[2018] Scientists reveal the links between deep carbon cycle and geodynamics of big mantle wedge—-Science China Earth Sciences

Summary: The formation age of the big mantle wedge beneath eastern Asia and the lithospheric thinning mechanism of the North China craton are two key scientific issues. Based on new findings of deep carbon cycle, a recent study suggests that the big mantle wedge beneath eastern Asia was formed 125 Ma, and interaction between the CO2-rich silicate melt produced in the big mantle wedge and lithospheric mantle results in lithospheric thinning of the North China craton.

Contact: Prof. Shuguang LiContinue reading

[2017] A store of subducted carbon beneath Eastern China—-Natl Sci Rev.

Geochemists’ toolkit for tracing the global deep carbon cycle has recently been augmented by the analysis of magnesium isotopes. Light Mg-isotopic compositions normally occur uniquely in carbonates precipitated from seawater, either in the form of sedimentary limestones/dolomites or as sea-water-precipitated alteration products impregnating the oceanic crust. But Chinese geochemists have found that large numbers of volcanic rocks from the eastern part of China also contain the tell-tale signature of marine carbonates, indicating that these have been recycled through the upper mantle and into the sources of the volcanic rocks. Li and co-authors have reviewed the available data, adding many new analyses, in order to map the regional distribution of these anomalous Mg-isotopic compositions [1]. Continue reading