关于湖南省找富锰矿方向的探讨     

孙家富 《地质与勘探》1993,29(10):13-15

湖南省锰矿开采历史悠久。已发现的锰矿成因类型有：海相沉积锰矿床（占全省保有储量５３．３９％）、沉积受变质锰矿床（占４．７％）、层控铅锌铁锰矿床（占２６．２８％）、风化锰矿床（占８．８７％）。湖南锰矿以碳酸锰贫矿为主，贫中找富是主要找矿方向。中列举了主攻的找矿类型和工作方法。  相似文献   

关于推覆—褶皱构造术语的几点建议     

М.  ОА 《国土资源信息化》1989,(6):2-5

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金矿床的热液流体特征研究     

王建国  孙丽娜  赵玉山  侯根群  赵纯福 《国土资源》1993,(4)

通过对中国东部金成矿区域地质特征的分析,根据氢氧同位素及流体包裹体数据特征,表明中国东部金矿床成矿流体主要来自大气降水,其次为变质作用过程释放的水和岩浆分异水;成矿金属组分主要来自太古宙变质岩系。  相似文献   

据封闭面对圈闭类型的新分类     

Milt.  NJ 辛文锋 《海洋地质译丛》1993,(1):43-53

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简论龙门山南段末端地区构造发展史     

林茂炳 《成都地质学院学报》1993,20(3):46-51

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今后几年的月球探测和月球科学     

平劲松  花田英夫  日置幸介  坪川恒也  菅野贵之  河野裕介  松本晃治  河野宣之  岩田隆浩 《天文研究与技术》2003,(1):119-125

近年来月球探测已经进入了一个全新的时代。特别是 1 990年以来 ,多个月球探测计划已经被成功实现 ,而且另外还有多个探测计划也在准备当中 ,并将在未来的几年内发射升空。在这种背景之下 ,中国的航天机构和有关的科学家也开始积极酝酿和开发自己的月球探测计划。这些月球探测计划将利用卫星上搭载的各种仪器探测和测量月球的地质和地理特性、化学成分和矿物组成、月球物理学特征以及包含地球大气在内的地月空间环境和行星际空间环境 ;进一步研究月球的起源和演化 ,探明月面环境 ,研究太阳等离子体物理 ,提供月面天文台和月面长期科研基地的候选地址 ,调查月球上的可利用资源 ,为将来开发月球提供充实的背景资料。参与新一轮的月球探测同样也为中国天文学研究带来了新的机会。  相似文献   

城市发展的"克星"     

任叙新  王奕勘 《南方国土资源》2003,(4):21-22

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Mantle processes during ocean formation：Petrologic records in peridotites from the Alpine－Apennine ophiolites     

GiovanniB.Piccardo 《《幕》》2003,26(3):193-199

Mantle peridotites were early exposed at the sea-floor of the Jurassic Tethys derived from the subcontinental mantle of the Europe-Adria system. During continental rifting and oceanic spreading, these lithospheric peri-dotites were percolated via diffuse reactive porous flowby melt fractions produced by near-fractional melting of the upwelling asthenosphere. Ascending melts inter-acted with the lower lithosphere, dissolving pyroxenes and precipitating olivine, and crystallized at shallower levels in the mantle column causing melt impregnation.Subsequent focused porous flow formed replacive dunitechannels, cutting the impregnated oeridotites, which were conduits for upward migration of MORB-type liq-uids. Melt migration produced depletionlrefertilization and significant heating of the percolatedlimpregnated mantle, i.e the thermochemical erosion of the litho-sphere. Impregnated and thermally modified lithos-pheric mantle was cooled by conductive heat loss dur-ing progressive lithosphere thinning and was intrudeaby MORB magmas, which formed Mg-rich and Fe-richgabbroic dykes and bodies. Alpine-Apennine ophiolitic peridotites record the deep-seated migration of melts which changed their compositions and dynamics during the rift evolution. The thermochemical erosion of the lithospheric mantle by the ascending asthenospheric melts, which induces significant compositional and rhe-ological changes in the lower lithosphere, is a major process in the evolution of the continent-ocean transi-tion towards a slow spreading oceanic system.  相似文献   

广东地方性氟中毒的类型,分布与防治对策     

周亮津 《广东地质》1993,8(2):21-27

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The Statistical Analysis of Migration of Strong Earthquakes-Taking the North China Region asan Example     

QinChengzhi ZhouChenghu PeiTao LiQuanlin 《中国地震研究》2004,18(2):178-187

The migration of strong earthquakes is an important research topic because the migration phenomena reflect partly the seismic mechanism and involve the prediction of tendency of seismic activity. Research on migration of strong earthquakes has mostly focused on finding the phenomena. Some attempts on getting regularity were comparatively subjective. This paper suggests that there should be indices of migration in earthquake dataset and the indexes should have statistical meaning if there is regularity in the migration of strong earthquakes. In this study, three derivative attributes of migration, i.e., migration orientation, migration distance and migration time interval, were statistically analyzed. Results in the North China region show that the migration of strong earthquakes has statistical meaning. There is a dominant migration orientation (W by S to E by N), a dominant distance ( ≤ 100kin and on the confines of 300 ～ 700km), and a dominant time interval ( ≤ la and on the confines of 3 - 4a). The results also show that the migration will differ slightly with different magnitude range or earthquake activity phase.  相似文献