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.

Investigation of turbulent flows and near-bottom hydrothermal plumes at mid-ocean ridges

We investigate the characteristics of turbulent flows within near-bottom hydrothermal plumes at mid-ocean ridges through quantitative analysis of video images from manned submersibles using the Particle Image Velocimetry (PIV) method. High-quality video images of near-bottom hydrothermal vents were selected from the Data Library and Archives of the Woods Hole Oceanographic Institution (WHOI), consisting of multiple examples of vent fields in the Atlantic, Pacific, and Indian Oceans.

Interpretation of the spreading process for the narrow low-latitude inactive ocean basin using deeptow magnetic anomalies: A case study of Southwest Subbasin, South China Sea

Marine magnetic lineation is an important media to interpret the age and spreading process of the oceanic crust. But there are many difficulties to identify the lineation from sea surface observation in a deep and narrow inactive ocean basin located in the low-latitude. Located in such a tectonic position, the spreading history of the Southwest subbasin of the South China Sea became a long time controversy. the deeptow data were able to increase observed anomaly amplitudes by a factor of ~4.