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題名 | The Geochemical Characteristics of the Metamorphosed Andesite/Dacite from the Tananao Schist Complex in the Tungao area, Taiwan=臺灣東澳地區大南澳雜岩中變質安山岩/ 石英安山岩之地球化學特徵 |
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作者 | 俞震甫; 吳才煒; | 書刊名 | 中國地質學會會刊 |
卷期 | 34:2 1991.04[民80.04] |
頁次 | 頁147-162 |
分類號 | 358.36 |
關鍵詞 | 大南澳; 石英; 地球化學; 安山岩; 東澳; 臺灣; 雜岩; 變質; |
語文 | 英文(English) |
中文摘要 | 本研究分析了臺灣東澳地區大南澳雜岩中變質安山岩╱石英安山岩之化學及氧同位素組成。高鈉含量(6.28至10.57 %)及氧同位素組成(+9.9 至14.3 o/oo)指示了這些變質火山岩曾歷經低溫蝕變/變質(角斑岩化)作用。LREE及HFSE間之同步變化暗示這些元素在蝕變╱變質作用中可能較為“穩定(不遷移)”。變質安山岩具有較低的鈉含量及氧同位素組成,可能僅歷經了較低程度的蝕變/變質作用;其“不遷移”元素組成之特徵與現今海洋島弧,中鉀含量,鈣鹼系列安山岩者類似。東澳地區亦有二角閃岩體之出現,其化學及同位素組成與現今海洋島弧,中鉀含量,拉斑玄武岩系者相當。角閃岩體具有較低之氧同位素組成(+3.2至+7.4 o/oo),指示了其原岩曾歷經高溫之海水-岩石交互作用。不論此角閃岩體與本文討論之變質安山岩/石英安山岩是否有成因上之關連,二者分別代表了古海洋島弧深、淺不同的部份。 |
英文摘要 | Metamorphosed andesites/dacites from the Tananao Schist Complex in the Tungao area, northeastern Taiwan were collected and analyzed for their major-and trace-element, as well as oxygen-isotope compositions. The results show that all samples are high in Na�烙 content (from 6.28 to 10.57%) and δ�XO value (form +9.9 to +14.3 o/oo, attesting that these metamorphosed volcanics have been subjected to low-temperature alteration/metamorphism (i.e., keratophyrization). The coherent variations between LREE (light rare earth element) and HFSE (high field strength element) among samples, however, indicate that these elements may have been immobile during alteration /metamorphism. Two metamorphosed andesites, with lower Na�烙 content and δ�XO value, are suggested to be least altered among all samples studied. The immobile-element compositions of these two samples share similar chemical characteristics with those of the modern oceanic island-arc medium-K calcalkaline andesites. There are two amphibolite bodies, occuring south of the metamorphosed andesite/dacite, in the Tungao area. Their chemical and isotopic characteristics have been reported to be similar to those of the modern oceanic island-arc medium-K tholeiite (Weber-Diefenbach et al., 1980; Yui et al., 1990). The low δ�XO values (from +3.2 to +7.4o/oo) of these amohibolites (Chu and Shieh, 1981) indicate that their protoliths may have experienced high-temperature seawater-rock interaction. Whether the amphibolite and the metamorphosed andesite/dacite are genetically related or not, they repesent relics of different depth levels of an ancient oveanic island arc(s). |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。