Y. Rosenthal , A.E. Holbourn , D.K. Kulhanek , I.W. Aiello , T.L. Babila , G. Bayon , L. Beaufort , S.C. Bova , J.-H. Chun , H. Dang , A.J. Drury , T. Dunkley Jones , P.P.B. Eichler , A.G.S. Fernando , K. Gibson , R.G. Hatfield , D.L. Johnson , Y. Kumagai , T. Li , B.K. Linsley , N. Meinicke , G.S. Mountain , B.N. Opdyke , P.N. Pearson , C.R. Poole , A.C. Ravelo , T. Sagawa , A. Schmitt , J.B. Wurtzel , J. Xu , M. Yamamoto , Y.G. Zhang
08 June 2018
International Ocean Discovery Program (IODP) Site U1489 is located on the western slope of the southern Eauripik Rise at 02°07.19ʹN, 141°01.67ʹE in 3421 m water depth. Site U1489 is situated on the western slope of the southern part of Eauripik Rise, within the Caroline Basin north of Papua New Guinea. Site U1489 is located ~2° north of the Equator and is thus suitable for reconstructing the hydrographic history of the Western Pacific Warm Pool (WPWP). The comparatively low sedimentation rate at this site, typical of open-ocean environments, allows coring of the middle Miocene at a relatively shallow depth, which was not possible at Site U1488, offering the opportunity to reconstruct the evolution of the WPWP from the Middle Miocene Climate Optimum to the middle Miocene climate transition associated with expansion of the Antarctic ice sheet. At ~3400 meters below sea level (mbsl), the site is bathed by modified Lower Circumpolar Deepwater (LCDW) and therefore will be useful to monitor past changes in this water mass. Because this site is close to Site U1488 but at ~900 m deeper water depth, comparing results from these two sites also offers the opportunity to investigate potential diagenetic effects of foraminifer geochemical proxy records. High-resolution interstitial water sampling at this site will be used for geochemical reconstructions of the deep Pacific water mass (δ18O, salinity, and seawater chemistry) during the Last Glacial Maximum (LGM).