2:45 PM - 3:00 PM
[MGI31-10] Introduction of the repository core re-discovery program
★Invited Papers
Keywords:Repository core, Indian Ocean, Japan Trench, Japan Sea
The Repository Core Re-Discovery Program (ReCoRD), just launched in FY2023, is jointly operated by the Japan Drilling Earth Science Consortium (J-DESC) and the Kochi Core Center (KCC, a core storage and analysis facility jointly operated by Kochi University and JAMSTEC). This program aims to create new achievements by re-analyzing repository cores stored at KCC. Once a project is approved by KCC, digital data such as X-ray CT scan images are first acquired by the KCC staffs, and these digital data will be shared by the participants. Anyone can participate in the project by submitting sample requests. Then, a sampling party (including re-description and individual sampling) is held at KCC for re-description and individual sampling.
Repository cores are a scientific resource that can be used for academic purposes by anyone who submits a sample request under the current IODP policy. The ReCoRD will be implemented within the existing policy, without changing or creating a new framework for the IODP sample requests. The difference from a normal sample request is that ReCoRD will be conducted not by an individual or a small group, but by a relatively large research team similar to a science party on a drilling expedition.
The flow of ReCoRD is:
1) Lead Proponent submits a ReCoRD implementation proposal to J-DESC.
2) Proposals are reviewed for scientific significance and feasibility by the ReCoRD Evaluation Team, and several proposals may be approved by KCC each year.
3) Based on the accepted proposals, preliminary data on the target core samples (e.g., X-ray CT scanning and digital imaging, etc.) will be acquired by KCC staffs. Depending on the type of data to be acquired, a data request is submitted to IODP.
4) Each participant submits a sample request for the target cores to IODP.
5) An intensive sampling party including re-description and individual sampling of the target cores are held in KCC for a period of about 2 weeks.
6) The Lead Proponent will take the lead in preparing the results report.
For more information, please visit https://j-desc.org/en/record/
Implemented Projects
The first ReCoRD proposal, ReC23-01 "Tracing Intermediate Water Current Changes and Sea Ice Expansion in the Indian Ocean", uses cores recovered from Holes 266, 707A, and 752A in the Indian Ocean to reconstruct the history of intermediate water formation since the Miocene and to elucidate the relationship with the Neogene-Quaternary climate shift. The redescription and sampling party was conducted at KCC in September 2023. One of the highlights was that ice rafted debris (IRD) were clearly imaged in the X-ray CT scanning of the cores of Site 266. The distribution and occurrence of IRD, which could be precisely quantified with the X-ray CT images, will provide information on the history of the Antarctic ice sheet.
Projects to be implemented
The second project, ReC23-02 "Understanding the Formation Process and Physical Property Distribution of the Upper Prism in the Japan Trench” has been approved recently, and its sampling party is scheduled to take place in March 2024. The objective is to study the physical properties of the drilled cores from Holes 434B, 436, 439, 440B, and C0019 off Tohoku, Japan.
The third session ReC23-03 "The Japan Sea paleoceanography and paleoclimatology during the Miocene" is under preparation to be carried out in the first half of FY2024. The objective is to reconstruct the paleoenvironment of the Japan Sea during the Miocene, targeting Holes 794B, 795B, 797B-C, U1425B, U1425D, and U1430A-B in the Japan Sea.
Summary
Currently, several other programs utilizing repository cores have been launched in addition to ReCoRD, of which ReCoRD is one of the first prototypes to be implemented. The key issues are a quick review process, preparation for implementation, community awareness, and securing a budget. The knowledge gained through the prototype will provide important information for the start of similar programs in the international framework in the future.
Repository cores are a scientific resource that can be used for academic purposes by anyone who submits a sample request under the current IODP policy. The ReCoRD will be implemented within the existing policy, without changing or creating a new framework for the IODP sample requests. The difference from a normal sample request is that ReCoRD will be conducted not by an individual or a small group, but by a relatively large research team similar to a science party on a drilling expedition.
The flow of ReCoRD is:
1) Lead Proponent submits a ReCoRD implementation proposal to J-DESC.
2) Proposals are reviewed for scientific significance and feasibility by the ReCoRD Evaluation Team, and several proposals may be approved by KCC each year.
3) Based on the accepted proposals, preliminary data on the target core samples (e.g., X-ray CT scanning and digital imaging, etc.) will be acquired by KCC staffs. Depending on the type of data to be acquired, a data request is submitted to IODP.
4) Each participant submits a sample request for the target cores to IODP.
5) An intensive sampling party including re-description and individual sampling of the target cores are held in KCC for a period of about 2 weeks.
6) The Lead Proponent will take the lead in preparing the results report.
For more information, please visit https://j-desc.org/en/record/
Implemented Projects
The first ReCoRD proposal, ReC23-01 "Tracing Intermediate Water Current Changes and Sea Ice Expansion in the Indian Ocean", uses cores recovered from Holes 266, 707A, and 752A in the Indian Ocean to reconstruct the history of intermediate water formation since the Miocene and to elucidate the relationship with the Neogene-Quaternary climate shift. The redescription and sampling party was conducted at KCC in September 2023. One of the highlights was that ice rafted debris (IRD) were clearly imaged in the X-ray CT scanning of the cores of Site 266. The distribution and occurrence of IRD, which could be precisely quantified with the X-ray CT images, will provide information on the history of the Antarctic ice sheet.
Projects to be implemented
The second project, ReC23-02 "Understanding the Formation Process and Physical Property Distribution of the Upper Prism in the Japan Trench” has been approved recently, and its sampling party is scheduled to take place in March 2024. The objective is to study the physical properties of the drilled cores from Holes 434B, 436, 439, 440B, and C0019 off Tohoku, Japan.
The third session ReC23-03 "The Japan Sea paleoceanography and paleoclimatology during the Miocene" is under preparation to be carried out in the first half of FY2024. The objective is to reconstruct the paleoenvironment of the Japan Sea during the Miocene, targeting Holes 794B, 795B, 797B-C, U1425B, U1425D, and U1430A-B in the Japan Sea.
Summary
Currently, several other programs utilizing repository cores have been launched in addition to ReCoRD, of which ReCoRD is one of the first prototypes to be implemented. The key issues are a quick review process, preparation for implementation, community awareness, and securing a budget. The knowledge gained through the prototype will provide important information for the start of similar programs in the international framework in the future.