Thickest Oceanic Crust at the Slowest Spreading Gakkel Ridge: Evidences for Active Upwelling along Ultra-slow Spreading Ridges

Tao Zhang1, Jiabiao Li1, Xiongwei Niu1, Weiwei Ding1, Jie Chen2 and the JASMInE team, (1)Second Institute of Oceanography, Ministry of Natural Resources, Key Laboratory of Submarine Geosciences, Hangzhou, China, (2)Institut de Physique du Globe de Paris, Marine Geosciences, Paris, France