期刊论文

Yang, Wei;Li, Shu-Guang

英文

Geochimica et Cosmochimica Acta

0016-7037

2018

240

191-219

10.1016/j.gca.2018.08.032

The authors would like to thank editorial handling by Dr. Shi-Chun Huang and insightful comments from three anonymous reviewers who greatly improved the original manuscript. We also thank Yan-Hong Liu, Bing-Yu Gao, Wei-Yi Li, Hong-Yan Li and Wen-Jun Li for their assistance with the major and trace elements and Sr-Nd-Pb isotopic analyses at IGGCAS, Xu-Nan Meng, Rui-Ying Li, Yan Xiao and Ting Gao for assistances in Mg isotopic analyses at CUGB. We also thank Hitesh Changela for carefully polishing the English writing on the manuscript. This work was supported by the National Natural Science Foundation of China (41730214, 41322022), “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant No. XDB18030603), Youth Innovation Promotion Association, Chinese Academy of Sciences (No. 2014056), National Postdoctoral Program for Innovative Talents (BX201700237) to Heng-Ci Tian and the Ministry of Science and Technology of People's Republic of China (2016YFE0203000).

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Oceanic subduction zones are important channels for carbon exchange between the Earth's crust and mantle. However, the nature of carbon cycles at depths from 120 to 410 km in the subduction zone remains unknown. To decipher this issue, high-precision stable Mg isotopes of arc-like volcanic rocks from Tengchong, Southwestern China, have been investigated. The Tengchong volcanic rocks comprise basalts and andesites, with Mg0 content varying from 2.41 to 8.48 wt.%. Both the basalts and andesites exhibit homogeneous and light Mg isotopic compositions with delta Mg-26 ranging from -0.51 to -0.45 pa...