globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2759
论文题名:
Extreme mantle uplift and exhumation along a transpressive transform fault
作者: Maia M.; Sichel S.; Briais A.; Brunelli D.; Ligi M.; Ferreira N.; Campos T.; Mougel B.; Brehme I.; Hémond C.; Motoki A.; Moura D.; Scalabrin C.; Pessanha I.; Alves E.; Ayres A.; Oliveira P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:8
起始页码: 619
结束页码: 623
语种: 英语
Scopus关键词: deformation mechanism ; exhumation ; extensional tectonics ; gravity field ; kinematics ; plate motion ; stress field ; thermochemistry ; transform fault ; transpression ; transtension ; uplift ; upper mantle ; Atlantic Ocean ; Mid-Atlantic Ridge ; Sierra Leone
英文摘要: Mantle exhumation at slow-spreading ridges is favoured by extensional tectonics through low-angle detachment faults, and, along transforms, by transtension due to changes in ridge/transform geometry. Less common, exhumation by compressive stresses has been proposed for the large-offset transforms of the equatorial Atlantic. Here we show, using high-resolution bathymetry, seismic and gravity data, that the northern transform fault of the St Paul system has been controlled by compressive deformation since ∼10 million years ago. The long-lived transpression resulted from ridge overlap due to the propagation of the northern Mid-Atlantic Ridge segment into the transform domain, which induced the migration and segmentation of the transform fault creating restraining stepovers. An anticlockwise change in plate motion at ∼11 million years ago initially favoured extension in the left-stepping transform, triggering the formation of a transverse ridge, later uplifted through transpression, forming the St Peter and St Paul islets. Enhanced melt supply at the ridge axis due to the nearby Sierra Leone thermo chemical anomaly is responsible for the robust response of the northern Mid-Atlantic Ridge segment to the kinematic change. The long-lived process at the origin of the compressive stresses is directly linked to the nature of the underlying mantle and not to a change in the far-field stress regime. © 2016 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/105946
Appears in Collections:气候减缓与适应
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作者单位: Laboratoire Domaines Océaniques, CNRS-Université de Bretagne Occidentale, IUEM, Rue Dumont d'Urville, Plouzané, France; LAGEMAR, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza S/N, Niteroi, Brazil; GET, Université de Toulouse, Avenue Edouard Belin, Toulouse, France; Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, Via Campi 103, Modena, Italy; ISMAR'CNR'Geologia Marina, Via Gobetti, 101, Bologna, Italy; Departamento de Geologia, Universidade Federal do Rio Grande do Norte, Cidade Universit'ria'Lagoa Nova, CP 1639, Natal, Brazil; Institut de Physique du Globe de Paris, 1, Rue Jussieu, Paris, France; Instituto de Geoci'ncias, Universidade do Estado do Rio de Janeiro, Centro de Tecnologia e Ciencias, Rua Sao Francisco, Rio de Janeiro, Brazil; Instituto de Astronomia, Geof'sica e Ci'ncias Atmosféricas, Universidade de Sao Paulo, Rua do Mat'o 1226, Sao Paulo, Brazil; Laboratoire d'Acoustique, IFREMER, Technopole Iroise, Plouzané, France; CPRM, Brazilian Geological Survey, Av. Pasteur, 404, Rio de Janeiro, Brazil

Recommended Citation:
Maia M.,Sichel S.,Briais A.,et al. Extreme mantle uplift and exhumation along a transpressive transform fault[J]. Nature Geoscience,2016-01-01,9(8)
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