气候变化领域集成服务门户(CCPortal): The Role of Premagmatic Rifting in Shaping a Volcanic Continental Margin: An Example From the Eastern North American Margin

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DOI	10.1029/2020JB019576
	The Role of Premagmatic Rifting in Shaping a Volcanic Continental Margin: An Example From the Eastern North American Margin
	Lang G.; ten Brink U.S.; Hutchinson D.R.; Mountain G.S.; Schattner U.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	Both magmatic and tectonic processes contribute to the formation of volcanic continental margins. Such margins are thought to undergo extension across a narrow zone of lithospheric thinning (~100 km). New observations based on existing and reprocessed data from the Eastern North American Margin contradict this hypothesis. With ~64,000 km of 2-D seismic data tied to 40 wells combined with published refraction, deep reflection, receiver function, and onshore drilling efforts, we quantified along-strike variations in the distribution of rift structures, magmatism, crustal thickness, and early post-rift sedimentation under the shelf of Baltimore Canyon Trough (BCT), Long Island Platform, and Georges Bank Basin (GBB). Results indicate that BCT is narrow (80–120 km) with a sharp basement hinge and few rift basins. The seaward dipping reflectors (SDR) there extend ~50 km seaward of the hinge line. In contrast, the GBB is wide (~200 km), has many syn-rift structures, and the SDR there extend ~200 km seaward of the hinge line. Early post-rift depocenters at the GBB coincide with thinner crust suggesting “uniform” thinning of the entire lithosphere. Models for the formation of volcanic margins do not explain the wide structure of the GBB. We argue that crustal thinning of the BCT was closely associated with late syn-rift magmatism, whereas the broad thinning of the GBB segment predated magmatism. Correlation of these variations to crustal terranes of different compositions suggests that the inherited rheology determined the premagmatic response of the lithosphere to extension. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Central Atlantic; continental breakup; Eastern North American Margin; inherited rheology; lithosphere thinning; volcanic continental 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/187503
作者单位	Dr. Moses Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa, Haifa, Israel; Woods Hole Science Center, U.S. Geological Survey, Woods Hole, MA, United States; Department of Earth and Planetary Sciences, Rutgers, State University of New Jersey, Piscataway, NJ, United States
推荐引用方式 GB/T 7714	Lang G.,ten Brink U.S.,Hutchinson D.R.,et al. The Role of Premagmatic Rifting in Shaping a Volcanic Continental Margin: An Example From the Eastern North American Margin[J],2020,125(11).
APA	Lang G.,ten Brink U.S.,Hutchinson D.R.,Mountain G.S.,&Schattner U..(2020).The Role of Premagmatic Rifting in Shaping a Volcanic Continental Margin: An Example From the Eastern North American Margin.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Lang G.,et al."The Role of Premagmatic Rifting in Shaping a Volcanic Continental Margin: An Example From the Eastern North American Margin".Journal of Geophysical Research: Solid Earth 125.11(2020).