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題名 | Factors Controlling the Distribution of Zeolites in the Andesitie Rocks of the Central Coastal Range of Eastern Taiwan=控制東臺灣海岸山脈中段安山岩中沸石分佈的因素 |
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作者 | 羅煥記; 宋聖榮; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷期 | 11:2 2000.06[民89.06] |
頁次 | 頁501-504 |
分類號 | 358.36 |
關鍵詞 | 海岸山脈; 安山岩; 沸石; Natrolite; Phillipsite; Andesitic rocks; |
語文 | 英文(English) |
英文摘要 | This study is a survey of zeolites in the andesitic rocks of the CentralCoastal Range (CCR) of eastern Taiwan. Methods of the study include fieldobservations and laboratory techniques such as X-ray diffraction, petrography, and scanning electron microscopy. It is found that zeolites arc abundant only in the andesitic rocks alongtwo streamlets, i.e., Tuwei-Hsi (TH) and Yungshui-Hsi (YH), and are rareto absent in others. Zeolites generally occur in hyaloclastites but rarely inlava flows in the TH section. On the other hand, breccias are usually richerin zeolites than lava flows, peperites, and tuffs in the YH section. Natroliteis the unique zeolite in TH hyaloclastites. It usually associates with apophyllite and calcite. Phillipsite is the only zeolite in YH breccias. It mostlyoccurs alone and occasionally associates with calcite. The duration of exposure to seawater is considered as the main factorinfluencing the amount of zeolites in submarine erupted andesitic rocks ofthe CCR. The longer the andesitic rocks are exposed to seawater, the largerthe amount of zeolites would be in them. On the other hand, the species ofzeolite and related authigenic minerals in the andesitic rocks of the CCRare presumably controlled by the kind of their phenocrysts which are theessential minerals suffered from alteration. |
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