Geology of the 2018 Winter Olympic site,Pyeongchang, Korea     

Moonsup Cho  Kyoungwon Min  Hyeoncheol Kim 《International Geology Review》2018,60(3):267-287

We review the geology of the Gyeonggi Massif, Gyeonggi Marginal Belt, and Taebaeksan Basin of the Korean Peninsula, which are relevant to the 2018 Winter Olympic sites. Neoarchaean–Palaeoproterozoic gneisses and schists of the Gyeonggi Massif underwent two distinct collisional orogenies at the Palaeoproterozoic (1.88–1.85 Ga) and Triassic (245–230 Ma). These basement rocks are structurally overlain by a suite of Mesoproterozoic to Early Permian supracrustal rocks of the Gyeonggi Marginal Belt, consisting primarily of medium-pressure schists and amphibolites metamorphosed at ~270–250 Ma. In contrast, sedimentary successions in the Taebaeksan Basin, commonly fossiliferous, consist primarily of Early Cambrian–Middle Ordovician Joseon Supergroup and Late Carboniferous–Early Triassic Pyeongan Supergroup. The ‘Great Hiatus’ between the two supergroups is characteristic for the North China Craton. The marked contrast in tectonometamorphic evolution between the Taebaeksan Basin and Gyeonggi Marginal Belt suggests an existence of major suture in-between, which is most likely produced by the Permian–Triassic continental collision between the North and South China cratons. Finally, recent tectonics of the Korean Peninsula is governed by the opening of East Sea/Sea of Japan during the Late Oligocene–Early Miocene. This back-arc rifting event has resulted in an exhumation of the Taebaek Mountain Range, estimated to be 22 ± 3 Ma on the basis of apatite (U–Th)/He ages. Thus, high topography in the 2018 Winter Olympic sites is the consequence of Tertiary tectonics associated with the opening of a back-arc basin.  相似文献   

工程地质分区在济南奥体中心勘测中的应用     

刘文峰  吉龙江  罗永现 《山东国土资源》2012,28(4):41-44

对场地地质条件进行平面上合理的分区和评价,是岩土工程勘测工作的重要内容,也是地基基础方案设计的第一步。通过工程地质分区在济南奥体中心勘测中的实际应用,分析场地按地质条件细分对地基承载力、地基基础设计及场地类别划分的影响,指出工程地质条件的详细分区在重大工程建设中的重要性。  相似文献   

基于本底线的2008年北京奥运会客流量预测   总被引：9，自引：0，他引：9  

孙根年  马丽君 《地理研究》2008,27(1):65-74

依据多种调查资料和旅游本底趋势线理论,对2008年北京奥运会引致下的旅游客流量变化及客源结构进行细致的预测,主要结论如下:(1)奥运庆典引致下,未来3年北京市入境旅游进入一个超常增长期,客流量统计线将掀起一个"凸形峰",2007~2009年入境客流量分别达到433.6万、517.2万和465.3万人次,较起本底趋势线净增长8%、25%和10%;(2)国内旅游也将进入一个超常增长期,2007~2009年国内客流量分别达到14410万、17384万和16285万人次,较本底趋势线净增长4%、20%和8%。入境旅游的相对贡献率高于国内旅游;(3)奥运庆典引致下的北京市国际/国内客流量超常增长是一个具有特定周期的事件旅游,可划分为"奥前"、"奥中"和"奥后"三个阶段,本文依据客流量年内变化和奥运庆典生命周期,给出了2007~2009年3年各月客流量的预测值;(4)奥运盛典及其设施与活动像"磁场"吸引着国内外游客,结合近年来主要客源市场调查资料,给出了国际国内客源地客流量预测值。  相似文献   

Heavy Air Pollution in Beijing and Possible Impact on Olympic Athletes     

Tunga Salthammer 《洁净——土壤、空气、水》2008,36(9):731-733

In 2001 the Olympic Games were awarded to the city of Beijing, China's second‐largest industrial center after Shanghai. Although the extreme air pollution in Greater Beijing has already been examined for some time in the scientific literature, it only gained public interest recently. The article summarizes the scientific facts.  相似文献   

2008青岛奥帆赛震情保障工作介绍     

潘元生  史雯  卢桦楠  齐力杰 《国际地震动态》2008,(8)

根据对青岛市(测震、强震、前兆、流动)监测台网现状的研究, 在地震监测、地震趋势预测预报、震后趋势判定、地震应急等方面论述震情保障, 介绍了保障工作和措施.  相似文献   

中国杰出体育竞技人才成长因素的地理分析——以奥运冠军为例   总被引：4，自引：0，他引：4  

吴殿廷  赵江  刘鸽  肖敏 《地理科学》2007,27(6):779-784

在建立奥运冠军数据库的基础上,用多元统计分析的方法总结出奥运冠军分布的时空特征,考察了影响奥运冠军成长的地理环境因素。奥运冠军籍贯分布东多西少;南北平分秋色,但力量型项目主要集中在东北和华北,技术型项目主要集中在江浙、中南和西南。父母生理素质的遗传为子女的成长提供了客观可能,但后天的刻苦训练更为重要;经济不落后的地区,有资金支持体育竞技项目,杰出体育竞技人才培养得较多;家庭经济不太好,父母才舍得让子女从事体育竞技项目,子女才肯于吃苦,更可能在力量型项目上夺得冠军。教练是影响杰出体育竞技人才成材的最关键人物;不同的自然地理环境造就不同类型的运动员;社会舆论对运动员既是压力也是动力,国家政策上的支持及对外交流,也是一个优秀运动员成长的不可缺少因素。  相似文献   

冬奥张家口赛区降雪天气分型及其预报概念模型研究     

马洪波  陈长胜  马梁臣  杨玥  李江波 《气象科技》2022,50(6):822-829

利用冬奥张家口赛区云顶和古杨树两个赛场的地面加密站网观测资料和高空探测资料、ERA5的0.25°×0.25°高分辨率再分析资料,从降雪时空分布特征、高低空环流形势配置等对2019年和2020年冬季(11月至次年2月)张家口赛区的降雪过程进行天气学统计分析。结果表明：降雪天气的环流背景主要归纳为3个类型,分别是低涡气旋型、冷锋型和西北气流型。不同天气模型下降雪量时空分布具有典型特点,低涡气旋型过程平均降雪量最大,降雪持续时间长,云顶赛场比古杨树赛场降雪量多16.9%;冷锋型过程平均降雪量次之,云顶赛场比古杨树赛场降雪量多44.4%;西北气流型过程平均降雪量最少,持续时间短,但是两个赛场差异最大,云顶赛场比古杨树赛场降雪量多140%。  相似文献   

Associations between zircon and Fe–Ti oxides in Hiltaba event magmatic rocks,South Australia: atomic- or pluton-scale processes?     

M. R. M. Ferguson  K. Ehrig  S. Meffre  A. R. Cherry 《Australian Journal of Earth Sciences》2020,67(2):201-220

Abstract

The Hiltaba Suite intrusive rocks and penecontemporaneous Gawler Range Volcanics (GRV) comprise the 1590?Ma Gawler silicic large igneous province in the Gawler Craton, South Australia. Zircon is principally associated with Fe–Ti oxides and clusters of touching crystals in these rocks, including in the Roxby Downs Granite (RDG), host of the Olympic Dam iron oxide–copper–gold deposit, and in other intrusive rocks that comprise the Olympic Province. There has been no explicit evaluation and explanation of potential origins published for concentrations of zircon with Fe–Ti oxides (herein zircon-rich clusters) found in these and similar rocks of western North America and elsewhere. Here we use U–Pb geochronology, mineral morphologies and compositions, and insights from surface chemistry and liquid-bound particle interaction studies to investigate zircon-rich clusters and provide a model for their formation. U–Pb geochronology does not reveal any concordant zircon populations older than ca 1590?Ma, so it is unlikely that there are significant xenocrystic zircon grains or that the zircons include significant inherited cores. The lack of pre-magmatic zircon, consistent intra-grain and inter-grain zircon compositional trends, the predominance of oscillatory zoned zircon with morphologies indicating growth from hot, evolved silicate melts, and the lack of evidence for zircon recrystallisation, indicates that zircon crystallised in the host GRV and RDG magmas. Variable zircon compositions within individual clusters does not support epitaxial nucleation of zircon on Fe–Ti oxides, but it is likely that some zircon grains grew from seed crystals formed by exsolution of Zr from Fe–Ti oxides. Aggregation of isolated, liquid-bound crystals is energetically favourable, and the grainsize discrepancy between larger crystals (Fe–Ti oxides, pyroxenes) and smaller accessory minerals (zircon, apatite) maximises the disparity in particle velocities and hence enhances the opportunities for collisions and adhesion between these crystals. We propose that zircon adheres to Fe–Ti oxides with greater ease and/or with greater bond strengths, than to other phases present in the parental magmas. It is possible that this association is related to interactions between zircon and Fe–Ti oxide surface sites with opposing charges, presuming the distance between phase surfaces is sufficiently small. The occurrence of small zircon grains within Fe–Ti oxides and both euhedral zircon and zircon with asymmetric growth zonation in contact with Fe–Ti oxides indicates that several processes are responsible for the high concentrations of zircon crystals in some Fe–Ti oxide clusters.

1. Zircon is principally associated with Fe--Ti oxides in 1.59 Ga Gawler Range Volcanics (GRV) and Roxby Downs Granite (RDG)

2. U–Pb geochronology does not reveal any concordant zircon populations older than ca 1590?Ma

3. Zircon compositions and morphologies indicate that zircon crystallised in the host RDG and GRV magmas and suggest recharge, reheating and mixing occurred in these magmatic systems

4. Seed crystals, aggregation and surface chemical affinities contributed to the strong association of zircon and Fe–Ti oxides

  相似文献   

青岛市奥帆赛区海域表层海水中微量元素的研究     

刘刚  钟少军  瞿成利  刘飞  徐丽君 《海洋科学》2007,31(8):65-70

通过离子色谱离线螯舍和ICP—MS对青岛市汇泉湾、太平湾、浮山湾采集的海水样品进行分析,得到了该海域表层海水中微量元素质量比的可靠数据,并对表层海水中微量元素的分布特征及其影响因素进行了探讨。将分析结果与国家海水标准进行比较表明,该海域海水中微量元素质量比符合国家一级海水标准。对该海域表层海水微量元素的分布特征的研究表明,近岸和远岸表层海水中微量元素的质量比差别很小,而不同于沿岸海区质量比高,离岸远处质量比较低的一般规律。其主要原因是该海域的人为污染程度小,再加上其特殊的海岸地形以及水动力条件,有利于溶解物质的扩散、迁移和稀释。  相似文献   

智慧冬奥2022天气预报示范计划的实施与评估          下载免费PDF全文

陈明轩  杨璐  秦睿  宋林烨  李靖  邢楠  仲跻芹  孙超  王颖  刘凑华  窦以文  孙成云  时少英  于波  荆浩  甘璐  王宗敏 《大气科学学报》2024,47(3):361-375

主要介绍了“智慧冬奥2022天气预报示范计划”(简称FDP)的运行与评估结果。此次FDP是在我国首次针对中纬度山区0～10 d冬季天气预报展开的示范计划,国内气象部门内外共22家单位、近40个数值模式或客观预报系统参与了该计划。FDP实现了实时运行所需的多种源数据和多源数据产品的高效传输分发、监控、实时处理、综合集成显示。首次开展了次百米级客观预报、人工智能释用订正预报等新型技术在冬奥复杂山地赛场的实时示范应用,为冬奥气象中心和3个赛区预报团队提供了丰富多样和稳定可靠的高精度客观产品,有力支撑了高标准的冬奥气象服务保障。针对参与FDP产品的系统性检验评估发现,与模式系统原始预报相比,释用后的专项站点预报对平均风、阵风、温度、相对湿度等要素的预报误差明显减小。但是对于冬季复杂山地的降水、能见度预报,客观预报技术还有待进一步改进,而且站点解释应用效果不明显。此次FDP对风、温度、降水、能见度、相对湿度的最优预报检验指标(最小误差值),总体体现了目前国内在中纬度山区冬季天气客观预报的大致水平和现实能力,对于认识复杂山地冬季天气预报存在困难、提升高精度天气预报水平等具有极为重要的价值。  相似文献