Geochemical characteristics of submarine rhyolitic pumice from Andaman subduction zone: Inferences on magmatism and tectonics of north‐eastern Indian Ocean
Abstract. Drilling and coring during IODP Expedition 362 in the eastern Indian Ocean
encountered probably the largest wood fragment ever recovered in scientific
ocean drilling. The wood is Late Miocene in age and buried beneath
∼800 m of siliciclastic mud and sand of the Bengal–Nicobar
Fan. The wood is well preserved. Possible origins include the hinterland to
the north, with sediment transported as part of the submarine fan sedimentary
processes, or the Sunda subduction zone to the east, potentially as a
megathrust tsunami deposit.
AbstractTwenty-six taxa of Trichotheliaceae are reported from rock, bark and leaves on Christmas Island in the north-eastern Indian Ocean. Trichothelium oceanicum P. M. McCarthy sp. nov., a common foliicolous species, is described.
Although researchers have investigated the impact of Indian Ocean Dipole (IOD) phases on human lives, only a few have examined such impacts on fisheries. In this study, we analyzed the influence of negative (positive) IOD phases on chlorophyll a (Chl-a) concentrations as an indicator of phytoplankton biomass and small pelagic fish production in the eastern Indian Ocean (EIO) off Java. We also conducted field surveys in the EIO off Palabuhanratu Bay at the peak (October) and the end (December) of the 2019 positive IOD phase. Our findings show that the Chl-a concentration had a strong and robust association with the 2016 (2019) negative (positive) IOD phases. The negative (positive) anomalous Chl-a concentration in the EIO off Java associated with the negative (positive) IOD phase induced strong downwelling (upwelling), leading to the preponderant decrease (increase) in small pelagic fish production in the EIO off Java.
New record of Bembradium magnoculum (Actinopterygii: Scorpaeniformes: Plectrogeniidae) from the north-eastern Indian Ocean