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題名 | Geochemical Characteristics of Metabasites from the Slate formations of Taiwan=臺灣板岩地層中變質基性岩之地化特徵 |
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作者 | 俞震甫; 吳才煒; 盧佳遇; | 書刊名 | 中國地質學會會刊 |
卷期 | 37:1 1994.01[民83.01] |
頁次 | 頁53-67 |
分類號 | 358.63 |
關鍵詞 | 地球化學; 變質基性岩; 臺灣; Geochemistry; Metabasites; Taiwan; |
語文 | 英文(English) |
中文摘要 | 本文分析了臺灣皮岩地層中變質基性岩之地化特徵。結果顯 示這些變質基性岩可分為二群:一群具有島弧(鈣鹼)系列火山 岩之化學特性,另一群則具板塊內(鹼性)火山岩之化學特徵。 前種變質基性岩多出露於始新世板岩層中,而後者則出露於中新 世板岩層中。本文考慮了板塊內火山岩可能顯現島弧地化特性的 問題,並討論了本文結果在不同地體構造架構模式下的意義。 |
英文摘要 | Metabasites from the slate formations of Taiwan were analyzed in the present study for their major and trace element compositions. Based on the available tectono-discrimination diagrams and -spidergram, these metabasites can be geochemically distinguished into two groups: one with volcanic-arc (calc-alkaline)affinity and the other with within-plate (alkali) affinity. The former metabasites outcrop within slate formations of the Eocene age, whereas the latter, in slate formation of the Miocene age. The well-known fact that some continental basalts may show volcanic-arc chemical signatures is considered. The tectonic implications of the present results under different tectono-frameworks are discussed. |
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