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題 名 | Mineralogy and Geochemistry of Granitic Rocks from Chinmen, Liehyu and Dadan Islands, Fujian=福建金門、烈嶼及大膽花岡岩類岩石之礦物學及地球化學研究 |
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作 者 | 藍晶瑩; 鍾孫霖; | 書刊名 | 中國地質學會會刊 |
卷 期 | 40:3 1997.07[民86.07] |
頁 次 | 頁527-558 |
分類號 | 358.43 |
關鍵詞 | 晚燕山期花岡岩類岩石; 福建外海島嶼; 金門; 烈嶼; 大膽; 礦物學; 地球化學; Late yanshanian granitic rocks; Offshore islands of fujian; Chinmen; liehyu and dadan; Mineralogy; Geochemistry; |
語 文 | 英文(English) |
中文摘要 | 福建外海金門、烈嶼及大膽等島嶼的花岡岩類岩石年齡為139±0.4及100.9±0.5 百萬年,分屬大陸東南晚燕山期岩漿活動的第一幕及第三幕產物。岩性以花岡岩為主,石英 二長岩、花岡閃長岩、奧長花岡岩及英雲閃長岩為輔。這些花岡岩類岩石,含不等量的石英、 鉀長石(Or□)、斜長石(An□)、黑雲母、白雲母及鈣質閃石(鐵韭角閃石至鐵角閃石)。大部 分的花岡岩類岩石為過鋁質岩(三氧化二鋁對氧化鈣、氧化鈉及氧化鉀總和之比值大於1.0, 計算標準礦物的剛玉含量大於1%),且表現輕稀土元素中度分異,而銪元素負異常的分佈形 態圖。然而有些花岡岩則呈現重稀土元素富集而輕稀土元素貧乏的現象。在原始地函標準化 之微量元素分佈圖,顯示與隱沒帶岩漿岩類似的鈮元素虧損的特徵。在Pearce等(1984)的地 體構造鑑別圖中,這些花岡岩類岩石的成份,落於火山島弧的範圍。總體言之,這些福建外 海島嶼的花岡岩類岩石,顯示高鉀鈣鹼性至鹼長基玄武岩性的地化特性,符合常見的I型花 岡岩特性。然而部分黑雲母成份類似A型花岡岩中的黑雲母成份,且這些花岡岩類岩石常被 許多晚白堊紀基性岩脈所截切。綜合福建沿海的地質資料,指示福建外海島嶼中的晚白堊紀 花岡岩類岩石正處於中國東南大陸邊緣由後造山運動而轉為張裂的構造環境。岩石中所呈現 與島弧作用有關的地化特性,應源自前已受隱沒作用影響的母岩。其與晚白堊紀(約90百萬 年)處於聚合板塊邊緣的臺灣花岡岩類岩名有所不同。 |
英文摘要 | The granitic rocks from Chinmen, Liehyu and Dadan, three offshore islands of Fujian, were emplaced in 139.4±0.4 Ma and 100.9±0.5 Ma, corresponding to the first and the third episodes, respectively, of late Yanshanian magmatism in SE China. These rocks consist predominantly of granite, with subordinate quartz monzonite, granodiorite, trondhjemite and tonalite compositions. Mineralogically, they contain various proportions of quartz, K-feldspar (Or□), plagioclase (An□), biotite, muscovite and calcic amphibole (ferro-pargasite to ferro-hornblende). Most granitic rocks are peraluminous (A/CNK>1.0 and normative corundum>1%) and display moderately fractionated LREE patterns with negative Eu anomalies, despite the fact that HREE enrichment and LREE depletion are occasionally observed. In the primitive mantle-normalized trace-element diagram, they show a significant Nb-depletion similar to those of magmatic rocks from subduction zones. In addition, they plot in the volcanic arc field on the discrimination diagram of Pearce et al. (1984). Overall, these granitic rocks exhibit high-K calc-alkaline to shoshonitic geochemical signatures as commonly observed in I-type granites. However, they usually contain biotites with some compositions similar to A-type granites and are crosscut by abundant late Cretaceous mafic dikes. Combining geologic information from the coastal region of Fujian, late Cretaceous granitic rocks from the offshore islands of Fujian are suggested to represent products from a post-orogenic tectonic environment in the SE China continental margin. Their arc-like geochemical features are interpreted to have been inherited from protoliths formed during previous subduction-related processes. These rocks are considered genetically different from the late. |
本系統中英文摘要資訊取自各篇刊載內容。