气候变化领域集成服务门户(CCPortal): Evidence of ridge propagation in the eastern Gulf of Mexico from integrated analysis of potential fields and seismic data

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DOI	10.1016/j.tecto.2019.228307
	Evidence of ridge propagation in the eastern Gulf of Mexico from integrated analysis of potential fields and seismic data
	Filina I.; Liu M.; Beutel E.
发表日期	2020
ISSN	00401951
卷号	775
英文摘要	Integrated analysis of gravity, magnetic, and seismic data reveals two phases of spreading in the eastern Gulf of Mexico (GOM) including two distinct spreading centers, suggesting a major ridge reorganization during the opening of the eastern part of the GOM. Ridge propagation between the two spreading episodes explains the following observations: 1) the drastic asymmetry in the oceanic domain of northeastern GOM, 2) the presence of two distinct crustal zones with dramatically different thickness and physical properties, and 3) the observed seismicity within the oceanic domain that is not aligned with any known tectonic structure. The initial Late Jurassic spreading center (~160 Ma) resulted in thin (~5 km) and uniform oceanic crust with a fast compressional velocity (7 km/s). Based on our analysis, the estimated full spreading rate of this older spreading event is less than 1 cm/yr. The spreading regime changed in Early Cretaceous around 150 Ma, resulting in a propagation (i.e., jump) of the spreading center. The new spreading episode was characterized by a change in spreading direction and increased magma supply as it produced thicker (up to 9 km) oceanic crust with a typical two-layered structure. Despite the increase in magmatic material, the full rate of this younger spreading event estimated from our analysis is only slightly faster (1.1 cm/yr assuming that spreading ceased at 137 Ma). The later conclusion is consistent with the morphology of the spreading centers mapped by seismic data. Our analysis shows that recent deep crustal earthquakes in the middle of the Gulf of Mexico are aligned with the boundary between the two identified distinct oceanic zones, referred here as a pseudofault. © 2019 Elsevier B.V.
英文关键词	Geophysical prospecting; Seismic response; Seismic waves; Compressional velocities; Crustal earthquakes; Different thickness; Integrated analysis; Magmatic materials; Ridge propagation; Tectonic structure; Two-layered structures; Data flow analysis; asymmetry; crustal structure; potential field; seismic data; seismic velocity; seismicity; spreading center; wave propagation; Atlantic Ocean; Gulf of Mexico
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207751
作者单位	Department of Earth and Atmospheric Sciences, the University of Nebraska, Lincoln, United States; Department of Earth and Atmospheric Sciences, the University of Houston, United States; Department of Geology and Environmental Geoscience, the College of Charleston, United States
推荐引用方式 GB/T 7714	Filina I.,Liu M.,Beutel E.. Evidence of ridge propagation in the eastern Gulf of Mexico from integrated analysis of potential fields and seismic data[J],2020,775.
APA	Filina I.,Liu M.,&Beutel E..(2020).Evidence of ridge propagation in the eastern Gulf of Mexico from integrated analysis of potential fields and seismic data.Tectonophysics,775.
MLA	Filina I.,et al."Evidence of ridge propagation in the eastern Gulf of Mexico from integrated analysis of potential fields and seismic data".Tectonophysics 775(2020).