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《Earth Science Frontiers》 2001-03
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GEOCHEMICAL TRACING OF THE FLUIDS IN SUBDUCTION ZONES

HUANG De-zhi 1,GAO Jun 2,DAI Ta-geng 1 (1.College of Resource, Environment and Civil Engineering, Central South University, Changsha 410083,China; 2.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029,China)  
There are two kinds of fluids in subduction zones, the aqueous fluid released by dehydration and the melt created by melting. Cycling processes and simultaneous chemical reactions of fluids in subduction zones play an important role in the evolutions of Earth crust and mantle and in the substance exchange. The geochemistry of island-arc volcanics can trace the feature and composition of fluids. High-pressure veins cutting metamorphic rocks in the orogenic belt have recorded the fluid activity directly. The composition and the source of fluids could be traced by the geochemical study on the high-pressure veins and related host rocks. The composition of fluids is related to the depth at which the fluids were released. The aqueous fluids have a considerably high solubility within the depth to a subduction zone (50km). Fluids can migrate in a channel-controlled way on a large scale or in a pervasive penetration way on a limited scale. The source of fluids is external or internal respectively. The quantitative relationships between chemical composition, migration way and substance exchange mechanism of fluids in subduction zones on the one hand and the depth, thermal state and construction of subduction zones on the other will be the important subjects for future studies on the fluids in subduction zone. Southwestern Tianshan Mountains, China, show a very good outcrop of high-pressure veins. Four different types of high-pressure veins can be identified according to the mineral assemblages of veins. Variations in δ 18 O values of omphacites between the different veins is less than 0.9‰. The omphacites at different locations of a vein almost have an equal δ 18 O values(variations in δ 18 O omp ≤0.31‰).Except for one sample,the δ 18 O values of quartz separated from different veins vary between 12‰ and 13.9‰.For a certain host-vein pair, the calculated δ 18 O values of whole-rock of the host rock under the metamorphic temperature of the eclogites in the area using the δ 18 O values of quartz or omphacites of the veins, are almost the same as the analytical values. The authors suggested that, on either a large or microscopic scale, the oxygen isotope exchange between host rocks and the fluids in the ancient subduction zones nearly equilibrated during the formation of the high-pressure veins.The δ 18 O values of the fluids in the subduction zones is about +10.8 ‰.The fluids were released by host rocks-the oceanic basalts which had undergone low temperature alteration by sea water.The results of oxygen isotope of high-pressure veins and host rocks in Tianshan indicate that there were certain amounts of fluids ever released by host rocks at blueschist to eclogite transition, and the movement of the fluids was on a large scale.
【Fund】: 国家自然科学基金资助项目 ( 49972 0 79) ;; 博士后基金资助项目
【CateGory Index】: P594
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