昆明盆地第四纪沉积物粒度特征及沉积环境分析

本文利用昆明盆地钻孔的粒度资料,分析了粒度频率曲线、粒度参数、概率累积曲线等粒度特征,探讨了昆明盆地第四纪沉积环境演变的过程。结果表明昆明盆地沉积物的频率曲线主要为单峰形态,双峰曲线在个别时期较集中。概率累积曲线均为两段式。平均粒径多介于5～7Ф之间。四分位离差值多在0.6～1.4之间。偏度多属于正偏,只有少数为负偏。峰态值主要集中在0.9～1.56范围之内。通过分析得出昆明盆地第四纪沉积环境模式：更新世早期为河流相-滨湖相;更新世中期为滨湖相-滨浅湖相-滨湖相-河流相;更新世晚期至今为河流相-滨湖相-滨浅湖相-滨湖相-河流相。     

长江下游芜湖地区新构造运动基本特点

芜湖地区以长江为界,西北部为冲积平原,东南部为低山丘陵。在低山丘陵区,冲沟多为宽平的"U"型谷。长江沿岸Ⅰ、Ⅱ级河流阶地以堆积阶地为主,局部见有侵蚀阶地。新生代地层主要发育中、晚更新世及全新世地层。新近纪以来,出现2次明显的沉积间断。第1次发生在上新世和第四纪之间,表现形式为洞穴流水沉积间断,溶洞普遍抬升。第2次发生在中、晚更新世之间,表现形式为构造隆升,持续时间约340ka。新生代以来构造运动以升降差异活动为主,断裂活动和褶皱作用不明显。新构造运动的基本特点是继承性、差异性和间歇性。早期活动以继承性为主,晚期活动差异性表现比较突出;而间歇性运动基本上贯穿整个新构造时期。根据地质地貌、断裂活动和测年数据,该区新构造运动的起始时代在上新世末期至第四纪初期。     

漳州第四纪地层特征与古气候分析

漳州第四纪沉积物主要分布于区内九龙江流域两侧及漳州东南部,根据工作区地貌特征,在区内施工了13个钻孔,以钻孔岩性、沉积相、沉积旋回、孢粉、光释光等为依据,系统地总结了区内第四纪地层特征及沉积环境变化,分析了全新世以来古气候演化。     

淮南含煤区上古生界沉积环境演化研究

运用煤地质学、沉积学方法研究了淮南含煤区石炭-二叠系的主要岩石类型及岩性特征,分析了矿区上古生界的沉积环境,厘定出了淮南含煤区晚古生代地层发育的四类沉积体系:碳酸盐台地沉积体系、障壁—潟湖—潮坪沉积体系、浅水三角洲沉积体系,以及河流—湖泊沉积体系;探讨了南华北盆地淮南含煤区晚古生代的岩相古地理特征及盆地演化序列,并分析了该区的沉积相和沉积模式。     

嘉禾县袁家矿区浦溪井田龙潭组沉积环境分析与找煤

嘉禾县浦溪井田位于袁家矿区中段,其煤系地层龙潭组为一套湖沼—泻湖海湾过渡相为主的沉积,厚度14.9～335m,含煤7层,煤层总厚5.25～7.85m;根据岩性、岩相特征分为上下两段,下段为不含煤段,为泻湖相沉积,平均厚187m,上段泻湖—湖沼相沉积,平均厚137m,并形成了泥炭沼泽,形成了2、3、4、5、6、7号煤层,可采煤层为2、5、6号煤层,其中,形成于滨海沼泽地区的5煤层厚度稳定,是该地区主采煤层,下段厚度比上段厚度要大,反映了该区晚二叠世期间地壳沉降不均衡,沉积环境差异是本区找煤条件的主要控制因素。     

基于钻孔资料的北京平原区第四纪地层分析

北京市地处华北平原的北部,平原区的第四纪地层非常发育,而且厚度大。由于北京市平原区活动构造发育,曾经发生过一些大地震,因此对该区的第四纪地层研究一直受到重视。本文通过总结前人研究成果,结合钻孔资料,建立了第四纪地层划分方案,对第四纪各统厚度进行了统计与划分,从构造与沉积角度对第四纪地层的沉积类型及平面展布进行了分析。总来说,西北部天竺镇附近是研究区内贯穿于整个第四纪各时期的沉积中心。沉积中心位置在各个时期有所调整,但始终是厚度最大的沉积区。东南部的牛堡屯沉积中心自下更新统,厚度逐渐减薄。西北部的马池口-沙河沉积中心自上更新世开始发育,在中更新世及上更新世沉积达到最大规模。研究区的沉积厚度,呈现了北东部较厚、西南部较薄的特点。     

宁县付家山延安组沉积环境及控煤因素分析

付家山勘查区含煤地层为中侏罗统延安组,煤系地层及煤层沉积受沉积环境影响较大。延安组沉积早期以河流相为主,沉积了厚度较大的煤8层,沉积中期随着湖侵,覆水加深,过渡为三角洲平原相,沉积了厚度较薄、但分布面积较广的煤6层,之后沉积了厚度分布范围较小的煤5层,到延安组沉积晚期,以湖泊相为主,仅沉积了不可采的煤2层。受基地同沉积褶皱控制,在低洼区煤系地层及各煤层沉积厚度均较大,煤层夹矸层数较多,而在相对高的区域,煤系地层及煤层均变薄或尖灭。文章主要探讨延安组沉积环境及控制因素,对该勘查区煤炭的研究和后续生产具有一定的指导作用。     

湖北石花镇红山地区晚震旦世地层特征及其对比初探

本文从岩石地层学入手，初步理顺了该区晚震旦世的地层层序，并对其岩石学特征、成岩机理、环境、古生物面貌及地层对比进行了探讨，认为区内的陡山沱组和灯影组与扬子型晚震旦世地层在岩性特征、沉积类型和古生物组合方面相类似。     

黑垆土的地层意义及其工程性质

黑垆土是第四纪黄土层中独具的一种地层。它是划分全新世(Q_4)和晚更新世(Q_3)地层的标志层,也是湿陷性黄土层中可做为良好地基的一种地层。本层广泛埋藏在黄土分布地区。以六盘山为界,在其以西的黄土区,色调淡,厚度薄,肉眼鉴别较为困难;在其以东的黄土     

贵州织金矿区晚二叠世地层的地球化学特征

对织金矿区晚二叠世碎屑岩与碳酸盐的沉积特征信岩石中的Ｂ，Ｇａ，Ｃｒ，Ｂａ的含量与其它微量元素含量的分布，进行了对比分析，并且结合上述地层中的生物组合及化石进行了地球化学特征与沉积环境的分析与探讨，从而推断当时的沉积环境为过渡相偏海相的沉积特征。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586