摘要
马里亚纳弧前蛇纹岩泥火山是认识板块俯冲作用的直接窗口,为了解该类型泥火山形成的动力学过程,针对Fantangisña蛇纹岩泥火山,建立了形成动力学数值模型。模拟结果表明,蛇纹岩泥火山的泥浆源深度约8.4 km,蛇纹石化地幔厚度约为4 km,泥浆源区超压约为1.91×10^(7)Pa,泥火山流体运移通道半径约为1.12 m,平均流速约为66.00×10^(4)m^(3)/a,泥火山累计喷发活动的时间约21万年,占整个Fantangisña蛇纹岩泥火山存在时间的2.0%。本文计算结果为探究马里亚纳弧前深部上地幔蛇纹石化特征提供了基础数据,丰富了马里亚纳弧前蛇纹岩泥火山形成的动力学。
The serpentinite mud volcanoes in the forearc of the Mariana Arc serve as direct windows to comprehend the process of plate subduction.In order to understand the dynamic process of the formation of this type of mud volcanoe,a numerical model of the formation dynamics has been established specifically for the Fantangisña serpentinite mud volcano.The simulation results suggest that the mud slurry for the Fantangisña mud volcano is derived from a sourec region approximately 8.4 km in depth,underlying an about 4 km thick serpentinized mantle,with the pressure of about 1.91×10^(7) Pa.The mud slurry is migrated through a migration channel with the radius of about 1.12 m at the average flow velocity of approximately 66.00×10^(4) m^(3)/a,and the cumulative eruption activity time of about 210 kys accounting for 2.0%of the total existence time of the Fantangisña serpentinite mud volcano.The computational results presented in this paper provide foundational data for investigating the serpentinization features of the upper mantle in deep part of the Mariana Arc′s forearc region and enhance the understanding for the formation dynamics of serpentinite mud volcanoes in this area.
作者
李敏
陈琳莹
陈多福
LI Min;CHEN Lin-ying;CHEN Duo-fu(College of Oceanography and Ecological Science,Shanghai Ocean University,Shanghai 201306,China)
出处
《矿物岩石地球化学通报》
北大核心
2025年第3期557-565,共9页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金资助项目(42176069)。
关键词
蛇纹岩泥火山
形成动力学模型
泥源埋藏深度
间歇性
马里亚纳海沟
serpentinite mud volcanoes
formation dynamic model
burial depth of mud source
intermittency
Mariana trench
