Spatially resolved properties of supernova host galaxies in SDSS-Ⅳ MaNGA

We crossmatch galaxies from Mapping Nearby Galaxies at Apache Point Observatory with the Open Supernova Catalog,obtaining a total of 132 SNe within MaNGA bundle...     

Lacustrine sedimentological and geochemical records for the last 170 years of climate and environmental changes in southeastern China

Reconstruction of modern climate and environmental changes in east Asia using inland natural climate archives can provide valuable insights on decadal–multidecadal climate and environmental patterns that are probably related to both natural and anthropogenic forcing. Here we investigated an 89‐cm‐long sediment core (TH1) from Tian Lake, southeastern China, for sedimentological, physical and geochemical parameters in order to understand climate and environmental changes for the latest two centuries. ¹³⁷Cs‐ and ²¹⁰Pb‐based age models show that the fine sand–coarse silt‐dominated core contains ~170 years (c. AD 1842–2011) of continuous sedimentation. Sediments with fine sands, low MS values, high water content, high TOC content and a high C:N ratio from c. AD 1842 to 1897 suggest intense hydrological conditions and strong runoff in the catchment, probably because of a humid climate. From AD 1897 to 1990, sediments with very fine sand and coarse silt, high MS values, low water content and unchanged TOC and C:N ratios indicate normal hydrological conditions and in‐lake algae‐derived organic matter. During this interval, the chemical weathering indicators show stronger weathering conditions compared with sediments deposited during AD 1842–1897, supporting the dominance of weathered surface soil input in the earlier interval and physical erosion dominance in the later period, respectively. Since AD 1990, the continuous decrease of geochemical proxies suggests human‐interacted Earth surface processes in the catchment of Tian Lake. A PCA revealed four dominant geochemical controlling factors – detrital input, trophic status, grain size and early diagenesis –, accounting for 26, 20, 18 and 16% of total variance, respectively. This study for the first time provides lacustrine geochemical evidence for the most recent two centuries of climate and environmental changes in coastal southeastern China, a region that is currently undergoing an inversion of critical zone, i.e. an overturning of its soil profile, owing to swift modernization.     

吉林省桦甸——靖宇地区早太古宙上壳岩成岩环境分析

本区早太古宙上壳岩是由变质火山岩和变质沉积岩组成。其中前者岩石化学、地球化学特征表明,具类似于岛弧拉斑玄武岩及安山岩的特点,并与世界典型的岛弧玄武岩地球化学型式具可比性,反映出岩石在成岩过程中具育相当于岛弧环境为主的演化趋势。变质沉积岩大致为一套岛弧间海盆地沉积的海相浊流岩。     

浙江诸暨地区陈蔡群主要地质特征及其构造演化探讨

陈蔡群原岩的主体形成于大洋岛弧环境，由拉斑玄武岩和同源辉长岩，碳酸盐岩和浊流沉积的泥砂质碎屑岩组成；经受了中压角闪岩相区域动力—热流变质作用和多期褶皱变形；岩石地球化学和同位素年代资料表明，中国东南的威尔逊旋回在中元古晚期便已开始，即那时于扬子古陆与华夏地块之间存在一大洋盆地，洋壳上可能存在拉张期残留的花岗质陆壳碎块。中元古晚期开始了洋壳消减作用及其有关的火山—沉积作用，新元古晚期陈蔡大洋岛弧地体与双溪坞陆弧地体拼贴、碰撞，壳体间的聚合作用触发了陈蔡群岩石的变质、变形。     

芜湖长江大桥桥位地壳活动及地震危险性评价

在芜湖长江大桥场地地震安全评价工作中,通过构造地貌,主要断裂活动性和断错物质微观运动特性标志等方面系统研究,结合地震活动时空特征分析,对该大桥及邻区地壳活动性进行了综合评价。研究结果表明,中生代一新生代早期,研究区地壳活动强烈,新生代晚期以来活动强度明显减弱,以块体之间差异升降为其主要活动特性,地壳能量是以小震方式断续释放,桥位所在地属相对稳定地段,适宜于构建芜湖长江大桥这一特大型工程,该研究为弱震区活动习性和地震危险性评价提供了一范例。     

发挥海洋水文气象资源优势,加快北海南珠产业发展

为了加快南珠产业的发展,对北海市沿海的地理环境、气候特征及水文条件进行分析,提出了如何加快南珠产业发展的对策     

雅安地区石材开发中对资源及环境的保护

介绍了四川省雅安地区储量丰富、质地名贵的石材资源;论述了在石材开发中由于管理不善,采矿、加工工艺落后,存在资源破坏严重和地质环境恶化等问题;提出了合理开采石材资源和进行地质环境保护的建议     

水力压裂法采盐对环境影响的环境地球化学研究

水力压裂法采盐对环境影响的环境地球化学研究向武鲍征宇（中国地质大学,武汉４３００７４）关键词水采法盐渍环境盐矿污染我国现有矿山１万多座,为国家提供了８０％的工业原料,同时也造成了较严重的环境危害。仅全国尾矿侵占和污染的土地就达６６７余万公顷,间接污...     

Estimation of Tasuj aquifer response to main meteorological parameter variations under Shared Socioeconomic Pathways scenarios

Theoretical and Applied Climatology - In this study, statistical and soft-computing methods are compared in forecasting groundwater levels under Shared Socioeconomic Pathways (SSPs) SSP1-2.6,...     

Impact of North Atlantic SST and Tibetan Plateau forcing on seasonal transition of springtime South Asian monsoon circulation

Climate Dynamics - The South Asian circulation and precipitation in spring shows a clear seasonal transition and interannual variation. We investigate how the North Atlantic sea surface temperature...