石英质

Rhyolites are a group of extrusive igneous rocks with phenocrysts (visible crystals that grew out of the molten lava) of quartz and alkali feldspar in a glassy to cryptocrystalline groundmass.

流纹岩是一组受挤压火成岩矿，包含了在玻璃基的隐晶质中的石英与碱性长石的斑晶（生在于熔岩外的可见石英晶体）。

Ion microprobe U-Pb dating of zircons from the tonalitic gneiss and quartz dioritic orthogneiss yielded statistically distinguishable 206Pb/238U crystallization ages of 58.5±0.7 Ma and 63.5±0.8 Ma, respectively.

对2颗片麻岩中的锆石进行了离子探针U-Pb测年，测得英云闪长质和石英闪长质片麻岩中的锆石206Pb/238U结晶年龄分别为58.5Ma±0.7Ma和63.5Ma±0.8Ma。

Volcanic rocks are of the high-K calc-alkaline series rock association, composed mainly of ryholitic and trachytic dacitic rocks, and the central intrusive body is olivine-andesite-trachytic quartz syenitic porphyrite.

火山岩为以流纹质和粗面英安质为主的高钾钙碱性系列岩石组合，中央侵入体为橄榄安粗岩系列石英正长斑岩，它们的A/CNK值集中在0.9～1.2之间，为铝饱和或铝过饱和类型。

This thesis studies the volcanic tectono-petrofacies, petrology, mineralogy, geochemistry, isotopic chronology, stratum and high-precision SHRIMP zircon U-Pb datings of the Mt.Yandangshan volcano-intrusive complex, and concludes that: Yandangshan volcanic rock units belong to high-K calc-alkaline acid rock associations, mainly ryholitic and trachytic dacitic in composition. They have A/CNK values of 0.9-1.2 (i.e., aluminium saturation and supersaturation), enriched LREE and LILEs and depleted HFSE. Their 8Eu values are 0.11-0.32, indicating a evident fractional evolution of plagioclase crystallization. Their ∑REE varied very limitedly,(87~Sr/(86)Sri ratios and eNd values are 0.7086～0.7095 and -10.20～-9.96 for volcanic rocks, and 0.7087~0.7095 and -7.6～6.92 for the central intrusive facies syenite, which means that all the igneous rocks from Mt. Yandangshan are evolutional products of magmas with the same source, and that they derived mainly from crust, but mixed with mantle components.

本文从火山构造岩相学、岩石学、矿物学、地球化学、同位素年代学、地层学等方面出发，同时结合高精度SHRIMP锆石U-Pb定年，对雁荡山火山岩进行了系统的研究，确定雁荡山火山岩为一套以流纹质和粗面英安质为主体的高钾钙碱性酸性岩石组合，A/CNK值集中在0.9～1.2之间，为铝饱和或铝过饱和类型；富轻稀土元素和大阳离子亲石元素、相对亏损高场强元素：负铕异常明显，δEu值为0.11～0.32，表明岩浆经历了以斜长石为主的强烈结晶分异作用：岩石样品的∑REE变化有限，火山岩样品的~(87Sr/~(86)Sr_i为0.7086～0.7095，εNd为-10.20～-9.96，中央侵入体石英正长岩~(87Sr/~(86)Sr_i为0.7087～0.7095，εNd为-7.6～-6.92，表明它们是同源岩浆分异演化的产物，物质来源主要为陆壳，但有地幔物质参与。

Zircons from tonalitic and quartz dioritic orthogneisses in the Nyainqêntanglha Mountains, Tibet, were dated by ion microprobe and their origin was studied.

采用高精度离子探针测年方法对西藏念青唐古拉山英云闪长质和石英闪长质正片麻岩中锆石的成因和形成时代进行了研究。

Secondly, the influences of pH value of buffer solutions on the dedolomitization of dolostone powders and the expansion of a reactive dolomitic limestone were investigated. A program was conducted to study the reaction and expansion of dolostone powders in compacts and pastes of cement, and that of dolomitic rocks with few clay and quartz in alkaline solutions and concrete.

第二部分研究了溶液pH值对白云岩粉料的去白云化反应速率及活性白云质灰岩膨胀速率的影响；分析了白云岩粉料在水泥压实体中、含很少粘土和石英的白云质岩石在碱溶液及混凝土中所发生的化学反应，并测定了伴随化学反应产生的膨胀。

Under optical microscope,the observational result indicates that the peach blossom stone samples from Gao Mountain contains transparent and distransparent minerals which forms pealike and red spots.

光学显微镜的观察结果表明，高山桃花石样品中存在透明和不透明矿物，其中不透明矿物形成了艳丽的红色斑点；XRD测试表明，样品的矿物组成为地开石、赤铁矿、石英以及少量的叶腊石；拉曼光谱测试结果表明，样品的基质部分为地开石，结晶形态完好的红色矿物颗粒与呈浸染状的红色部分均为赤铁矿，无色透明的矿物颗粒为石英。

Under optical microscope, the observational result indicates that the peach blossom stone samples from Gao Mountain contains transparent and distransparent minerals which forms pealike and red spots. The XRD testing result indicates that the mineral compositions in the samples are dickite, hematite, quartz and a little pyrophyllite. LRM testing result shows that the basic part of the samples is dickite, the red minerals with both well crystal shape and dip dye shape are hematite, and colourless and transparent mineral grains are quartz.

光学显微镜的观察结果表明，高山桃花石样品中存在透明和不透明矿物，其中不透明矿物形成了艳丽的红色斑点；XRD测试表明，样品的矿物组成为地开石、赤铁矿、石英以及少量的叶腊石；拉曼光谱测试结果表明，样品的基质部分为地开石，结晶形态完好的红色矿物颗粒与呈浸染状的红色部分均为赤铁矿，无色透明的矿物颗粒为石英。

Veined,stockwork and alteration-sheathed gold ores have been found in the area,belonging to four genetic types:the volcanic hydrothermal ores related to early—middle Carboniferous volcanism; subvolcanic hydrothermal ores related to intermediate—acidic porphyry intrusions; hydrothermal ores to the granitic intrusion and dynamo- hydrothermal ores related to regional dynamic metamorphism along the faults.

矿石类型有含金石英大脉型、石英网脉型和蚀变岩型。矿床成因类型有4种：一为火山热液型，其成因与区内早—中石炭世火山作用有关；二为潜火山热液型，与中酸性斑岩体侵位有关；三为岩浆热液型，与花岗质岩浆的侵位有关；四为动力变质热液型，沿断裂带分布于蚀变玄武岩中，系区域动力变质作用的产物。

In this paper,the basic features of quartz and the theoretic basis for quartz to be taken as a tracer for material source are summarized,and the material source tracing methods to use scanning electron microscope,mass spectrometer,electron spin resonance and cathode luminescence and the feasibility of these methods are introduced in detail.

综述了石英的性质和它作为有效指示剂来示踪物源的理论基础，进而详细介绍了使用扫描电镜、质谱、电子自旋共振和阴极发光等仪器对石英矿物的表面微结构、氧同位素比值、形成年龄和阴极发光颜色等特征进行研究来追踪物源的方法以及这些方法的可行性。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

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如果有任何问题，你可以随时联系我。