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題名 | The Occurrence of Pseudobrookites and Other Minerals in Cavities of the Strongly-oxidized Andesites from the Coastal Range of Eastern Taiwan=臺灣東部海岸山脈遭受強烈氧化的安山岩氣孔中鐵板鈦礦及其它礦物之研究 |
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作者 | 楊宏儀; 林士欽; 林裕庭; | 書刊名 | 中國地質學會會刊 |
卷期 | 40:4 1997.10[民86.10] |
頁次 | 頁709-722 |
分類號 | 358.36 |
關鍵詞 | 鐵板鈦礦; 氧分壓; 氧化作用; 氣孔; 安山岩; Pseudobrookite; Oxygen fugacity; Oxidation; Cavities; Andesite; |
語文 | 英文(English) |
中文摘要 | 臺灣東部海岸山脈遭受強烈氧化的安山岩中的氣孔中有原生鐵板鈦礦、鈦鐵礦和 赤鐵礦、古銅輝石、普通輝石、綠泥石,以及二氧化矽礦物等充填。 氣孔中的充填礦物可分為四期:古銅輝石、普通輝石和鱗石英在第一期中晶出,鈦磁鐵礦和 鈦鐵礦也在第一期中晶出,但在第二期遭受強烈的氧化,在第三期則遭受還原。原生鈦鐵礦 和原生赤鐵礦在第二期結晶出來,但原生鐵板鈦礦則在第三期晶出。石英、玉髓和非晶質二 氧化矽和綠泥石在第四期晶出,把氣孔填滿。 原生鐵板鈦礦、原生赤鐵礦、鱗石英和非晶質二氧化矽可能是從氣相中直接形成。鐵板鈦礦 的存在指示氣孔形成時處於溫度高於 585 ℃,以及氧分壓高於赤鐵礦 / 磁鐵礦緩衝線的強 烈氧化環境。 |
英文摘要 | Primary pseudobrookite, strongly-oxidized titanomagnetite and ilmenite, primary ilmenite and hematite, bronzite, augite, silica minerals, and chlorite are found in the cavities of the stronglyoxidized andesites from the Coastal Range of eastern Taiwan. Mineral formation in the cavities can be divided into four stages. Bronzite, augite, and tridymite crystallized in the first stage. Titanomagnetite and ilmenite also crystallized in the first stage, but were strongly oxidized in the second stage and reduced in the third stage. Primary pseudobrookite and primary hematite crystallized in the second stage, while the primary ilmenite appeared in the third stage. Quartz, chalcedony, amorphous silica, and chlorite precipitated in the final stage to fill up the central portion of the cavities. Primary pseudobrookite, primary hematite, tridymite, and amorphous silica are thought to have formed directly from vapor phase. Existence of pseudobrookites indicated a temperature higher than 585℃ and a very oxidizing atmosphere with an oxygen fugacity higher than H/W buffer in the cavities. |
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