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A water-rich zone crossing the 660 km discontinuity beneath the SE Tibetan Plateau revealed by one-dimensional electrical conductivity modelling
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A water-rich zone crossing the 660 km discontinuity beneath the SE Tibetan Plateau revealed by one-dimensional electrical conductivity modelling
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Journal Article
A water-rich zone crossing the 660 km discontinuity beneath the SE Tibetan Plateau revealed by one-dimensional electrical conductivity modelling
2025
Overview
Water plays a key role in the circulation of mantle material within the Earth. Recent research has shown that water could be transported into the lower mantle by high-angle subduction, such as beneath the SE Tibetan Plateau, where the Indian (Tethys) plate has undergone long-term high-angle subduction. However, due to the scarcity of geophysical observations, it remains uncertain whether the plate can carry water into the deep mantle. Here, we report three one-dimensional conductivity models of the mantle inverted from C-responses from geomagnetic depth sounding (GDS) data in the area. The electrical conductivity of the lower mantle transition zone (LMTZ) and uppermost lower mantle (ULM) beneath the Xichang (XIC) station is higher than the 1-D global mean mantle conductivity derived from the inversion of satellite-measured geomagnetic data, while beneath the Chengdu (CDU) and Chongqing (CHQ) stations, it is lower than the global mean. Together with the results of seismic imaging and experimental models of minerals at high temperatures and pressures, the high-conductivity in the XIC model can be explained by water contents of 3.06–3.15 wt.% in the LMTZ and 0.28–0.51 wt.% in the ULM. The conductivity models confirm that the subducting Tethys oceanic slab carried water into the LMTZ and ULM beneath the XIC.
Graphical Abstract
Publisher
Springer Berlin Heidelberg,Springer,Springer Nature B.V,SpringerOpen
Subject
