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研究生:古斯
研究生(外文):Kabelen, Agustinus Kelodeng
論文名稱:豐田閃玉層序在換質過程中磁鐵礦與鉻鐵礦的化學反應
論文名稱(外文):Chemical Reaction of Magnetite and Chromite within Fengtien Nephrite Sequence During Metasomatism Process
指導教授:陳惠芬陳惠芬引用關係
指導教授(外文):Chen, Huei-Fen
口試委員:葉恩肇郭力維
口試日期:2020-01-30
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:地球科學研究所
學門:自然科學學門
學類:地球科學學類
論文種類:學術論文
論文出版年:2020
畢業學年度:108
語文別:英文
論文頁數:97
中文關鍵詞:豐田閃玉透輝石脈蛇紋岩環帶狀鉻鐵礦換質作用
外文關鍵詞:Fengtiennephritediopside-veinserpentinitechromitemetasomatism
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豐田閃玉礦床出現於蛇紋岩體和片岩接觸帶,並常與透輝石一同以透鏡體或脈狀相鄰產出,然而前人研究卻鮮少針對閃玉與透輝石脈的接觸關係進行探討。因此本研究透過豐田閃玉帶上的閃玉礦場包含:理新礦場、山益與天星礦場之地質調查, 針對閃玉換質剖面產出之岩石如:蛇紋岩、閃玉、透輝石脈之採樣,並以X光粉末繞射儀、拉曼光譜儀、掃描式電子顯微鏡及能量散佈光譜儀與電子微探分析儀分析之,以獲取此換質剖面之礦物生長序列。分析結果顯示研究於豐田地區所採集之蛇紋岩樣品主要由葉蛇紋石,磁鐵礦和鉻鐵礦組成,而岩體裂隙中則由纖蛇紋石、滑石和斜鎂綠泥石充填。閃玉則由透閃石-陽起石、鉻鐵礦,與少量的滑石、斜鎂綠泥石和軟錳礦所組成。另透輝石脈中除透輝石本體,並有鈣鐵榴石、鈣鋁榴石、鉻鐵礦,斜鎂綠泥石,和微量的紅鎳礦生長其中,並被方解石或透閃石細脈侵入。根據岩樣的產狀觀察與細部分析比較後,研究進一步發現呈現深色且不透光之金屬氧化礦物的數量在蛇紋岩、閃玉、透輝石脈中依序遞減。蛇紋岩和閃玉中的鉻體礦從核心到外圍的Fe3+和Cr3+逐漸增加,其核心接近尖晶石成分富含Al 和Mg的成分。這原始的尖晶石和鉻鐵礦成份可能源自於橄欖石母岩。環帶狀鉻鐵礦的組成從內部核心以Al含量為主轉變到外部以Fe含量為主的鉻鐵礦,並且伴隨著Mn 和Zn含量的增加。在換質過程中蛇紋岩中的磁鐵礦溶解,造成閃玉中只剩下殘留的鉻鐵礦,同時鉻鐵礦的外圍Mn含量減少卻增加了更多的Zn含量。最後,透輝石生成的階段,Al從含鋁之鉻鐵礦內部區域擴散出來,並形成石榴石礦物,且留下更均質的富鐵鉻鐵礦。因此我們認為透輝石脈是與閃玉同時或於其後形成的。
Fengtien nephrite deposit is emplaced between serpentinite and schist, but it always intergrows with diopside in a lens shape or vein structure. Since previous studies did not discuss the relation between nephrite and diopside-vein, we therefore investigated three nephrite mines: Lixin mine, Shanyi mine and Tianxing mine, and collected serpentinite, nephrite and diopside-vein samples to conduct the XRD, Raman, SEM-EDS and EPMA experiments in order to evaluate their formation sequences. Serpentinite samples from Fengtien area are mainly composed of antigorite, magnetite, and chromite, and the fractures are partly filled by chrysotile, talc, and clinochlore. Fengtien nephrite comprises tremolite, actinolite and chromite with minor talc, clinochlore, and pyrolusite. In general, the diopside-vein consists of diopside, andradite, grossular, chromite, clinochlore, with minor nickeline and partially intruded by calcite or tremolite veinlet. Based on our observation, we found that the amount of black metal-oxide minerals decreases from serpentinite to nephrite, and from nephrite to diopside-vein. Fe2+ and Cr3+ are enriched from inner core to the rim of chromite both in serpentinite and nephrite. Al and Mg which concentrated in the core of chromite are close to spinel composition. The original spinel and chromite phase may originate from the peridotite. The composition of zoning chromite changes from Al-chromite in the core to Fe-chromite in the rim and accompanies the enrichment of Mn and Zn concentrations. During the metasomatism process magnetite within serpentinite dissolved and remained chromite within nephrite. By this stage, the outer rim of chromite dissolved and decreased Mn content, but increased Zn content. At the last stage of diopside deposit, Al diffused from the inner zone (Al-chromite) to form garnet minerals and left more homogeneous Fe-chromite. Therefore, we considered that diopside-vein is formed concurrently or subsequently with the formation of nephrite.
ACKNOWLEDGMENTS I
摘要 II
ABSTRACT III
LIST OF CONTENTS IV
LIST OF FIGURE VI
LIST OF TABLE IX
CHAPTER I INTRODUCTION 1
1.1. Background of Study 1
1.2. Objectives of Study 2
1.3. Location of Study Area 2
1.4. Previous Study 3
CAHPTER II REGIONAL GEOLOGY 9
2.1. Regional Metamorphic Events and Tectonic Evolution 9
2.2. Regional Lithostratigraphy 12
2.3. Regional Geomorphology 13
CHAPTER III RESEARCH METHODS 15
3.1. Research Process 15
3.2. Analytical Method 16
2.2.1. Petrography Analysis 16
2.2.2. X-Ray Diffraction (XDR) 17
2.2.3. Raman Spectroscopy 19
2.2.4. Scanning Electron Microscopy with Energy Dispersive
Spectroscopy (SEM-EDS) 20
2.2.5. Electron Probe Micro Analyzer (EPMA) 22
CHAPTER IV RESULTS 28
4.1. Field Observation Result 28
4.2. Lithology Description 31
4.3. Mineral Compositions 37
4.3.1. Thin Section Result 37
4.3.2. Raman Spectroscopy Analysis Result 38
4.3.3. X-Ray Diffraction Analysis Result 42
4.3.4. Summary of Mineral Assemblages 51
4.4. Chemical Analysis Data 51
CHAPTER V DISCUSSION 68
5.1. Geological Profile of Fengtien Nephrite Deposit and Related Rocks 68
5.2. Mineral Properties of Fengtien Serpentinite, Nephrite and
Diopside-Vein 71
5.3. Chemical Compositions of Black Metal Oxide Minerals Within
Fengtien Serpentinite, Nephrite and DiopsideVein 73
CHAPTER VI CONCLUSSION 83
REFFERENCES 84
APPENDIX 80
Appendix 1. Outcrop and Sample Locations 87
Appendix 2. List of Analyzed Samples and Minerals Assemblages 90
Appendix 3. More EPMA Pictures (Elemental Mapping) 96

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