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DOI | 10.1038/s41561-018-0138-0 |
Archaean continental spreading inferred from seismic images of the Yilgarn Craton | |
Calvert, Andrew J.1; Doublier, Michael P.2 | |
2018-07-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:7页码:526-U93 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; Australia |
英文摘要 | On the early Earth, oceanic plateaux similar to present-day Iceland are thought to have evolved into less dense microcontinents as they thickened by continued melt intrusion and crustal fractionation. These earliest continents may have been so weak on a hotter Earth that they collapsed laterally in response to thickening by further magmatic growth or tectonic imbrication. This continental spreading is likely to have resulted in the development of pervasive ductile strain fabrics in the deeper crust, which, if preserved, could generate seismic reflections. Here we present seismic images from the ancient core of the Archaean Yilgarn Craton of Australia that reveal shallowly dipping to horizontal reflections that pervade the middle and lower crust. We interpret these reflective fabrics as the result of widespread lateral crustal flow during the late stage of craton evolution approximately 2.66 to 2.61billion years ago, which coincided with the widespread intrusion of high-temperature crustal melts, as thickened early continental crust collapsed. The consequent subsidence of large regions of the upper crust, including volcanic and sedimentary greenstone rocks, in the hanging walls of listric mid-lower crustal ductile flow fabrics caused these rocks to drop beneath the granitic melts rising towards the surface, and did not involve Rayleigh-Taylor instabilities within a mostly mobile crust. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438794800017 |
WOS关键词 | WESTERN-AUSTRALIA ; EASTERN GOLDFIELDS ; SUPERIOR PROVINCE ; GREENSTONE-BELT ; PILBARA-CRATON ; CRUST ; TECTONICS ; EVOLUTION ; TERRANE ; ORIGIN |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35117 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Simon Fraser Univ, Dept Earth Sci, Burnaby, BC, Canada; 2.Geosci Australia, Resources Div, Mineral Syst Branch, Symonston, ACT, Australia |
推荐引用方式 GB/T 7714 | Calvert, Andrew J.,Doublier, Michael P.. Archaean continental spreading inferred from seismic images of the Yilgarn Craton[J]. NATURE GEOSCIENCE,2018,11(7):526-U93. |
APA | Calvert, Andrew J.,&Doublier, Michael P..(2018).Archaean continental spreading inferred from seismic images of the Yilgarn Craton.NATURE GEOSCIENCE,11(7),526-U93. |
MLA | Calvert, Andrew J.,et al."Archaean continental spreading inferred from seismic images of the Yilgarn Craton".NATURE GEOSCIENCE 11.7(2018):526-U93. |
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