Thermoelastic Properties of Eclogitic Garnets and Omphacites: Implications for Deep Subduction of Oceanic Crust and Density Anomalies in the Upper Mantle
文献类型：期刊论文
| ; | |
| 作者 | Jingui Xu; Dongzhou Zhang; Dawei Fan; Przemyslaw Dera; Feng Shi; Wenge Zhou |
| 刊名 | Geophysical Research Letters
 ; Geophysical Research Letters
|
| 出版日期 | 2019 ; 2019 |
| 页码 | 179-188 |
| 英文摘要 | Synchrotron-based high pressure-temperature single-crystal X-ray diffraction experiments to ~24 GPa and 700 K were conducted on eclogitic garnets (low-Fe: Prp28Alm38Grs33Sps1 and high-Fe: Prp14Alm62Grs19Adr3Sps2) and omphacites (low-Fe: Quad57Jd42Ae1 and high-Fe: Quad53Jd27Ae20), using externally-heated diamond anvil cell. Fitting the pressure-volumetemperature data to a third-order Birch-Murnaghan equation of state yields the thermoelastic parameters including bulk modulus (KT0), its pressure derivative (K′T0), temperature derivative ((∂KT/∂T)P) and thermal expansion coefficient (αT). The densities of the high-Fe and low-Fe eclogites were then modeled along typical geotherms of the normal mantle and the subducted oceanic crust to the transition zone depth (550 km). The metastable low-Fe eclogite could be a reason for the stagnant slabs within the upper range of the transition zone. Eclogite would be responsible for density anomalies within 100-200 km in the upper mantle of Asia. ;Synchrotron-based high pressure-temperature single-crystal X-ray diffraction experiments to ~24 GPa and 700 K were conducted on eclogitic garnets (low-Fe: Prp28Alm38Grs33Sps1 and high-Fe: Prp14Alm62Grs19Adr3Sps2) and omphacites (low-Fe: Quad57Jd42Ae1 and high-Fe: Quad53Jd27Ae20), using externally-heated diamond anvil cell. Fitting the pressure-volumetemperature data to a third-order Birch-Murnaghan equation of state yields the thermoelastic parameters including bulk modulus (KT0), its pressure derivative (K′T0), temperature derivative ((∂KT/∂T)P) and thermal expansion coefficient (αT). The densities of the high-Fe and low-Fe eclogites were then modeled along typical geotherms of the normal mantle and the subducted oceanic crust to the transition zone depth (550 km). The metastable low-Fe eclogite could be a reason for the stagnant slabs within the upper range of the transition zone. Eclogite would be responsible for density anomalies within 100-200 km in the upper mantle of Asia. |
| 语种 | 英语 ; 英语 |
| 源URL | [http://ir.gyig.ac.cn/handle/42920512-1/10613]  |
| 专题 | 地球化学研究所_地球内部物质高温高压实验室 |
| 作者单位 | 1.Key Laboratory of High Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China 2.Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii, USA 3.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geoscience, Wuhan, China |
| 推荐引用方式 GB/T 7714 | Jingui Xu,Dongzhou Zhang,Dawei Fan,et al. Thermoelastic Properties of Eclogitic Garnets and Omphacites: Implications for Deep Subduction of Oceanic Crust and Density Anomalies in the Upper Mantle, Thermoelastic Properties of Eclogitic Garnets and Omphacites: Implications for Deep Subduction of Oceanic Crust and Density Anomalies in the Upper Mantle[J]. Geophysical Research Letters, Geophysical Research Letters,2019, 2019:179-188, 179-188. |
| APA | Jingui Xu,Dongzhou Zhang,Dawei Fan,Przemyslaw Dera,Feng Shi,&Wenge Zhou.(2019).Thermoelastic Properties of Eclogitic Garnets and Omphacites: Implications for Deep Subduction of Oceanic Crust and Density Anomalies in the Upper Mantle.Geophysical Research Letters,179-188. |
| MLA | Jingui Xu,et al."Thermoelastic Properties of Eclogitic Garnets and Omphacites: Implications for Deep Subduction of Oceanic Crust and Density Anomalies in the Upper Mantle".Geophysical Research Letters (2019):179-188. |
入库方式： OAI收割
来源：地球化学研究所
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