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題名 | An Unusual Late Cenozoic Volcanic Zone in Northern Taiwan Behind the Southern Okinawa Trough=南沖繩海槽後緣--北臺灣晚新生代異常火山帶 |
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作者 | 陳中華; 陳正宏; 馬茲門; 沈君山; | 書刊名 | 中國地質學會會刊 |
卷期 | 42:4 1999.11[民88.11] |
頁次 | 頁593-612 |
分類號 | 351.2192 |
關鍵詞 | 北臺灣火山帶; 琉球火山前緣; 沖繩海槽; 地球化學信號; Northern Taiwan volcanic zone; Ryukyu volcanic front; Okinawa trough; Geochemical signature; |
語文 | 英文(English) |
中文摘要 | 在晚新生代複雜的弧-陸碰撞及海溝-島弧-弧後盆地的大地構造中,臺灣北部及 外海產生一條異常的火山帶。從此火山帶的玄武質岩石的同位素及地球化學的研究,顯示其 岩漿主要俱有似板塊間玄武岩漿的特性,只有部分顯示些許島弧的特性;這些結果並不支持 前人推論北臺灣火山帶,走第四紀琉球島弧火山前緣的西延。因此本文提出北臺灣火山帶另 一種形成的模式, 因弧 - 陸碰撞後在臺灣北部及外海岩石圈產生張裂,造成軟流圈上湧, 經部分熔融所引發的火成活功成為北臺灣火山帶;與一般島弧岩漿成因,明顯不同。 |
英文摘要 | An unusual northern Taiwan Volcanic Zone (NTVZ) represents a very peculiar example of an abnormal tectonic setting within the trench-arc-backarc basin and oblique arc-continent collision environment in late Cenozoic. Isotopic and chemical studies in this paper, show some genetic characteristics of basaltic rocks of NTVZ bearing an evidently intraplate basalt-like (ocean island basalt-like) and a minor arc signature (high field strength elements depletion). These results do not support a previouscon cept that NTVZ belongs to the western extension of the Quaternary Ryukyu Volcanic Front (QRVF). The geographic location of the southern Okinawa Trough further indicates that NTVZ is simply not continuous with QRVF. The submarine topography and some rock dating results also suggest that NTVZ and QRVF are two independent volcanic belts at the western Pacific rim. An alternative model may be that the major source of NTVZ seems to have derived from products of asthenosphere upwelling under a lithospheric exten sional environment after the arc-continent collision in northern Taiwan and relevant offshore area. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。