Meeting

Hydrothermal circulation and the melt plumbing system at slow spreading ridges

Hydrothermal circulation and the melt plumbing system at slow spreading ridges

 

Mathilde Cannat

Hydroacoustic seismicity along oceanic transform faults: Contrasts between the East Pacific Rise and Mid-Atlantic Ridge

Hydroacoustic seismicity along oceanic transform faults: Contrasts between the East Pacific Rise and Mid-Atlantic Ridge

Tingting Zheng1, Jian Lin1, 2, 3, Qiu Zhong3

Temporal and spatial variations in seismicity of fast-slipping oceanic transform faults at the East Pacific Rise

Qiu Zhong1, Jian Lin1, 2, 3, Tingting Zheng3

Characterization of chemical energy resources used by chemosynthetic bivalves in present and fossil hydrothermal systems using stable isotope signature of shells

Lartaud F.1, Nedoncelle K. 1, de Rafelis M.2, Le Bris N. 1

1 UPMC Univ Paris 06, CNRS UMR 8222, LECOB, Observatoire Océanologique, F-66650 Banyuls-sur mer, France.

Mineralogical Study of Hydrothermal Sulfide in the Okinawa Through

The study of hydrothermal sulfide in the Okinawa Through can help to uncover the hydrothermal mineralization characteristics of back-arc basins that are in the early expansion. In this study, the mineralogical characteristics of the sulfide from the midland and south of the Okinawa Through are carried out. First of all, using optical microscope and electron microscope to confirm the mineral composition, characteristics of crystal shape, syntagmatic relation and crystallization order. Analyze the chemical composition in virtue of electron probe.

Near-seafloor Magnetics using AUV URASHIMA at the Tarama and Irabu Hydrothermal Fields, Okinawa Trough

Magnetic mapping is of increasing interest in studies of seafloor hydrothermal systems because such data can promote the understanding of the location and spatial extent of hydrothermal alteration zones. Previous studies reported both reduced and enhanced magnetization at hydrothermal fields of different tectonic settings, suggesting that the destruction and production of magnetic minerals are controlled by geological and tectonic background.

The Crustal Structure of the Southwest Indian Ridge(49°17'E–50°49'E) ——3D wide-angle seismic experiment

JiabiaoLi, AiguoRuan, XiongweiNiu, Minhui Zhao,Xuelin Qiu, Y. John Chen,Hanchao Jian

1) Second Institute of Oceanography, State Oceanic Administration, Hangzhou 3100122) South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301

3)Institute of Theoretical and Applied Geophysics, School of Earth and Space Science, Peking University, Beijing 100871 

Neotectonics in the Southwest Sub-basin, South China Sea: Constraints from multi-channel seismic data and IODP Expedition 349

The neotectono-sedimentary processes of the South China Sea abyssal basin have long been a puzzling issue and are still debated because of the lack of drilling evidence. In this study, we interpreted four multi-channel seismic profiles across the Southwest Sub-basin (SWSB), integrated for stratigraphic correlation with new drilling data from the Integrated Ocean Discovery Program (IODP) 349 Expedition. Results show that the Neogene sediments are divided into four stratigraphic units, each with distinctive seismic reflectors.