Recent tectonic plate decelerations driven by mantle convection
Recent tectonic plate decelerations driven by mantle convection
复制标题
由地幔对流驱动的近期构造板块减速
DOI：
10.1029/2009gl040224
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发表时间：
2009
影响因子：
5.2
通讯作者：
S. Grand
中科院分区：
文献类型：
--
作者：
A. Forte;R. Moucha;David B. Rowley;S. Quéré;J. Mitrovica;N. Simmons;S. Grand
我们使用地幔流模型探索构造板块速度的近期变化，该模型基于一种新的高分辨率全球层析成像模型，该模型来自全球地震，地球动力学和矿物物理数据集的同时反演。这个板块耦合地幔对流模型包含了一个粘度结构，调和冰川均衡调整和全球对流相关的数据集。对流模型成功地再现了现今的板块速度和全球表面重力和地形约束。我们预测了地幔浮力随时间的变化，这些变化导致了几个主要板块的现今减速，特别是快速移动的太平洋和纳斯卡板块。我们使用空间大地测量和海洋磁异常对构造板块运动的约束来验证这些预测的板块减速的可验证性。这些板块运动学约束被用来确定一个新的全球现今板块减速图，与地幔流预测吻合得很好。
We explore recent changes in tectonic plate velocities using a model of mantle flow that is based on a new high‐resolution global tomography model derived from simultaneous inversions of global seismic, geodynamic and mineral physical data sets. This plate‐coupled mantle convection model incorporates a viscosity structure that reconciles both glacial isostatic adjustment and global convection‐related data sets. The convection model successfully reproduces present‐day plate velocities and global surface gravity and topography constraints. We predict time‐dependent changes in mantle buoyancy that give rise to present‐day decelerations of several major plates, in particular the fast‐moving Pacific and Nazca plates. We verify the plausibility of these predicted plate decelerations using space geodetic and oceanic magnetic anomaly constraints on tectonic plate motions. These plate kinematic constraints are employed to determine a new global map of present‐day plate decelerations that agree well with the mantle flow predictions.