This README file was generated on 2023-04-28 by Yanfei Zhang. GENERAL INFORMATION 1. Title of Dataset: Phase compositions carbonated oceanic crust 2. Author Information A. Principal Investigator Contact Information Name: Yanfei Zhang Institution: China University of Geosciences (Wuhan) Address: No. 388, Lumo road, Wuhan 430074, China Email: yanfzhang@cug.edu.cn B. Associate or Co-investigator Contact Information Name: Chao Wang Institution: China University of Geosciences (Wuhan) Address: No. 388, Lumo road, Wuhan 430074, China Email: wangchao@cug.edu.cn 3. Date of data collection (single date, range, approximate date): 2019-2022 4. Geographic location of data collection: China University of Geosciences (Wuhan), Wuhan, China 5. Information about funding sources that supported the collection of the data: NSF-91858104, National Nature Science Foundation of China SHARING/ACCESS INFORMATION 1. Licenses/restrictions placed on the data: CC0 1.0 Universal (CC0 1.0) Public Domain 2. Links to publications that cite or use the data: Yanfei Zhang, Chao Wang, Wei Li, Zhenjin Jin. (2023). Carbon dioxide released from subducted oceanic crust by hydrous carbonatitic liquids. Geophysical Research Letters. 3. Links to other publicly accessible locations of the data: None 4. Links/relationships to ancillary data sets: None 5. Was data derived from another source? No A. If yes, list source(s): NA 6. Recommended citation for this dataset: Yanfei Zhang, Chao Wang, Wei Li, Zhenjin Jin. (2023). Data from: Phase compositions in carbonated oceanic crust. Dryad Digital Repository. https://doi.org/10.5061/dryad.ncjsxkt1f DATA & FILE OVERVIEW 1. File List: A) EPMA data\_Starting material.xlsx B) EPMA data\_run conditions.xlsx C) EPMA data\_garnet.xlsx D) EPMA data\_clinopyroxene.xlsx E) EPMA data\_carbonate.xlsx F) EPMA data\_liquid.xlsx G) EPMA data\_rutile.xlsx H) EPMA data\_other.xlsx 2. Relationship between files, if important: None 3. Additional related data collected that was not included in the current data package: None 4. Are there multiple versions of the dataset? No A. If yes, name of file(s) that was updated: NA i. Why was the file updated? NA ii. When was the file updated? NA ######################################################################### DATA-SPECIFIC INFORMATION FOR: EPMA data\_Starting material.xlsx 1. Number of columns: 4 2. Number of rows: 14 3. Columns List: * name: elements * TVG02: mid ocean ridge basalt glass * BCC-1: starting material #1 * BCC-2: starting material #2 4. Missing data codes: None 5. Specialized formats or other abbreviations used: None ######################################################################### DATA-SPECIFIC INFORMATION FOR: EPMA data\_run conditions.xlsx 1. Number of columns: 16 2. Number of rows: 35 3. Columns List: * Run: experimental number * Pressure/GPa: experimental pressure * Temperature/oC: experimental temperature * Duration/h: experimental duration * garnet: weight percent of garnet * clinopyroxene: weight percent of clinopyroxene * coesite/stishovite: weight percent of coesite/stishovite * rutile: weight percent of rutile * FeTi-oxide: weight percent of FeTi-oxide * epidote: weight percent of epidote * lawsonite: weight percent of lawsonite * phengite: weight percent of phengite * carbonate: weight percent of carbonate * silicate liquid: weight percent of silicate liquid * carbonatitic liquid: weight percent of carbonatitic liquid * r2: sum of residual square 4. Missing data codes: "n/a" = phase not exist 5. Specialized formats or other abbreviations used: "trace" = the weight percent of phase is very trace ######################################################################### DATA-SPECIFIC INFORMATION FOR: EPMA data\_garnet.xlsx 1. Number of columns: 69 2. Number of rows: 33 3. Columns List: * Run: experimental number * ±: uncertainty 4. Missing data codes: "n/a", data not exist 5. Specialized formats or other abbreviations used: P/GPa = pressure, T/oC = temperature, n: analyses number ######################################################################### DATA-SPECIFIC INFORMATION FOR: EPMA data\_clinopyroxene.xlsx 1. Number of columns: 68 2. Number of rows: 30 3. Columns List: * Run: experimental number * ±: uncertainty 4. Missing data codes: "n/a", data not exist 5. Specialized formats or other abbreviations used: P/GPa = pressure, T/oC = temperature, n: analyses number ######################################################################### DATA-SPECIFIC INFORMATION FOR: EPMA data\_carbonate.xlsx 1. Number of columns: 31 2. Number of rows: 29 3. Columns List: * Run: experimental number * ±: uncertainty 4. Missing data codes: "n/a", data not exist 5. Specialized formats or other abbreviations used: P/GPa = pressure, T/oC = temperature, n: analyses number ######################################################################### DATA-SPECIFIC INFORMATION FOR: EPMA data\_liquid.xlsx 1. Number of columns: 32 2. Number of rows: 15 3. Columns List: * Run: experimental number * ±: uncertainty 4. Missing data codes: "n/a", data not exist 5. Specialized formats or other abbreviations used: P/GPa = pressure, T/oC = temperature, n: analyses number ######################################################################### DATA-SPECIFIC INFORMATION FOR: EPMA data\_rutile.xlsx 1. Number of columns: 45 2. Number of rows: 26 3. Columns List: * Run: experimental number * ±: uncertainty 4. Missing data codes: "n/a", data not exist 5. Specialized formats or other abbreviations used: P/GPa = pressure, T/oC = temperature, n: analyses number ######################################################################### DATA-SPECIFIC INFORMATION FOR: EPMA data\_other.xlsx 1. Number of columns: 30 2. Number of rows: 27 3. Columns List: * Run: experimental number * ±: uncertainty 4. Missing data codes: "n/a", data not exist 5. Specialized formats or other abbreviations used: P/GPa = pressure, T/oC = temperature, n: analyses number

High-pressure experiments were performed at 3–15 GPa and 700–1300°C in a 1000-ton multi-anvil press at the SEDI-Lab, China University of Geosciences (Wuhan), to investigate the phase relations of subducted carbon-bearing oceanic crust. Thirty-four samples were recovered after the experiments. All minerals in the recovered experimental charges were analyzed with an electron probe micro-analyzer (EPMA, JXA-8230), installed at the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan). The accelerating voltage was 15 kV, and counting times were 10 s for the measured elements and 5 s for each side of the background. A beam current of 20 nA and beam size of 1–2 µm were used for silicate minerals and Ti-rich oxides. For quench liquids, a beam current of 10 nA and beam size of ~5–20 µm. 

Phase compositions in the recovered charges were analyzed with an electron probe micro-analyzer (EPMA, JXA-8230).