巴拿马海道关闭及其古海洋和古气候影响

位于中关洲的巴拿马海道曾是连通赤道东太平洋和大西洋的开放洋流通道。从中新世开始,巴拿马海道在构造运动的驱动下逐步关闭,切断了赤道太平洋和大西洋海水的直接交流。海道的关闭不仅改变了太平洋和大西洋海水的物理性质和洋流模式,还可能对新生代中晚期气候变化,特别是北半球大冰期的开始有重要作用。简要综述了二十余年来围绕巴拿马海道关闭及其古海洋、古气候意义方面的研艽成果和最新研究进展。很多相关的问题目前仍处于激烈的争论之中或尚未得到充分的认识,亟待开展进一步工作。开展相关研究将对促进我国古海洋和古气候研究具有积极意义,并有助于进一步加深我们对于海洋一气候系统的认识。     

The relationship between soft-bottom macrobenthic communities and environmental variables off Ningjin, eastern Shandong Peninsula

Macrobenthic infauna and associated environmental factors influencing the benthic community in the eastern coastal region of Shandong Peninsula were analyzed in four seasonal surveys from January 2007 to October 2007 (30 stations in winter, 20 stations in other three seasons), in order to understand the community structure and the factors unfluencing the benthic distribution. PRIMER 6.0 and SPSS 15.0 software packages were adopted to analyze the environmental and macrobenthic data. The results show that there were 260 macrobenthic species in total collected from the research region. The composition of species is:Polychaeta (94 species), Crustacea (75), Mollusca (56) and Echinoderm (12), among which, only 23 species were common species in the cruises of every season. The dominant species varied from season to season; however, the polychaete species Paralacydonia paradoxa Fauvel and Echinoderm species Amphioplus japonicus (Matsumoto) were always present year-round. The abundance and biomass of the macrobenthos in the research region were variable from season to season. The results of CLUSTER and MDS analysis show that the similarities of macrobenthic structures between the stations were low; most of the similarities were at about 30% of similarity value, only two stations were up to 70%. In accordance with the similarity values of the macrobenthic structures, we divided the 20 stations into five groups by arbitrary similarity level of 30%. The ABC curve indicates that the marcofauna communities in the research region had not been disturbed massively, except two stations, SB1 and SB3. Ecologically, benthos were controlled by a combination of factors such as salinity, phytoplankton, zooplankton, SiO₃-Si and temperature, and no single factor could be considered as an ecological master factor.     

叶县及时复垦关闭砖瓦窑惠泽村民

有的正在捡拾地里的碎砖块,有的点种着玉米、花生,有的在栽植红薯苗,有的在整理着土地……40多位村民说着,笑着,忙碌着。这是笔者6月4日在叶县遵化店镇霍张村砖瓦窑厂旧址看到的喜人场景。去年以来,叶县实行部门联动,在全县范围内开展了声势浩大的粘土砖瓦窑厂集中整治工作,按照“断掉电源,拆除设备,扒毁窑体,推倒工棚”的关闭标准,     

云浮-罗定地区推覆构造特征

最新区调成果表明，云浮－罗定地区震旦－石炭纪地层是被多条断层分割的块体，在剖面上它们层层叠置，在平面上沿一定方向延伸，构成了海西－印支期的自NW往SE方向逆冲的推覆构造体系，其间有构造窗、飞来峰。原地系统由石炭纪地层组成，外来系统为震旦纪、泥盆－石炭纪变质地层。初步论证了其形成时间、推覆方向、推覆体厚度、推覆平距。它的形成可能与钦州海槽关闭有关，属后展型叠瓦式逆冲推覆构造。     

关闭/废弃矿井地下空间资源精准开发利用模式研究

随着煤炭绿色资源的不断开采,位于煤炭开发利用全周期末端的矿井关闭\废弃问题逐渐显现,随之而来的关闭/废弃矿井地下空间资源开发利用成为一个亟须解决的问题。在对我国废弃矿井现状统计分析的基础上,以能源开采造成的地下空间方位、形态差异化为依据,将关闭/废弃矿井地下空间资源分为采空区空间资源、巷道空间资源、硐室空间资源;探讨了空间资源作为能源存储场所的单一利用方式和多方向、多领域协同多元开发利用的关闭/废弃矿井地下空间资源利用方式;并由此提出了一种关闭/废弃矿井地下空间分类分级精准利用模式,构建调研分析、工程类比初判、模型构建详估和软件决策系统研发为主干流程的精准开发利用系统,通过精准利用模式与精准开发利用系统模型对单一和多元开发利用方式进一步分析,为关闭/废弃矿井空间资源开发利用的研究和实践提供参考。      

矿山关闭后矿业城市面临的问题研究综述

在未来的几十年内我国将有大量的矿山关闭,针对矿业城市在资源枯竭后即将面临的问题,介绍国内外矿山关闭的研究现状,分析矿山关闭后带来的众多生态环境地质问题,以及国内矿山关闭后的各种资源的综合利用问题,探讨如何合理利用闭矿后的土地资源,并与城市土地利用规划相结合.     

山西曲沃县打响非法矿洞关闭战

近日,山西临汾曲沃县对紫金山矿区所有非法矿洞的爆破关闭工作拉开了帷幕。此次爆破关闭非法矿洞是曲沃县认真落实临汾市委市政府打击非法违法采矿“风雷一号”要求,对非法违法开采行为进行毁灭性打击,更好地保护资源的一项重要举措。为确保爆破关闭工作顺利开展并取得预期效果,曲沃县政府统一领导和安排,     

温县彻底关闭砖瓦窑

7月25日至28日,经过四天时间的全力攻坚,温县境内的39座砖瓦窑被彻底关闭。此前,温县的整治粘土砖瓦窑厂工作一度陷入被动。自2006年3月以来,该县政