Journal ArticleDOI
Post-metamorphic low delta 13 C calcite in the Cycladic Complex (Greece) and their implications for modeling fluid infiltration processes using carbon isotope compositions
Reads0
Chats0
TLDR
In this article, the authors show that calcite veins and overgrowths with δ 13 C values of -12 ‰ to -8 ‰ and δ 18 O values of 24 � to 27 ‰ are characteristic features of the Cyclades metamorphic complex of Greece.Abstract:
Calcite veins and overgrowths with δ 13 C values of -12 ‰ to -8 ‰ and δ 18 O values of 24 ‰ to 27 ‰ are shown to be characteristic features of the Cyclades metamorphic complex of Greece. Field and petrographic characteristics and the marked carbon and oxygen isotope disequilibrium that the veins and overgrowths show with host metamorphic rocks indicate that they developed during post-metamorphic evolution of the complex. The low δ 13 C values are interpreted to be either the result of the oxidation of organic carbon or solution of soil CO 2 by surface waters moving downwards along extensional fractures generated during the late stages of exhumation. Carbon and oxygen isotopic compositions reported for the carbonate fraction of many pelitic schists on Naxos overlap with the range of these late carbonates and may in part reflect a contribution of this late calcite. Uncertainties regarding the origin of low δ 13 C values in the carbonates of metamorphic rocks shows that they must be used with caution as tracers of fluid-rock exchangeread more
Citations
More filters
Journal ArticleDOI
Calculation of oxygen isotope fractionation in magmatic rocks
Zi-Fu Zhao,Yong-Fei Zheng +1 more
TL;DR: In this article, the increment method is applied to calculation of oxygen isotope fractionation factors for common magmatic rocks, which can be used to quantitatively determine the history of water-rock interaction and to serve geological thermometry for various types of Magmatic rocks.
Journal ArticleDOI
High-pressure veins in eclogite from New Caledonia and their significance for fluid migration in subduction zones
Carl Spandler,Joerg Hermann +1 more
TL;DR: In this article, the petrology and geochemistry of high pressure veins and associated metasomatic selvages that are hosted by eclogite in the Pouebo Eclogites Melange of northern New Caledonia are described.
Journal ArticleDOI
Fluid processes during the exhumation of high-P metamorphic belts
TL;DR: Fluid-related features related to exhumation have been found to contribute to density changes and the initiation of partial melting during decompression, as well as the development of extensive vein systems as mentioned in this paper.
Journal ArticleDOI
An O-isotope profile through the HP-LT Corsican ophiolite, France and its implications for fluid flow during subduction
TL;DR: In this article, stable isotope geochemistry of the Corsican ophiolite, which is variably affected by subduction-related metamorphism, was investigated to assess the impact of subduction zone fluid flow on the downgoing slab.
Journal ArticleDOI
Evolution of hydrothermal regime along a crustal shear zone, Tinos Island, Greece
TL;DR: In this article, structural cathodoluminescence and SIMS δ18O analyses of quartz-calcite veins are combined to constrain the evolution in space and time of fluid infiltration in an exhuming detachment shear zone (Tinos Island, Cyclades, Greece).