Morphological types in the Deccan Volcanic Province, India: implications for emplacement dynamics of continental flood basalts
Morphological types in the Deccan Volcanic Province, India: implications for emplacement dynamics of continental flood basalts
复制标题
印度德干火山省的形态类型：对大陆溢流玄武岩侵位动态的影响
DOI：
10.1144/sp518-2020-246
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Makarand S. Bodas
中科院分区：
文献类型：
--
作者：
V. S. Kale;Gauri Dole;Shilpa Patil Pillai;Poushali Chatterjee;Makarand S. Bodas
摘要我们回顾和比较了大陆玄武岩熔岩的形态，并以德干火山区为例，整理了它们的内部结构和相互组合，并进行了比较。熔岩在绝热(快速发展)地壳内的内生迁移机制为溢流玄武岩中熔岩的扩散提供了有效的方式。熔岩流的增长可以通过一次挤压或多个内生侵位脉冲实现，从而使熔岩有效地扩散到大片区域并增厚。我们发现，波瓣的形态表现了熔岩对几个参数(包括体积侵位速度、衬底地形、粘度、蒸气损失等)的响应。它控制着玄武岩熔岩开始在地表扩散后的动力学和冷却历史。熔岩流从一种形态到另一种形态的横向转变证明了熔岩动力学和流变学对它们所在的局部系统变化的交互反应。这些岩浆的形态并不是从“áā和p-ā铲状熔岩类型”演化而来，而是作为熔岩扩散和冷却过程中相互作用变化的参数级数演化而来。对叶状物、流动和流动场的分级识别、形态(及其横向转变或连续性)的绘制与堆积模式相结合，为合理绘制溢流玄武岩的地层图提供了火山学框架。这种对洪水玄武岩省份的建筑记录将导致对其喷发历史的强有力的模型。
Abstract We review and compare morphologies from continental basaltic lavas, using examples from the Deccan Volcanic Province to compile their internal configurations and mutual associations and compare them. The mechanism of endogenous transfer of lava within an insulating (rapidly developed) crust provides an efficient mode of dispersal of the molten lava in flood basalts. The growth of the lava flow can be achieved by a single extrusion or by multiple pulses of endogenous emplacement that enable the lava to efficiently spread over large areas and thicken. We show that the morphology of a lobe manifests the response of the molten lava to several parameters (including volumetric rate of emplacement, substrate topography, viscosity, vapour loss, etc.) that govern the dynamics and cooling history of basaltic lava after it starts to spread on the surface. The lateral transition from one morphology to another within lobes of a lava flow is a testimony to the interactive response of the lava dynamics and rheology to variation in the local systems in which they were emplaced. The morphologies do not evolve as rigid partitioned categories from ‘áā and pāhoehoe lava types' but as parametric progression of interactive variations in the spreading and cooling lava. A hierarchical recognition of lobes, flows and flow fields and mapping of the morphology (and their lateral transition or continuity) combined with the stacking patterns provides the volcanological framework for a sound stratigraphic mapping of flood basalts. Such an architectural documentation of flood basalt provinces will lead to robust models of their eruptive histories.
影响因子：
2.9
作者：
L. Percival;H. Jenkyns;T. Mather;A. Dickson;S. Batenburg;M. Ruhl;S. Hesselbo;R. Barclay;I. Jarvi
通讯作者：
L. Percival;H. Jenkyns;T. Mather;A. Dickson;S. Batenburg;M. Ruhl;S. Hesselbo;R. Barclay;I. Jarvi
影响因子：
56.9
作者：
Sprain, Courtney J.;Renne, Paul R.;Mittal, Tushar
通讯作者：
Mittal, Tushar
影响因子：
5.3
作者：
Kolzenburg, S.;Di Genova, D.;Dingwell, D. B.
通讯作者：
Dingwell, D. B.