美女裸体无遮挡掩免费视频

<acronym id="whffm"></acronym>
<td id="whffm"><ruby id="whffm"></ruby></td>
  • <acronym id="whffm"><label id="whffm"></label></acronym>
    <p id="whffm"></p>
    <acronym id="whffm"><label id="whffm"></label></acronym>

    <track id="whffm"><strike id="whffm"></strike></track>

    1. 服務項目

      U-Pb定年
      發布時間: 2021-03-09 13:01:43來源:上譜分析瀏覽次數: 2093
      測試項目:U-Pb定年

      測試對象:鋯石、榍石、錫石、獨居石、瀝青鈾礦、晶質鈾礦等副礦物

      測試周期:需預約,5-10個工作日可完成測試??商峁y試加急服務。

      送樣要求:1、單礦物需制靶、照透反射、CL照相;2、薄片、探針片、光片長度不超過5cm,寬不超過3cm,厚度不超過0.8cm;3、客戶可靈活選擇自行測試或者委托測試。

      完成標準:儀器狀態良好,監控標樣測試年齡值在國際推薦值誤差范圍內。

      方法描述:
      ××代表實驗中激光束斑和頻率的數值,根據具體實驗條件填寫。鋯石常規分析條件為32 µm和5 Hz

      1.1鋯石LA-ICP-MS微區原位U-Pb定年和微量元素分析

      鋯石U-Pb同位素定年和微量元素含量在武漢上譜分析科技有限責任公司利用LA-ICP-MS同時分析完成。詳細的儀器參數和分析流程見Zong et al. (2017)。GeolasPro激光剝蝕系統由COMPexPro 102 ArF 193 nm準分子激光器和MicroLas光學系統組成,ICP-MS型號為Agilent 7700e。激光剝蝕過程中采用氦氣作載氣、氬氣為補償氣以調節靈敏度,二者在進入ICP之前通過一個T型接頭混合,激光剝蝕系統配置有信號平滑裝置(Hu et al., 2015)。本次分析的激光束斑和頻率分別為××µm和××Hz。U-Pb同位素定年和微量元素含量處理中采用鋯石標準91500和玻璃標準物質NIST610作外標分別進行同位素和微量元素分餾校正。每個時間分辨分析數據包括大約20-30 s空白信號和50 s樣品信號。對分析數據的離線處理(包括對樣品和空白信號的選擇、儀器靈敏度漂移校正、元素含量及U-Pb同位素比值和年齡計算)采用軟件ICPMSDataCal (Liu et al., 2008; Liu et al., 2010)完成。鋯石樣品的U-Pb年齡諧和圖繪制和年齡加權平均計算采用Isoplot/Ex_ver3 (Ludwig, 2003) 完成。
      (巖石薄片中鋯石U-Pb同位素定年參考Zong et al. (2010))。

      1.2 In-situ U-Pb dating and trace element analysis of zircon by LA-ICP-MS

      U-Pb dating and trace element analysis of zircon were simultaneously conducted by LA-ICP-MS at the Wuhan SampleSolution Analytical Technology Co., Ltd., Wuhan, China. Detailed operating conditions for the laser ablation system and the ICP-MS instrument and data reduction are the same as description by Zong et al. (2017). Laser sampling was performed using a GeolasPro laser ablation system that consists of a COMPexPro 102 ArF excimer laser (wavelength of 193 nm and maximum energy of 200 mJ) and a MicroLas optical system. An Agilent 7700e ICP-MS instrument was used to acquire ion-signal intensities. Helium was applied as a carrier gas. Argon was used as the make-up gas and mixed with the carrier gas via a T-connector before entering the ICP. A “wire” signal smoothing device is included in this laser ablation system (Hu et al., 2015). The spot size and frequency of the laser were set to ××µm and ××Hz, respectively, in this study. Zircon 91500 and glass NIST610 were used as external standards for U-Pb dating and trace element calibration, respectively. Each analysis incorporated a background acquisition of approximately 20-30 s followed by 50 s of data acquisition from the sample. An Excel-based software ICPMSDataCal was used to perform off-line selection and integration of background and analyzed signals, time-drift correction and quantitative calibration for trace element analysis and U-Pb dating (Liu et al., 2008; Liu et al., 2010). Concordia diagrams and weighted mean calculations were made using Isoplot/Ex_ver3 (Ludwig, 2003).
      (The real in-situ U-Pb dating of zircon in thin-section can cite reference of Zong et al. (2010)).
      References
      Zong, K.Q., Klemd, R., Yuan, Y., He, Z.Y., Guo, J.L., Shi, X.L., Liu, Y.S., Hu, Z.C., Zhang, Z.M., 2017. The assembly of Rodinia: The correlation of early Neoproterozoic (ca. 900 Ma) high-grade metamorphism and continental arc formation in the southern Beishan Orogen, southern Central Asian Orogenic Belt (CAOB). Precambrian Research, 290, 32–48.
      Hu, Z.C., Zhang, W., Liu, Y.S., Gao, S., Li, M., Zong, K.Q., Chen, H.H., Hu, S.H., 2015. “Wave” signal-smoothing and mercury-removing device for laser ablation quadrupole and multiple collector ICPMS analysis: application to lead isotope analysis. Analytical Chemistry, 87(2), 1152–1157.
      Liu, Y.S., Hu, Z.C., Gao, S., Günther, D., Xu, J., Gao, C.G. and Chen, H.H., 2008. In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard. Chemical Geology, 257(1-2): 34-43.
      Liu, Y.S., Gao, S., Hu, Z.C., Gao, C.G., Zong, K.Q. and Wang, D.B., 2010. Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen: U-Pb dating, Hf isotopes and trace elements in zircons of mantle xenoliths. Journal of Petrology, 51(1–2): 537–571.
      Ludwig, K.R., 2003. ISOPLOT 3.00: A Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Center, California, Berkeley, 39 pp.
      Zong, K.Q., Liu, Y.S., Gao, C.G., Hu, Z.C., Gao, S., Gong, H.J., 2010. In situ U-Pb dating and trace element analysis of zircons in thin sections of eclogite: Refining constraints on the ultra-high pressure metamorphism of the Sulu terrane, China. Chem. Geol. 269: 237-251.

      分享到:
      Copyright By ? 2008~2021 武漢上譜分析科技有限責任公司 版權所有 鄂ICP備13005848號-1 鄂公網安備42018502001278號
      美女裸体无遮挡掩免费视频