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1
題名:GEOCHEMISTRY OF ANDESITES FROM KUEISHANTAO    
龜山島安山岩之地球化學研究
著者:Mao-Don Chang(章懋棟) ;Ju-Chin Chen(陳汝勤)
出版地區:台灣
出版城市:台北市
學科:地球科學
刊名:Science Reports of the National Taiwan University ACTA Oceanographica Taiwanica
卷期:9期(1979.2)
頁碼:39-49
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

龜山島之斑狀安山岩可分?兩種岩石型,?含橄欖石、兩輝安山岩與含橄欖石、角閃石兩輝安山岩。一般言之,龜山島安山岩在化學上近似於琉球?島之第四紀安山岩,但是前者有較低之三氧化二鋁含量。當和大屯山安山岩作比較時,龜山島安山岩有較低之鋁、鐵、鈣、鉀,但是有較高之鎂、鈉含量與氧化鎂/全量鐵比?。?得注意的是:龜山島安山岩較諸海岸山脈安山岩有較低之鈣、鈉含量與鈉/鉀比?,但有較高之鎂、鉀含量。一般言之,龜山島安山岩所含之銅、鋰、鎳、銣、鋅含量和鉀/銣、鎳/鈷比?與大屯山安山岩相近。然而龜山島安山岩中之鍶含量(平均?144 ppm)?遠低於大屯山安山岩。琉球?島之第四紀安山岩和龜山島安山岩在岩相與化學上近似顯示它們之間應有密切之關係。由龜山島起歷經基隆山、大屯山到彭佳嶼之安山岩中的鍶含量向北遞增;再配以最近之地震資料顯示龜山島安山岩之母岩漿可能源自向北傾斜之班尼奧夫帶上的玄武岩或者與其相同化學成分之榴輝岩的部分熔融。化學成分之規律性變化顯示龜山島安山岩在其母岩漿形成後曾經過固液平衡。
The porphyritic andesites on Kueishantao can be divided into two types i.e. olivine-bearing two pyroxenes andesite and olivine hornblende-bearing two pyroxenes andesite. In general Kueishanato andesites are similar to Ryukyu Islands andesites in chemistry except that the former has slightly lower Al2O3 content. When compared with Tatunshan andesite Kueishantao andesites are lower in Al, Fe, Ca and K but higher in Mg and Na contents and MgO/?FeO ratio. It should be noted that Kueishantao andesites contain lower Ca and Na contents and Na/K ratio but higher Mg and K than Coastal Range andesites. In general Cu, Li, Ni, Rb and Zn contents and K/Rb and Ni/Co ratios of Kueishantao andesites are similar to those of Tatunshan andesites. However the Sr content of Kueishantao andesites (avg 144 ppm) is much lower. The lithologic and chemical similarity between Ryukyu Island andesites and Kueishantao andesites indicate that these andesites may be closely related. The northward increase of Sr from Kueishantao through Keelungshan, Tatunshan to Pengchiahsu together with recent seismic data indicated that Kueishantao andesites may be generated by partial melting of basaltic rock or its eclogitic equivalent at the Benioff zone dipping northward. The smooth trends found in chemical variation diagrams indicate that the andesites may have involved in liquid crystal equilibrium after the formation of the initial liquid.


    

本卷期目次
Science Reports of the National Taiwan University ACTA Oceanographica Taiwanica 9期 (1979.2)
DOWNWARD CONTINUATION OF MAGNETIC FIELD AND THE MAGNETIC ANOMALIES OF OFFSHORE TAIWAN/ Chin-Cheng HuRichard S. Lu
INTESTINE COILING PATTERNS OF CHAETODONTIDS FROM TAIWAN: A PREIMINARY STUDY OF THEIR PHYLOGENIES/ Shih-Chieh ShenChiu Lam
A STUDY ON THE SILICOFLAGELLATES ALONG THE NORTHERN COAST OF TAIWAN/ Rang Huang
臺灣近海平花鰹的資源研究Ⅲ.年齡與成長率/ 黃哲崇張麗鳳楊榮宗
臺灣近海平花鰹的資源研究Ⅳ.形態測定與資源結構的分析/ 王健雄楊榮宗
臺灣西部沿岸之微生物學研究(Ⅱ)海洋酵母?之生理活性/ 鄭玉珍林良平
PRIMARY PRODUCTIVITY AND CHEMICAL NUTRIENTS ALONG THE SOUTHERN COAST OF TAIWAN/ Tsu-Chang HungMay-Chune KoCharley C. H. Tsai
GEOCHEMISTRY OF ANDESITES FROM KUEISHANTAO/ Mao-Don ChangJu-Chin Chen
ON UPWELLING OFF THE PENG-HU ISLANDS/ Kuang-Lung Fan
CLAY MINERALS IN UNCONSOLIDATED AND HIGH PRESSURE CONSOLIDATED SEDIMENTS/ Min-Pen Chen
GENERAL REVIEW OF DEMERSAL FISH RESOURCES AROUND TAIWAN/ Hsi-Chiang LiuChin-Lau Kao
GEOCHEMISTRY OF BASALTS FROM LEG 31 OF THE DEEP SEA DRILLING PROJECT/ Ju-Chin ChenLung-Hui Chen
AGE AND GROWTH OF GOLDEN THREAD, NEMIPTERUS VIRGATUS (HOUTTUYN), FROM THE EAST AND THE SOUTH CHINA SEAS/ Chin-Lau KaoHsi-Chiang Liu
 
   
 
   

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