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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 宋聖榮(Sheng-Rong Song) | |
dc.contributor.author | GERMAN DAVID MORENO BOADA | en |
dc.contributor.author | 柏合曼 | zh_TW |
dc.date.accessioned | 2021-06-17T02:21:04Z | - |
dc.date.available | 2021-02-19 | |
dc.date.copyright | 2021-02-19 | |
dc.date.issued | 2021 | |
dc.date.submitted | 2021-02-17 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/68438 | - |
dc.description.abstract | The Colombian Early Cretaceous rocks in the Eastern Cordillera Basin have been of particular relevance for geoscientists since those rocks host the worldwide famous emerald deposits that have been the subject of several studies. This study is centered on the Las Pavas emerald mining title where 19 samples were collected to obtained detailed elemental geochemistry analysis using several techniques such as X-ray Fluorescence (XRF), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The mineralogy along with the major, trace and rare earth (REE) elements concentrations were analyzed, according to their distribution, enrichment and depletion within the samples studied. Results obtained in samples collected inside Las Pavas mine, show negatives anomalies of SiO2, TiO2, Al2O3 and K2O and high concentrations of MnO, MgO and CaO contrasting with higher concentrations of the same major elements from outcrops. Trace elements Be, V, Cr, Rb, Sc, Cs, Ba, Y, Co, Cu, Ga, Pb, Th, U, Zr, Hf, Nb and, W are enriched in the outcrop sections (Itoco and Las Pavas) compared to the tunnels. Itoco samples present the highest concentrations of REE followed by Las Pavas and finally the tunnel samples. Regarding the mineralogy, high contents of albite, calcite and dolomite provide the evidence of the albitization and carbonation processes that affected the country rocks. Thus, samples within the tunnels that are closer to the emerald mineralization, show negative anomalies of some major, trace and rare earth elements along with a characteristic mineralogy compared to outcropping samples. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T02:21:04Z (GMT). No. of bitstreams: 1 U0001-1002202101523500.pdf: 6236641 bytes, checksum: fb58d6547a5ce25ec19369a8646a3684 (MD5) Previous issue date: 2021 | en |
dc.description.tableofcontents | Chapter 1. INTRODUCTION 1 1.1 LOCATION 3 1.2 REGIONAL GEOLOGY 5 1.3 LITHOSTRATIGRAPHY 10 1.3.1 FURATENA FORMATION 10 1.3.2 MUZO FORMATION 11 1.3.3 CAPOTES FORMATION 13 1.4 STRUCTURAL GEOLOGY 13 1.4.1 FAULTS 13 1.4.2 FOLDS 15 1.5 EMERALD MINERALIZATION 17 Chapter 2. METHODS 20 2.1 SAMPLES COLLECTION 20 2.1.1 ITOCO RIVER STRATIGRAPHIC SECTION 20 2.1.2 LAS PAVAS STRATIGRAPHIC SECTION 21 2.1.3 TUNNEL SAMPLES 21 2.2 SEDIMENT ANALYSES 23 2.2.1 X-RAY DIFFRACTION (XRD) 23 2.2.2 X-RAY FLUORESCENCE 27 2.2.3 SCANNING ELECTRON MICROSCOPY 29 2.2.4 INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY 31 Chapter 3. RESULTS 33 3.1 MINERALOGICAL COMPOSITION 33 3.2 SEM OBSERVATIONS 38 3.3 WHOLE- ROCK GEOCHEMISTRY 46 3.3.1 DISTRIBUTION OF MAJOR ELEMENTS 46 3.3.2 DISTRIBUTION OF TRACE ELEMENTS 48 3.3.3 DISTRIBUTIONS OF RARE EARTH ELEMENTS 51 Chapter 4. DISCUSSION 57 4.1 PROVENANCE AND TECTONIC SETTING 57 4.2 VARIATION OF MAJOR ELEMENTS 60 4.3 VARIATIONS OF TRACE ELEMENTS 68 4.4 VARIATIONS OF RARE EARTH ELEMENTS 74 4.5 ALTERATION DOMAINS IN THE LAS PAVAS MINING TITLE AND ITS IMPLICATION IN THE MINERALOGY AND GEOCHEMISTRY 75 4.6 FACTORS AFFECTING THE HYDROTHERMAL ALTERATION 79 Chapter 5 CONCLUSIONS 83 REFERENCES 85 APPENDIX A 101 APPENDIX B 102 APPENDIX C 103 | |
dc.language.iso | en | |
dc.title | "Geochemical characteristics of Early Cretaceous shales from Las Pavas mining title in the Western Emerald Belt, Colombia" | zh_TW |
dc.title | Geochemical characteristics of Early Cretaceous shales from Las Pavas mining title in the Western Emerald Belt, Colombia | en |
dc.type | Thesis | |
dc.date.schoolyear | 109-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 陳惠芬 (Hui-Fen Chen),郭力維(Li-Wei Kuo) | |
dc.subject.keyword | 水熱蝕變,交際主義,翡翠礦床,仲裁,碳化, | zh_TW |
dc.subject.keyword | Hydrothermal alteration,Metasomatism,Emerald deposits,Albitization,Carbonation, | en |
dc.relation.page | 104 | |
dc.identifier.doi | 10.6342/NTU202100692 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2021-02-18 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 地質科學研究所 | zh_TW |
顯示於系所單位: | 地質科學系 |
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