TY - BOOK
T1 - International Ocean Discovery Program Expedition 389 preliminary report
T2 - Hawaiian drowned reefs
AU - Webster, Jody M.
AU - Ravelo, Ana Christina
AU - Grant, Hannah L.J.
AU - Stewart, Margaret
AU - Rydzy, Marisa
AU - Le Ber, Erwan
AU - Allison, Nicola
AU - Asami, Ryuji
AU - Boston, Brian
AU - Braga, Juan Carlos
AU - Brenner, Logan
AU - Chen, Xuefei
AU - Chutcharavan, Peter
AU - Dutton, Andrea
AU - Felis, Thomas
AU - Fukuyo, Naoto
AU - Gischler, Eberhard
AU - Greve, Sahra
AU - Hagen, Amy
AU - Hamon, Youri
AU - Hathorne, Ed
AU - Humblet, Marc
AU - Jorry, Stephan
AU - Khanna, Pankaj
AU - McGregor, Helen
AU - Mortlock, Richard
AU - Nohl, Theresa
AU - Potts, Donald
AU - Prohaska, Ana
AU - Prouty, Nancy
AU - Renema, Willem
AU - Rubin, Kenna Harmony
AU - Westphal, Hildegard
AU - Yokoyama, Yusuke
AU - Expedition 389 Scientists
N1 - Funding: This publication was prepared by the European Consortium for Ocean Research Drilling (ECORD) Science Operator (ESO) and Texas A&M University (TAMU) as an account of work performed under the International Ocean Discovery Program (IODP). Funding for IODP is provided by the following international partners: National Science Foundation (NSF), United States; Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan; European Consortium for Ocean Research Drilling (ECORD); Ministry of Science and Technology (MOST), People’s Republic of China; Australia-New Zealand IODP Consortium (ANZIC); Ministry of Earth Sciences (MoES), India.
PY - 2024/5/1
Y1 - 2024/5/1
N2 - Our understanding of the mechanisms controlling eustatic sea level and global climate changes has been hampered by a lack of appropriate fossil coral records over the last 500 ky, particularly into and out of the glacial periods. This problem was addressed by International Ocean Discovery Program Expedition 389 by drilling a unique succession of Hawaiian drowned coral reefs now at 110–1300 meters below sea level (mbsl). The four objectives are to investigate (1) the timing, rate, and amplitude of sea level variability to examine cryosphere and geophysical processes, including the assessment of abrupt sea level change events; (2) the processes that determine changes in mean and high-frequency (seasonal–interannual) climate variability from times with different boundary conditions (e.g., ice sheet size, pCO2, and solar forcing); (3) the response of coral reef systems to abrupt sea level and climate changes; and (4) the variation through space and time of the subsidence and the volcanic evolution of the island. To achieve these objectives, 35 holes at 16 sites ranging 131.9–1241.8 mbsl were drilled during the expedition. A total of 425 m of core was recovered, comprising reef (83%) and volcanic (17%) material. Average core recoveries were 66%, with numerous intervals characterized by very well preserved mixtures of coralgal and microbialite frameworks with recoveries >90%. Some science-critical shallow sites were not drilled due to a failure to secure permits to operate in Hawaiian state waters. Furthermore, apart from one site the target penetration depths were not achieved. Preliminary radiometric dates indicate that the recovered reef deposits are from 488 to 13 ka in age. The Onshore Science Party took place in February 2024. Cores were CT and hyperspectral scanned and described. Standard measurements were made, and samples were taken for postcruise research. Preliminary assessment of the age and quality of the reef and basalt cores suggest that many of the expedition objectives will be met.
AB - Our understanding of the mechanisms controlling eustatic sea level and global climate changes has been hampered by a lack of appropriate fossil coral records over the last 500 ky, particularly into and out of the glacial periods. This problem was addressed by International Ocean Discovery Program Expedition 389 by drilling a unique succession of Hawaiian drowned coral reefs now at 110–1300 meters below sea level (mbsl). The four objectives are to investigate (1) the timing, rate, and amplitude of sea level variability to examine cryosphere and geophysical processes, including the assessment of abrupt sea level change events; (2) the processes that determine changes in mean and high-frequency (seasonal–interannual) climate variability from times with different boundary conditions (e.g., ice sheet size, pCO2, and solar forcing); (3) the response of coral reef systems to abrupt sea level and climate changes; and (4) the variation through space and time of the subsidence and the volcanic evolution of the island. To achieve these objectives, 35 holes at 16 sites ranging 131.9–1241.8 mbsl were drilled during the expedition. A total of 425 m of core was recovered, comprising reef (83%) and volcanic (17%) material. Average core recoveries were 66%, with numerous intervals characterized by very well preserved mixtures of coralgal and microbialite frameworks with recoveries >90%. Some science-critical shallow sites were not drilled due to a failure to secure permits to operate in Hawaiian state waters. Furthermore, apart from one site the target penetration depths were not achieved. Preliminary radiometric dates indicate that the recovered reef deposits are from 488 to 13 ka in age. The Onshore Science Party took place in February 2024. Cores were CT and hyperspectral scanned and described. Standard measurements were made, and samples were taken for postcruise research. Preliminary assessment of the age and quality of the reef and basalt cores suggest that many of the expedition objectives will be met.
U2 - 10.14379/iodp.pr.389.2024
DO - 10.14379/iodp.pr.389.2024
M3 - Commissioned report
T3 - Preliminary report (International Ocean Discovery Program)
BT - International Ocean Discovery Program Expedition 389 preliminary report
PB - IODP Publications
CY - Online
ER -