Limiting Effects of UHP Metamorphism on Length Scales of Oxygen, Hydrogen, and Argon Isotope Exchange: An Example from the Qinglongshan UHP Eclogites, Sulu Terrain, China
作者： M. A. Cosca , D. Giorgis , D. Rumble , J. G. Liou
DOI: 10.2747/0020-6814.47.7.716
关键词: Eclogite 、 Geochemistry 、 Lithology 、 Protolith 、 Gneiss 、 Metamorphism 、 Phengite 、 Isotopes of argon 、 Biotite 、 Geology
摘要: New and previously published stable isotope (oxygen hydrogen) 40Ar/39Ar data are compared from selected outcrops of the Sulu UHP terrain near Qinglongshan (Jiangsu Province, China). These rocks exhibit unusually low, heterogeneous δ18O δD values acquired in a Neoproterozoic geothermal system despite undergoing Triassic (220-240 Ma) metamorphism. Incremental heating analyses muscovite, biotite, K-feldspar metagranite, quartzite, gneiss (all metamorphosed to coesite-eclogite facies) yield cooling ages between 190 204 Ma. In contrast, phengite eclogite, contain variable amounts extraneous argon, consistent with inheritance protolith. Plots comparing δ18O, δD, total gas different lithologies within individual only meters apart highlight significant inter-outcrop isotopic heterogeneities (ΔDphengite = 26‰; Δ18Ophengite 8.8‰; Δ40Ar/39Arphen...
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