Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL083490 |
The Bunce Fault and Strain Partitioning in the Northern Lesser Antilles | |
Laurencin, M.1,2,3; Marcaillou, B.4; Graindorge, D.1,2; Lebrun, J-F5; Klingelhoefer, F.6; Boucard, M.5; Laigle, M.4; Lallemand, S.7; Schenini, L.4 | |
2019-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:16页码:9573-9582 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Singapore |
英文摘要 | Strain partitioning related to oblique plate convergence has long been debated in Northern Lesser Antilles. Geophysical data acquired during the ANTITHESIS cruises highlight that the sinistral strike-slip Bunce Fault develops along the vertical, long, and linear discontinuity between the sedimentary wedge and a more rigid backstop. The narrowness of the 20- to 30-km-wide accretionary wedge and its continuity over -850 km is remarkable. The Bunce Fault extends as far south as 18.5 degrees N where it anastomoses within the accretionary prism where the sharp increase in convergence obliquity possibly acts as a mechanical threshold. Surface traces related to subducting seamounts suggest that 80% of the lateral component of the convergent motion is taken up by internal deformation within the accretionary prism and by the Bunce Fault. The absence of crustal-scale, long-term tectonic system south of the Anegada Passage casts doubt upon the degree of strain partitioning in the Northern Lesser Antilles. Plain Language Summary: Lithospheric plates are frequently bounded by subduction zones where oceanic plates underthrust overriding plates. In most cases, this convergence is oblique to the margin, its resulting tectonic deformation is generally due to margin-normal and margin-parallel components of the plate convergence vector. At the Northern Lesser Antilles, the North American Plate subducts beneath the Caribbean Plate with oblique convergence increasing from Guadeloupe to Virgin Islands. This study aims to analyze and resolve the tectonic deformation along this margin. We acquired marine geophysical data during ANTITHESIS cruises (2014-2016) to image the seafloor and the crustal structure. We place a particular emphasis on the strike-slip Bunce Fault, which extends over similar to 850 km, including a newly discovered 350-km segment, 20-30 km landward from the trench. Although long strike-slip faults have already been observed at oblique subduction zones, the proximity of the Bunce Fault to the trench is unprecedented. We conclude that the mechanical discontinuity between the sedimentary wedge and a more rigid backstop and the sharp increase in obliquity is likely to control the location of the trench-parallel, strike-slip deformation north of the Anegada Passage when strain partitioning to the south may be small or taken up in more diffuse pattern. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490966700031 |
WOS关键词 | CARIBBEAN PLATE ; VIRGIN-ISLANDS ; PUERTO-RICO ; ACCRETIONARY WEDGE ; OBLIQUE SUBDUCTION ; TECTONIC EVOLUTION ; ANEGADA PASSAGE ; SLIP VECTORS ; ARC ; CONVERGENCE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186241 |
专题 | 气候变化 |
作者单位 | 1.Univ Bretagne Pays Loire UBL, Lab Beosci Ocean, UMR6538 CNRs UBO UBS, Brest, France; 2.Inst Univ Europeen Mer, Plouzane, France; 3.Nanyang Technol Univ, Earth Observ Singapore, Singapore, Singapore; 4.Univ Cote dAzur, CNRS, Observ Cote dAzur, IRD,Geoazur, Valbonne, France; 5.Univ Montpellier, Geosci Montpellier, UMR5243, Univ Antilles,CNRS, Montpellier, France; 6.ZI Pointe Diable, IFREMER, Geosci Marines, Plouzane, France; 7.Univ Antilles, Univ Montpellier, CNRS, Geosci Montpellier, Montpellier, France |
推荐引用方式 GB/T 7714 | Laurencin, M.,Marcaillou, B.,Graindorge, D.,et al. The Bunce Fault and Strain Partitioning in the Northern Lesser Antilles[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(16):9573-9582. |
APA | Laurencin, M..,Marcaillou, B..,Graindorge, D..,Lebrun, J-F.,Klingelhoefer, F..,...&Schenini, L..(2019).The Bunce Fault and Strain Partitioning in the Northern Lesser Antilles.GEOPHYSICAL RESEARCH LETTERS,46(16),9573-9582. |
MLA | Laurencin, M.,et al."The Bunce Fault and Strain Partitioning in the Northern Lesser Antilles".GEOPHYSICAL RESEARCH LETTERS 46.16(2019):9573-9582. |
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