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題 名 | 榮華地區玄武岩中超基性捕獲岩與偉晶的岩象學與礦物化學研究=The Petrography and Mineral Chemistry of Ultrmafic Xenoliths and Megacrysts in Basaltic Rocks from Junghua, Northern Taiwan |
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作 者 | 鐘三雄; | 書刊名 | 經濟部中央地質調查所彙刊 |
卷 期 | 23 2010.12[民99.12] |
頁 次 | 頁1-33 |
分類號 | 358.38 |
關鍵詞 | 超基性捕獲岩; 偉晶; 岩象學; 礦物化學; Ultramafic xenoliths; Megacrysts; Petrography; Mineral chemistry; |
語 文 | 中文(Chinese) |
中文摘要 | 臺灣北部橫貫公路榮華地區所出露的玄武岩體中常含有超基性捕獲岩與偉晶,惟受到後期蝕變作用,這些超基性捕獲岩的橄欖石與直輝石都已被次生礦物取代;而由所殘餘的原生斜輝石與尖晶石等礦物化學特性與岩象特徵,指示這些超基性捕獲岩大多屬於第I 型地函捕獲岩,屬於上部地函物質被上升的後期鹼性玄武岩漿捕獲而噴發至地表;其中,部分超基性捕獲岩可能代表上部地函經過相當程度部分熔融後的殘餘物質。此外,部分超基性捕獲岩含有脈狀鈦角閃石與金雲母等礦物群,顯示在漸新世時期榮華地區的上部地函組成早已受有地函交代換質作用。 榮華地區的偉晶種類,以黑色斜輝石最常見,其次分別為鈦角閃石、金雲母與綠色斜輝石等。過去研究指出榮華地區甚少有角閃石偉晶的發現,惟本研究發現在榮華地區溪谷的火山礫凝灰岩轉石中普遍含有鈦角閃石偉晶。依據岩象學與礦物化學特性,本研究認為黑色高鋁質斜輝石偉晶、綠色高鉻質斜輝石偉晶與鈦角閃石偉晶均應屬於早期鹼性玄武岩漿在高壓環境下的流動結晶作用之沉聚產物,再被後期岩漿夾帶而噴發至地表上。至於金雲母偉晶的成因,推測應屬於外來晶,惟其成因與母岩漿性質尚待後續研究與探討。 |
英文摘要 | Abundant megacrysts of clinopyroxene, kaersutite, and phlogopite have been found to be associated with the moderately to strongly altered ultramafic xenoliths in the basaltic rocks in Junghua, northern Taiwan. Based on the chemical compositions of the residual primary clinopyroxenes and spinels in the altered ultramafic xenoliths, most belong to the type I mantle xenoliths. Some containing spinels with high Cr/(Cr+Al) ratios may be residual refractory mantle material of partial melting. Some ultramafic xenoliths containing veins of kaersutites and phlogopites indicate that the upper mantle in the Junghua area may have been metasomatized due to complicated process since Oligocene. Physical properties, mineral chemistry and petrographic textures strongly suggest that clinopyroxene and kaesutite megacrysts are xenocrysts in origin and represent cumulates of flow crystallization by earlier basaltic magmas at depth which were captured by later alkali basaltic eruptions and transported to the surface. Phlogopites are not crystallization products of the basaltic magmas; therefore, the phlogopite megacrysts are considered to be xenocrysts of the host basaltic rocks. |
本系統中英文摘要資訊取自各篇刊載內容。