Preprints
https://doi.org/10.5194/egusphere-2022-1169
https://doi.org/10.5194/egusphere-2022-1169
09 Mar 2023
 | 09 Mar 2023

Tracing subducted oceanic slabs in the mantle by using molybdenum isotopes: A case study of intraplate basalts from the Northeast China

Qiugen Zheng, Qifang Zheng, Yi Zhang, Guangyu He, Qian Wang, and Jane Fitton

Abstract. Determining subducted processes is very important for understanding lithological heterogeneity because Substantial quantities of slabs are recycled into the mantle. Molybdenum isotope have been used to distinguish the addition of crustal materials since the significant Mo isotopic differences of reservoirs. Here we undertake a systematic Mo isotopic investigation on a suite of well-characterized continental basalts from Keluo and Halaha-Chaoer, located at Northeast China. The δ98Mo varied from -0.41 to -0.23 ‰ with an average of -0.34 ‰ for Keluo samples and from -0.18 to -0.12 ‰ with an average of -0.15 ‰. The former is lighter than fresh oceanic basalts (-0.21 ‰) while the latter is similar to oceanic basalts. The Mo isotopic variations, combine with other geochemical indications (LOI, Ce/Pb, La/Yb and so on), cannot be interrupted to chemical weathering, continental crust contamination or partial melting, but are explained by the addition of various oceanic crustal materials in magma sources. The relationships between δ98Mo and Ba/Th, Th/U, 143Nd/144Nd for the samples suggest sediment, fresh and altered oceanic crust have contributed to the large variations in these samples. The study here indicates the great potential of Mo isotopes to distinguish different types of recycled oceanic crust materials in the mantle.

Qiugen Zheng, Qifang Zheng, Yi Zhang, Guangyu He, Qian Wang, and Jane Fitton

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1169', Qasid Ahmad, 10 May 2023
  • RC2: 'Comment on egusphere-2022-1169', Oliver Nebel, 27 Jun 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1169', Qasid Ahmad, 10 May 2023
  • RC2: 'Comment on egusphere-2022-1169', Oliver Nebel, 27 Jun 2023
Qiugen Zheng, Qifang Zheng, Yi Zhang, Guangyu He, Qian Wang, and Jane Fitton
Qiugen Zheng, Qifang Zheng, Yi Zhang, Guangyu He, Qian Wang, and Jane Fitton

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This paper undertakes a systematic Mo isotopic investigation on a suite of well-characterized continental basalts from Keluo and Halaha-Chaoer, located in Northeast China. The relationships between δ98Mo and Ba/Th, Th/U, 143Nd/144Nd for the samples suggest sediment and altered oceanic crust have contributed to the significant variations in these samples. The study here indicates the great potential of Mo isotopes to distinguish different types of recycled oceanic crust materials in the mantle.