Volume 505S, 2026 | IODP³ Expedition 505S: ENIGMA: ExploratioN Into a Global early Miocene Anomaly
The early Miocene interval from 23–17 million years ago (Ma) has remained relatively understudied compared to the global climate change events occurring during the preceding Oligocene–Miocene Boundary (23.03 Ma) and subsequent Miocene Climate Optimum (~17–14.7 Ma). However, recent work suggests that this interval is host to dramatic changes in marine food webs, oceanic oxygenation, and possibly cryosphere dynamics.
The International Ocean Drilling Programme (IODP3) Expedition 505S will perform a comprehensive analysis of the fossil and abiotic components of marine sediments spanning the Atlantic Ocean basin to investigate the Earth system changes associated with the early Miocene. Through the appraisal of legacy records, alongside the generation of new data and modelling outputs, Expedition 505S seeks to synthesize a basin-wide chronostratigraphic framework throughout the Atlantic in which to assess the timing, magnitude, and consequences of palaeoceanographic change.
This volume of the Proceedings of the International Ocean Drilling Programme includes the Scientific Prospectus and scientific results of IODP3 Expedition 505S.
Volume 505S, 2026 | IODP³ Expedition 505S: ENIGMA: ExploratioN Into a Global early Miocene Anomaly
The early Miocene interval from 23–17 million years ago (Ma) has remained relatively understudied compared to the global climate change events occurring during the preceding Oligocene–Miocene Boundary (23.03 Ma) and subsequent Miocene Climate Optimum (~17–14.7 Ma). However, recent work suggests that this interval is host to dramatic changes in marine food webs, oceanic oxygenation, and possibly cryosphere dynamics.
The International Ocean Drilling Programme (IODP3) Expedition 505S will perform a comprehensive analysis of the fossil and abiotic components of marine sediments spanning the Atlantic Ocean basin to investigate the Earth system changes associated with the early Miocene. Through the appraisal of legacy records, alongside the generation of new data and modelling outputs, Expedition 505S seeks to synthesize a basin-wide chronostratigraphic framework throughout the Atlantic in which to assess the timing, magnitude, and consequences of palaeoceanographic change.
This volume of the Proceedings of the International Ocean Drilling Programme includes the Scientific Prospectus and scientific results of IODP3 Expedition 505S.
