Lithospheric uplift in eastern Gondwana: Evidence for a long-lived mantle plume system?
Lithospheric uplift in eastern Gondwana: Evidence for a long-lived mantle plume system?
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冈瓦纳东部岩石圈隆起：长寿地幔柱系统的证据？
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
R. W. Kent
中科院分区：
文献类型：
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作者：
R. W. Kent
最近的研究表明，裂谷大陆边缘的现代排水系统可能是洪水-玄武岩岩浆活动地区古代岩石圈穹隆的产物。这种抬升被认为反映了裂谷地带普遍存在的镁铁质底侵作用和过量熔体的产生。在这里，我指出，软流圈热异常(烟柱头部)的启动所引起的抬升可以通过形成离散的裂谷结构和长达150英里的持续古排水(沉积物扩散)模式来证明。在火成岩活动和最终的大陆解体开始之前。因此，火山作用是对大陆地幔岩石圈下长期滞留的热柱物质的相对较晚阶段的地球化学反应。
Recent work has demonstrated that modern drainage systems on rifted continental margins may be the product of ancient lithospheric doming in areas of flood-basalt magmatism. This uplift is thought to reflect the existence of widespread mafic underplating and excess melt generation at rift zones. Here I show that uplift due to the initiation of a thermal anomaly (plume head) in the asthenosphere may be evidenced by the formation of discrete rift structures and persistent paleodrainage (sediment dispersal) patterns for up to 150 m.y. prior to the commencement of igneous activity and final continental breakup. Volcanism thus occurs as a comparatively late stage geochemical response to the long-term residence of hot plume material beneath continental mantle lithosphere.