East African topography and volcanism explained by a single, migrating plume

East African topography and volcanism explained by a single, migrating plume
复制标题

东非地形和火山活动由单一的迁移羽流解释

DOI:
10.1016/j.gsf.2020.01.003
复制
发表时间:
2020
影响因子:
8.9
通讯作者:
Müller, Dietmar
Müller, Dietmar
中科院分区:
地球科学1区
文献类型:
--
作者:
Hassan, Rakib;Williams, Simon E.;Gurnis, Michael;Müller, Dietmar

文献摘要

参考文献

被引文献

相似文献

东非的异常地形膨胀和新生代火山活动与地幔柱有关。人们提出了几种模式,其中包括在向东北迁移的非洲板块下面的一个或多个固定羽流,以解释东非岩浆活动的时空分布。我们设计了古地理约束的全球地幔对流模型,并基于下地幔最深处的流动演化,表明阿法尔地幔柱在其一生中一直向南迁移。这些模型表明,移动的阿法尔地幔柱为东非裂谷系统(EARS)向南传播的空间范围提供了一个动态一致的解释,这很难用非洲在过去约45 Myr期间单个或多个固定地幔柱的东北迁移来解释。我们进一步表明,与ear向南传播有关的火山活动的年龄进展与模拟的阿法尔羽流在向东北迁移的非洲板块下向南运动所导致的地表明显热点运动是一致的。这些模型表明,阿法尔烟柱在向南迁移的过程中变得越来越弱,这与地球化学记录中观察到的趋势一致。
Anomalous topographic swells and Cenozoic volcanism in east Africa have been associated with mantle plumes. Several models involving one or more fixed plumes beneath the northeastward migrating African plate have been suggested to explain the space-time distribution of magmatism in east Africa. We devise paleogeographically constrained global models of mantle convection and, based on the evolution of flow in the deepest lower mantle, show that the Afar plume migrated southward throughout its lifetime. The models suggest that the mobile Afar plume provides a dynamically consistent explanation for the spatial extent of the southward propagation of the east African rift system (EARS), which is difficult to explain by the northeastward migration of Africa over one or more fixed plumes alone, over the last≈ 45 Myr. We further show that the age-progression of volcanism associated with the southward propagation of EARS is consistent with the apparent surface hotspot motion that results from southward motion of the modelled Afar plume beneath the northeastward migrating African plate. The models suggest that the Afar plume became weaker as it migrated southwards, consistent with trends observed in the geochemical record.
非洲下方最底层地幔各向异性的 SKS-SKKS 剪切波分裂差异
DOI: --
发表时间: 2019
期刊: Journal of Geophysical Research: Solid Earth
影响因子: --
作者:
M. Reiss;M. Long;N. Creasy
通讯作者: N. Creasy
由于东非隆起,始新世尼罗河开始排水
DOI: 10.1016/j.palaeo.2013.09.014
发表时间: 2013
期刊: Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子: --
作者:
C. Underwood;C. King;É. Steurbaut
通讯作者: É. Steurbaut
DOI: 10.1038/ngeo1432
发表时间: 2012-04
期刊: Nature Geoscience
影响因子: 18.3
作者:
E. Roberts;N. Stevens;P. O’Connor;P. Dirks;M. Gottfried;W. Clyde;R. Armstrong;A. Kemp;S. Hemming
通讯作者: E. Roberts;N. Stevens;P. O’Connor;P. Dirks;M. Gottfried;W. Clyde;R. Armstrong;A. Kemp;S. Hemming
地理信息学:固体地球科学的网络基础设施
DOI: 10.1017/cbo9780511976308
发表时间: 2011
期刊: Paleoceanography
影响因子: --
作者:
G. Keller;C. Baru
通讯作者: C. Baru
东非的热羽流模型和熔体生成:动态建模方法
DOI: 10.1016/j.epsl.2005.04.049
发表时间: 2005
影响因子: 5.3
作者:
Shu;B. Kuo;L. Chiao;P. V. Keken
通讯作者: P. V. Keken