
Two modes of deep carbon cycling in a big mantle wedge: Differences and effects on Earth's habitability
Shuguang LI, Yang WANG, Sheng’ao LIU
Two modes of deep carbon cycling in a big mantle wedge: Differences and effects on Earth's habitability
In this paper we summarize the evidence for the deep carbon cycling in a big mantle wedge composed of the deeply subducted Western Pacific Plate in the mantle transition zone and the exposed Late Cretaceous and Cenozoic intraplate basalts. We explore the differences in the carbon cycle between the big mantle wedge and island arc systems regarding metasomatic agents, carbonate species, redox reactions and mechanisms of partial melting of carbonated mantle, as well as their effects on maintaining a stable oxygen level in the Phanerozoic atmosphere and on the periodic changes in the greenhouse effect. We point out that quantitative estimate of the proportion of carbon left in the mantle transition zone through reduction of deep subducted carbonates into diamond, and carbon returned to the atmosphere through intraplate basaltic volcanoes, is an important topic for future study.
island arc carbon cycling / intraplate carbon cycling / big mantle wedge / habitable climates
[1] |
|
[2] |
李曙光, 汪洋. 中国东部大地幔楔形成时代和华北克拉通岩石圈减薄新机制: 深部再循环碳的地球动力学效应[J]. 中国科学: 地球科学, 2018, 48(7): 809-824.
|
[3] |
|
[4] |
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
|
[10] |
李曙光. 深部碳循环的Mg同位素示踪[J]. 地学前缘, 2015, 22(5): 143-159.
|
[11] |
|
[12] |
|
[13] |
|
[14] |
|
[15] |
|
[16] |
|
[17] |
|
[18] |
|
[19] |
|
[20] |
|
[21] |
|
[22] |
|
[23] |
|
[24] |
|
[25] |
|
[26] |
|
[27] |
|
[28] |
|
[29] |
|
[30] |
|
[31] |
|
[32] |
|
[33] |
|
[34] |
|
[35] |
|
[36] |
|
[37] |
|
[38] |
|
[39] |
|
[40] |
|
[41] |
|
[42] |
|
[43] |
|
[44] |
|
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|
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