Yui, Tzen-FuTzen-FuYuiCHING-HUA LODouglas Rumble IIIChen, Chen-HongChen-HongChenLo, Ching-HuaChing-HuaLo2018-09-102018-09-101997-05http://scholars.lib.ntu.edu.tw/handle/123456789/335283https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030930463&doi=10.1016%2fS0009-2541%2896%2900153-2&partnerID=40&md5=30e20b4b94ae069ea2a6942d33299435A 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.application/pdfapplication/pdfChina; Stable isotope: Eclogite; Ultra-high-pressure metamorphism[SDGs]SDG14journal article10.1016/s0009-2541(96)00153-22-s2.0-0030930463WOS:A1997WU74900010