Tracing carbonate–silicate interaction during subduction using magnesium and oxygen isotopes

Shui-Jiong Wang (), Fang-Zhen Teng () and Shu-Guang Li
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Shui-Jiong Wang: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences
Fang-Zhen Teng: Isotope Laboratory, University of Washington
Shu-Guang Li: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Subduction of carbonates and carbonated eclogites into the mantle plays an important role in transporting carbon into deep Earth. However, to what degree isotopic exchanges occur between carbonate and silicate during subduction remains unclear. Here we report Mg and O isotopic compositions for ultrahigh pressure metamorphic marbles and enclosed carbonated eclogites from China. These marbles include both calcite- and dolomite-rich examples and display similar O but distinct Mg isotopic signatures to their protoliths. Their δ26Mg values vary from −2.508 to −0.531‰, and negatively correlate with MgO/CaO ratios, unforeseen in sedimentary carbonates. Carbonated eclogites have extremely heavy δ18O (up to +21.1‰) and light δ26Mg values (down to −1.928‰ in garnet and −0.980‰ in pyroxene) compared with their protoliths. These unique Mg–O isotopic characteristics reflect differential isotopic exchange between eclogites and carbonates during subduction, making coupled Mg and O isotopic studies potential tools for tracing deep carbon recycling.

Date: 2014
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DOI: 10.1038/ncomms6328

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