High P-T calcite-aragonite phase transitions under hydrous and anhydrous conditions | |
Xia Zhao1,2; Zhi Zheng2; Jiangzhi Chen2; Yue Gao1,2; Jianhui Sun2; Xue Hou2; Mengjun Xiong1,2; Shenghua Mei2 | |
刊名 | Frontiers in Earth Science |
2022 | |
卷号 | 1页码:1 |
关键词 | calcite aragonite ikaite phase transition high P-T Raman spectroscopy |
DOI | 10.3389/feart.2022.907967 |
通讯作者 | Mei, Shenghua(mei@idsse.ac.cn) |
英文摘要 | The subduction of calcite into deep Earth and subsequent phase change are important for global carbon cycle. However, the study of the phase boundary between calcite and aragonite under high P-T conditions is insufficient due to sparse existing phase points and narrow pressure range. In addition, the impact of aqueous fluid on the phase transition requires further investigation. In this work, the calcite-aragonite phase transitions in both anhydrous and hydrous conditions were studied using diamond anvil cell (DAC) with in-situ Raman spectroscopy. In the anhydrous condition, investigations were conducted up to 12 GPa and 400 °C and only the solid recrystallization-reconstructive (SRR) phase transition was observed. The calcite-aragonite boundary shows a convex upward curve with the minimum transformation temperature at around 150 °C and a wide transformation pressure range from 1 to 13 GPa, consistent with the molar volume change between aragonite and calcite-I/II/III/IIIb. In the hydrous condition, both the SRR phase transition and dissolution-precipitation-dehydration (DPD) phase transition were observed under different heating conditions, and in the DPD phase transition ikaite serves as an intermediate phase precipitated from dissolved calcite and then dehydrates into aragonite. Our results suggest the phase transition of calcite-aragonite in the subduction zone, where the SRR phase transition can exist in slabs under wide P-T conditions (1.5 to 2 GPa and 160 to 400 °C), and the DPD process can only occur under lower P-T conditions (less than 1.5 GPa and 110 °C). |
资助项目 | Chinese Academy of Sciences ; National Natural Science Foundation of China[41674097] |
WOS关键词 | HIGH-PRESSURE PHASE ; CRYSTAL-STRUCTURE ; IN-SITU ; RAMAN-SPECTROSCOPY ; X-RAY ; CACO3 ; CARBON ; TRANSFORMATION ; STABILITY ; POLYMORPHS |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | FRONTIERS MEDIA SA |
WOS记录号 | WOS:000819378500001 |
内容类型 | 期刊论文 |
源URL | [http://ir.idsse.ac.cn/handle/183446/9464] |
专题 | 深海科学研究部_深海极端环境模拟研究实验室 |
作者单位 | 1.University of Chinese Academy of Sciences, Beijing 100049, China 2.CAS Key Laboratory for Experimental Study under Deep-sea Extreme Conditions, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China |
推荐引用方式 GB/T 7714 | Xia Zhao,Zhi Zheng,Jiangzhi Chen,et al. High P-T calcite-aragonite phase transitions under hydrous and anhydrous conditions[J]. Frontiers in Earth Science,2022,1:1. |
APA | Xia Zhao.,Zhi Zheng.,Jiangzhi Chen.,Yue Gao.,Jianhui Sun.,...&Shenghua Mei.(2022).High P-T calcite-aragonite phase transitions under hydrous and anhydrous conditions.Frontiers in Earth Science,1,1. |
MLA | Xia Zhao,et al."High P-T calcite-aragonite phase transitions under hydrous and anhydrous conditions".Frontiers in Earth Science 1(2022):1. |
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