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題名 | Petrology, Geochemistry and Nd-Sr Isotope of Late Miocene Basalts in Liehyu and Chinmen, Fujian=福建烈嶼與金門晚中新世矽質玄武岩之岩石學、地球化學與釹--鍶同位素研究 |
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作者姓名(中文) | 藍晶瑩; 鍾孫霖; 馬茲門; 許文昱; | 書刊名 | 中國地質學會會刊 |
卷期 | 37:3 1994.07[民83.07] |
頁次 | 頁309-334 |
分類號 | 358.38 |
關鍵詞 | 晚第三紀玄武岩; 烈嶼與金門; 地球化學; 釹-鍶同位素; Neogene basalt; Liehyu and chinmen; Geochemistry; Nd-Sr isotope; |
語文 | 英文(English) |
中文摘要 | 烈嶼與金門地區晚中新世的玄武岩屬矽質玄武岩。斑晶主要由 斜長石(鈣長石含量42至66%),斜輝石(普通輝石、次鈣輝石至 鎂易變輝石),及少量橄欖石(鎂橄欖石含量76至81%),鉻尖晶 石及鈦鐵礦等組成。這些矽質玄岩呈現輕稀土元素中度富集的分 佈形態圖,球粒隕石標準化後的鑭含量為28.9至42.7,鑭/鎦比值 為3.7至5.5。在鋯/釔對鋯,鈦--鋯--釔及鉿--釷--鉭等岩漿地體 構造鑑別圖中,這些矽質玄武岩的成份皆落於板塊內部玄武岩的範 圍。在原始地函標準化之元素分佈圖,並未顯示高場力元素(如鉭 及鈮)虧損的特徵。鍶同位素比值侷限於0.7042至0.7045間,釹同 位素值在正1.0至正3.5間。整體觀之,烈嶼與金門地區的矽質玄武 岩,與福建東南、澎湖群島及臺灣西北部的晚第三紀玄武岩,在礦 物、岩石地球化學及鍶--釹同位素組成,皆顯示一致的特性。這些 玄武岩,更與海南島及南中國海的板內洋島玄武岩呈現類似的地球 化學與同位素特性。所有這些板塊內部玄武岩的生成,皆導因於華 南大陸拉張作用所引起的上地函減壓熔融、其間並伴隨了岩石圈與 軟流圈的交互作用。 |
英文摘要 | Late Miocene basaltic rocks occur in Liehyu and Chinmen and are generally tholeiitic in nature. Mineralogically, plagioclase (An) and clinopyroxene (augite, subcalcic augite to magnesium pigeonite) with minor olivine (Fo), picotite (Cr-spinel) and ilmenite constitute the phenocrysts. These tholeiites are moderately LREE-enriched ((La)��=28.9 to 42.7 and (La/Lu)��=3.7 to 5.5). they plot in the within-plate basalt field on Zr/Y versus Zr, Ti/100-Zr-3Y and Hf/3-Th-Ta tectonomagmatic discrimination diagrams. No depletion of the high field strength elements (e. g. Ta and Nb) is observed in the primitive-mantle-normalized diagram. Their Sr isotopic ratios have a limited range of 0.7042 to 0.7045, while the εNd values vary from +1.0 to +3.5. Overall, the tholeiites on Liehyu and chinmen exhibit coherent mineralogical, petrochemical and Sr-Nd isotopic trends with their Neogene counterparts in SE Fujian, the Penghu Islands and in NW Taiwan. In fact, samples from all of these areas display similar geochemical and isotopic characteristics with intraplate basalts from Hainan Island and seamount basalts from the South China Sea. Likewise, all these intraplate basalts were generated by decompressional melting, coupled with lithosphere-asthenosphere interactions, resulting from the continental extension related to the opening of the South China Sea. |
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