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題名 | Melting of Two-Pyroxene Andesite from the Kuanyinshan Area, Northern Taiwan, up to 2.0 GPA=臺灣北部觀音山兩輝安山岩在壓力高達二京帕以下之實驗岩石學研究 |
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作者 | 劉德慶; 陳博信; 陳正宏; | 書刊名 | 中國地質學會會刊 |
卷期 | 42:3 1999.08[民88.08] |
頁次 | 頁359-384 |
分類號 | 358.36 |
關鍵詞 | 安山岩; 觀音山; 結晶分化; 岩漿; Andesite; Kuanyinshan; Fractional crystallization; Magma; |
語文 | 英文(English) |
中文摘要 | 本研究係採用活塞鋼圈高壓儀對臺灣北部觀音山地區之兩輝安山岩做高溫高壓實 驗,本實驗之目的在延續萬年塔玄武岩之結晶分化研究,將所有觀音山之岩型全部涵蓋在岩 漿分化的範疇裡,並估計結晶分化所進行之深度。 實驗結果顯示一京帕(GPa)下,兩輝安山岩之液相溫度和固相溫度分別為1255和1070 ℃左右,其結晶次序為斜長石、直輝石和石英。而二京帕下之液相溫度和固相溫度分別為1285 和1140℃左右,近液相礦物為直輝石和角閃石。之後,出現斜長石、斜輝石、石榴子石等 礦物。液相溫度隨壓力增加而增加,增加速率約為28℃╱GPa。本文結果顯示,觀音山玄 武岩質岩漿結晶分化生成各種不同成份安山岩質岩漿之深度應在30公里以內(即地殼中)。 |
英文摘要 | A two-pyroxene andesite from Kuanyinshean, northern Taiwan, was studies with a piston- cylinder apparatus at pressures up to 2.0 Gpa. The purpose of this study was to investigate the crystallization sequence of the phenocrysts, to analyze their chemical composition, and to determine the evolution trend of the magma. The liquidus and solidus temperatures of the two-pyroxene andesitic magma at 1.0 GPa were estimated as 1255 and 1070℃, respectively. The crystallization sequence of the andesitic magma at 1.0 Gpa was determined as: plagioclase (andesine in composition), enstatite and quartz. The liquidus and solidus temperatures of the andestic magma at 2.0 Gpa were determined as 1285 and about 1140 ℃, respectively. The near-liquidus phases at 2.0 Gpa were enstatite and hornblende. They were followed by several phases, such as plagioclase, augite and garnet at lower temperatures. Overall, liquidus temperatures increased at a rate of about 28℃/Gpa. The results of this study suggested that fractionation from the Kuanyinshan basaltic magma to the andesitic magma took place at pressures between one atmosphere and 1.0 Gpa. The Kuanyinshan basaltic magma is capable to produce andesitic magmas of various compositions, which are present in the field. |
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