globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1736
论文题名:
A Precambrian microcontinent in the Indian Ocean
作者: Torsvik T.H.; Amundsen H.; Hartz E.H.; Corfu F.; Kusznir N.; Gaina C.; Doubrovine P.V.; Steinberger B.; Ashwal L.D.; Jamtveit B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:3
起始页码: 223
结束页码: 227
语种: 英语
Scopus关键词: crustal thickness ; fragmentation ; geophysical method ; lava ; lithosphere ; magmatism ; mantle plume ; Precambrian ; uranium-lead dating ; zircon ; Indian Ocean ; Seychelles
英文摘要: The Laccadive-Chagos Ridge and Southern Mascarene Plateau in the north-central and western Indian Ocean, respectively, are thought to be volcanic chains formed above the Réunion mantle plume1 over the past 65.5 million years2,3. Here we use U-Pb dating to analyse the ages of zircon xenocrysts found within young lavas on the island of Mauritius, part of the Southern Mascarene Plateau. We find that the zircons are either Palaeoproterozoic (more than 1,971 million years old) or Neoproterozoic (between 660 and 840 million years old). We propose that the zircons were assimilated from ancient fragments of continental lithosphere beneath Mauritius, and were brought to the surface by plume-related lavas. We use gravity data inversion to map crustal thickness and find that Mauritius forms part of a contiguous block of anomalously thick crust that extends in an arc northwards to the Seychelles. Using plate tectonic reconstructions, we show that Mauritius and the adjacent Mascarene Plateau may overlie a Precambrian microcontinent that we call Mauritia. On the basis of reinterpretation of marine geophysical data 4, we propose that Mauritia was separated from Madagascar and fragmented into a ribbon-like configuration by a series of mid-ocean ridge jumps during the opening of the Mascarene ocean basin between 83.5 and 61 million years ago. We suggest that the plume-related magmatic deposits have since covered Mauritia and potentially other continental fragments. Copyright © 2013 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106849
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: Physics of Geological Processes, University of Oslo, 0316 Oslo, Norway; Center of Advanced Study, Norwegian Academy of Science and Letters, 0271 Oslo, Norway; Geodynamics, NGU, N-7491 Trondheim, Norway; Geosciences, University of Oslo, 0316 Oslo, Norway; School of Geosciences, University of Witwatersrand, Wits 2050, South Africa; EPX, Jacob Aalls Gate 44b, N-0364 Oslo, Norway; Det norske oljeselskap, Postboks 2070 Vika, 0125 Oslo, Norway; Department of Earth and Ocean Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom; Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Heinrich-Mann-Allee 18/19, 14473 Potsdam, Germany; Centre for Earth Evolution and Dynamics, University of Oslo, 0316 Oslo, Norway

Recommended Citation:
Torsvik T.H.,Amundsen H.,Hartz E.H.,et al. A Precambrian microcontinent in the Indian Ocean[J]. Nature Geoscience,2013-01-01,6(3)
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