Formation mechanisms of ringwoodite: clues from the Martian meteorite Northwest Africa 8705
文献类型：期刊论文
| 作者 | Zhang,Ting1,2; Hu,Sen1; Wang,Nian1,2; Lin,Yangting1; Gu,Lixin1,3; Tang,Xu1,3; Zou,Xinyu4; Zhang,Mingming1 |
| 刊名 | Earth, Planets and Space
 |
| 出版日期 | 2021-08-24 |
| 卷号 | 73期号:1 |
| 关键词 | Martian meteorite Shock metamorphism Ringwoodite High-pressure phase transformation Shock-induced melt |
| DOI | 10.1186/s40623-021-01494-1 |
| 英文摘要 | AbstractRingwoodite and wadsleyite are the high-pressure polymorphs of olivine, which are common in shocked meteorites. They are the major constituent minerals in the terrestrial mantle. NWA 8705, an olivine-phyric shergottite, was heavily shocked, producing shock-induced melt veins and pockets associated with four occurrences of ringwoodite: (1) the lamellae intergrown with the host olivine adjacent to a shock-induced melt pocket; (2) polycrystalline assemblages preserving the shapes and compositions of the pre-existing olivine within a shock-induced melt vein (60?μm in width); (3) the rod-like grains coexisting with wadsleyite and clinopyroxene within a shock-induced melt vein; (4) the microlite clusters embedded in silicate glass within a very thin shock-induced melt vein (20?μm in width). The first two occurrences of ringwoodite likely formed via solid-state transformation from olivine, supported by their morphological features and homogeneous compositions (Mg# 64–62) similar to the host olivine (Mg# 66–64). The third occurrence of ringwoodite might fractionally crystallize from the shock-induced melt, based on its heterogeneous and more FeO-enriched compositions (Mg# 76–51) than those of the coexisting wadsleyite (Mg# 77–67) and the host olivine (Mg# 66–64) of this meteorite. The coexistence of ringwoodite, wadsleyite, and clinopyroxene suggests a post-shock pressure of 14–16 GPa and a temperature of 1650–1750 °C. The fourth occurrence of ringwoodite with compositional variation (Mg# 72–58) likely crystallized from melt at 16–18 GPa and 1750–1850 °C. The presence of the four occurrences of ringwoodite was probably due to their very fast cooling rates in and/or adjacent to the thin shock-induced melt veins and small pockets. In addition, the higher Fa-contents of the host olivine (Fa35–39) in NWA 8705 than those in ordinary chondrites (Fa16–32) makes the olivine–ringwoodite transformation prolong to a lower pressure. |
| 语种 | 英语 |
| WOS记录号 | BMC:10.1186/S40623-021-01494-1 |
| 出版者 | Springer Berlin Heidelberg |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/98771]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Lin,Yangting |
| 作者单位 | 1.Chinese Academy of Sciences; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics 2.University of Chinese Academy of Sciences 3.Chinese Academy of Sciences; Electron Microscope Laboratory, Institute of Geology and Geophysics 4.Chinese Academy of Sciences; Key Laboratory of Mineral Resources, Institute of Geology and Geophysics |
| 推荐引用方式 GB/T 7714 | Zhang,Ting,Hu,Sen,Wang,Nian,et al. Formation mechanisms of ringwoodite: clues from the Martian meteorite Northwest Africa 8705[J]. Earth, Planets and Space,2021,73(1). |
| APA | Zhang,Ting.,Hu,Sen.,Wang,Nian.,Lin,Yangting.,Gu,Lixin.,...&Zhang,Mingming.(2021).Formation mechanisms of ringwoodite: clues from the Martian meteorite Northwest Africa 8705.Earth, Planets and Space,73(1). |
| MLA | Zhang,Ting,et al."Formation mechanisms of ringwoodite: clues from the Martian meteorite Northwest Africa 8705".Earth, Planets and Space 73.1(2021). |
入库方式： OAI收割
来源：地质与地球物理研究所
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