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青海东昆仑卡尔却卡地区野拉塞铜矿床成因类型及成矿机制 被引量:19
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作者 李碧乐 孙丰月 +4 位作者 于晓飞吉林大学地球科学学院 丁清峰 钱烨 张晗 许庆林 《岩石学报》 SCIE EI CAS CSCD 北大核心 2010年第12期3696-3708,共13页
青海野拉塞铜矿位于东昆仑造山带西段,是近年来祁曼塔格地区新发现的热液铜矿床,规模已达中型。矿床的容矿围岩主要是印支早期中酸性侵入岩,其次是志留纪滩间山群大理岩和基性火山岩。矿化主要受NWW向断裂构造控制,主要蚀变为硅化、绢... 青海野拉塞铜矿位于东昆仑造山带西段,是近年来祁曼塔格地区新发现的热液铜矿床,规模已达中型。矿床的容矿围岩主要是印支早期中酸性侵入岩,其次是志留纪滩间山群大理岩和基性火山岩。矿化主要受NWW向断裂构造控制,主要蚀变为硅化、绢云母化和钾长石化。根据脉体穿切关系和矿物交代关系,成矿过程划分为主要的Ⅰ、Ⅱ和Ⅲ个阶段。研究表明,野拉塞铜矿床石英中发育气液两相(W型)、含子矿物三相(S型)和富CO2三相(C型)3种类型包裹体。流体盐度为3.42%~65.48%NaC leqv,集中在40.00%~55.00%NaC leqv和4.00%~10.00%NaC leqv两个区间;流体盐度、密度在直方图上主要表现为双峰特征。流体密度为0.43~1.25g.cm-3,集中在1.07~1.14g.cm-3和0.55~0.85g.cm-3两个区间。成矿温度为187~579℃,成矿Ⅰ、Ⅱ和Ⅲ阶段成矿温度分别为332~579℃、294~345℃和187~212℃。成矿Ⅰ阶段C型与S型包裹体共存,表明该阶段发生过沸腾或不混溶。可能的流体演化机制是,岩浆结晶的最后阶段从岩浆中直接出溶的极高温、中高盐度(约为15%~25%NaCleqv)的原始成矿流体(岩浆流体),通过不混溶作用形成高温高盐度S型、高温低盐度C型和高温低盐度W型流体,该过程导致成矿物质的第1次沉淀富集。成矿Ⅱ阶段流体的混合作用则是铜沉淀的主要原因。通过等容线图解法估算成矿压力为47.4~93.1MPa,成矿深度为1.8~3.5km。与成矿关系密切的酸性侵入岩类为高钾、铝过饱和的钙碱性系列岩石。岩石的稀土总量TREE为133.9×10-6~240.6×10-6,介于上、下地壳平均值之间,岩石轻稀土分馏明显,重稀土分馏不明显,δEu为负异常。岩石具明显的K、Rb、Th等正异常,亏损重稀土,显示Nb、Ta负异常,尤其亏损P、Ti,与碰撞带岩浆岩地球化学特征类似。在Rb-Y+Nb和Nb-Y构造环境判别图解上,样品均落在同碰撞花岗岩区,成矿作用发生在早印支后期陆内强烈的造山时期。矿床成因类型为受线性断裂构造控制的似斑岩型矿床。 展开更多
关键词 流体包裹体 同碰撞环境 似斑岩型铜矿 野拉塞 东昆仑
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Examples of National and Transnational Cinema: Akira Kurosawa's Yojimbo and Sergio Leone's A Fistful of Dollars
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作者 Flavia Brizio-Skov 《Cultural and Religious Studies》 2016年第3期141-160,共20页
The term transnational originated in the historical field when, in the late 1990s, lan Tyrrell wrote a seminal essay entitled "What is Transnational History?" and changed the course of the academic discipline, clai... The term transnational originated in the historical field when, in the late 1990s, lan Tyrrell wrote a seminal essay entitled "What is Transnational History?" and changed the course of the academic discipline, claiming that studying the history of a nation from inside its borders was outmoded because the study of history concerns the movements of peoples, ideas, technologies, and institutions across national boundaries. The study of cross-national influences and the focus on the relationship between nation and factors beyond the nation spilled over into many other fields, especially into cinematic studies. Today transnational refers to the impossibility of assigning a fixed national identity to much cinema, to the dissolution of any stable connection between film's place of production and the nationality of its makers and performers. Because there is a lot of critical debate about what constitutes national and transnational cinema, the study of international remakes is a promising method to map the field with some accuracy. This essay will analyze the journey from Hammett's novel to Kurosawa's film and then to Leone's western, and will demonstrate how the process of adaptation functions and what happens to a "text" when it becomes tmnsnational and polysemic. Because Leone is the creator of the Italian western, the one who initiated the cycle that was copied many times over for a decade, we must look at A Fistful of Dollars as a prototype, a movie that when dissected can shed light on the national-transnational dichotomy of the spaghetti western. However, before studying the prototype, we must look at the complex history of the origin of the first spaghetti western, taking into account that A Fistful of Dollars was "transcoded" by Leone from Kurosawa's Yojimbo (1961) that derived his script from Dashiell Hammett's RedHarvest (1929). 展开更多
关键词 national and transnational cinema adaptation from literature to screen international remakes transculturization PERMUTATION reappropriation REINTERPRETATION
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