野战条件下快速洗井抽水装置的研制

根据野战条件下快速成井的要求,研制了一种快速洗井抽水装置。介绍了该装置的工作原理、结构特点和实际应用情况。该设备可实现钻井与洗井分离,具有效率高、操作方便,可适用于200 m以浅的新井和旧井的洗井。     

Kinematics and age constraints of deformation in a Late Carboniferous accretionary complex in Western Junggar,NW China

The Karamay area, situated in the eastern part of Western Junggar, Southern Altaids, contains an ophiolitic mélange with ultramafic rocks, gabbro, basalt, chert and limestone, which show typical block-in-matrix structures, and coherent turbidites and tuffs. These lithological associations are interpreted as incoherent and coherent series formed in an accretionary complex. On the basis of detailed field mapping and analyses of the asymmetry of imbricate thrusts, duplexes, tilted structures, shear band cleavages, and the NW-verging inclined to overturned folds, we conclude that the overall movement in the accretionary complex was top-to-the-NW. The youngest tuff involved in the deformation contains detrital zircons that have a U–Pb age (LA-MC ICP-MS) of 308 ± 7 Ma. ³⁹Ar–⁴⁰Ar resistance furnace step-heating of amphibole separates from a diorite dike, which cuts the folded and imbricated rocks in the accretionary prism, yielded a plateau age of 307 ± 2 Ma. Consequently, the age of the deformation in the prism is tightly constrained at 307–308 Ma, implying that the deformation occurred in an extremely short time-span during SE-ward subduction. Combined contemporaneous occurrence of Baogutu adakite, high-Mg, Sr-enriched and Y-poor dioritic dikes, Miaoergou charnockite, and Maliya mafic rocks, we further suggest the accretionary complex was cut by near-trench volcanic rocks and plutons possibly due to interaction with a spreading ridge.     

Re–Os Isotopic Age of the Hongqiling Cu–Ni Sulfide Deposit in Jilin Province,NE China and its Geological Significance

The Hongqiling Cu–Ni sulfide deposit in central Jilin Province is located in the eastern part of the Central Asian Orogenic Belt. Rhenium and osmium isotopes in sulfide minerals from the deposit are used to determine the timing of mineralization and the source of osmium, and ore metals. Sulfide ore samples have osmium and rhenium concentrations of 0.28–1.07 ppb and 2.39–13.17 ppb, respectively. Ten analyses yield an isochron age of 223 ± 9 Ma, indicating that the Cu–Ni sulfide deposit in the area formed in the Triassic. The initial ¹⁸⁷Os/¹⁸⁸Os ratio is around 0.295 ± 0.019 (MSWD = 1.14) and the δ³⁴S values of sulfide ores vary from ?1.50 to +3.00‰. These data indicate that the mineralizing materials were derived mainly from a mantle with some quantities of crustal components introduced into the rock‐forming and ore‐forming systems during mineralization and magmatic emplacement.     

贵州织金县新华磷矿大戛矿段矿床特征及成矿

阐述了织金县新华磷矿大戛矿段地质背景和特征,在对区域地质的研究基础上,通过对矿体形态特征、矿石结构构造、成分分析,总结出该地区成矿条件,矿体往深部还有较大延伸空间,矿床深部具有较大的资源远景。     

高学历人才逆向梯次迁移现象及机制研究——以北上广深应聘至武汉的中小学教师为例

本文聚焦于高学历人才“逆向梯次迁移”现象,基于武汉市中小学教师招聘考试数据,运用二元Logistic回归模型分析正规就业驱动下北上广深至武汉的高学历人才逆向梯次迁移,结合粘性理论解释其机制。结果表明：(1)正规就业导向下,高学历人才逆向梯次迁移已成为人才迁移的重要趋势之一,以武汉为目的地的跨省城际迁移中近1/4呈现逆向梯次迁移意愿,非应届生占比高于应届生。(2)“逆向梯次迁移”受粘性因素、个人因素和城市因素影响。粘性因素即“户籍地粘性”与“就学地粘性”起到关键作用;包括“年龄”“毕业学校级别”“学历级别”和“户籍地所在城市级别”在内的个人因素和城市因素也存在影响。(3)与西方受宗教、种族、家庭和个人价值等因素影响不同,基于乡缘、学缘关系产生的户籍地、就学地粘性更深刻作用于中国的高学历人才择业迁移选择,引发逆向梯次迁移现象。     

大型自动气象站探测网络实时监控系统的设计和实施

介绍了使用VB6.0语言设计Windows版本监控软件，以及监控系统所需的以微处理器80C320为核心、C51编程语言设计智能多功能MODEM的设计方法，说明了系统基本构成和实施思路。利用X．25通信技术，实现了对大型自动气象站探测网络的实时监控。     

Rhenium-Osmium Isotope Constraints on the Origin of the Tianyu Cu-Ni Deposit in the East Tianshan Orogenic Belt, Xinjiang, NW China

The Tianyu Cu-Ni sulfide deposit occurs in the north margin of the Central Tianshan Arc in East Tianshan orogenic belt, Xinjiang, NW China. The intrusions consist of gabbro, peridotite, and olivine pyroxenite. The peridotite and pyroxenite are the main host rock for the Cu-Ni ores. Rhenium and osmium isotopic analyses of Ni- and Cu-bearing sulfide minerals from the deposit have been used to determine the source of osmium, and by inference, the sources of ore metals. Sulfide ore samples have Os and Re concentrations varying in the ranges 1.85 to 4.58 ppb and 93.56 to 146.00 ppb, respectively. An initial 187Os/188Os ratio ranges from 0.86 to 1.23 for the ores and the γOs values from 592 to 2227. Osmium isotopic data suggest that the Tianyu intrusion and associated Cu-Ni mineralization has derived from crustal-contaminated mantle melts. The intrusions early show island-arc geochemical signatures, which indicate that the Hulu mafic–ultramafic intrusions, along with the Cu-Ni deposit, formed as a result of subduction of oceanic crust in the Early Permian.     

GPS控制网在高标准农田建设中的布设研究

制订一套合理的GPS控制网实施方案对高标准农田建设具有重要意义。本文以贵州省安顺市西秀区的东屯乡、旧州镇和双堡镇为例,基于GPS相对定位原理以及GPS控制网的布设方案,介绍了GPS控制网在高标准农田建设中的实施应用。可为其他高标准农田建设提供参考,进一步提高工作效率、节约建设资金。     

Geochemical and isotopic constraints on the role of juvenile crust and magma mixing in the UDMA magmatism,Iran: evidence from mafic microgranular enclaves and cogenetic granitoids in the Zafarghand igneous complex

International Journal of Earth Sciences - The Zafarghand Igneous Complex is composed of granite, granodiorite, diorite, and gabbro that contain many mafic microgranular enclaves. This complex was...     

国家基础测绘1∶50000地形数据更新方法探讨

为更好地满足国民经济社会发展和生态文明建设、国防建设以及自然资源管理对地理信息更新服务日益提高的需要,多年来,国家基础测绘不断提升数据的丰富性、现势性以及可靠性,建立完善的适用于我国国情的基础地理信息更新技术与业务体系,管理体制与运行机制,实现了一年更新一次.本文主要针对国家基础测绘1∶50000地形数据更新的技术路线及流程、生产方法进行了总结和思考,并提出了今后如何开展的思路及建议,以期为1∶50000地形数据更新下一步的工作开展提供借鉴.