上海联诚综合大楼基础类型及持力层选择的工程地质论证     

刘唐生  王生力 《河北地质学院学报》1996,19(1):59-65

软土作为地基，在工程实际中往往会遇到不少问题。本文以上海联诚综合大楼的岩土工程勘察为例，重点分析了软土基础类型，砂土液化及持力层的选择等问题，这对相同类型的建筑物有一定的参考价值。  相似文献   

康定—攀枝花地区金矿化类型及分布规律     

慕纪录  李葆华 《成都理工学院学报》1996,23(3):107-112

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康滇地轴中南段元古代地层中铀矿化类型及其特征   总被引：1，自引：0，他引：1  

钱法荣 《铀矿地质》1996,12(4):214-219

本文将康滇地轴中南段元古代地层中的铀矿化划分为３种类型（砂岩型、钠交代岩型和浅变质岩型），其中以钠交代岩型为主，并具有一定的找矿前景。而众所关注的中、上元古界不整合面型铀矿化至今未找到，初步认为其生成条件较差，找矿前景不乐观。  相似文献   

淮南谢—矿煤的组成对甲烷吸附性的影响     

姚多喜 《中国煤田地质》1996,(Z1)

从淮南谢—矿五层煤（Ｃ＿（１３）、Ｂ＿（１１ｂ）、Ｂ＿（１０）、Ｂ＿（４ｂ）和Ａ＿３）中精选出镜煤、壳质暗煤、惰性暗煤及构造煤，采用重量法，分别测定它们的甲烷吸附量，从而研究不同成分组成的煤其甲烷吸附性能。  相似文献   

Geology and Genesis of Peraluminous Granites in East Tianshan Upper Paleozoic Island Arc Belt   总被引：6，自引：1，他引：6  

Lianxing Gu  Hao Yang  Zhengfu Yan  Jingjuan Liao  Jinzhu Wang 《中国地球化学学报》1996,15(1):33-43

A peraluminous granite belt occurs along the connecting zone between the Turpan-Hami Precambrian block and the Upper Paleozoic island arc belt. Muscovite granite and twomica granite are the essential lithological components of that belt. All the potassium feldspars in these granites are microcline. Heavy minerals are dominated by magnetite. SiO₂ contents of these granites are greater than 73% with most of the A/NKC values greater than 1.1, normative corundum values greater than 1. Plots of CIPW norms in the (Al-K-Na)-Ca-(Fe²⁺+ Mg) diagram are mostly situated in the plagioclase-cordierite-muscovite region. The rocks are characterized by very low contents of minor elements and ΣREE with strong Eu depletion, δ¹⁸O values between 6.6‰ and 7.0‰, Rb-Sr isochron age of 260.2 ± 6.2 Ma and an initial⁸⁷Sr/⁸⁶ Sr ratio of 0.7052. These granites might have been produced by partial melting of moderately acidic volcanites and low-maturity sediments in the basement sequences and could be genetically connected with the southward A-type subduction of the Turpan-Hami block following the closure of the Middle Carboniferous back-arc basin.  相似文献   

The Confirmation of a New Type of Chondrites and Their Cosmochemical Significance     

侯渭 《中国地球化学学报》1996,15(2):100-104

The data available show that some Antarctic carbonaceous chondrites are similar to Cl meteorites.Tehy contain a lot of phyllosilicate aggregates and the oxygen isotopic composition of the whole-rock samples is approximate to that of C1 chondrites,so they are named after quasi-C1(Q-C1)chondrites Unlike Cl metcorites,the Q-Cl chondites possess chondrule structrue,and the compositions of hih temperature condensates(chondrule fragments,mineral grains or aggregates)show that the oxygen fugacity varied within a wide range in the surroundings where they were formed,similar to the variation range from E.H.L,LL to C group chondrites.It is inferred that the Q-C1 chondrites could be formed at the edges far from the equator in the whole asteroid region of the solar nebular disk.where the nebula was lower in density and the condensates were lower in accretion velocity,so that the hydration of chon drules and matrix occurred during the late stage of nebular condensation.The discovery of the Q-Cl chondrites and the fact that the earth and other terrestrial planets contain water indicate that at the edges far from the equator in the terrestrial reigion of the solar nebular disk,a large amount of water was incorporated into the lattice of minerals in the condensates as a result of hydration during nebular condensation,and then found its way into the interior parts of the Earth and other terrestrial planets due to accretion.  相似文献   

VAMSD矿床系列最基性端员——青德尔尼大型铜钴矿床的地质特征和成因类型   总被引：8，自引：0，他引：8  

王玉往  秦克章 《矿床地质》1997,16(1):1-10

在调查分析德尔尼Ｃｕ－Ｃｏ矿床地质特征的基础上，结合矿床剖面，针对矿区容矿蛇纹岩类进行了系统的岩矿鉴定和地球化学研究，确定矿区广泛发育的各类蛇纹岩基原岩主要为超基性角砾集块岩、凝灰岩等火山岩类。将德尔尼型Ｃｕ－Ｃｏ矿床作为火山岩块状硫化物矿床系列中的最基性端员明确划分出来具有重要意义。  相似文献   

长城式金矿的成因类型初议     

魏富有 《冶金地质动态》1997,(11):5-7

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分散元素钪的矿床类型与研究前景   总被引：4，自引：1，他引：4  

张玉学 《地质地球化学》1997,(4):93-97

由于钪具有特殊的物理－化学性质，它在许多科学领域时虱到广泛的应用。近年来，分散元素钪的成矿问题已经引起了矿床学家的高度重视。本文介绍了我国及世界上主要的伴生钪矿床类型和成矿特征，钪的来源，应用及研究现状，并提出了我国与铝土矿床和磷矿床有关的钪地球化学示踪及研究方法问题。  相似文献   

微区分析在地质研究中的应用          下载免费PDF全文

杨明明 《岩石矿物学杂志》1997,16(4):374-379

微区分析是现代分析技术在地质研究应用中的一个重要领域。通过电子探针对矿物的微区分析，提供了矿床成因理论研究的新依据。本文以金银互化物的研究为例，讨论了在不同在因类型矿床中，金－银构成一个连续的类质同象系列，且变化是有规律可循，其微量元素的含量与该矿床成矿地质环境和相应的地球化学场有关，从而为找矿提供了新的地质信息，拓宽了寻找同类伴生元素矿床或发现新类型矿床的途径。  相似文献