Upward mantle wedge convection recorded by Zhimafang orogenic garnet-lherzolite, Sulu UHP terrane, eastern China.
文献类型：期刊论文
| 作者 | Song YanRu1,2; Ye Kai1; Xu HaiJin3,4 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2009 |
| 卷号 | 25期号:1页码:147-158 |
| 关键词 | Garnet-lherzolite Oceanic subduction Mantle wedge convection Zhimafang Sulu UHP terrane |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Many orogenic garnet peridotite bodies are enclosed in ultrahigh-pressure (UHP) gneisses and/or migmatites in Sulu UHP terrane. On the basis of their field occurrence and bulk rock geochemistry, a group of garnet peridotites have been derived from depleted mantle and were subsequently metasomatized by melts and/or fluids derived from the subducted continental crust. However, their early stage depletion processes are still unclear. New evidence on early stage metamorphism of the garnet lherzolite from Zhimafang, Donghai County, Sulu UHP terrane are reported. Based on detailed analysis of reaction textures and mineral compositions, the Zhimafang garnet lherzolite have experienced at least two stages of metamorphism before they were evolved in high P-T subduction zone metamorphism. The protolith of the Zhimafang garnet lherzolite was a high- pressure and high-temperature fertile garnet lherzolite, which is defined by the high Ca-Cr core of garnet porphyroclast and inclusions of high-Mg clinopyroxene, high-Al-Cr orthopyroxene and high-Mg olivine. The rocks were then transformed to a high-temperature and low-pressure refractory spinel-hurzbergite or spinel-dunite, as indicated by the presence of abundant relict high-Al chromite and high-Mg, low-Ni olivine, as well as high-Mg orthopyroxene included in the low-Cr mantle of the porphyroclastic garnet and core of fine-grained neoblastic garnet, clinopyroxene is absent in this stage. The early stage metamorphic evolutions of the Zhimafang garnet therzolite suggest that it experienced upward mantle wedge convection during the subduction of previous oceanic slab before they were evolved in the high P-T subduction zone metamorphism due to subsequent continental subduction. We propose that the Zhimafang gamat lherzolite were originated from deep, hot and fertile mantle wedge above the, previously subducted oceanic slab, thermal buoyancy in the mantle wedge above the subducted oceanic slab resulted in their convection to shallower back are and sub-are mantle wedge, and decompressional melting transformed the enriched garnet-lherzolite to depleted spinel-hurzbergite or spinel-dunite. |
| WOS关键词 | OXYGEN-ISOTOPE EVIDENCE ; DRY PERIDOTITE KLB-1 ; ZIRCON U-PB ; HIGH-PRESSURE ; METAMORPHIC TERRANE ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; EARTHS MANTLE ; DUAL ORIGIN ; SUBDUCTION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000264381800012 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/70940]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Song YanRu |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.China Univ Geosci, Editorial Off Journal, Wuhan 430074, Peoples R China 3.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China 4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resoures, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song YanRu,Ye Kai,Xu HaiJin. Upward mantle wedge convection recorded by Zhimafang orogenic garnet-lherzolite, Sulu UHP terrane, eastern China.[J]. ACTA PETROLOGICA SINICA,2009,25(1):147-158. |
| APA | Song YanRu,Ye Kai,&Xu HaiJin.(2009).Upward mantle wedge convection recorded by Zhimafang orogenic garnet-lherzolite, Sulu UHP terrane, eastern China..ACTA PETROLOGICA SINICA,25(1),147-158. |
| MLA | Song YanRu,et al."Upward mantle wedge convection recorded by Zhimafang orogenic garnet-lherzolite, Sulu UHP terrane, eastern China.".ACTA PETROLOGICA SINICA 25.1(2009):147-158. |
入库方式： OAI收割
来源：地质与地球物理研究所
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