臺灣三峽文石的礦物組成與化學特徵

Mineral compositions and chemical characterizes of Taiwan Sanshia Wenshi

陳韻婕(Yun-Chie Chen)

《國立臺灣博物館學刊》 72卷1-4期 (2019/12) Pp. 55-70

https://doi.org/10.6532/JNTM.201912_72(1_4).04

摘要

三峽文石主要分布於臺灣北部三峽至竹東一帶，本研究採樣地區為新北市五寮、詩朗、桃園復興三民橋及竹東四點，利用顯微拉曼光譜儀、能量色射光譜儀等儀器對各產地的礦物作鑑定與化學成分分析，欲了解各產地之文石基本特性，與探討文石在玄武岩孔隙充填的先後順序。三峽文石的同心圓條帶呈現三種表現方式，包含礦物相及礦物顆粒大小具重複性生長、礦物結晶大小由同心圓中央向外漸增，以及由礦物層間孔隙經光線散射所造成的同心圓。利用拉曼光譜儀分析出共有十種礦物相，主要以碳酸鹽類及矽酸鹽類礦物組成，其中方解石最常出現。另以能量色散光譜儀分析化學成分，結果顯示碳酸鹽類礦物以鈣、鎂、鐵成分為主，且在文石中顏色較深的地方，常會伴隨孔隙出現，並容易造成微量元素聚集，除沉澱文石的礦液條件變化，加上外在沉積環境的影響，使得各地文石離子取代情況不盡相同。

關鍵字

碳酸鹽類礦物 ； 矽酸鹽類礦物 ； 方解石 ； 玄武岩 ； 拉曼光譜

並列摘要

Sanshia Wenshi are distributed from Shanshia to Chutung in northern Taiwan, and samples are collected from Wuliao (WL), Shihlang (SL), Sanminchiau (SMC), Chutung (CT) of four outcrops. The author uses Micro-Raman and SEM-EDS to analyze the mineral and chemical compositions of Wenshi collected from different locations, in order to realize the basic characterizes and crystalline precipitation sequences. There are three expressions in concentric strips of mineral combination. First, mineral facies and crystalline size have repetitive arrangement; second, crystalline size increases gradually from center to edge in concentric circles; the last one is that concentric circles are caused by light scattering to porosities between layers of mineral facies. The results can be divided into ten types of mineral facies by Raman analyzing, including carbonates and silicates mostly, especially calcite. On the other hand, Energy dispersive Spectroscopy is used to analyze the chemical compositions and distributions. Trace elements are almost made up by calcium, magnesium, and iron ion in carbonates which easily assemble to pores to make deep color. In addition to variety of properties of ore fluid precipitation, external environmental conditions also affect ion substitutions in various locates.

並列關鍵字

carbonates ； silicates ； calcite ； basalt ； Raman Spectrums

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