Skip navigation

DSpace

機構典藏 DSpace 系統致力於保存各式數位資料(如:文字、圖片、PDF)並使其易於取用。

點此認識 DSpace
DSpace logo
English
中文
  • 瀏覽論文
    • 校院系所
    • 出版年
    • 作者
    • 標題
    • 關鍵字
  • 搜尋 TDR
  • 授權 Q&A
    • 我的頁面
    • 接受 E-mail 通知
    • 編輯個人資料
  1. NTU Theses and Dissertations Repository
  2. 理學院
  3. 地質科學系
請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/2724
標題: "Geological and Geochemical Analyses for Emerald Exploration in the Muzo Formation along the Western Emerald belt, Colombia"
Geological and Geochemical Analyses for Emerald Exploration in the Muzo Formation along the Western Emerald belt, Colombia
作者: Gabriel Felipe Nino Vasquez
凡凱培
指導教授: 宋聖榮
關鍵字: WEB,hydrothermal-sedimentary deposits,emerald,Muzo Formation,isotopic fractionation,subduction,
出版年 : 2017
學位: 碩士
摘要: The Colombian emeralds are distributed in two parallel belts where the host rocks are mainly Cretaceous black shales and limestones. A better understanding of the mineralizing processes which form the emerald deposits in Colombia will improve the exploration activities within both belts.
This study focuses on the Western Emerald Belt (WEB) where seven mines were visited. The WEB is located in the central part of Colombia, on the western flank of the Eastern Cordillera. The most important emerald mines are located in Muzo, Maripi, Yacopi, Otanche and Coscuez municipalities.
Thirty six samples were collected for analyses of carbon and oxygen isotopes with the purposes of: first, to know the main source of the fluid(s) which interacted with the shales in order to form the emeralds and associated minerals (pyrite, calcite, chalcopyrite, quartz, albite, etc.), and second, to identify if the analyses of stable isotopes combined with field and laboratory information are determinant and useful for the exploration of emeralds in the WEB. Geological information such as structural data, identification of debris flows, hydrothermal and hydraulic breccia as well as mineral assemblage were collected during the field trip. For microscopic analyses, 17 samples were characterized by petrographic observations, such as microstructures, mineral habits, paragenesis and deformation parameters. The identification of different carbonates and supergene minerals was conducted with a RAMAN spectrometer and Scanning Electron Microscope (SEM).
The main conclusions of this research suggest that: 1. the mineralizing fluids came from a metamorphic / sedimentary origin. 2. A range for 18O (SMOW) between 18 to 21.8 ‰ and -4 to -10.3‰ for 13C (PDB) represents the isotopic signatures of the hydrothermal fluids which produced the emerald mineralization for the visited mines. 3. Calcites from the Muzo Formation in the WEB would have the possibility of being associated with emeralds, if apart from being in the previously mentioned ranges of isotopic values; the carbonate is in paragenesis with sulphides, albite and/or quartz originating from either hydrothermal or hydraulic breccia associated with thrust planes, folds and overthrust faults. For exploration purposes, it is important to define debris flows to avoid mining development in such areas.
URI: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/2724
DOI: 10.6342/NTU201703972
全文授權: 同意授權(全球公開)
顯示於系所單位:地質科學系

文件中的檔案:
檔案 大小格式 
ntu-106-1.pdf21.03 MBAdobe PDF檢視/開啟
顯示文件完整紀錄


系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。

社群連結
聯絡資訊
10617臺北市大安區羅斯福路四段1號
No.1 Sec.4, Roosevelt Rd., Taipei, Taiwan, R.O.C. 106
Tel: (02)33662353
Email: ntuetds@ntu.edu.tw
意見箱
相關連結
館藏目錄
國內圖書館整合查詢 MetaCat
臺大學術典藏 NTU Scholars
臺大圖書館數位典藏館
本站聲明
© NTU Library All Rights Reserved