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伟晶岩中文象结构的成因及其找矿意义 被引量:1
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作者 唐勇 《矿物学报》 CAS CSCD 北大核心 2013年第S2期572-572,共1页
文象结构(graphic texture)是指石英呈一定的外形(如尖棱状、象形文字形等)有规律地镶嵌在钾长石中(图1a),这些石英在正交偏光下同时消光。在显微镜下可见的称为显微文象结构;肉眼可见的称为文象结构。通常认为,文象结构是长石和石英在... 文象结构(graphic texture)是指石英呈一定的外形(如尖棱状、象形文字形等)有规律地镶嵌在钾长石中(图1a),这些石英在正交偏光下同时消光。在显微镜下可见的称为显微文象结构;肉眼可见的称为文象结构。通常认为,文象结构是长石和石英在共结点同时结晶形成的。但基于实验研究的结果,Fenn(1986)提出了文象结构形成的另外一种观点。 展开更多
关键词 文象结构 找矿意义 TEXTURE 棱状 钾长石 阿尔泰地区 消光 扩散速率 熔体粘度 佳木
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铜绿山Fe-Cu(Au)矽卡岩矿床花岗伟晶岩及其文象结构的成因:来自钾长石^(40)Ar/^(39)Ar年龄、微量元素和石英中流体包裹体的证据 被引量:3
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作者 邓晓东 李建威 +2 位作者 张伟 Vasconcelos Paulo 赵新福 《地球科学(中国地质大学学报)》 EI CAS CSCD 北大核心 2012年第1期77-92,共16页
铜绿山Fe-Cu(Au)矿床是长江中下游铁铜成矿带最重要的矽卡岩型矿床之一,矿床的形成与铜绿山石英闪长岩岩株有关.矿区东南部发育有花岗伟晶岩,其形成时间介于石英闪长岩和矽卡岩之间.花岗伟晶岩主要由钾长石、斜长石和石英组成;由石英和... 铜绿山Fe-Cu(Au)矿床是长江中下游铁铜成矿带最重要的矽卡岩型矿床之一,矿床的形成与铜绿山石英闪长岩岩株有关.矿区东南部发育有花岗伟晶岩,其形成时间介于石英闪长岩和矽卡岩之间.花岗伟晶岩主要由钾长石、斜长石和石英组成;由石英和钾长石组成的文象结构非常发育.激光阶段加热40Ar/39Ar定年表明,花岗伟晶岩的侵位时间为136.5±0.7Ma(2σ),与石英闪长岩的侵位时代和铜绿山矿床的成矿时代完全一致.铜绿山石英闪长岩与花岗伟晶岩的钾长石具有非常相似的主量元素,平均组成分别为Or81Ab18和Or78Ab21.根据岩相学观察和地球化学分析认为,花岗伟晶岩中的文象结构是在快速冷却体系条件下、钾长石晶体生长边界层的SiO2和Al2O3浓度因生长不平衡发生周期性变化而导致石英和钾长石交替生长形成的.铜绿山石英闪长岩和花岗伟晶岩中钾长石的大离子亲石元素(LILE)含量均较高,但与前者相比,花岗伟晶岩中钾长石的Rb、Pb含量明显增加,Ba、Sr含量显著降低,Li、Cs含量略微降低.大离子亲石元素图解(Rb-Ba、La-Ba、K/Ba-Ba、Rb/Sr-Ba)指示花岗伟晶岩是铜绿山石英闪长岩岩浆晚期高度结晶分异演化的结果.但花岗伟晶岩钾长石中Pb、Li、Ga等元素的变化却与岩浆结晶分异演化趋势相悖,表明流体作用在花岗伟晶岩的形成过程中扮演了重要角色.花岗伟晶岩中的石英发育大量熔融包裹体和高盐度流体包裹体,后者的均一温度为260~435℃,进一步证实花岗伟晶岩是从流体-熔体共存体系中结晶的. 展开更多
关键词 花岗伟晶岩 文象结构 40Ar/39Ar定年 铜绿山 微量元素 包裹体 结晶分异 矿床学
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文象花岗岩的成分、结构和成因机制 被引量:3
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作者 徐海军 张超 +1 位作者 武云 陶明 《地球科学(中国地质大学学报)》 EI CSCD 北大核心 2016年第9期1511-1525,共15页
文象花岗岩具有特殊文象结构,研究其三维拓扑结构和形成过程有助于了解花岗质岩石的结晶作用.以北京周口店房山岩体和湖北罗田蕙兰山的文象花岗岩为研究对象,综合利用光学显微镜、扫描电镜、电子探针和电子背散射衍射等技术方法,对... 文象花岗岩具有特殊文象结构,研究其三维拓扑结构和形成过程有助于了解花岗质岩石的结晶作用.以北京周口店房山岩体和湖北罗田蕙兰山的文象花岗岩为研究对象,综合利用光学显微镜、扫描电镜、电子探针和电子背散射衍射等技术方法,对岩石矿物组成、结晶学取向和拓扑结构进行了系统研究.结果表明:(1)文象花岗岩的矿物组成与其形成地质环境有关,石英和长石的含量变化范围很大,其中石英含量通常在20%~45%,但是相同地区同期形成的文象花岗岩具有相对稳定的矿物组成;(2)长石作为寄主矿物通常呈半自形一自形粗大晶体,可以是碱性长石或斜长石,其端元组分以钾长石和钠长石为主,低温下常分解为条纹长石;(3)石英在长石寄主矿物中规则穿插生长,在三维空间通常呈近似平行板状、长条状/柱状或非连通枝权状,并只在特定岩石断面形似象形文字;(4)正交偏光显微镜下,石英可以具有多种消光位,但是通常在一定范围内同时消光;(5)石英普遍发育道芬双晶,偶见日本双晶;(6)条纹长石中钾长石与钠长石对应(100)、(010)、(001)面和[001]轴近似平行;(7)多数石英颗粒与寄主长石之间具有密切结晶学取向关系,即石英[1123]轴近似平行长石c[001]轴.该研究证实文象花岗岩是石英和长石同时生长的结果,而长石作为寄主矿物影响并控制着石英的成核与生长方向. 展开更多
关键词 文象花岗岩 文象结构 电子背散射衍射 道芬双晶 拓扑结构 晶体光学 矿物学.
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桂东南岑溪地区伟晶岩脉新发现及找矿意义 被引量:1
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作者 郭尚宇 刘炳胜 《南方国土资源》 2020年第5期42-45,共4页
文章对桂东南岑溪地区三堡镇—波塘镇伟晶岩脉地质背景、宏观特征和微观特征进行简要阐述,并对其成因进行探讨。
关键词 桂东南文象结构 伟晶岩 稀有金属 岑溪
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Observe Chinese Culture from Chinese Idioms
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作者 Linying He Junhong Ma Yanmin Wang 《International English Education Research》 2015年第11期42-44,共3页
Chinese idioms are the essence of the Chinese language, the crystallization of human wisdom and the important cartier of national culture. Through the structure, content and meaning of Chinese idioms, we can see vario... Chinese idioms are the essence of the Chinese language, the crystallization of human wisdom and the important cartier of national culture. Through the structure, content and meaning of Chinese idioms, we can see various forms of the history and culture of the Han nationality. Observe national culture through the structure, content, meaning of Chinese idioms, namely the phenomenon of the linguistic phenomenon and culture phenomenon, we focus on elaborating Chinese idioms and cultural relationship between a Chinese idiom and Chinese culture. 展开更多
关键词 Chinese Idioms National Traditional Culture Idiom Structure Idioms Content Material Culture Spiritual Culture
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George Orwell's Experiment With the Ironic Narrative Structure in Nineteen Eighty-Four
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作者 Louai T. ABU Lebdeh Amaal A1 Masri 《Journal of Literature and Art Studies》 2014年第10期784-791,共8页
This study seeks to establish the major relevance of the ironic vision embodied in the narrative structure in George Orwell's early novel Nineteen Eighty-Four. After providing a comprehensive satisfying examination o... This study seeks to establish the major relevance of the ironic vision embodied in the narrative structure in George Orwell's early novel Nineteen Eighty-Four. After providing a comprehensive satisfying examination of the cultural phenomenon that goes by the name of "Modernism", the world in which the young George Orwell began his literary career; the study will present a critical analyses exploring Orwell's novel concerning the past-war ironic dystopian vision, with special reference to his experiment with the ironic narrative techniques and structure. 展开更多
关键词 MODERNISM ironic narrative Winston Smith romantic quest POLITICS doublethink Big Brother
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Creating customized data services from web pages
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作者 季光 Wang Guiling Han Yanbo 《High Technology Letters》 EI CAS 2013年第2期203-207,共5页
To extract structured data from a web page with customized requirements,a user labels some DOM elements on the page with attribute names.The common features of the labeled elements are utilized to guide the user throu... To extract structured data from a web page with customized requirements,a user labels some DOM elements on the page with attribute names.The common features of the labeled elements are utilized to guide the user through the labeling process to minimize user efforts,and are also utilized to retrieve attribute values.To turn the attribute values into a structured result,the attribute pattern needs to be induced.For this purpose,a space-optimized suffix tree called attribute tree is built to transform the document object model(DOM) tree into a simpler form while preserving its useful properties such as attribute sequence order.The pattern is induced bottom-up on the attribute tree,and is further used to build the structured result.Experiments are conducted and show high performance of our approach in terms of precision,recall and structural correctness. 展开更多
关键词 web data extraction structured data user labeling CUSTOMIZATION data service
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Culture Through Prism of Engaged Poetry
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作者 Tina Laco 《Sino-US English Teaching》 2015年第3期234-239,共6页
The paper is actually a literary research on (re)constructing cultural image of post-yugoslavian society, formed through literary sources, i.e., poetry. Using examples of award-winning young authors--Bojan Krivokapi... The paper is actually a literary research on (re)constructing cultural image of post-yugoslavian society, formed through literary sources, i.e., poetry. Using examples of award-winning young authors--Bojan Krivokapic, Mirko Bozic, and Sima Majic, different types of so-called engaged poetry are indicated. This kind of poetry is used to subtly, critically, or in a very subversive way relate to the existing world, but also a new postmodern identity is formed through specific and carefully chosen poetic lexis, deprived of any kind of structure or limitation. The poetry of mentioned authors is used as a provisory example in order to indicate that post-war period (as well as postmodern time) changes the perception of identity, from nationally and politically oriented structure to individual and subversive, conventions-free comprehension of Oneself. Although the three authors are very different in style and expression, what brings them together is tendency to escape conventional and traditional cultural images in order to emphasize the importance of Being Different, but Equally Rightful. 展开更多
关键词 CULTURE engaged poetry LANGUAGE POSTMODERNISM IDENTITY
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