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題名 | Stable-Isotope Studies of Amphibolite in the Tungao Area, Northeastern Taiwan=臺灣東北部東澳地區角閃岩之穩定同位素研究 |
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作者 | 俞震甫; Yui, Tzen-fu; |
期刊 | 中國地質學會會刊 |
出版日期 | 19991100 |
卷期 | 42:4 1999.11[民88.11] |
頁次 | 頁543-557 |
分類號 | 358.2 |
語文 | eng |
關鍵詞 | 穩定同位素; 角閃岩; 臺灣; Stable isotope; Amphibolite; Taiwan; |
中文摘要 | 本研究分析了東澳地區角閃岩之穩定同住素組成,以了解這些角閃岩曾經歷之水 - 岩交互作用的歷史。 角閃岩之氧同住素組成為 +2.8 至 +5.2,較正常之玄武岩質岩石 ( δ�X O= +5.7 ± 0.3) 為低, 可能為此角閃岩之原岩在上陸前歷經高溫海水蝕變作用的結 果。 角閃岩中角閃石之氧同住素組成為 +2.0 至 +4.0, 共存斜長石之氧同位素組成為 + 3.6 至 +7.7,這些資料顯示氧同位素組成在共存之角閃石與斜長石間並不平衡, 此可能肇 因於在角閃岩相變質作用後之降級變質作用中, 角閃石 / 斜長石與共存變質溶液間同位素 交換速率之差異。這些角閃岩之低氧同位素組成亦指示了:(1) 在變質作用中角閃岩對變質 溶液為一較不透水居,或 (2) 在變質作用中角閃岩內之水 / 岩比例較低。在花岡岩中之角 閃擄獲岩其氧同位素組成較高,自 +9.1 至 +10.4,明顯的,這些角閃擄獲岩與其田岩 (花 岡岩 ) 曾發生同位素交換或換質作用。 脈石英之氣同位素組成為 +6.5 至 +12.8,由共存 石英與金紅石問軋同位素組成分化之估計, 低δ�X O 值之脈石英可能形成於降級變質作用 中,其溫度條件為 505-549 ℃。高δ�X O 值之脈石英則可能形成於更低之溫度條件,或者 ,此類 (高δ�X O 值 ) 脈石英之生成與花岡岩之侵入有關。 |
英文摘要 | Stable-isotope studies were carried out for the amphibolites of the Tananao Metamorphic Complex in the Tungao area, northeastern Taiwan to understand their possible water-rock interaction history. The δ�X values of the amphibolites range from +2.8 to +5.2%o, which are lower than those of the normal basaltic rocks (i.e., δ�X O= +5.7 ± 0.3%o). The low- �X O compositions most probably resulted from high-temperature seawater-rock interaction before the protoliths were accreted to the continental margin. The δ�X O values of the amphibole separates range from +2,0 to +4.0%o,whereas those of the coexisting plagioclases from +3.6 to +7.7%o.The steep slope of the data array in the δ - δ plot demonstratesthat the two minerals were not in isotopic equilibrium, which isthought as a result of differential retrograde isotope exchangebetween amphibole/plagioclase and the ambient metamorphic fluidafter the amphibolite facies metamorphism. The low δ�X O valuesalso indicate that the amphibolites would be relativelyimpermeable to metamorphic fluid or that water/rock ratios inthe amphibolites were low during the amphibolite faciesmetamorphism. The amphibolite xenoliths in the nearby Yuantoushan graniticintrusive have high 8@0 values, i.e., +9.1 to +10.4%o. Theyobviously have isotopically exchanged with or have been assimilated by the granitic rocks. The δ�X O values of vein quartz in the amphibolites rangefrom +6.5 to +12.8%e. Based on isotopic fractionation between coexisting quartz and rutile, those quartzs with low 8"0 values (i.e., < +7.7%o) might have been formed under retrogradetemperatures of 505 ° - 549℃, while those with high δ�X O values(i.e., > +10.0%o) might have been formed at lower temperatures or related genetically to the nearby granitic intrusives. |
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