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标题：Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP
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作者：Ross N. Mitchell ; Lei Wu ; J. Brendan Murphy 等
期刊名称：Geoscience Frontiers
印刷版ISSN：1674-9871
出版年度：2020
卷号：11
期号：4
页码：1253-1256
DOI：10.1016/j.gsf.2019.12.002
语种：English
出版社：Elsevier
摘要：Paleogeography can be reconstructed using various crust- or mantle-based reference frames that make fundamentally different assumptions. The various reconstruction models differ significantly in continental paleolongitude, but it has been difficult to assess which models are more valid. We suggest here a “LLSVP test”, where an assumed correlation between present-day large low velocity shear-wave provinces and the paleogeography of supercontinent Pangea at breakup ca. 200 million years ago can be used to assess the relative accuracy of published reconstructions. Closest correlations between continental paleolongitude and the African LLSVP are achieved with mantle-based reference frames (moving hotspots and true polar wander), whereas shallower crust-based reference frames are shown to be invalid. The relative success of mantle-based frames, and thus the importance of the depth of reference frame, supports the notion that mantle convection is largely vertical compared to the horizontal plate motion of tectonics.Graphical abstractDownload : Download high-res image (186KB)Download : Download full-size image
关键词：Palaeogeography;Plate tectonics;LLSVPs;Reference frames