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Carbon-bearing fluids forming in the process of metamorphism of subduction zones
Liu JingBo1,2
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:1Pages:89-98
AbstractCarbon-bearing rocks in subduction zones produce carbon-bearing aqueous fluids, silicate-rich supercritical fluids and carbon-bearing melts by metamorphic reactions during the subduction process. The formation of different fluid types relies on the compositions of rocks and the P-T conditions that the rocks suffered. The P-T conditions of carbonate devolatilization reactions depend on the initial compositions of fluids, and in the presence of H2O, the reactions occur at decreasing temperature conditions. At the high-pressure conditions, the dissolution of carbonate minerals in fluid is substantial mechanism for formation of carbon-bearing fluid, which parobably plays more important role than that of carbonate devolatilization reactions for carbon removal of rocks. In high-temperature circumstances such as hot subduction zones and in the case of diapirs of the rocks of subduction zones into mantle wedge, partial melting of carbon-bearing rocks can produce carbon-bearing melts that are responsible for carbon migration. Silicate-rich supercritical fluids probably form above the second critical endpoint, and multiphase solid inclusions observed in some minerals of UHP rocks were considered to be crystallized from such fluids. However, there are many open questions, and more experiments need for such interpretation. Carbon-bearing rocks in subduction zones were brought into deep mantle by subduction, and produce different types of carbon-bearing fluids in terms of different geotherms of subduction zones. The migration of carbon-bearing fluids into mantle wedge results in formation of carbon-bearing arc magmas, and subducted carbon is finally released to the surface in the eruptive process of the magmas, which makes the cycle of carbon in subduction zone-island arc system.
KeywordSubduction zone Cycle of carbon Carbon-bearing fluid Multiphase solid inclusion Melt inclusion
DOI10.18654/1000-0569/2019.01.06
WOS KeywordMULTIPHASE SOLID INCLUSIONS ; ULTRAHIGH-PRESSURE ECLOGITE ; DABIE-SULU TERRANES ; MELT INCLUSIONS ; MANTLE PRESSURES ; UHP METAMORPHISM ; PHASE-RELATIONS ; AQUEOUS FLUIDS ; GARNET ; ERZGEBIRGE
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000456937400006
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90524
Collection岩石圈演化国家重点实验室
Corresponding AuthorLiu JingBo
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Liu JingBo. Carbon-bearing fluids forming in the process of metamorphism of subduction zones[J]. ACTA PETROLOGICA SINICA,2019,35(1):89-98.
APA Liu JingBo.(2019).Carbon-bearing fluids forming in the process of metamorphism of subduction zones.ACTA PETROLOGICA SINICA,35(1),89-98.
MLA Liu JingBo."Carbon-bearing fluids forming in the process of metamorphism of subduction zones".ACTA PETROLOGICA SINICA 35.1(2019):89-98.
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