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高原隆升及剥蚀作用的复杂性与区域差异性以及高原恶劣的气候、地理条件，使得在青藏高原空白区1：25万区域地质调查中进行地貌年代学研究具有很大的现实意义。由于地貌是高原隆升、环境演化、新构造运动等的信息载体，地貌年代有助于重塑这些地质作用的发生时间及发展过程，因此地貌年代学研究具有重要的技术意义。1：25万银石山幅的工作表明，地貌年代学调查对高原隆升及环境演化过程研究具有良好效果。 相似文献
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1：25万民和回族土族自治县幅是中国地质调查局于2002年在全国首批启动数字区域地质调查试点项目。目的是通过1：25万民和县幅试点性数字地质填图，建立和完善1：25万整幅数字地质填图的“实战”技术要求，为计算机野外填图系统软件和硬件开发与升级、国际交流提供资料和依据。 相似文献
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基于地质建造的生态地质调查方法——以河北省承德市国家生态文明示范区综合地质调查为例 总被引：1，自引：0，他引：1
生态地质（学）是研究生态与地质环境相互关系及作用机理的科学。通过“承德市国家生态文明示范区综合地质调查”项目的实践，探索总结出一套适合山区、基于地质建造的生态地质调查思路和技术方法框架。按照全域背景（基准）调查—重点小流域调查—生态关键带解剖3个层次开展工作，逐步深化对承德市生态地质特征和作用规律的认知。通过全域1：25万地质建造分析与编（填）图，查明生态地质背景，划分生态地质单元，快速筛选生态资源优势区和生态环境问题区；针对筛选出的生态资源优势区和生态环境问题区，开展以小流域为单元的重点区1：5万调查，以查明优势资源特征，评价生态环境风险；开展重要地质建造典型生态关键带1：1万调查与研究，揭示生态地质系统三维结构特征和相互作用机理，为综合监测和生态系统演变趋势预测提供依据。构建了生态地质调查“需求—调查—转化”体系框架，依据生态地质调查成果，为承德市国土空间规划、生态产业发展和生态保护修复，提出了相应的地学建议。 相似文献
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本文介绍的锑多金属矿点是在1：25万西藏自治区邦多、措麦区幅区域地质矿产调查中发现的，文中初步总结了该区地质概况、矿化特征及其找矿意义，为在班公错-怒江缝合带上寻找中低温热液矿床具有很好的批示意义。 相似文献
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位于死亡之海——罗布泊东缘地区的新疆笔架山幅1：25万区域地质调查项目，由西安地质矿产研究所基础室承担。两年多来，项目组全体人员克服干旱炎热、缺水、交通艰难及狂风沙暴等极度恶劣条件的影响，圆满完成了任务书和设计书规定的各项任务，获得了珍贵的第一手地质资料。2004年6月23日—7月1日西安地调中心技术处聘请有关专家在甘肃省安西县瓜洲宾馆对北山地区3幅(笔架山、玉门镇、红石山)1：25万区调项目进行了野外验收，专家组在听取项目野外工作汇报、提问答疑和室内比较全面的实际资料抽查后，赴野外实地进行了路线地质和实测地质剖面抽查，认为新疆笔架山幅(K46C004002)1：25万区调项目实施的全过程重视并加强了新技术、新方法应用，发挥遥感影像视域广阔优势。 相似文献
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Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
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Jiayu Rong Michael Melchin S. Henry Williams Tatyana N. Koren Jacques Verniers 《《幕》》2008,31(3):315-318
The Global Stratotype Section and Point （GSSP） for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Subcommission on Silurian Stratigraphy （SSS） proposed undertaking a formal restu@ of this GSSP, which was subsequently approved by the International Commission of Stratigraphy （ICS）. The result of this restudy was the formal proposal that the current GSSP, at 1.6 m above the base of the Birkhill Shale, at Dob＇s Linn, Scotland, should be maintained as the same locality and stratigraphic level, but the bios- tratigraphical definition of the boundary should be revised. The previously defined, basal Silurian grapto- lite zone, the Parakidograptus acuminatus Zone, should be subdivided into a lower Akidograptus ascensus Zone and a higher E acuminatus Zone. The base of the A. ascensus Zone, marked by the first appearance of A. ascensus, should be regarded as the biostratigraphic mark for the base of the Silurian. This proposal has now been formally approved by the SSS and ICS, and ratified by International Union of Geological Sciences. This is the first GSSP to undergo formal restudy and redefini- tion, and the proposal also included a recommended procedure for restudy of GSSPs. 相似文献
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Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
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Important tendencies in development of the world mineral-resources sector at the beginning of the 21st century were an increase in production and consumption of mineral materials differentiated by types of metals and nonmetallic mineral raw materials, by countries and regions, as well as the concentration of the production of mineral raw materials in a small number of countries, and a reduction in industrial reserves of minerals in the world economy, even at the current stage of their extraction. These tendencies should be taken into account in working out a strategy for development of the Russian mineral raw-material base. 相似文献
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Fouad N. Ibrahim Dr. 《GeoJournal》1988,17(1):133-141
Taking the example of W Sudan, an analysis of the climatic incidents leading to the two recent famine disasters is made. On this natural background, the human side is investigated. Focus is directed towards the fragile economic structure of the famine-prone population groups. An early-warning system for famine in the Sahelian Zone is proposed taking grain production and storage, livestock development and the relationship between the prices of livestock and grain as major indicators. 相似文献
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东濮凹陷北部沙三中亚段广泛发育盐岩和烃源岩,这两个看似不能共存的物质却在这里互层共生。该时期研究区沉积特征为多盐韵律与多层烃源岩互层共生、连续沉积,单个盐韵律厚度从几米到十几米,烃源岩有机质丰度高、类型好。平面上,两者在湖盆沉积沉降中心共生;垂向上,高有机质丰度、好干酪根类型与高盐度地层具有较好的对应关系。因而成为恢复古气候和古环境的重要研究对象。通过岩石学、古生物学以及Sr/Ba、B/Ga、(V+Ni+Mn)、Fe/Mn、Sr/Cu、Mg/Ca、V/(V+Ni)、稀土元素含量和氯同位素等方法对凹陷北部沙三中亚段的沉积环境进行研究。结果表明,凹陷北部沙三中亚段为深水沉积的还原环境,古盐度较高,达到半咸水-咸水沉积;微量元素和孢粉化石特征表明研究区沙三中亚段为温暖潮湿的环境。 相似文献
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The structure of the eastern Pyrenees consists mainly of south-directed thrusts involving basement and cover rocks. An antiformal stack developed by the piling up of basement thrust sheets which outcrop in the Axial zone. These structures account for a thin-skinned thrust model rather than a vertical fault model in which the Axial zone would be essentially autochthonous, and the North-Pyrenean fault the axial plane of a fan thrust system. New data from the Eastern Pyrenees and the thin-skinned model suggest that(1) the structure east of the Pedraforca nappe is similar to that of the Central Pyrenees; (2) the cover rocks of the South-Pyrenean units and of the Axial zone-after restoration—built up a northwards-thickening prism consistent with the existence of a unique Pyrenean sedimentary basin during Mesozoic time; (3) the Axial zone is only a complex antiformal stack developed as a part of South-Pyrenean system related to the Paleogene thrusting-tectonics. The Axial zone palaeogeographic area had no special meaning during Mesozoic time. 相似文献
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郯庐断裂南段研究进展与断裂性质讨论 总被引：13，自引：3，他引：13
据1：5万区域地质调查和专题研究资料，就郯庐断裂带是否南延与消失的原因，其与大别—苏鲁造山带交截形成的假位错效应，以及与中新生代沉积盆地形成演化的关系等作了新的阐述。在此基础上，讨论了郯庐断裂带是否为巨大的左行平移断层或转换断层。认为郯庐断裂带可能是在“古郯庐带”的基础上于早侏罗世重新活动、白垩纪强烈活动的地堑型枢纽断裂带。 相似文献