globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2097
Mercury's global contraction much greater than earlier estimates
Author: Byrne P.K.; Klimczak C.; Sengör A.M.C.; Solomon S.C.; Watters T.R.; Hauck S.A.
Source Publication: Nature Geoscience
ISSN: 17520894
Publishing Year: 2014
Volume: 7, Issue:4
pages begin: 301
pages end: 307
Language: 英语
Scopus Keyword: mantle convection ; Mercury (planet) ; planetary landform ; planetary surface ; spacecraft ; tectonic plate ; tectonic structure
English Abstract: Mercury, a planet with a lithosphere that forms a single tectonic plate, is replete with tectonic structures interpreted to be the result of planetary cooling and contraction. However, the amount of global contraction inferred from spacecraft images has been far lower than that predicted by models of the thermal evolution of the planetâ €™ s interior. Here we present a synthesis of the global contraction of Mercury from orbital observations acquired by the MESSENGER spacecraft. We show that Mercuryâ €™ s global contraction has been accommodated by a substantially greater number and variety of structures than previously recognized, including long belts of ridges and scarps where the crust has been folded and faulted. The tectonic features on Mercury are consistent with models for large-scale deformation proposed for a globally contracting Earth -now obsolete -that pre-date plate tectonics theory. We find that Mercury has contracted radially by as much as 7 km, well in excess of the 0.8-3 km previously reported from photogeology and resolving the discrepancy with thermal models. Our findings provide a key constraint for studies of Mercuryâ €™ s thermal history, bulk silicate abundances of heat-producing elements, mantle convection and the structure of its large metallic core. © 2014 Macmillan Publishers Limited. All rights reserved.
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Document Type: 期刊论文
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Affiliation: Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, United States; Lunar and Planetary Institute, Universities Space Research Association, Houston, TX 77058, United States; Department of Geology, Faculty of Mines and the Eurasia Institute of Earth Sciences, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States; Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, United States; Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, OH 44106, United States

Recommended Citation:
Byrne P.K.,Klimczak C.,Sengör A.M.C.,et al. Mercury's global contraction much greater than earlier estimates[J]. Nature Geoscience,2014-01-01,7(4)
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