globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1771
论文题名:
Continuous exhumation of mantle-derived rocks at the Southwest Indian Ridge for 11 million years
作者: Sauter D.; Cannat M.; Rouméjon S.; Andreani M.; Birot D.; Bronner A.; Brunelli D.; Carlut J.; Delacour A.; Guyader V.; MacLeod C.J.; Manatschal G.; Mendel V.; Ménez B.; Pasini V.; Ruellan E.; Searle R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:4
起始页码: 314
结束页码: 320
语种: 英语
Scopus关键词: detachment fault ; dredging ; faulting ; geomorphology ; hummocky cross-stratification ; lithosphere ; mantle ; mantle structure ; rift zone ; rock ; seafloor ; submarine ; tectonic plate ; volcanic eruption ; volcanism ; Indian Ocean ; Mid-Indian Ridge
英文摘要: The global mid-ocean ridge system, where tectonic plates diverge, is traditionally thought of as the largest single volcanic feature on the Earth. Yet, wide expanses of smooth sea floor in the easternmost part of the Southwest Indian Ridge in the Indian Ocean lacks the hummocky morphology that is typical for submarine volcanism. At other slow-spreading ridges, the sea floor can extend by faulting the existing lithosphere, along only one side of the ridge axis. However, the smooth sea floor in the easternmost Southwest Indian Ridge also lacks the corrugated texture created by such faulting. Instead, the sea floor is smooth on both sides of the ridge axis and is thought to be composed of altered mantle-derived rocks. Here we use side-scan sonar to image the sea floor and dredge samples to analyse the composition of two sections of the Southwest Indian Ridge, between 6205′ E and 6440′ E, where the sea floor formed over the past 11 million years. We show that the smooth floor is almost entirely composed of seawater-altered mantle-derived rocks that were brought to the surface by large detachment faults on both sides of the ridge axis. Faulting accommodates almost 100% of plate divergence and the detachment faults have repeatedly flipped polarity. We suggest that this tectonic process could also explain the exhumation of mantle-derived rocks at the magma-poor margins of rifted continents. © 2013 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106825
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: Institut de Physique du Globe de Strasbourg, UMR CNRS 7516, Université de Strasbourg, 1 rue Blessig, 67084 Strasbourg cedex, France; Equipe de Géosciences Marines, Institut de Physique du Globe de Paris, Univ Paris Diderot, 75005 Paris, France; Laboratoire des Sciences de la Terre, ENS et Université de Lyon, 2 rue Raphael Dubois, 69622 Villeurbanne Cedex, France; Ifremer - Centre de Brest, Département Géosciences Marines, Laboratoire Géochimie-Métallogénie, B.P. 70, 29280 Plouzané, France; Dipartimento di Scienze della Terra, Università di Modena e Reggio Emilia, Lgo St. Eufemia, 19-41100 Modena, Italy; Département de Géologie, Université Jean Monnet, UMR CNRS 6524, 23 rue du Docteur Paul Michelon, 42 023 Saint Etienne cedex 2, France; School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3YE, United Kingdom; OCA-UNS-GéoAzur, UMR CNRS 7329, 250 Rue Albert Einstein, Sophia Antipolis, 06560 Valbonne, France; Department of Earth Sciences, Durham University, Durham DH1 3LE, United Kingdom

Recommended Citation:
Sauter D.,Cannat M.,Rouméjon S.,et al. Continuous exhumation of mantle-derived rocks at the Southwest Indian Ridge for 11 million years[J]. Nature Geoscience,2013-01-01,6(4)
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