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題 名 | Sulfide-bearing Quartz Veins in the Szeleng Sandstone, Chinmienshan, Northeastern Taiwan:A Preliminary Study on Fluid Inclusions and Stable Isotopes=臺灣北部金面山地區四稜砂岩中之含硫化礦物石英脈:液包體及穩定同位素初探 |
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作 者 | 俞震甫; 朱傚祖; 王詠絢; 葉慈豪; | 書刊名 | 中國地質學會會刊 |
卷 期 | 40:4 1997.10[民86.10] |
頁 次 | 頁723-742 |
分類號 | 357.42 |
關鍵詞 | 穩定同位素; 液包體; 閃鋅礦-方鉛礦-黃鐵礦-方解石-石英脈; Stable isotopes; Fluid inclusions; Sphalerite-galena-pyrite-calcite-quartz vein; |
語 文 | 英文(English) |
中文摘要 | 臺灣北部金面山地區在四稜砂岩中發現了閃鋅礦 -- 方鉛礦 -- 黃鐵礦 -- 方解 石 -- 石英脈,部份石英脈中硫化礦物含量相當豐富, 暗示了本地區可能有一潛藏的鉛 -- 鋅礦床。 石英脈中共計有五種類型的液包體。第一至第四種類型液包體主要成份為水、二氧化碳及溶 解鹽,這些液包體應與形成硫化礦物之熱液有關;二氧化碳含量的變化,以及全均一溫度與 鹽度 / 二氧化碳含量間的關係, 指示了形成這些液包體(除了那些全均一溫度低於攝氏二 百一十度的第三種類型液包體)的熱液可能為同源,經由熱液沸騰(不互溶)作用所產生; 但是由於缺乏沸騰(不互溶)熱液同時共存的必要証據,這些熱液亦可另解為具有不同的來 源。第五種類型液包體因爆破而喪失液體組成,爆破的原因可能與硫化礦物形成時之降壓 / 熱液加溫有關。 本地區硫化礦物的最高形成溫度應不低於攝氏三百度,最高壓力則應不低於三百耙。這些硫 化礦物的形成可能肇因於潛藏火成岩體的侵入。 硫化礦物之硫同位素組成範圍為 +3.2 至 +6.9 □,指示了形成硫化礦物的硫可能有多重來源,或者某些岩漿演化作用 / 硫化礦物形 成作用曾有效的富集□ S。石英及方解石的氧同位素值指示了熱液的氧同位素組成主要為岩 石所控制,因此根據目前的同位素資料,尚無法判定熱液的來源。 |
英文摘要 | Sphalerite-galena-pyrite-calcite-quartz veins in the Szeleng Sandstone were found in the Chinmienshan area, northeastern Taiwan. The abundance of the sulfide minerals in some of these veins may indicate the presence of a hidden Pb-Zn deposit. Fluid inclusions in the quartz veins can be divided into five types. Types Ⅰ to Ⅳ fluid inclusions contain variable amounts of H�烙, CO�畝nd dissolved salts and may be genetically related to the fluids responsible for the sulfide formation. Variable CO�畚ontent, as well as the correlations between total homogenization temperature and salinity/CO�畚ontent of these fluid inclusions (except those Tyep Ⅲ inclusions with total homogenization temperature lower than 210℃) suggest that the responsible fluids could be cogenetic through fluid boiling (fluid immiscibility). On the other hand, the lack of unambiguous prove for the coexistence of fluid-rich and vapor-rich inclusions with appropriate compositions and similar total homogenization temperatures also suggests that the fluids may have different origins. Type Ⅴ inclusions are empty due to decrepitation, which may have resulted from decompression/heating during sulfide formation. The highest formation temperature of these sulfides would not have been lower than 300℃ and the highest pressure, not lower than 0.3 kbar. These sulfides are most probably genetically related to a concealed igneous intrusion. Their sulfur isotopic compositions range from +3.2 to +6.9□, implying that either these sulfides have multiple sulfur sources or some reactions have effectively fractionated heavy sulfur during igneous evolution and/or sulfide formation. δ�XO values of quartz and calcite indicate that the oxygen isotopic compositions of the responsible fluids were mainly buffered by the rocks. The origin(s) of these fluids, therefore, can not be discerned based on the available data. |
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