Molybdenum and boron isotopic evidence for carbon-recycling via carbonate dissolution in subduction zones

2020 ◽  
Vol 278 ◽  
pp. 340-352 ◽  
Author(s):  
Yunying Zhang ◽  
Chao Yuan ◽  
Min Sun ◽  
Jie Li ◽  
Xiaoping Long ◽  
...  
2018 ◽  
Author(s):  
Terry A. Plank ◽  
◽  
Alberto Malinverno ◽  
Alessandro Aiuppa

2021 ◽  
Author(s):  
Minghua Ren ◽  
Shuangshuang Chen ◽  
Hyejeong Lee ◽  
Eugene Smith ◽  
Shichun Huang ◽  
...  

2016 ◽  
Vol 4 (1) ◽  
pp. 111-120 ◽  
Author(s):  
Shu-Guang Li ◽  
Wei Yang ◽  
Shan Ke ◽  
Xunan Meng ◽  
Hengci Tian ◽  
...  

Abstract Although deep carbon recycling plays an important role in the atmospheric CO2 budget and climate changes through geological time, the precise mechanisms remain poorly understood. Since recycled sedimentary carbonate through plate subduction is the main light-δ26Mg reservoir within deep-Earth, Mg isotope variation in mantle-derived melts provides a novel perspective when investigating deep carbon cycling. Here, we show that the Late Cretaceous and Cenozoic continental basalts from 13 regions covering the whole of eastern China have low δ26Mg isotopic compositions, while the Early Cretaceous basalts from the same area and the island arc basalts from circum-Pacific subduction zones have mantle-like or heavy Mg isotopic characteristics. Thus, a large-scale mantle low δ26Mg anomaly in eastern China has been delineated, suggesting the contribution of sedimentary carbonates recycled into the upper mantle, but limited into the lower mantle. This large-scale spatial and temporal variation of Mg isotopes in the mantle places severe constraints on deep carbon recycling via oceanic subduction.


2013 ◽  
Vol 29 ◽  
pp. 32-42 ◽  
Author(s):  
Shikha Sharma ◽  
Andrea Sack ◽  
James P. Adams ◽  
Dorothy J. Vesper ◽  
Rosemary C. Capo ◽  
...  

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