Expedition 369 summary

• Main Authors: Huber, B. T., Hobbs, R. W., Bogus, K. A., Batenburg, S. J., Brumsack, H. -J., do Monte Guerra, R., Edgar, K. M., Edvardsen, T., Garcia Tejada, M. L., Harry, D. L., Hasegawa, T., Haynes, S. J., Jiang, T., Jones, M. M., Kuroda, J., Lee, E. Y., Li, Y. -X., MacLeod, K. G., Maritati, A., Martinez, M., O’Connor, L. K., Petrizzo, M. R., Quan, T. M., Richter, C., Riquier, L., Tagliaro, G. T., Wainman, C. C., Watkins, D. K., White, L. T., Wolfgring, E., Xu, Z.
• Other Authors: R.W. Hobb, B.T. Huber, K.A. Bogu, and the Expedition 369 Scientists, S.J. Batenburg, H.-. Brumsack, R. do Monte Guerra, K.M. Edgar, T. Edvardsen, M.L. Garcia Tejada, D.L. Harry, T. Hasegawa, S.J. Hayne, T. Jiang, M.M. Jone, J. Kuroda, E.Y. Lee, Y.-. Li, K.G. Macleod, A. Maritati, M. Martinez, L.K. O’Connor, M.R. Petrizzo, T.M. Quan, C. Richter, L. Riquier, G.T. Tagliaro, C.C. Wainman, D.K. Watkin, L.T. White, E. Wolfgring, Z. Xu
• Format: Book Part
• Language: English
• Published: International Ocean Discovery Program 2019
• Subjects: International Ocean Discovery Program; IODP; JOIDES Resolution; Expedition 369; Site U1512; Site U1513; Site U1514; Site U1515; Site U1516; Hot Cretaceous Greenhouse; oceanic anoxic event; Mentelle Basin; Naturaliste Plateau; Great Australian Bight; Gondwana breakup; Tasman Gateway; Indonesian Gateway; cyclostratigraphy; carbon isotope excursion; Paleocene/Eocene Thermal Maximum; Eocene greenhouse; Miocene; volcanic rifted margin; nonvolcanic rifted margin; Settore GEO/01 - Paleontologia e Paleoecologia; Settore GEO/02 - Geologia Stratigrafica e Sedimentologica; Settore GEO/07 - Petrologia e Petrografia; Antarctic; Indian; Antarc*
• Online Access: http://hdl.handle.net/2434/651899; https://doi.org/10.14379/iodp.proc.369.101.2019

The tectonic and paleoceanographic setting of the Great Australian Bight (GAB) and the Mentelle Basin (adjacent to Naturaliste Plateau) offered an opportunity to investigate Cretaceous and Cenozoic climate change and ocean dynamics during the last phase of breakup among remnant Gondwana continents. Sediment recovered from sites in both regions during International Ocean Discovery Program Expedition 369 will provide a new perspective on Earth’s temperature variation at subpolar latitudes (60°–62°S) across the extremes of the mid-Cretaceous hot greenhouse climate and the cooling that followed. Basalts and prebreakup sediments were also recovered and will provide constraints regarding the type and age of the Mentelle Basin basement and processes operating during the break up of Gondwana. The primary goals of the expedition were to • Investigate the timing and causes for the rise and collapse of the Cretaceous hot greenhouse climate and how this climate mode affected the climate–ocean system and oceanic biota; • Determine the relative roles of productivity, ocean temperature, and ocean circulation at high southern latitudes during Cretaceous oceanic anoxic events (OAEs); • Investigate potential source regions for deep-water and intermediate-water masses in the southeast Indian Ocean and how these changed during Gondwana breakup; • Characterize how oceanographic conditions at the Mentelle Basin changed during the Cenozoic opening of the Tasman Gateway and restriction of the Indonesian Gateway; and • Resolve questions on the volcanic and sedimentary origins of the Australo-Antarctic Gulf and Mentelle Basin and provide stratigraphic control on the age and nature of the prebreakup successions. Hole U1512A in the GAB recovered a 691 m thick sequence of black claystone ranging from the lower Turonian to the lower Campanian. Age control is primarily based on calcareous nannofossils, but the presence of other microfossil groups provided consistent low-resolution control. Despite the lithologic uniformity, long- and ...