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1.INTRODUCTIONThe Okinawa Trough is a spreading hemipelagic back-arc basin between theDonghai shelf of China and the Ryukyu lslands.It extends parallel to the islandson its eastern side and convex to southeast(Fig.1).Since the appearance of plate tectonic as a working hypothesis,people becomemore and more interested in the origin and evolution of island arc.The sedimen-tation,volcanism and history of the discussing trough is closely related to theactivities of the nearby island arc so that it is worth studying.Many scientistshave made their contributions for a long time to the investigation of the trough,including geology,oceanology and geophysics.China started late,but some compr-ehensive researches have been carried out during the several years.This paper isa brief report on the latest two cruises made by the units mentioned under thetitle of this paper.
1.INTRODUCTIONThe Okinawa Trough is a spreading hemipelagic back-arc basin between the Donghai shelf of China and the Ryukyu lslands .It extends parallel to the islandson its eastern side and convex to southeast (Fig. 1) .inceince the appearance of plate tectonic as a working hypothesis, people becomemore and more interested in the origin and evolution of island arc.The sedimen-tation, volcanism and history of the discussing trough is closely related to theactivities of the nearby island arc so that it is worth studying.Many scientistshave made their contributions for a long time to the investigation of the trough, including geology, oceanology and geophysics. China started late, but some compr-ehensive researches have been carried out during the several years.This paper isa brief report on the latest two cruises made by the units mentioned under thetitle of this paper.