metamorphism [,metə'mɔ:fizm]
- metamorphism的基本解释
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n.
变态, 变形, 变质
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Andalusite-sillimanite type progressive metamorphic belt composed of chlorite-biotite zone, biotite-garnet zone, garnet-staurolite zone, staurolite-andalusite zone and sillimanite zone in Aletai Xinjiang is studied. According to the component zoning of the garnets, the relationship between metamorphism and deformation, and the paragenetic association evolution of the minerals, etc, the metamorphism is divided into three evolution stages: the stage before peak metamorphism, the peak metamorphism stage and the stage after peak metamorphism.
新疆阿勒泰地区发育了红柱石-矽线石型递增变质带,由绿泥石-黑云母带、黑云母-石榴石带、石榴石-十字石带、十字石-红柱石带和矽线石带组成,根据石榴石成分环带、变质与变形关系、矿物共生组合演化等特征,将变质作用分为峰前期、峰期和峰后期3个演化阶段。
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Based on the petrological and geochronological study of metamorphic complexes from the Grove Mountains, the following conclusions are reached.(1)Exsolution texture is widely found in clinopyroxene in mafic granulites. A peak metamorphic temperature of 850 C was obtained from the reintegrated compositions of exsolved clinopyroxene. The preservation of augite megacrysts suggests a single episode of high-grade metamorphism for the Grove Mountains.(2)The compositional comparison of garnet from pegmatites with that from country rocks demonstrates that garnet in pegmatites is of xenocryst origin, and late amphibolite facies metamorphism does not occur in this area.(3)The Pan-African charnockite and post-tectonic sheet-like granite were first recognized in East Antarctica. Their occurrences suggest a collisional orogeny during the Pan-African time.(4)The SHRIMP U-Pb zircon dating on various rock types indicates that the major metamorphism in the Grove Mountains occurs at c. 550 Ma, and the tectonothermal evolution terminated at c. 500 Ma. The Grenvillian granulite facies metamorphism did not develop in the studied area.(5)The Prydz belt, the second Pan-African suture within the Gondwana suppercontinent, was further comfirmed based on this study. The Gondwana suppercontinent was not formed by the simply juxtaposition of East and West Gondwana, but by the collision of several blocks during the Pan-African time.
本项目通过格罗夫山地区高级变质杂岩的变质岩石学和同位素年代学研究,获得如下重要认识:(1)发现辉石出溶结构,由此获得峰期变质温度为850 C,并根据火成普通辉石的识别确定该区只存在单相麻粒岩相变质;(2)通过伟晶岩中石榴石斑晶与围岩中石榴石的对比研究提出了石榴石的捕虏晶成因,进而确定该区不存在晚期角闪岩相变质作用;(3)在东南极首次识别出泛非期紫苏花岗岩和后构造层状花岗岩,为泛非构造热事件的碰撞造山成因提供了重要佐证;(4)对不同岩石类型的锆石SHRIMP定年精确地限定了格罗夫山地区主期变质作用发生于泛非期,~550 Ma,热事件结束于~500 Ma,年代学数据没有揭示在该区存在格林威尔期麻粒岩相变质作用的迹象;(5)进一步确认了东南极内部普里兹带的存在,它属于冈瓦纳超大陆内部的第二条泛非期缝合带,据此认为冈瓦纳超大陆并不是由东、西冈瓦纳陆块的简单拼合而成,而是多个不同块体拼合的结果。
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For giving an explaintion of strong transmogrification but feebleness metamorphism of and their corresponding relation of the Triassic stratum in Songpan-Ganzi area and opening out the temperature and stress condition, this paper summarized study production of predecessors, and put forward 5 conclusions about Songpan-Ganzi area Triassic main lithology(slate, sandrock,and blastopsammitic) through field geological investigation , actual measurement section plane study and combining indoor slice identification , electron probing and fluid enclosure testing analysis:1.Field outcrop strongly transmogrification, and often developed same cleavages(S1) erection or approximately erection 'B'fold and symmetry similituded fold. 2.The metamorphosed mineral combination is simple, and the typical metamorphosed mineral combination is Al+Chl+Ser+Cc+Q, etc. The metamorphosed mineral develops mainly along the cleavages of the territorial cleavages faces(S1), bearing territorial dynamic metamorphism character and belonging to the lawsonite-albite-chlorite face of slightly metamorphism. 3.Territorial metamorphism P-T change focus on T:180~200oC, P:1~2kbar
为了对松潘-甘孜地区三叠系强变形浅变质的特征及变质与变形的对应关系作出解释,揭示变质与变形的温-压条件,本论文总结前人研究成果,通过野外地质调查和实测剖面研究,结合室内薄片鉴定、电子探针和流体包裹体测试分析,对松潘-甘孜地区三叠系主体岩性(板岩、砂板岩、变质砂岩及千枚岩)的变质作用得出5 个认识结论:1、整个松潘-甘孜地区经受了自北向南的强大挤压;2、变质矿物组合简单,除雏晶黑云母外,典型的变质矿物组合为Al+Chl+Ser+Cc+Q等,变质矿物主要沿区域性劈理面(S1)的劈理域发育,具有区域动力变质作用特征,属于低级变质作用中的硬柱石-钠长石-绿泥石相;3、区域变质作用P-T 变化集中在T:180~200oC,P:1~2kbar
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metamorphism:变质作用
变质作用(metamorphism)是指原已存在的各种岩石,由于受构造运动、岩浆作用及地热流变化等内力地质作用的影响,使其所处的地质环境及物理化学条件发生变化,为了适应这种变化,在基本保持固态的情况下,岩石的结构、构造、成分等发生了一系列变化,
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metamorphism:变形
针对恶意代码的变形方法主要有加密技术、多态技术(Polymorphism)和变形(Metamorphism)技术. 如果恶意代码在每次感染的时候使用不同的加密密钥,那么加密的主体在表现形式上就会不一样. 加密的方法比较简单,典型的如固定加密密钥的异或(XOR)加密,
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metamorphism:变质
新获得的结构来自壳聚糖(chitosan)或藻酸盐地壳的热结构强烈影响变形(deformation)、变质(metamorphism)和火成论双色蜡蘑(Laccaria bicolor)生活在树根上,与树根是一种共生关系,其地面之上的发挥作用;麦角二乙酰胺(LSD)等致幻剂也通过这些受体发挥作用.
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metamorphism:作用
化过程形成煤的作用 1.4 煤化作用(coalification) 由泥炭或腐泥逐渐变成各种煤的作用其中包括成岩作用和变质作用 1.5 煤化程度(degree of coalification) 在成煤过程中煤化作用的程度 1.6 变质作用(metamorphism) 褐煤受地热和地压
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pneumatolytic metamorphism:气化变质作用
metropolitan 首都的, 主要都市的, 大城市 | pneumatolytic metamorphism 气化变质作用 | silicon planar transistor 硅平面型晶体管
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