石墨、萤石等战略非金属矿产发展趋势研究     

陈军元  刘艳飞  颜玲亚  高树学  欧阳友和  龙涛 《地球学报》2021,42(2):287-296

战略性新兴产业几乎或多或少都与非金属矿及其制品有关,随着战略性新兴产业的发展,我国战略性矿产资源消费将迎来快速增长期.本文选取石墨、萤石、高纯石英、叶蜡石四种非金属矿产为战略非金属矿产,收集其产量、消费量、贸易情况等资料,对其重要性及用途、供需情况等进行研究,并对其未来需求趋势进行预测.本文认为石墨、高纯石英、萤石、叶蜡石在战略性新兴产业中有重要应用,未来需求将呈快速增长趋势,其中石墨、萤石2030年需求量分别为138.7万t、567.9万t.为国家制定勘查投入及产业发展政策提供参考.  相似文献   

全球碳酸锂贸易格局与供应危机传播研究     

撒兴昌  高天明  张艳 《地球学报》2023,44(2):341-350

随着新能源产业的快速发展, 全球碳酸锂贸易量逐渐增长, 但其出口集中于少数国家, 这意味着全球碳酸锂供应存在一定的风险。为了深入了解全球碳酸锂贸易格局演变、供应危机传播路径及影响, 本文构建了2000—2021年全球碳酸锂贸易网络和级联失效模型, 概述了主要出口国贸易流向和贸易格局演变过程, 并模拟了不同供应危机来源的雪崩规模、传播路径及其影响。我们得到: (1)20多年来全球碳酸锂贸易集中度逐渐增加, 出口前三位国家保持稳定, 而主要进口大国变化明显, 贸易格局已由南美供应全球转变为南美供应东亚; (2)碳酸锂贸易供应危机的影响范围逐渐扩大, 间接传播逐渐占据主导地位; (3)智利供应危机对中日韩的影响程度逐渐扩大, 但对欧洲的影响时间最长; 阿根廷和中国的雪崩规模在上升、传播次数增加, 而美国则相反。本文将贸易格局演变与危机传播结合, 明确了全球碳酸锂主要贸易国智利、阿根廷、中国、德国等作为供应危机来源的影响程度及其传播路径。以上分析结果将有利于维护全球碳酸锂贸易稳定和主要贸易国采取应对策略缓解供应危机。  相似文献   

The concept of travelling bedload and its consequences for bedload computation in mountain streams          下载免费PDF全文

Guillaume Piton  Alain Recking 《地球表面变化过程与地形》2017,42(10):1505-1519

In bedload transport modelling, it is usually presumed that transported material is fed by the bed itself. This may not be true in some mountain streams where the bed can be very coarse and immobile for the majority of common floods, whereas a finer material, supplied by bed‐external sources, is efficiently transported during floods, with marginal morphological activities. This transport mode was introduced in an earlier paper as ‘travelling bedload’. It could be considered an extension of the washload concept of suspension, applied to bedload transport in high‐energy, heavily armoured streams. Since this fine material is poorly represented in the bed surface, standard surface‐based approaches are likely to strongly underestimate the true transport in such streams. This paper proposes a simple method to account for travelling bedload in bedload transport estimations. The method is tested on published datasets and on a typical Alpine stream, the Roize (Voreppe, France). The results, particularly on active streams that experience greater transport than expected from the grain sizes of their bed material, reinforce the necessity of accounting for the ‘travelling bedload concept’ in bedload computation. The method relevance is discussed regarding varying flood magnitudes, geomorphic responses and eventual anthropic origin of the ‘travelling bedload’ phenomena. To conclude, this paper considers how to compute bedload transport for a wide range of situations, ranging from sediment‐starved cases to the general mobile bed alluvial case, including the intermediate situation of external source supply on armoured bed. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

兴济地电阻率观测精度提高实验     

郭学增  张蕾  信士民  李瑞卿  李凤  刘静 《地震地磁观测与研究》2018,39(2):70-76

通过增大测量极距和提高供电电流2种实验途径，探讨提高兴济地电台地电阻率观测精度，结果表明，提高供电电流能明显提高兴济地震台地电阻率观测精度，且与供电电流提高倍率相当，而增大测量极距效果甚微。其原因是，提高供电电流是在干扰幅值不变情况下增大人工供电电位差，而增大测量极距使人工供电电位差和干扰幅值同比例增大，二者相抵，对观测精度作用不明显。  相似文献   

西藏多龙矿集区荣那铜金矿床蚀变矿物学和地球化学及找矿意义   总被引：1，自引：0，他引：1  

赵子欧  乔东海  赵元艺 《岩石学报》2020,36(9):2785-2798

位于西藏多龙矿集区的荣那铜金矿床是班公湖-怒江成矿带首例斑岩型-浅成低温热液型矿床,它的发现对于班公湖-怒江成矿带找矿模型的构建以及资源潜力评估有着重要意义。本文以荣那矿床ZK3204岩芯钻孔为研究对象,针对其蚀变矿物,运用短波红外光谱测试技术,并结合金属矿物组合以及黄铁矿LA-ICP-MS原位微量元素特征,以期查明其矿床成因,并为深部资源勘查提供理论依据。短波红外光谱测试显示出ZK3204钻孔蚀变矿物垂向分带组合为:高岭石+(地开石)→高岭石+伊利石→高岭石+(地开石+石膏)→高岭石+绢云母+伊利石→高岭石+伊利石+(叶腊石)+(地开石),金属矿物也从Cu-S体系逐渐转变为Cu-Fe-S体系。通过黄铁矿LA-ICP-MS原位微量元素分析发现,黄铁矿可分为四类,分别对应荣那矿床四个成矿阶段:(1) Py I:Co、Ni、Cu、Ag、Au含量较低,Co/Ni显示为沉积成因,代表成岩期黄铁矿;(2) PyⅡ:Co、Ni含量较低,Cu、Ag、Au含量较高,Co/Ni显示为沉积成因,代表第一期斑岩型矿床成矿期黄铁矿;(3) PyⅢ:Co含量较低,Ni、Cu、Ag、Au含量较高,Co/Ni显示为沉积成因,代表第二期斑岩型矿床成矿期黄铁矿;(4) PyⅣ:Cu、Ag、Au含量较低,Co、Ni含量较高,Co/Ni显示为热液成因,代表浅成低温热液矿床成矿期黄铁矿。风化作用也是荣那矿床重要地质过程,贯穿于各成矿阶段,反映为早白垩世班公湖-怒江洋盆向北俯冲消减大背景下的多龙矿集区隆升事件,导致矿床被大量剥蚀,也使黄铁矿显示沉积成因。荣那矿床目前仍有较大找矿潜力,在钻孔深部(815m以下),黄铁矿Cu、Ag、Au含量,钻孔中Cu、Pb、Zn、Cr、Hg等含量,绢云母、伊利石含量以及铜金矿的矿石品位均有向下升高的趋势,说明在ZK3204钻孔下部仍有巨大的找矿潜力,可作为未来深部资源探测的重点对象。  相似文献   

全球石墨资源分布与供需格局变化分析     

刘艳飞  颜玲亚  高树学  欧阳友和  陈正国  陈军元 《地质论评》2020,66(S1):129-131

  相似文献   

Disturbance,Trait Similarities,and Trait Advantages Facilitate the Invasion Success of Alternanthera philoxeroides (Mart.) Griseb.     

《洁净——土壤、空气、水》2017,45(9)

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深井电极交叉供电对自然电位的影响     

赵斐  叶青  张远富 《地震地磁观测与研究》2017,38(3):93-99

通过实验论证平凉地震台深井电阻率观测自然电位畸变由电极交叉供电造成,讨论分析不同电极供电对自然电位的影响。结果表明:对测量极供电,会影响自然电位,不会影响电阻率测值;单极供电对自然电位的影响表现为阶跃突跳,并以指数形态恢复,恢复时间约10 h,干扰峰值与供电电流、供电时间等有关;对观测数据进行校正,取得较好效果。  相似文献   

Migrant pathways to resource access in Lampung’s political forest: Gender, citizenship and creative conjugality     

Rebecca Elmhirst 《Geoforum》2011,42(2):173-183

An important theme in studies of enclosure and resource access in Southeast Asian hinges on the concept of the ‘political forest’, a particular constellation of power constituted by ideas, practices and institutions that seek to regulate peoples’ access to resources, providing recognition and legitimacy to some, whilst excluding and criminalizing others. Whilst issues of class and ‘race’ underpin work in this vein, in Indonesia, much less attention has been directed towards the ways in which gender inheres in the regularisation of land and livelihood, and the ordering of upland spaces. Drawing on recent feminist and queer theorizing of the links between citizenship, recognition and hetero-normativity, and on analyses of the social relationships through which resource access is negotiated and realized, the paper presents a feminist political ecology of the gender dynamics inherent in the power plays of resource access as land-poor rural migrants negotiate a shifting landscape of enclosure in Lampung province. Through an analysis of three periods of resource governance and control in the province, the paper shows how the negotiation of resource access is simultaneously a process of self-regulation and subject-making that draws on particular ideas about family and conjugal partnership, inculcating gendered and hetero-normative ideologies of the “ideal citizen”. Through particular representational strategies - positionings - necessary to qualify for resource access, and through the material practices necessary to realize the benefits of resource access, conjugal partnership is reiterated and remade as an important social relationship through which resource access may be realised, for men as well as for women.  相似文献   

Comparative Study of Magmatism in East Pacific Rise Versus Nearby Seamounts: Constraints on Magma Supply and Thermal Structure Beneath Mid‐ocean Ridge   总被引：1，自引：0，他引：1  

ZHANG Guoliang 《《地质学报》英文版》2011,85(6):1286-1298

Major elements of 2202 basalts from the East Pacific Rise (EPR) and 888 basalts from near-EPR seamounts are used to investigate their differences in magma crystallization pressures and mantle melting conditions. Crystallization pressure calculation from basalts with 5.0wt%相似文献