Carbon and helium isotope systematics of North Fiji Basin basalt glasses: carbon geochemical cycle in the subduction zone

1998 ◽  
Vol 154 (1-4) ◽  
pp. 127-138 ◽  
Author(s):  
Yoshiro Nishio ◽  
Sho Sasaki ◽  
Toshitaka Gamo ◽  
Hajime Hiyagon ◽  
Yuji Sano
2013 ◽  
Vol 371-372 ◽  
pp. 235-251 ◽  
Author(s):  
Sebastian Tappe ◽  
D. Graham Pearson ◽  
Bruce A. Kjarsgaard ◽  
Geoff Nowell ◽  
David Dowall

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Stefan Farsang ◽  
Marion Louvel ◽  
Chaoshuai Zhao ◽  
Mohamed Mezouar ◽  
Angelika D. Rosa ◽  
...  

AbstractEarth’s deep carbon cycle affects atmospheric CO2, climate, and habitability. Owing to the extreme solubility of CaCO3, aqueous fluids released from the subducting slab could extract all carbon from the slab. However, recycling efficiency is estimated at only around 40%. Data from carbonate inclusions, petrology, and Mg isotope systematics indicate Ca2+ in carbonates is replaced by Mg2+ and other cations during subduction. Here we determined the solubility of dolomite [CaMg(CO3)2] and rhodochrosite (MnCO3), and put an upper limit on that of magnesite (MgCO3) under subduction zone conditions. Solubility decreases at least two orders of magnitude as carbonates become Mg-rich. This decreased solubility, coupled with heterogeneity of carbon and water subduction, may explain discrepancies in carbon recycling estimates. Over a range of slab settings, we find aqueous dissolution responsible for mobilizing 10 to 92% of slab carbon. Globally, aqueous fluids mobilise $${35}_{-17}^{+20}$$ 35 − 17 + 20 % ($${27}_{-13}^{+16}$$ 27 − 13 + 16 Mt/yr) of subducted carbon from subducting slabs.


Nature ◽  
1995 ◽  
Vol 373 (6512) ◽  
pp. 330-333 ◽  
Author(s):  
D. R. Hilton ◽  
J. Barling ◽  
G. E. Wheller

2015 ◽  
Vol 417 ◽  
pp. 163-172 ◽  
Author(s):  
Cécile Gautheron ◽  
Manuel Moreira ◽  
Chloé Gerin ◽  
Laurent Tassan-Got ◽  
Antoine Bezos ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document