On velocity anomalies beneath southeastern China: An investigation combining mineral physics studies and seismic tomography observations
文献类型：期刊论文
| 作者 | Zhang, Yanfei1; Wang, Yanbin2; Zhao, Liang3; Jin, Zhenmin1 |
| 刊名 | GONDWANA RESEARCH
 |
| 出版日期 | 2016-03-01 |
| 卷号 | 31页码:200-217 |
| 关键词 | Southeastern China Mantle transition zone Velocity anomaly Mineral physics Seismic tomography |
| DOI | 10.1016/j.gr.2015.01.008 |
| 文献子类 | Article |
| 英文摘要 | Seismic tomography studies reveal distinct velocity and V-P/V-S anomalies in the mantle transition zone (MTZ) beneath the Yangtze Craton and Cathaysia Block in southeastern China. The anomalies under the Yangtze Craton are characterized by high velocity (both V-P and V-S) and low V-P/V-S ratio, while those beneath the Cathaysia Block are characterized by low velocity (especially V-S) and high V-P/V-S ratio. Here, we conduct analyses of phase relations and thermoelasticity to model the effects of thermal and chemical homogeneities in the MTZ, by taking advantage of recent simultaneous V-P and V-S seismic tomography results under southeastern China. We attempt to quantify the seismic tomography results and examine the effects of temperature, chemical composition, and water (or protonization) on velocity anomalies in the deep mantle. We find V-P/V-S to be a powerful parameter in distinguishing the various effects of temperature, chemical composition, and protonization. We conclude that an ancient stagnated oceanic slab is most likely the main cause of the observed fast velocity and low V-P/V-S anomalies in the MTZ under the Yangtze Craton. This ancient slab material is most likely a product of paleo Pacific subduction around 100-125 Ma ago, when the oceanic plate abruptly changed its direction of motion. Such an event has been shown to be closely related to the magmatic activities around eastern China, the ultrahigh-pressure metamorphism zone between the Yangtze Craton and the North China Craton, and the destruction of the lower crust of the North China Craton. The anomalies under the Cathaysia Block, on the other hand, are likely due to dehydration-induced partial melting of subducted Pacific slab materials. Here the large low V-S anomaly in MTZ co-incides with the extensive Mesozoic to Cenozoic igneous features on the surface, suggesting a state with lower viscosities in the upper mantle. Dehydration-induced partial melting in MTZ may have also promoted deformation of the South China fold belt Our results suggest that these lithospheric processes are directly related to the tectonic interaction between the oceanic and continental plates in southeastern China and that a better understanding of past deep mantle dynamic processes may place important constraints on the evolution of the cratons in China. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
| WOS关键词 | EQUATION-OF-STATE ; V-T EQUATION ; SINGLE-CRYSTAL ELASTICITY ; MANTLE TRANSITION REGION ; CONTINENTAL-CRUST ; HIGH-PRESSURE ; SOUTH CHINA ; EASTERN CHINA ; SOUND VELOCITIES ; THERMAL EQUATION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000371555100011 |
| 资助机构 | National Natural Science Foundation of China(41174076) ; National Natural Science Foundation of China(41174076) ; Sinoprobe-0801 ; Sinoprobe-0801 ; US NSF(EAR-0968456 ; US NSF(EAR-0968456 ; 1361276) ; 1361276) ; National Natural Science Foundation of China(41174076) ; National Natural Science Foundation of China(41174076) ; Sinoprobe-0801 ; Sinoprobe-0801 ; US NSF(EAR-0968456 ; US NSF(EAR-0968456 ; 1361276) ; 1361276) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62022]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Yanfei,Wang, Yanbin,Zhao, Liang,et al. On velocity anomalies beneath southeastern China: An investigation combining mineral physics studies and seismic tomography observations[J]. GONDWANA RESEARCH,2016,31:200-217. |
| APA | Zhang, Yanfei,Wang, Yanbin,Zhao, Liang,&Jin, Zhenmin.(2016).On velocity anomalies beneath southeastern China: An investigation combining mineral physics studies and seismic tomography observations.GONDWANA RESEARCH,31,200-217. |
| MLA | Zhang, Yanfei,et al."On velocity anomalies beneath southeastern China: An investigation combining mineral physics studies and seismic tomography observations".GONDWANA RESEARCH 31(2016):200-217. |
入库方式： OAI收割
来源：地质与地球物理研究所
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