DOI: 10.1038/s41561-018-0064-1
论文题名: Modification of the Western Gondwana craton by plume-lithosphere interaction
作者: Hu J. ; Liu L. ; Faccenda M. ; Zhou Q. ; Fischer K.M. ; Marshak S. ; Lundstrom C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期: 3 起始页码: 203
结束页码: 210
语种: 英语
Scopus关键词: Calluna vulgaris
英文摘要: The longevity of cratons is generally attributed to persistence of neutrally-to-positively buoyant and mechanically strong lithosphere that shields the cratonic crust from underlying mantle dynamics. Here we show that large portions of the cratonic lithosphere in South America and Africa, however, experienced significant modification during and since the Mesozoic era, as demonstrated by widespread Cretaceous uplift and volcanism, present-day high topography, thin crust, and the presence of seismically fast but neutrally buoyant upper-mantle anomalies. We suggest that these observations reflect a permanent increase in lithospheric buoyancy due to plume-triggered delamination of deep lithospheric roots during the Late Cretaceous and early Cenozoic periods. Lithosphere in these regions has been thermally reestablished since then, as confirmed by its present-day low heat flow, high seismic velocities and realigned seismic anisotropy. We conclude that the original lowermost cratonic lithosphere is compositionally denser than the asthenospheric mantle and can be removed when perturbed by underlying mantle upwelling. Therefore, it is the buoyancy of the upper lithosphere that perpetuates stabilization of cratons. © 2018 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105603
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Geology, University of Illinois at Urbana-Champaign, Champaign, IL, United States; Department of Geoscience, University of Padova, Padova, Italy; Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, United States
Recommended Citation:
Hu J.,Liu L.,Faccenda M.,et al. Modification of the Western Gondwana craton by plume-lithosphere interaction[J]. Nature Geoscience,2018-01-01,11(3)