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Mantle melting factors and amagmatic crustal accretion of the gakkel ridge, Arctic Ocean

Acta Oceanologica Sinica 2015年第6期34卷 42-48页

作者： ZHANG Tao GAO Jinyao CHEN Mei YANG Chunguo SHEN Zhongyan ZHOU Zhiyuan WU Zhaocai SUN Yunfan Key Laboratory of Submarine Geosciences State Oceanic Administration Second Institute of Oceanography State Oceanic Administration East China Construction Engineering Corporation of Zhejiang School of Ocean and Earth Science Tongji University

Spreading rate is a primary factor of mantle melting and tectonic behavior of the global mid-ocean ridges. The spreading rate of the gakkel ridge decreases gradually from west to east. However, the gakkel ridge can be divided into four thick-and-thin zones with varying crustal thicknesses along ridge axis. This phenomenon indicates that mantle melting of the gakkel ridge is not a simple function of spreading rate. Mantle temperature, water content, mantle composition, and other factors are important in crustal accretion processes. Based on gravity-derived crustal thickness and wet melting model, we estimate that the mantle potential temperatures of the four zones are 1 270, 1 220, 1 280, and 1 280℃ （assuming that mantle water content equals to global average value）, with corresponding mantle water contents of 210, 0, 340, and 280 mg/kg （assuming that mantle potential temperature is 1 260℃）, respectivly. The western thinned crust zone is best modeled with low mantle temperature, whereas the other zones are mainly controlled by the enhanced conduction caused by the slower spreading rate. Along the gakkel ridge, the crustal thickness is consistent with rock samples types. Predominated serpentinized peridotite and basalt are found in the area with crustal thickness 〈1.5 km and 〉2.5 km, respectively. The rock samples are including from basalt to peridotite in the area with crustal thickness between 1.5 and 2.5 km. Based on this consistency, the traditional magmatic accretion zone accounted for only 44% and amagmatic accretion accounted for 29% of the gakkel ridge. The amagmatic accretion is a significant characteristic of the ultra-slow spreading ridge.

关键词： gakkel ridge residual mantle bouguer anomaly crustal thickness wet melting amagmatic accretion

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