年代学

This paper takes field surveys to the Yinmawanshan batholith in detail, and takes precise isotopic dating and the geochemical analyses.

本文对饮马湾山岩体进行了详细的野外地质调查，并开展了高精度的同位素年代学测定与地球化学分析。

Basing on detailed field survey and laboratory researches on lithological features, mineralogical composition, geochemical and zircon SHRIMP U-Pb data, together with the mineralogical study of chromitite and mantle peridotite heavy mineral bulk sample, various proceedings and recognitions have been achieved:(1) The mantle peridotite is the remnants of partial melted MOR mantle altered by SSZ fluids.

通过详细的野外调查和室内岩石薄片的岩相学、矿物成分、岩石地球化学和锆石SHRIMP U-Pb同位素年代学，铬铁矿和地幔橄榄岩的人工重砂大样的矿物学研究，取得以下进展和认识：(1)认为康金拉地幔橄榄岩为部分熔融MOR地幔残余，叠加了SSZ流体的改造。

SIMS Center is also to perform high accuracy micro-area chronologic study.

离子探针中心同样可以开展微区高精度年代学研究。

On the basis of the results of analyses of charcoal debris, spores and pollen, and chronologic datings in a natural profile, the climatic changes during the last 2500 a are reconstructed.

根据一天然剖面的炭屑、孢粉、年代学分析结果，研究了2500 a以来的气候变化过程。

This age stands for the formation time of the ocean basin of Xiugugabu-Daba Tethys, and is very close to that of the middle part of the Yarlung-Zangbo suture zone (126±1.5 Ma). This outcome provides a well chronologic condition for discussing the palaeotectonic framework and the evolution of the Tethys basin in the study area. In addition, the forma...

该年龄代表了休古嘎布-达巴特提斯洋盆的形成时代，与雅鲁藏布江缝合带中段洋盆形成时代(126±1.5Ma)相当，此结果对于确定研究区特提斯洋盆的古构造格局及其发育演化过程等提供了重要的年代学制约。

Chronologic researches on the Mesozoic (230-65Ma) volcanic rocks in West Liaoning and adjacent areas indicate that the volcanic activities were periodic with an average period of 20-30Ma, and that the peak ages of the volcanic activities were determined at 230Ma, 190Ma, 160Ma, 130-120 Ma, 110-100 Ma, and 80Ma, respectively.

对辽西及其邻区中生代(230~65Ma)火山岩年代学的研究发现：火山活动具有平均间隔20~30Ma的周期性，火山岩活动的峰期为230Ma、190Ma、160Ma、130~120Ma、110~100Ma、80Ma。

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。

In the past 20 years, detrital thermochronology has been widely applied to geological researches with the advance of the analytical technology.

最近20年来，随着测试技术的发展，碎屑颗粒热年代学方法被广泛应用到地质学研究中。

These similar results suggest the detrital thermochronoglogy is a successful method for obtaining information of tectonic ac-tivities.

这表明碎屑颗粒热年代学可以成功揭示构造活动的信息。

Can the detrital thermochronolgoy be applied to geological studies successfully?

碎屑颗粒热年代学是否可以成功地应用于地质学研究呢？

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了