Meeting

InterRidge Bursary to Panama Basin and preliminary bathymetric interpretation

The InterRidge cruise bursary is aimed at post graduate students seeking cruise experience. This provides a vital opportunity for training in data collection and experience of scientific principles in action.  The bursary allowed me to join Dr. R. Hobbs’ JC114 cruise to the Panama basin to study the Costa Rica and Ecuador ridges. Subsequently after the cruise I became involved in the OSCAR project, ‘Oceanographic and Seismic Characterisation of heat dissipation and alteration by hydrothermal fluids at an Axial Ridge’.

Review of Os isotope variation and model ages in ablyssal peridotite

Abyssal peridotites are of great interest to geoscientists because they provide direct information about the present-day Earth's mantle. Os isotope systems in abyssal peridotites are also interesting because Os is a highly siderophile and compatible element and so concentrates in the core in preference to the mantle, and in the mantle in preference to the crustal materials. In addition, Os in abyssal peridotites is not susceptible to metasomatism and alteration by sea water.

Systematic variations in morphological characteristics of global transform faults

We quantify systematic variations in morphological characteristics of global transform faults and investigate their dependence on spreading rate, local magma supply, and other tectonic variables. Detailed analyses were conducted on 78 transform faults where high-resolution multibeam bathymetry and other geophysical data are available.

Tamu Massif-Largest Volcano on Earth-within Shatsky Rise Oceanic Plateau Formed by Mantle Plume-Mid-Ocean Ridge Interaction?

Jinchang Zhang1,2, William W. Sager2,3, Jun Korenaga4

 

1South China Sea Institute of Oceanology, Chinese Academy of Sciences, China

2Texas A&M University, College Station, Texas, USA

3University of Houston, Houston, Texas, USA

A New Method of Automatic SVP Optimization Based on MOV Algorithm

We applied the maximum offset of sound velocity algorithm to sound velocity profile streamlining and optimization to overcome multi-beam survey and data processing efficiency problems. The impact of sound velocity profile streamlining on sounding data accuracy is evaluated. By automatically optimizing the threshold, the reduction rate of sound velocity profile data can reach over 90% and the standard deviation percentage error of sounding data can be controlled to within 0.1%.

Rare-earth-elements characteristics of the hydrothermal sulfide in the Central Indian Ridge

 A new method is proposed to identify automatically the foot of the continental slope (FOS) based on the integrated analysis of topographical profiles. First, it simplifies the topographic profiles based on second derivative extremum points and the Douglas-Peucker algorithm, and calculates a second-order derivative of the original profiles and the D-P profiles. Then, seven steps are used to simplify the original profiles and determine the slope gradient, water depth and second derivative values of data points.

Geochemical features of the hydrothermal sulfide on the Southern Mid-Atlantic Ridge near 15°S

With a systematic study on mineralogy of the three stations’ sulfide samples dredged from the seafloor hydrothermal field near 15°S Southern Mid-Atlantic Ridge, geochemical features of these sulfides are also described in detail. Bulk chemical analyses of sulfide samples were obtained using X-ray Fluorescence (XRF) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The sulfides on the Southern Mid-Atlantic Ridge (SMAR) near 15°S can be divided into three types: Fe-rich sulfide, Fe-Cu-rich sulfide and Fe-Zn-rich sulfide, and enrich Fe, Zn and Cu concentrations successively.

TPEC Algorithm and its Application in Niao Chao Hill —China’s first international undersea feature naming

In recent years, Sub-Committee on Undersea Feature Names (SCUFN) has been conducting deliberations on naming undersea features that are entirely or mainly (more than 50%) outside the external limits of the territorial sea, adhering to the principles of not involving sovereignty dispute between countries. In order to participate in undersea feature naming and embody the international responsibility, obligation and influence of the State, Chinese State Oceanic Administration submitted seven undersea name proposals to SCUFN in 2011 for the first time.

Zn isotope composition in hydrothermal systems on the mid-ocean ridge and its implication for geochemical cycling of Zinc

Hydrothermal systems play an important role on the oceanic biogeochemical cycles of Zn and its isotopes. However, for the Zn isotopic systems in hydrothermal systems we know too little of the distribution of Zn isotopes in variable hydrothermal products and its impact on modern oceanic mass balance. We have measured Zn isotopes in hydrothermal products such as oxidation products of chimney sulfides and hydrothermal sediments from the active hydrothermal field on the Mid-Atlantic Ridge in order to better understand the oceanic biogeochemical cycles of Zn isotopes.

Ren Mengyi Metallogenic information extraction and quantitative prediction process of seafloor polymetallic sulfide resources in the Southwest Indian Ocean

Seafloor polymetallic sulfide resources exhibit significant development potential. In 2011, the China Ocean Mineral Resources Research and Development Association (COMRA) and International Seabed Authority (ISA) signed a contract for the exploration of 10,000 km2 of a hydrothermal sulfide area located on the Southwest Indian Ridge (SWIR). According to the Regulations, China will have to relinquish, respectively, 50 % and 75 % of the contract area within 8 and 10 years. However, an exploration of the seafloor hydrothermal sulfide deposits in China remains in the initial stage.