https://scholars.lib.ntu.edu.tw/handle/123456789/335283
標題: | Stable isotope characteristics of eclogites from the ultra-high-pressure metamorphic terrain, east-central China | 作者: | Yui, Tzen-Fu CHING-HUA LO Douglas Rumble III Chen, Chen-Hong Lo, Ching-Hua |
關鍵字: | China; Stable isotope: Eclogite; Ultra-high-pressure metamorphism | 公開日期: | 五月-1997 | 卷: | 137 | 期: | 1-2 | 起(迄)頁: | 135--147 | 來源出版物: | Chemical Geology | 摘要: | A stable isotope study was made for the ultra-high-pressure (UHP) metamorphic rocks in the Dabie and Sulu terrains, east-central China. δ18O values of minerals in eclogites cover a wide range, from -4 to +6‰. The O-isotope fractionations between minerals (i.e. omphacite, phengite and/or amphibole) and garnet in eclogites are mostly not in isotopic equilibrium. The large range of O-isotope composition of garnet may approximate the δ18O variations of eclogites during UHP metamorphism and must have been largely inherited from their pre-subduction basaltic precursors which might have interacted with meteoric waters under variable temperature conditions and water/rock ratios before UHP metamorphism. The O-isotope disequilibrium between minerals and garnet in eclogites was caused by retrograde hydration reactions. The fluids required for these hydration reactions must have low or even negative O-isotope compositions. It is postulated that such fluids were either originated from meteoric deep-infiltration or were derived from low-δ18O (para)gneisses. |
URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/335283 https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030930463&doi=10.1016%2fS0009-2541%2896%2900153-2&partnerID=40&md5=30e20b4b94ae069ea2a6942d33299435 |
DOI: | 10.1016/s0009-2541(96)00153-2 |
顯示於: | 地質科學系 |
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