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1
題名:An Experimental Petrological Study at Atmospheric Pressure of the Two-pyroxene Andesite of the Kuanyinshan area, Northern Taiwan    
台灣北部觀音山兩輝安山岩-大氣壓下之實驗岩石學研究
著者:Teh-Ching Liu(劉德慶) ;Jan-Jee Pan(潘建熾) ;Bore-Sing Chen(陳博信) ;Chen-Hong Chen(陳正宏)
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:安山岩 ; 觀音山 ; 結晶分化 ; 岩漿 ; andesite ; Kuanyinshan ; fractional crystallization ; magma
刊名:ACTA Oceanographica Taiwanica
卷期:35卷4期(1996.12)
頁碼:409-422
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

本研究係採用高溫爐,對台灣北部觀音山地區之兩輝安山岩做一大氣壓下之高溫實驗,以便了解其斑晶結晶之先後次序,從殘餘岩之成份分析,更能瞭解岩漿結晶分化之趨勢。 研究對象為採自下牛寮之兩輝安山岩,灰色、中細粒、有細小氣孔、斑晶有斜長石(最大約1mm),普通輝石(約5mm左右)和紫蘇輝石。經磨成細粉後,用白金箔包裹,放入高溫爐做高溫實驗,溫度範圍涵蓋1233℃至1022℃,間隔自3℃至104℃不等,實驗時間自數小時至十小時,溫度愈低,所須反應時間愈長。溫度之測量係採用R型之熱電偶。實驗結果經製成光片後,用反向光鑑定,然後再用電子微探針分析。 實驗結果顯示,此兩輝安山岩之液相溫度為1230℃,固相溫度接近1000℃,熔融區間約為230℃。液相礦物為鈦鐵氧化物和斜長石,斜輝石和直輝石在1167℃同時出現,其後,石英在1155℃時晶出,最後,磷灰石在1114℃時結晶。以岩漿結晶分化趨勢而言,兩輝安山岩質岩漿歷經鈦鐵氧化物、斜長石、兩輝石、石英和磷石之結晶過程,殘餘岩漿之矽和鉀含量愈近末期愈高,鐵和鎂含量則愈來愈低,鋁、鈣和鈉在早期變化不大,中期以後即變低,而鈦含量則是前半期降低,後半期升高。此安山岩質漿結晶分化後之末期岩漿近似花崗岩質岩漿。
The two-pyroxene andesite from Kuanyinshan, northern Taiwan, was studied with a high temperature furnace at atmospheric pressure. The purposes of this study were to investigate the crystallization sequence of the phenocrysts, to analyze their chemical compositions and to estimate the evolution trends of the magma. The two-pyroxene andesite was collected at Shianiuliao. It is grayish, fine to medium grained and with small vesicles. The phenocrysts are plagioclase (up to 1 mm in diameter), augite (up to 5 mm in diameter) and hypersthene. The rock powder was loaded into platinum envelopes and suspended in a 1-atm vertical-quenching furnace. It was quenched into water after the run. The temperature ranged from 1233℃ to 1002℃, and the duration time was from three hours to ten hours. The run products were made as polished sections. Phases were first identified by a reflected-light microscopy. The compositions of the glasses and phenocrysts were analyzed with an electron microprobe. The experimental results show that the liquidus temperature is located at 1230℃, while the solidus temperature is estimated to be close to 1000℃. The melting interval is about 230℃. The liquidus minerals are iron-titanian oxide and plagioclase The following phases are clinopyroxene and orthopyroxene at about 1167℃. Quartz appears at 1155℃. At 1114℃, apatite finally crystallizes. The evolution of the andesitic magma shows the chemical trend as : enrichment in SiO2 and K2O; depletion in total FeO and MgO; little variation in the beginning but a decrease in the end for Al2O3, CaO and Na2O; depletion in TiO2 in the early stages and enrichment in TiO2 in the later stages. The andesitic magma can produce dacitic and granitic magmas through the fractional crystallization mechanism.


    

本卷期目次
ACTA Oceanographica Taiwanica 35卷4期 (1996.12)
Coherent Vortical Structure in a Sheared Turbulence Beneath the Air-Sea Interface/ Wu-Ting Tsai
剩餘生產量模式應用於資源評估之檢討/ 王健雄
Thermophilic Sulfate Reducers Present In Production Waters from North Sea Oil Field/ J-Y Leu
An Experimental Petrological Study at Atmospheric Pressure of the Two-pyroxene Andesite of the Kuanyinshan area, Northern Taiwan/ Teh-Ching LiuJan-Jee PanBore-Sing ChenChen-Hong Chen
On the Disconnection and Reconnection Mechanisms of Vortex Filaments Approaching the Air-Sea Interface/ Wu-Ting Tsai
利用化學螢光法測量表層海水中低濃度之硝酸鹽/ 江東山龔國慶劉康克
台灣東北方黑潮的線型不穩定性/ 李?運
 
   
 
   

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