俯冲带热结构的动力学模型研究
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摘要
俯冲板块在俯冲过程中与周围地幔不断发生热交换,该热演化过程主要由热传导和平流物质交换两种作用构成.俯冲带热结构的演化是控制俯冲过程中物理化学性质转变的决定性因素之一,直接影响我们对矿物脱水、岩石部分熔融、岛弧火山喷发以及俯冲带地震等关键地质现象的理解.对俯冲带热结构的动力学模型研究主要分为解析方法和数值方法两种.解析模型能够从物理上给出对热结构具有最重要影响的控制因素,比如俯冲板块的年龄、速度和角度、剪切应力以及热传导系数等.数值模型能够进一步给出解析模型难以处理的各种复杂因素的影响,比如地幔楔的黏性变化、俯冲板块与周围地幔的耦合过程、与矿物岩石学的结合等.将模型结果实际应用于各俯冲带时由于各种影响因素很多,因此对俯冲带热结构的限定是一个非常复杂的过程.随着地球物理与地球化学各种定量观测手段的进步,将能够给出更多对俯冲带热结构的约束条件,进而更合理的解释与俯冲带相关的地质现象.
引文
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