右旋位错。此外,受郯庐断裂带构造运动形成的合肥盆地和地堑式嘉山盆地的影响,池河的主河道沿合肥盆地东侧的沉降带和石门山断裂与嘉庐断裂之间的嘉山盆地发育。     

栖霞金矿床成矿流体地球化学研究

栖霞金矿床是胶东地区产在变质岩中的石英脉型金矿床较典型的代表。该矿床属中低温热液矿床，成矿流体的盐度较低，气相成分以Ｈ２Ｏ，ＣＯ２为主；液相成分中Ｎａ＾＋，Ｃａ＾２＋和Ｃｌ＾－的含量料高，相对贫Ｋ＾＋和Ｆ＾－，流体的成分与大气降水热液的相类似。