年代学

This provides an evidence for discrimination and epoch of syn-orogenic granitoid, and also serves as a new chronological restriction for the subduction-orogeny of Altay orogen in Eopaleozoic (Ordovician-Devonian).

这为阿尔泰造山带的同造山花岗岩的鉴别和时代确定提供一个证据，也为阿尔泰造山带在早古生代的俯冲造山提供了一个新的年代学制约。

Granitoid rocks ; Chronology ; Petrology ; Geochemistry ; Tectonic environment ; Southern Tianshan.

花岗岩类岩石；年代学；岩石学；地球化学；构造环境；南天山

Also, there is no formula can be used to calculate errors of these parameters.Based on above reasons, the purposes of the research are to build a reliable geochronological framework of Paleozoic granitoid in study area, to distinguish their genetic types and tectonic settings, and to analyses their orogenic response; to derive a set of formulas for calculating errors of the paramers mentioned above; to ascertain if North Qaidam belongs to North China Block or Yangtze Block.

基于上述存在的问题，本项研究的目的是：建立研究区古生代花岗岩类精确的年代学格架，判别其成因类型和构造环境，分析其造山响应：推演出一套适用于Sr、Nd同位素初始比值和Nd同位素模式年龄等重要示踪参数误差计算的公式；确定柴北缘地区大地构造属性(华北板块还是扬子板块？)。

The studies on the compositions, origins and elastic properties of the southern Tibetan lower crust include the following 4 aspects: the petrological and geochemical festures and ages of granulitic facie rocks located in Higher Himalayas; dehydration melting experiments on the biotite-plagioclase gniess collected from Higher Himalayas at high temperature and high pressure to model the formation of the granulites; measurements of wave velocities of the lower crustal rock in situ; analysis of origin of intracrust low wave velocity layers beneath southern Tibet.

以西藏南部下地壳物质组成，成因及其弹性性质为研究目标进行了4个方面的相关研究：高喜马拉雅地区麻粒岩相岩石的岩石学，地球化学和年代学研究；麻粒岩相岩石成因的高温高压实验；原位条件下岩石的弹性波速测量；西藏高原壳内低速层的成因分析与模拟。

Gyirong-Oma basin of Xizang ; Paleomagnetic chronology ; Hipparion fauna ; Himalayan uplift.

西藏吉隆—沃马盆地；古地磁年代学；三趾马动物群；喜马拉雅山抬升

Then; we compare the calibrated fossil shell results with the datings of the soil humin fraction and concentrated pollen in order to evaluate the reliability of the dating terrestrial mollusks fossil shells.

运用现生蜗牛壳体的AMS14C测定来校正化石蜗牛的年龄，结合剖面中孢粉浓缩物、土壤有机质的AMS14C年代学对比研究，发现蜗牛化石壳体的文石可以提供较可靠的年代数据，为14C测年的可靠性研究提供了一种可能的途径。

The genesis and evolution of spilite-quartz keratophyre formation are discussed through studies on Sm-Nd, Rb-Sr, K-Ar isotopic characteristics of the volcanic rocks and its geological setting, and comprehensive studies of petrology, lithochemistry, trace element, REE characteristics of the volcanic rocks.

从Sm-Nd、Rb-Sr、K-Ar同位素年代学和区域地质背景以及岩石学、岩石化学、微量元素、稀土元素等方面探讨了细碧岩-石英角斑岩建造的成因及演化。

Geological conditions of gold mineralization and ore-prospecting prognosis in Yuejiazhuang-Hutouya tectonic complex rock zone;2. Structure—magma control of gold mineralization in northwest sichuan;3. The result is that not only both of them were formed in the same tectonic setting,but also lamprophyre had an important mineral matter contribution to gold mineralization and are the marks for predicting gold deposits.

在详细的矿床地质、岩石地球化学和同位素年代学综合研究基础上，结合区域构造演化的特点，着重对金矿与煌斑岩的成因关系进行了剖析，认为戈枕含金剪切带煌斑岩与金矿不仅具有生成构造环境上的联系，而且对金成矿具有重要的物源贡献，是金矿找矿标志。

D dissertation mainly studied some Yanshanian mafic dikes, volcanic rocks and alkalic-ultramafic dikes in Shandong Province.

但关于它们的年代学和系统的地球化学研究还比较薄弱，且对其成因和形成的构造环境，仍存在着争议。

Methods Based on the analysis for the inner structural CL images of zircons, the U-Pb ages and Hf isotopes of zircons from the host granites, mafic microgranular enclaves and diorite dykes have been discussed using in situ zircon analysis of the LA-ICPMS and MC-ICPMS.

在锆石内部结构的CL图像研究基础上，用LA-ICPMS和MC-ICPMS测定锆石U-Pb年龄及Hf同位素组成，探讨寄主花岗岩、暗色闪长质包体及及围岩中闪长质脉体锆石U-Pb年代学及Hf同位素组成特征。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。