TY - JOUR
T1 - Generation of hydrous-carbonated plumes in the mantle transition zone linked to tectonic erosion and subduction
AU - Safonova, Inna
AU - Maruyama, Shigenori
AU - Litasov, Konstantin
N1 - Funding Information:
This paper is a tribute to Professor Brian Windley, whose contributions to the understanding of Asian geology and tectonics cannot be overestimated and almost no paper published on the Central Asian Orogenic belt during the last 20 years has escaped from citing his influential ideas and publications, which will undoubtedly last for generations to come. This work was supported by the Ministry of Education and Science of the Russian Federation , project no. 14.B25.31.0032 , Grant-in-Aid for Scientific Research no. 23224012 , Global COE program From the Earth to “Earths,” Scientific Project of the Institute of Geology and Mineralogy SB RAS, and JSPS Grant-in-Aid no. 14526 (IS). We acknowledge the fruitful discussions with John Hernlund (ELSI), Kenji Kawai (Univ. of Tokyo), Sergei Krivonogov and Igor Novikov (IGM SB RAS). The comments from Dr. Kenji Kawai and two anonymous reviewers and from the Guest Editors, Prof. Timothy Kusky and Wenjiao Xiao, are much appreciated as all helped us to improve the MS to a great extent. Our work is a contribution to IGCP#592 Project “Continental Construction in Central Asia” under the patronage of UNESCO-IUGS.
Funding Information:
This paper is a tribute to Professor Brian Windley, whose contributions to the understanding of Asian geology and tectonics cannot be overestimated and almost no paper published on the Central Asian Orogenic belt during the last 20 years has escaped from citing his influential ideas and publications, which will undoubtedly last for generations to come. This work was supported by the Ministry of Education and Science of the Russian Federation, project no. 14.B25.31.0032, Grant-in-Aid for Scientific Research no. 23224012, Global COE program From the Earth to "Earths," Scientific Project of the Institute of Geology and Mineralogy SB RAS, and JSPS Grant-in-Aid no. 14526 (IS). We acknowledge the fruitful discussions with John Hernlund (ELSI), Kenji Kawai (Univ. of Tokyo), Sergei Krivonogov and Igor Novikov (IGM SB RAS). The comments from Dr. Kenji Kawai and two anonymous reviewers and from the Guest Editors, Prof. Timothy Kusky and Wenjiao Xiao, are much appreciated as all helped us to improve the MS to a great extent. Our work is a contribution to IGCP#592 Project "Continental Construction in Central Asia" under the patronage of UNESCO-IUGS.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/12/4
Y1 - 2015/12/4
N2 - This paper presents a model for the generation of hydrous-carbonated plumes (HCPs) in the mantle transition zone (MTZ) linking (i) the Pacific-type convergent margins; (ii) melt generation in the MTZ under the influence of volatiles (water, carbon dioxide) and subducted granitic material and oceanic slabs and (iii) the Meso-Cenozoic intra-plate magmatism in Central Asia. The model is based on four groups of evidences obtained from geology, petrology, seismic tomography and numerical simulations. The double-sided subduction at the Pacific-type margins around post-Miocene Asia supplies hydrated-carbonated oceanic crust and continental crust materials down to the deep mantle, which accumulate in the MTZ at 410-660 km. The delivery of crustal material to the MTZ is provided by the direct subduction of intra-oceanic arcs in the Western Pacific and by the tectonic erosion of convergent margin hanging walls. The U-Th-K-enriched continental material accumulated in the MTZ can serve an additional source of heat. Evidence for the subduction of continental crust materials comes from seismic tomography and numerical modelling data. The subducting oceanic slab consisting of serpentinites, hydrated sediments, carbonates and carbonatized basalts can supply water and carbon dioxide to the deep mantle and metasomatize it. The presence of volatiles, which can reduce melting temperature, and the presence of the subducted crustal material, which may serve an additional heater, can synergistically trigger the generation of HCPs. Those HCPs can induce mantle upwelling, melting of the metasomatized mantle and subducted MORB slabs, ascent of melts, surface rifting and formation of mafic and bimodal volcanic series. In addition, they can contribute to the supercontinent cycle. The HCPs generated in the MTZ beneath Central and East Asia resulted in a shift of the tectonic regime from transpression to transtension and in the formation of numerous Meso-Cenozoic intra-plate volcanic fields.
AB - This paper presents a model for the generation of hydrous-carbonated plumes (HCPs) in the mantle transition zone (MTZ) linking (i) the Pacific-type convergent margins; (ii) melt generation in the MTZ under the influence of volatiles (water, carbon dioxide) and subducted granitic material and oceanic slabs and (iii) the Meso-Cenozoic intra-plate magmatism in Central Asia. The model is based on four groups of evidences obtained from geology, petrology, seismic tomography and numerical simulations. The double-sided subduction at the Pacific-type margins around post-Miocene Asia supplies hydrated-carbonated oceanic crust and continental crust materials down to the deep mantle, which accumulate in the MTZ at 410-660 km. The delivery of crustal material to the MTZ is provided by the direct subduction of intra-oceanic arcs in the Western Pacific and by the tectonic erosion of convergent margin hanging walls. The U-Th-K-enriched continental material accumulated in the MTZ can serve an additional source of heat. Evidence for the subduction of continental crust materials comes from seismic tomography and numerical modelling data. The subducting oceanic slab consisting of serpentinites, hydrated sediments, carbonates and carbonatized basalts can supply water and carbon dioxide to the deep mantle and metasomatize it. The presence of volatiles, which can reduce melting temperature, and the presence of the subducted crustal material, which may serve an additional heater, can synergistically trigger the generation of HCPs. Those HCPs can induce mantle upwelling, melting of the metasomatized mantle and subducted MORB slabs, ascent of melts, surface rifting and formation of mafic and bimodal volcanic series. In addition, they can contribute to the supercontinent cycle. The HCPs generated in the MTZ beneath Central and East Asia resulted in a shift of the tectonic regime from transpression to transtension and in the formation of numerous Meso-Cenozoic intra-plate volcanic fields.
KW - Central-East Asia
KW - Continental crust material
KW - Mantle heating
KW - Pacific-type convergent margins
KW - Sources of volatiles
KW - Surface rifting
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U2 - 10.1016/j.tecto.2015.08.005
DO - 10.1016/j.tecto.2015.08.005
M3 - Article
AN - SCOPUS:84941299774
SN - 0040-1951
VL - 662
SP - 454
EP - 471
JO - Tectonophysics
JF - Tectonophysics
ER -