Marin-Ceron, M. I. et al. (2009) Slab decarbonation and CO<sub>2</sub> recycling in the Southwestern Colombian volcanic arc, Geochim. Cosmochim. Acta, 74, 1104-1121, doi: 10.1016/j.gca.2009.10.031. < 20100403102548447.admin > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    The contribution of subducted carbonate sediments to the genesis of the Southwestern Colombian arc magmas was investigated using a comprehensive petrography and geochemical analysis, including determination of major and trace element contents and Sr, Nd, Hf and Pb isotope compositions. These data have been used to constrain the depth of decarbonation in the subducted slab, indicating that the decarbonation process continues into the sub-arc region, and ultimately becomes negligible in the rear arc. We propose on the basis of multi-isotope approach and mass balance calculations, that the most important mechanism to induce the slab decarbonation is the infiltration of chemically reactive aqueous fluids from the altered oceanic crust, which decreasingly metasomatize the mantle wedge, triggering the formation of isotopically different primary magmas from the volcanic front (VF) with relatively high 176Hf/177Hf, high 87Sr/86Sr, negative values of εNd and lower Pb isotopes compared to the rear arc (RA). The presence of more aqueous fluids at the volcanic front may increase the degree of decarbonation into carbonate-bearing lithologies. Moreover, with increasing pressure and temperature in the subduction system, the decrease in dehydration of the slab, leads to cessation of fluid-induced decarbonation reactions at the rear arc. This development allows the remaining carbonate materials to be recycled into the deep mantle.

  • summary:

    One of the most important implications of this study in the deep carbon-cycle is that even if some amount of carbonate-rich sediments are removed at the fore-arc and sub-arc regions, carbonate-rich sediments can potentially deliver carbon to the mantle via subducted carbonate eclogite. If the subducted slab is recycled into the sources of ocean-island basalts (OIB), the presence of residual carbonate which have a relatively high 176Hf/177Hf ratio may also be recycled (Chauvel et al., 2008) and it may explain the isotopic signatures found in some Hawaiian basalts (Blichert-Toft et al., 1999) and may contribute to the C-fluxes estimated for OIB (Marty and Tolstikhin, 1998).

  • doi: 10.1016/j.gca.2009.10.031
  • modified at 12 h ago


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs
(c) Q-ICP-MS_procedures of Lu et al. (2007) on Q-ICPMS Agilent 7500cs
(d) Pb isotopes_procedures of Kuritani and Nakamura (2002, 2003) on TIMS Finnigan MAT261, MAT262 and Triton TI
(e) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Finnigan MAT261, MAT262 and Triton TI
(f) Nd isotopes_procedures of Nakamura et al. (1991, 2003) on TIMS Finnigan MAT261, MAT262 and Triton TI
(g) Hf isotopes_procedures of Lu et al. (2007) on MC-ICP-MS Finnigan, Neptune
Img 9016@4184e1dfb724a45acaea3fb thumb AZ 07 < 20130704085247-196969 >pub
  • IGSN: IEDRM00EA
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.09
  • modified at 2019-05-08
Img 9011@4344a53236d2b2c7fad2ff6 thumb AZ 09 < 20130704085146-966834 >pub
  • IGSN: IEDRM00EB
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.3
  • modified at 2019-05-08
Img 9012@cd22dc0d73b7abd6a5a3b3c thumb DJ 11 < 20130704085159-319650 >pub
  • IGSN: IEDRM00EM
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.57
  • modified at 2019-05-08
Img 9007@9014f20fc50353ab6f55649 thumb AZ 08 < 20130704085021-800658 >pub
  • IGSN: IEDRM00EC
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.075
  • modified at 2019-05-08
Img 9013@95af99f7cc93c924427dad5 thumb AZ 308 < 20130704085211-786981 >pub
  • IGSN: IEDRM00EF
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.545
  • modified at 2019-05-08
Img 9014@582aaf52f28d088748eae23 thumb GAL 04 < 20130704085222-220297 >pub
  • IGSN: IEDRM00EI
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 1.63
  • modified at 2019-05-08
Img 9015@0aea4ef9ba80c3a2a6e8f59 thumb T 01 < 20130704085234-380837 >pub
  • IGSN: IEDRM00ER
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.12
  • modified at 2019-05-08
Img 9045@a67708f1ae59b0a6e547e30 thumb AZ-10 < 20130705085751-932406 >pub
  • IGSN: IEDRM00ED
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.045
  • modified at 2019-05-08
Img 9050@a67c054fec8448352c5c898 thumb DJ-01 < 20130705085848-637002 >pub
  • IGSN: IEDRM00EJ
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.215
  • modified at 2019-05-08
Img 9052@b195a10dfea754d8f09845d thumb DJ-12 < 20130705085910-231516 >pub
  • IGSN: IEDRM00EN
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.245
  • modified at 2019-05-08
Img 9047@ce54fc99a72bc0b0afc24c7 thumb PPU-01 < 20130705085814-084920 >pub
  • IGSN: IEDRM00EP
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.23
  • modified at 2019-05-08
Img 9049@ad10f0b9e57a8de7aca1b32 thumb DJ-14 < 20130705085836-464064 >pub
  • IGSN: IEDRM00EO
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.185
  • modified at 2019-05-08
Img 9043@f6ebe4c5b5461af6470bab6 thumb Sha-03 < 20130705085728-539886 >pub
  • IGSN: IEDRM00EQ
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.125
  • modified at 2019-05-08
Img 9051@849f614e11c55f8fa230eb3 thumb T-05 < 20130705085859-853543 >pub
  • IGSN: IEDRM00ES
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.495
  • modified at 2019-05-08
Img 8970@2839b3781b42cd665eaf5e6 thumb DJ 09 < 20130703084753-860666 >pub
  • IGSN: IEDRM00EK
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.745
  • modified at 2019-05-08
Img 8962@f07a45589213e4458ef3997 thumb DJ 10 < 20130703084704-267685 >pub
  • IGSN: IEDRM00EL
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 2.095
  • modified at 2019-05-08
Img 8969@67283535c6e6d1ae6164002 thumb GAL 01 < 20130703084746-299628 >pub
  • IGSN: IEDRM00EG
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 3.055
  • modified at 2019-05-08
Img 8967@843c49978e2d53a93e796b4 thumb GAL 02 < 20130703084739-484202 >pub
  • IGSN: IEDRM00EH
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 2.165
  • modified at 2019-05-08
Img 8971@23f86da8357249da2abc98a thumb AZ 76 < 20130703084801-254848 >pub
  • IGSN: IEDRM00EE
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.55
  • description: Moved_from: 20130703083857-766848 on 2015-10-13
  • modified at 2019-05-08
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PPU-01 pub TIMS Finnigan MAT261, MAT262 and Triton TI 2 20180910093753-824006
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AZ-08 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20180910093814-365034
AZ-08 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20180910094127-210629
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AZ-308 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20180910093814-681526
AZ-308 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20180910094127-362381
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GAL-1 pub XRF PANalytical PW2400 14 20180914093608-480548
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DJ-14 pub TIMS Finnigan MAT261, MAT262 and Triton TI 2 20180910093753-796010
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DJ-14 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20180910094128-215438
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AZ-76 pub XRF PANalytical PW2400 14 20180914093607-435152
AZ-76 pub MC-ICP-MS Finnigan, Neptune 2 20180910091619-789845
AZ-76 pub Q-ICPMS Agilent 7500cs 24 20180910092948-222000
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AZ-76 pub TIMS Finnigan MAT261, MAT262 and Triton TI 2 20180910093753-794590
AZ-76 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20180910093814-795254
AZ-76 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20180910094127-602487
name spots global-id
caption ID assembly stone
Table 1: Major elements, trace elements and isotopic compositions from SW Colombian volcanic arc pub 20180910141023-335550 major-trace-isotope (Maria Marin-Ceron et al., 2010) 19
manual
  • name
  • Marin-Ceron, M. I.
  • Moriguti, Takuya
  • Makishima, Akio
  • Nakamura, E.