共查询到20条相似文献,搜索用时 312 毫秒
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通过对纳岭沟地区伽马、综合测井等参数的研究分析,加强地层物性参数特征对比,总结该地区各地层不同岩性的不同参数变化规律和曲线形态,能够较准确划分岩性、确定标识性岩性位置、进一步研究测井相和地层放射性特征;目的层直罗组下段为辫状河沉积,直罗组上段为曲流河沉积,直罗组内部不同岩性依据三侧向电阻率和密度值可以进行准确识别与划分。为该地区铀矿地质工作从事生产实践、提高工作效率提供具指导性的参数数据,为进一步铀矿找矿工作打下基础。 相似文献
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通过对研究区岩性、构造等地质特征及放射线异常特征的分析,研究了学堂坳地区铀矿潜力,研究表明学堂坳地区铀资源较为丰富,是长江矿田地区铀矿找矿的重要地段之一,是我国重要的花岗岩铀矿床聚集地。 相似文献
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东昆仑地区出露大面积多期次的岩浆岩体,构成一条巨大的岩浆岩带。通过对东昆仑近年来获得的印支期中酸性岩浆岩锆石U-Pb及部分39Ar-40Ar测年结果的分析,东昆仑印支期岩浆岩可以分为早期和晚期2个形成阶段。早期中酸性岩浆岩形成于260-230Ma左右,岩性主要为英云闪长岩、花岗闪长岩和二长花岗岩;晚期中酸性岩浆岩形成于230-195Ma左右,岩性主要正长花岗岩和二长花岗岩。这些广泛分布的中酸性岩浆岩表明东昆仑地区在印支期经历了复杂的岩浆和构造作用过程,早期岩浆岩的形成与东昆仑洋壳大规模俯冲碰撞有关,晚期岩浆岩的形成与东昆仑碰撞后的伸展作用有关。 相似文献
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Weathering processes in the Ellsworth Mountains of Antarctica are dominated by frost action. These processes were observed to be different on the same group of marbles under different slope conditions. North- and south-facing walls of the bedrock showed the same shattering rate in the summer of 1992–1993. Frost shattering of rocks is controlled by surface temperature, moisture, and the physical properties of the rock. The most important control on frost shattering in this area was moisture availability, given the same bedrock and freeze-thaw cycle. Snow particles are moved by katabatic winds, bringing moisture to the rock. Moisture is collected mainly in lower cliffs and cols. [Key words: weathering, marble, moisture conditions, Antarctica.] 相似文献
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《极地研究》1992,3(2):1-7
Some weathering observation sites were set up at different height and face in Great Wall Station area of King Geroge Island, Antarctica, since 1989. Baced on the data series obtained from 1987-1991, the relationship between physical weathering of rock and season, height, face are discussed in this paper. We also compare the results to that of other periglacial area in the world in order to know the special features of King George Island in physical weathering of rock. The rock weathering in south-east face of sea stack is higher than that of north-west face in same environment. Get rid of influence of elevation, rock type, weathering time and organisms, the main reason which caused physical weathering of this area is climate and orientation of rock. The King George Island of Antarctica belong to high latitude area. The temperature time of below zero is 6-8 months in a year, so the process of freeze-thow is restricted. Compared with other periglacial area in the world, the weathering rate of rock is midd 相似文献
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本文通过对长城湾表层沉积物中稀土元素的地球化学研究,认为其总量丰度、配分模式、特征参数等,均与菲尔德斯半岛的火山岩相似,因而长城湾沉积物的主要来源似为菲尔德斯半岛基岩的风化产物。 相似文献
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南极洲的政治前景问题,即南极洲向何处去,或南极洲属于谁的问题。就这个问题的核心和实质而言,也可以说是在新的世界政治、经济格局中和南极条约体系运作的框架下,人类将如何应对和寻求解决南极洲的领土主权归属和资源开发利用的问题。自南极洲发现至今,乃至将来,这一问题都是各国政治家、外交家和社会历史学家们十分关注而又极难应对的棘手问题,也是人们普遍关注的热点问题。由于南极洲独特的自然地理、生态环境、富有资源的特殊性和政治背景的复杂性。时至今日,对南极洲国际事务处理和管理的最好办法,仍然是《南极条约》和南极条约协商国组织及其会议。那么,南极洲究竟属于谁呢?可以肯定,在相当长的时间里是很难找到肯定答案的。本文着重分析了过去和现在决定或影响南极洲政治前景的三种力量,尝试对“南极洲的政治前景”作一探索分析,以期对关注这一问题的人们有所裨益。 相似文献
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西南极南设得兰群岛乔治王岛菲尔德斯半岛土壤化学分析表明土壤中存在着一定的化学风化作用。相对于母质,土壤中的SiO_2、Al_2O_3、Fe_2O_3、FeO、MgO,GaO和Na_2O淋失,K_2O、H_2O~+、H_2O~-、TiO_2和P_2O_5富集。土壤中SiO_2/Al_2O_3的平均值为4.71,属弱风化壳类型。硅铝比反映出成土作用时间越长,土壤的风化程度越高,化学风化作用大于南极大陆边缘和内部。Al_2O_3在南极的淋失率大于SiO_2,使较老土壤剖面由下向上硅铝比增大。土壤的化学性质很大程度上取决于母质。南极强烈的冻融扰动作用破坏了土壤分层。土壤中存在着较强的水合作用。 相似文献
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《极地研究》1992,3(2):8-27
The chief aim of this study is to investigate the chemical weathering process of the weathering crust in Great Wall Station region of China (in Fildes Peninsula), Antarctica by the method of sedimentology. CW,SW,GW,TW,WE weathering crusts developed on volcanic clastic rock, gray aptitic basalt with tuff or basaltic bedrock. On change of minerals, geochemical behaviors of elements, migration and enrichment regularities of elements, Correlation between element geochemical behaviors, change of weathering potential of rocks in chemical weathering process are studied by us. We can see that the sequence fo weathering strengths of the abovementioned sections, from high to low, should reflected in TW, GW, CWand SWF and basical correspond with that calculated from the enrichment and differentiation indexes. 相似文献
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根据南极火成岩信息和数据类型多、数据关系复杂、样品间数据完整性和精度差异大的特点,中国南极火成岩数据库划分为主库、来源文献、岩体地质学、岩石学、主要氧化物、稀土元素、痕量元素和同位素8个数据库。通过岩体系统号、样品系统号和来源文献号三个字段使8个数据库相互关联。中国南极火成岩数据库包括了140多个基本字段,存储火成岩岩石描述信息和分析数据。根据国内外火成岩数据标准化的现状的分析,中国南极火成岩数据库采用了国际地科联岩石学数据库分委会规定的标准词汇和代码,并利用代码-名词术语转换技术改善了用户界面 相似文献