The role of Palaeocene magmatism in the tectonic evolution of the Sea of the Hebrides Basin: implications for basin evolution on the NW Seaboard
The role of Palaeocene magmatism in the tectonic evolution of the Sea of the Hebrides Basin: implications for basin evolution on the NW Seaboard
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古新世岩浆作用在赫布里底盆地海构造演化中的作用：对西北沿海盆地演化的影响
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发表时间：
1992
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影响因子：
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通讯作者：
R. England
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文献类型：
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作者：
R. England
英属第三纪火山区岩浆的主量、微量元素和同位素地球化学表明，它们以岩脉形式上升穿过岩石圈，并在莫霍面和上地壳内以岩床形式形成积水。在赫布里底海盆地，离散岩墙群、岩床和正断层的连接系统记录了近地表快速的NE-SW向延伸。在上地壳和莫霍面存在类似的岩墙和岩床系统，可能会通过横向消除应变的垂直变化，消除与深度相关拉伸相关的空间问题，从而影响岩石圈伸展机制。沿沿着西北海岸向盆地注入的大量岩浆会导致局部埋藏，但由于岩石圈在熔融过程中的均衡效应和热膨胀，下沉会被抬升所抵消。上升岩浆的热损失对沉积物的成熟历史的影响可以忽略不计。
Abstract Major, trace element and isotope geochemistry of the magmas of the British Tertiary Volcanic Province suggests they rose through the lithosphere in dykes and ponded as sills at the Moho and within the upper crust. In the Sea of the Hebrides basin a linked system of discrete dyke swarms, sills and normal faults record rapid NE-SW extension at the near surface. The presence of a similar system of dykes and sills within the upper crust and at the Moho could have influenced mechanisms of lithospheric extension by dissipating vertical variations in strain laterally, eliminating space problems associated with depth dependant stretching. The addition of large thicknesses of magma to basins along the NW seaboard would have resulted in local burial, but subsidence would be offset by uplift resulting from isostatic effects and thermal expansion of the lithosphere during melting. Heat loss from rising magma would have a negligible effect on the maturation history of the sediments.