Thermal Structure of Eastern Australia's Upper Mantle and Its Relationship to Cenozoic Volcanic Activity and Dynamic Topography
Thermal Structure of Eastern Australia's Upper Mantle and Its Relationship to Cenozoic Volcanic Activity and Dynamic Topography
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DOI：
10.1029/2021gc009717
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发表时间：
2021-08-01
影响因子：
3.5
通讯作者：
Davies, D. R.
中科院分区：
文献类型：
--
作者：
Ball, P. W.;Czarnota, K.;Davies, D. R.
上地幔结构的时空变化在产生和维持表面地形方面起着重要作用。尽管上地幔结构的地球物理模型已经越来越精致，但就其当今状态和时间演化而言，地质约束存在很少。在澳大利亚东部散发出的新生代内火山岩在降级时量化地幔条件并独立验证地球物理估计值提供了一个重要的机会。这种火山活动分为两类：通过地幔羽流和与年龄无关的省份产生的年龄促进省，这些省份可以通过在岩石圈步骤上的对流上升流延伸而产生。在这项研究中，我们收购并分析了昆士兰州两种省份的78个样本。这些样品被纳入了从传统分析中汇集的澳大利亚新生代火山的综合数据库中。我们使用地球化学建模技术来估计每个省下面的地幔温度和岩石圈厚度。我们的结果表明熔化发生在深度
Spatio-temporal changes of upper mantle structure play a significant role in generating and maintaining surface topography. Although geophysical models of upper mantle structure have become increasingly refined, there is a paucity of geologic constraints with respect to its present-day state and temporal evolution. Cenozoic intraplate volcanic rocks that crop out across eastern Australia provide a significant opportunity to quantify mantle conditions at the time of emplacement and to independently validate geophysical estimates. This volcanic activity is divided into two categories: age-progressive provinces that are generated by the sub-plate passage of mantle plumes and age-independent provinces that could be generated by convective upwelling at lithospheric steps. In this study, we acquired and analyzed 78 samples from both types of provinces across Queensland. These samples were incorporated into a comprehensive database of Australian Cenozoic volcanism assembled from legacy analyses. We use geochemical modeling techniques to estimate mantle temperature and lithospheric thickness beneath each province. Our results suggest that melting occurred at depths