中条裂谷的幔柱构造与成矿

中条山地区的地球物理场具有“三低一高”(低波速、低密度、低黏度及高地热异常)特点,变质核杂岩中赋存有科马堤岩并具“双层”结构,火成岩呈“双峰”状态,变质期的古地温为522～608℃,压力0.3～0.73GPa,地热梯度23℃/km,表明中条山地区为新太古代-元古宙的大陆裂谷—地幔热柱构造.其成矿作用存在着“四代同堂”的成矿模式,成矿期与岩浆侵入期的时差甚小;成矿空间上,大多数矿床沿着裂谷内两组断裂呈X型“对称式”展布,有益元素矿物组合及成矿温度自中心向周围呈有规律降低趋势.由于在新太古代以前,富铜的扬子板块俯冲至华北板块之下,促使中条裂谷的地壳加厚,形成丰富的成矿物质场,因为地幔热柱脉动式隆升,热液在运移过程中不断萃取地壳的铜质,故成为区域内独特的铜矿集中区.     

Geochemical Evolution and Environmental Changes of Qinghai—Xizang Plateau Since Late Cenozoic

Long-and short-term climatic curves were preliminarily established based on the comprehensive analysis of geochemical information since the Late Cenozoic in the Qinghai Xizang(Qinghai-Tibet)Plateau.The curves show that the climate in the plateau was alternatively dry-warm and cold-wet during the period of 30-3.4 Ma when the plateau was not uplifted to an enough altitude and the monsoon was not completely formed either,In the period of 3.4-0.73 Ma.the climate fluctuated between dry-cold and wet-warm when the plateau was rapidly uplifted and the Asian monsoon was consequently formed.Since 0.73 Ma.the climate became even drier when the plateau continuously rose.In the Holocene period.the climate alternatively changed with a complex model of being cool-dry,warm-wet and cold-wet.     

STUDY ON THE MIGRANT LABOUR FORCE OF CHINA IN RECENT YEARS──A Case Study of Nanhai City of Guangdong Province

I.INT~IOWFOralOngthe,thesyStemofPermanentresidencempistrationhasdividedChineseampleintOthO8ewith"tirbanresidence"andthOSehaving"rUralresidence".TherationingsyStem,underwhichedibleoilandgrainwasdistributedonlytOthOSewith"urbanresidence"Calds,hasbeendondnant.Bothsystems,beingcentraltorestrictingthegrowthofurbanpopulation,havestagnatedrUral-tirbaningration.Duringthe30yearsbefore1978,thestatedidsPOnsorpopulationmovementsfromrUraltourbanareasbymeansofenrollingnewworkers,butingeneral,thiss…     

吐哈盆地中下侏罗统煤成烃的形成与富集规律

吐哈盆地中下侏罗统水西沟群是一套厚达２０００ｍ的河沼－湖沼相煤系地层,其中的煤岩及暗色泥岩是已发现油气藏的主要源岩。形成于燕山期的古构造控制了油气富集,纵向上油气主要在中侏罗统聚集成藏。油气以垂向运移及短距离侧向运移为主,断裂控制了油气运、聚、保、散。多种构造样式与砂体交互配置,形成多种油气藏类型,构成复式油气聚集带     

Predicting gravel bed river response to environmental change: the strengths and limitations of a regime‐based approach

Rivers respond to environmental changes such as climate shifts, land use changes and the construction of hydro‐power dams in a variety of ways. Often there are multiple potential responses to any given change. Traditionally, potential stream channel response has been assessed using simple, qualitative frameworks based largely on professional judgement and field experience, or using some form of regime theory. Regime theory represents an attempt to use a physically based approach to predict the configuration of stable channels that can transport the imposed sediment supply with the available discharge. We review the development of regime theory, and then present a specific regime model that we have created as a stand‐alone computer program, called the UBC Regime Model (UBCRM). UBCRM differs from other regime models in that it constrains its predictions using a bank stability criterion, as well as a pattern stability criterion; it predicts both the stable channel cross‐sectional dimensions as well as the number of anabranches that the stream must have in order to establish a stable channel pattern. UBCRM also differs from other models in that it can be used in a stochastic modelling mode that translates uncertainty in the input variables into uncertainty in the predicted channel characteristics. However, since regime models are fundamentally based on the concept of grade, there are circumstances in which the model does not perform well. We explore the strengths and weaknesses of the UBCRM in this paper, and we attempt to illustrate how the UBCRM can be used to augment the existing qualitative frameworks, and to help guide professionals in their assessments. Copyright © 2016 John Wiley & Sons, Ltd.     

全球地质矿产数据库质量控制体系建立与应用

全球地质矿产建库数据资料涉及众多来源、多种存储格式、不同语种和多级尺度,保证建库数据质量是提供优质信息服务能力的关键。在全面分析国外地质矿产数据与资料特点的基础上,系统阐述了全球地质矿产数据库建设流程、建库标准规范、质量控制机制和质量检查方法。通过应用表明,全球地质矿产数据库建设的质量控制体系具有较强的实用性和广泛的推广性,在国外地质矿产数据库建设中具有一定的借鉴意义和推广价值。     

延安市自然资源监管“一张图”应用实践

自然资源监管是自然资源管理工作的重要内容。本文以延安市自然资源监管“一张图”系统为例,阐述了该系统的建设内容、应用情况及存在问题。系统梳理并建立了延安市自然资源数据目录体系,集成了土地利用监测分析、水源涵养评估等专题监管分析模型,搭建了云环境,以满足潜在的计算和存储性能扩展需求。系统为延安市自然资源监管提供了信息化支撑,也为今后开展更为深入的监管服务奠定了基础。     

江汉平原粮食产量空间格局分析

基于湖北省第一次地理国情普查数据、基础地理信息数据和统计年鉴等资料,采用洛伦兹曲线、Moran指数等对江汉平原典型4个粮食主产区监利县、洪湖市、仙桃市、潜江市的粮食产量空间格局进行了分析和研究。研究表明:①洪湖市耕地资源与粮食产量间的对应关系较为平等,粮食单产稳定,粮食生产空间聚集显著;②监利县、潜江市与仙桃市的耕地、粮食产量表现出极弱空间相关性或无相关性,粮食生产能力相对较差,耕地资源及产量未表现出空间聚集优势。该结论可为农业部门制定农业生产计划和发展规划提供良好的数据支撑,为地理国情普查成果的应用提供借鉴。     

2019年6月桂林三次强降水天气成因对比分析

利用多普勒雷达、气象卫星、自动气象站等监测数据以及NCEP再分析资料,对桂林2019年6月6-12日接连3次强降水天气过程的环流背景、影响系统与形成原因进行了对比分析。结果表明:(1)3次过程按影响系统分属暖区暴雨、低涡暴雨和锋面暴雨过程,均发生在高空急流右侧辐散、低空急流左侧辐合叠加区。(2)3次过程均受500 hPa短波槽和地面中尺度辐合线影响,但第1次过程中西南急流及地形等、第2次过程中低涡切变线、第3次过程中冷锋也起到重要作用。(3)3次过程的触发系统不同,第1次暖区暴雨过程迎风坡地形对其起触发作用,西南急流使得后向传播的对流云带维持;第2次低涡暴雨过程的触发系统为低层位于贵州一带的西南涡,西部冷空气侵入与西南急流加强是低涡对流云团维持较长时间的原因;第3次锋面暴雨的触发系统为冷锋,锋面配合锋前暖湿气流使对流云带加强。(4)第1次过程暖区暴雨MCS模态主要为线状后向扩建类,极端强降水出现在线对流中后端;第2次过程低涡暴雨MCS模态为涡旋类,极端强降水出现在涡旋中心附近;第3次过程锋面暴雨MCS模态由前期后部层云区线状对流转为层状云包裹对流系统,强降水发生在线对流弯曲或中心强回波处。     

虚拟地理环境知识工程初探

地理知识在虚拟地理环境（Virtual Geographic Environments,VGE）的科研与应用中发挥着极为重要的作用。现有地理知识工程研究整体处于初步探索阶段,且尚未在虚拟地理环境中展开。作为新一代GIS研究的科学方法和技术,虚拟地理环境具有典型的多领域、多协同、多交互、多模型及多感知的特点,但还亟需系统深入地了解VGE地理知识工程的特点、机理及关键技术。本文首先综述了国内外现有知识工程及地理知识工程研究现状,进而提出了VGE地理知识及VGE知识工程的概念和定义。在此基础上,本文分析了VGE地理知识有别于通用知识的特点,并提出了VGE地理知识的分类。最后,针对VGE地理知识工程的构建阐述了需解决的关键问题。本文基于VGE知识工程的初步探索,尝试为智能虚拟地理环境系统的构建提供理论基础,以促进虚拟地理环境中地理知识的快速转换和融合,为解决地理科学“数据丰富但知识贫乏”的问题提供一个可行的研究方向。