DOI: 10.1038/ngeo2143
论文题名: Carbon dioxide released from subduction zones by fluid-mediated reactions
作者: Ague J.J. ; Nicolescu S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 5 起始页码: 355
结束页码: 360
语种: 英语
Scopus关键词: carbon cycle
; carbon dioxide
; carbonate rock
; degassing
; Eocene
; infiltration
; island
; island arc
; metamorphic rock
; subduction zone
; Aegean Islands
; Cyclades
; Greece
; Southern Aegean
; Syros
; Tinos
英文摘要: The balance between the subduction of carbonate mineral-bearing rocks into Earth's mantle and the return of CO2 to the atmosphere by volcanic and metamorphic degassing is critical to the carbon cycle. Carbon is thought to be released from subducted rocks mostly by simple devolatilization reactions. However, these reactions will also retain large amounts of carbon within the subducting slab and have difficulty in accounting for the mass of CO2 emitted from volcanic arcs. Carbon release may therefore occur via fluid-induced dissolution of calcium carbonate. Here we use carbonate δ18O and δ13C systematics, combined with analyses of rock and fluid inclusion mineralogy and geochemistry, to investigate the alteration of the exhumed Eocene Cycladic subduction complex on the Syros and Tinos islands, Greece. We find that in marble rocks adjacent to two fluid conduits that were active during subduction, the abundance of calcium carbonate drastically decreases approaching the conduits, whereas silicate minerals increase. Up to 60-90% of the CO2 was released from the rocks - far greater than expected via simple devolatilization reactions. The δ18O of the carbonate minerals is 5-10‰ lighter than is typical for metamorphosed carbonate rocks, implying that isotopically light oxygen was transported by fluid infiltration from the surroundings. We suggest that fluid-mediated carbonate mineral removal, accompanied by silicate mineral precipitation, provides a mechanism for the release of enormous amounts of CO2 from subduction zones. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106560
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Geology and Geophysics, Yale University, PO Box 208109, New Haven, CT 06520-8109, United States; Yale Peabody Museum of Natural History, PO Box 208118, New Haven, CT 06520-8118, United States
Recommended Citation:
Ague J.J.,Nicolescu S.. Carbon dioxide released from subduction zones by fluid-mediated reactions[J]. Nature Geoscience,2014-01-01,7(5)