气候变化领域集成服务门户(CCPortal): Along-Margin Variations in Breakup Volcanism at the Eastern North American Margin

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DOI	10.1029/2020JB020040
	Along-Margin Variations in Breakup Volcanism at the Eastern North American Margin
	Greene J.A.; Tominaga M.; Miller N.C.
发表日期	2020
ISSN	21699313
卷号	125 期号:12
英文摘要	We model the magnetic signature of rift-related volcanism to understand the distribution and volume of magmatic activity that occurred during the breakup of Pangaea and early Atlantic opening at the Eastern North American Margin (ENAM). Along-strike variations in the amplitude and character of the prominent East Coast Magnetic Anomaly (ECMA) suggest that the emplacement of the volcanic layers producing this anomaly similarly varied along the margin. We use three-dimensional magnetic forward modeling constrained by seismic interpretations to identify along-margin variations in volcanic thickness and width that can explain the observed amplitude and character of the ECMA. Our model results suggest that the ECMA is produced by a combination of both first-order (~600–1,000 km) and second-order (~50–100 km) magmatic segmentation. The first-order magmatic segmentation could have resulted from preexisting variations in crustal thickness and rheology developed during the tectonic amalgamation of Pangaea. The second-order magmatic segmentation developed during continental breakup and likely influenced the segmentation and transform fault spacing of the initial, and modern, Mid-Atlantic Ridge. These variations in magmatism show how extension and thermal weakening was distributed at the ENAM during continental breakup and how this breakup magmatism was related to both previous and subsequent Wilson cycle stages. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atlantic Ocean; breakup magmatism; continental breakup; ENAM; magnetic modeling; rifted margin
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/187471
作者单位	Department of Geology and Geophysics, Texas A&M University, College Station, TX, United States; Now at Geology Department, Chevron Technical Center, Houston, TX, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Woods Hole Coastal and Marine Science Center, United States Geological Survey, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Greene J.A.,Tominaga M.,Miller N.C.. Along-Margin Variations in Breakup Volcanism at the Eastern North American Margin[J],2020,125(12).
APA	Greene J.A.,Tominaga M.,&Miller N.C..(2020).Along-Margin Variations in Breakup Volcanism at the Eastern North American Margin.Journal of Geophysical Research: Solid Earth,125(12).
MLA	Greene J.A.,et al."Along-Margin Variations in Breakup Volcanism at the Eastern North American Margin".Journal of Geophysical Research: Solid Earth 125.12(2020).