气候变化领域集成服务门户(CCPortal): A thick crustal block revealed by reconstructions of early Mars highlands

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DOI	10.1038/s41561-019-0512-6
	A thick crustal block revealed by reconstructions of early Mars highlands
	Bouley S.; Keane J.T.; Baratoux D.; Langlais B.; Matsuyama I.; Costard F.; Hewins R.; Payré V.; Sautter V.; Séjourné A.; Vanderhaeghe O.; Zanda B.
发表日期	2020
ISSN	17520894
卷号	13 期号:2
英文摘要	The global-scale crustal structure of Mars is shaped by impact basins, volcanic provinces, and a hemispheric dichotomy with a thin crust beneath the northern lowlands and a thick crust beneath the southern highlands. The southern highlands are commonly treated as a coherent terrain of ancient crust with a common origin and shared geologic history, plausibly originating from a giant impact(s) or a hemispheric-scale mantle upwelling. Previous studies have quantified the contribution of volcanism to this crustal structure; however, the influence of large impacts remains unclear. Here we present reconstructions of the past crustal thickness of Mars (about 4.2 Gyr ago) where the four largest impact basins (Hellas, Argyre, Isidis and Utopia) are removed, assuming mass conservation, as well as the main volcanic provinces of Tharsis and Elysium. Our reconstruction shows more subdued crustal thickness variations than at present, although the crustal dichotomy persists. However, our reconstruction reveals a region of discontinuous patches of thick crust in the southern highlands associated with magnetic and geochemical anomalies. This region, corresponding to Terra Cimmeria–Sirenum, is interpreted as a discrete crustal block. Our findings suggest that the southern highlands are composed of several crustal blocks with different geological histories. Such a complex architecture of the southern highlands is not explained by existing scenarios for crustal formation and evolution. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	crustal evolution; crustal structure; crustal thickness; mantle; Mars; reconstruction; upland region; volcanism; Andalucia; Huelva [Andalucia]; Spain; Tharsis
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124515
作者单位	GEOPS – Géosciences Paris Sud, Univ. Paris-Sud, CNRS, Université Paris-Saclay, Orsay, France; IMCCE – Observatoire de Paris, CNRS-UMR 8028, Paris, France; California Institute of Technology, Pasadena, CA, United States; Geosciences Environnement Toulouse, UMR 5563 CNRS, IRD & Université de Toulouse, Toulouse, France; Laboratoire de Planétologie et Géodynamique, CNRS UMR 6112, Université de Nantes, Université d’Angers, Nantes, France; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC) – Sorbonne Université- Muséum National d’Histoire Naturelle, UPMC Université Paris 06, UMR CNRS 7590, IRD UMR 206, Paris, France; Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX, United States
推荐引用方式 GB/T 7714	Bouley S.,Keane J.T.,Baratoux D.,et al. A thick crustal block revealed by reconstructions of early Mars highlands[J],2020,13(2).
APA	Bouley S..,Keane J.T..,Baratoux D..,Langlais B..,Matsuyama I..,...&Zanda B..(2020).A thick crustal block revealed by reconstructions of early Mars highlands.Nature Geoscience,13(2).
MLA	Bouley S.,et al."A thick crustal block revealed by reconstructions of early Mars highlands".Nature Geoscience 13.2(2020).