globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2474
论文题名:
In situ evidence for continental crust on early Mars
作者: Sautter V.; Toplis M.J.; Wiens R.C.; Cousin A.; Fabre C.; Gasnault O.; Maurice S.; Forni O.; Lasue J.; Ollila A.; Bridges J.C.; Mangold N.; Le Mouélic S.; Fisk M.; Meslin P.-Y.; Beck P.; Pinet P.; Le Deit L.; Rapin W.; Stolper E.M.; Newsom H.; Dyar D.; Lanza N.; Vaniman D.; Clegg S.; Wray J.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:8
起始页码: 605
结束页码: 609
语种: 英语
Scopus关键词: alkalinity ; basalt ; chemical composition ; continental crust ; continental shelf ; data set ; diorite ; feldspar ; granodiorite ; magmatism ; Mars ; Martian atmosphere ; meteoric water ; quartz ; Southern Hemisphere
英文摘要: Understanding of the geologic evolution of Mars has been greatly improved by recent orbital, in situ and meteorite data, but insights into the earliest period of Martian magmatism (4.1 to 3.7 billion years ago) remain scarce. The landing site of NASA's Curiosity rover, Gale crater, which formed 3.61 billion years ago within older terrain, provides a window into this earliest igneous history. Along its traverse, Curiosity has discovered light-toned rocks that contrast with basaltic samples found in younger regions. Here we present geochemical data and images of 22 specimens analysed by Curiosity that demonstrate that these light-toned materials are feldspar-rich magmatic rocks. The rocks belong to two distinct geochemical types: alkaline compositions containing up to 67 wt% SiO 2 and 14 wt% total alkalis (Na 2 O + K 2 O) with fine-grained to porphyritic textures on the one hand, and coarser-grained textures consistent with quartz diorite and granodiorite on the other hand. Our analysis reveals unexpected magmatic diversity and the widespread presence of silica- and feldspar-rich materials in the vicinity of the landing site at Gale crater. Combined with the identification of feldspar-rich rocks elsewhere and the low average density of the crust in the Martian southern hemisphere, we conclude that silica-rich magmatic rocks may constitute a significant fraction of ancient Martian crust and may be analogous to the earliest continental crust on Earth. © 2015 Macmillan Publishers Limited.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106329
Appears in Collections:气候减缓与适应
科学计划与规划

Files in This Item:

There are no files associated with this item.


作者单位: IMPMC, Muséum d'Histoire Naturelle, Paris, France; IRAP, Toulouse, France; Los Alamos National Laboratory, Los Alamos, New Mexico, United States; GeoRessources-Université de Lorraine, Vandoeuvre les Nancy, France; Chevron Energy Technology Company, Houston, TX, United States; Space Research Centre, Department of Physics and Astronomy, University of Leicester, United Kingdom; LPG, BP 92208, Nantes, France; College of Earth, Ocean, and Atmospheric SciencesOregon, United States; Institut de Planétologie et d'Astrophysique, BP 53, Grenoble, France; Caltech, Pasadena, CA, United States; Institute of Meteoritics, Albuquerque, New Mexico, United States; Mount Holyoke College, South Hadley, MA, United States; Planetary Science Institute, Tucson, AZ, United States; Georgia Institute of Technology, Atlanta, GA, United States

Recommended Citation:
Sautter V.,Toplis M.J.,Wiens R.C.,et al. In situ evidence for continental crust on early Mars[J]. Nature Geoscience,2015-01-01,8(8)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Sautter V.]'s Articles
[Toplis M.J.]'s Articles
[Wiens R.C.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Sautter V.]'s Articles
[Toplis M.J.]'s Articles
[Wiens R.C.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Sautter V.]‘s Articles
[Toplis M.J.]‘s Articles
[Wiens R.C.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.