气候变化领域集成服务门户(CCPortal): Seismic Crustal Structure and Morphotectonic Features Associated With the Chain Fracture Zone and Their Role in the Evolution of the Equatorial Atlantic Region

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DOI	10.1029/2020JB020275
	Seismic Crustal Structure and Morphotectonic Features Associated With the Chain Fracture Zone and Their Role in the Evolution of the Equatorial Atlantic Region
	Marjanović M.; Singh S.C.; Gregory E.P.M.; Grevemeyer I.; Growe K.; Wang Z.; Vaddineni V.; Laurencin M.; Carton H.; Gómez de la Peña L.; Filbrandt C.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	Oceanic transform faults and fracture zones (FZs) represent major bathymetric features that keep the records of past and present strike-slip motion along conservative plate boundaries. Although they play an important role in ridge segmentation and evolution of the lithosphere, their structural characteristics, and their variation in space and time, are poorly understood. To address some of the unknowns, we conducted interdisciplinary geophysical studies in the equatorial Atlantic Ocean, the region where some of the most prominent transform discontinuities have been developing. Here we present the results of the data analysis in the vicinity of the Chain FZ, on the South American Plate. The crustal structure across the Chain FZ, at the contact between ∼10 and 24 Ma oceanic lithosphere, is sampled along seismic reflection and refraction profiles. We observe that the crustal thickness within and across the Chain FZ ranges from ∼4.6–5.9 km, which compares with the observations reported for slow-slipping transform discontinuities globally. We attribute this presence of close to normal oceanic crustal thickness within FZs to the mechanism of lateral dike propagation, previously considered to be valid only in fast-slipping environments. Furthermore, the combination of our results with other data sets enabled us to extend the observations to morphotectonic characteristics on a regional scale. Our broader view suggests that the formation of the transverse ridge is closely associated with a global plate reorientation that was also responsible for the propagation and for shaping lower-order Mid-Atlantic Ridge segmentation around the equator. ©2020. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187578
作者单位	Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France; GEOMAR Helmholtz Centre of Ocean Research Kiel, RD4—Marine Geodynamics, Kiel, Germany; Applied Geophysics Program, TU Delft, ETH Zürich, RWTH Aachen, Aachen, Germany
推荐引用方式 GB/T 7714	Marjanović M.,Singh S.C.,Gregory E.P.M.,et al. Seismic Crustal Structure and Morphotectonic Features Associated With the Chain Fracture Zone and Their Role in the Evolution of the Equatorial Atlantic Region[J],2020,125(10).
APA	Marjanović M..,Singh S.C..,Gregory E.P.M..,Grevemeyer I..,Growe K..,...&Filbrandt C..(2020).Seismic Crustal Structure and Morphotectonic Features Associated With the Chain Fracture Zone and Their Role in the Evolution of the Equatorial Atlantic Region.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Marjanović M.,et al."Seismic Crustal Structure and Morphotectonic Features Associated With the Chain Fracture Zone and Their Role in the Evolution of the Equatorial Atlantic Region".Journal of Geophysical Research: Solid Earth 125.10(2020).