Refining the formation and early evolution of the Eastern North American Margin : new insights from multiscale magnetic anomaly analyses
Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 122 (2017): 8724–8748, doi:10.1002/2017JB014308....
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/9502 2023-05-15T17:32:02+02:00 Refining the formation and early evolution of the Eastern North American Margin : new insights from multiscale magnetic anomaly analyses Greene, John A. Tominaga, Masako Miller, Nathaniel C. Hutchinson, Deborah R. Karl, Matthew R. 2017-11-16 https://hdl.handle.net/1912/9502 en_US eng John Wiley & Sons https://doi.org/10.1002/2017JB014308 Journal of Geophysical Research: Solid Earth 122 (2017): 8724–8748 https://hdl.handle.net/1912/9502 doi:10.1002/2017JB014308 Journal of Geophysical Research: Solid Earth 122 (2017): 8724–8748 doi:10.1002/2017JB014308 ENAM Western North Atlantic Passive margin Magnetic anomalies Seafloor spreading Rifting Article 2017 ftwhoas https://doi.org/10.1002/2017JB014308 2022-05-28T23:00:06Z Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 122 (2017): 8724–8748, doi:10.1002/2017JB014308. To investigate the oceanic lithosphere formation and early seafloor spreading history of the North Atlantic Ocean, we examine multiscale magnetic anomaly data from the Jurassic/Early Cretaceous age Eastern North American Margin (ENAM) between 31 and 40°N. We integrate newly acquired sea surface magnetic anomaly and seismic reflection data with publicly available aeromagnetic and composite magnetic anomaly grids, satellite-derived gravity anomaly, and satellite-derived and shipboard bathymetry data. We evaluate these data sets to (1) refine magnetic anomaly correlations throughout the ENAM and assign updated ages and chron numbers to M0–M25 and eight pre-M25 anomalies; (2) identify five correlatable magnetic anomalies between the East Coast Magnetic Anomaly (ECMA) and Blake Spur Magnetic Anomaly (BSMA), which may document the earliest Atlantic seafloor spreading or synrift magmatism; (3) suggest preexisting margin structure and rifting segmentation may have influenced the seafloor spreading regimes in the Atlantic Jurassic Quiet Zone (JQZ); (4) suggest that, if the BSMA source is oceanic crust, the BSMA may be M series magnetic anomaly M42 (~168.5 Ma); (5) examine the along and across margin variation in seafloor spreading rates and spreading center orientations from the BSMA to M25, suggesting asymmetric crustal accretion accommodated the straightening of the ridge from the bend in the ECMA to the more linear M25; and (6) observe anomalously high-amplitude magnetic anomalies near the Hudson Fan, which may be related to a short-lived propagating rift segment that could have helped accommodate the crustal alignment during the early Atlantic opening. J. A. G. and M. T. thank the Department of Geology and Geophysics ... Article in Journal/Newspaper North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Hudson Journal of Geophysical Research: Solid Earth 122 11 8724 8748 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
ENAM Western North Atlantic Passive margin Magnetic anomalies Seafloor spreading Rifting |
spellingShingle |
ENAM Western North Atlantic Passive margin Magnetic anomalies Seafloor spreading Rifting Greene, John A. Tominaga, Masako Miller, Nathaniel C. Hutchinson, Deborah R. Karl, Matthew R. Refining the formation and early evolution of the Eastern North American Margin : new insights from multiscale magnetic anomaly analyses |
topic_facet |
ENAM Western North Atlantic Passive margin Magnetic anomalies Seafloor spreading Rifting |
description |
Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 122 (2017): 8724–8748, doi:10.1002/2017JB014308. To investigate the oceanic lithosphere formation and early seafloor spreading history of the North Atlantic Ocean, we examine multiscale magnetic anomaly data from the Jurassic/Early Cretaceous age Eastern North American Margin (ENAM) between 31 and 40°N. We integrate newly acquired sea surface magnetic anomaly and seismic reflection data with publicly available aeromagnetic and composite magnetic anomaly grids, satellite-derived gravity anomaly, and satellite-derived and shipboard bathymetry data. We evaluate these data sets to (1) refine magnetic anomaly correlations throughout the ENAM and assign updated ages and chron numbers to M0–M25 and eight pre-M25 anomalies; (2) identify five correlatable magnetic anomalies between the East Coast Magnetic Anomaly (ECMA) and Blake Spur Magnetic Anomaly (BSMA), which may document the earliest Atlantic seafloor spreading or synrift magmatism; (3) suggest preexisting margin structure and rifting segmentation may have influenced the seafloor spreading regimes in the Atlantic Jurassic Quiet Zone (JQZ); (4) suggest that, if the BSMA source is oceanic crust, the BSMA may be M series magnetic anomaly M42 (~168.5 Ma); (5) examine the along and across margin variation in seafloor spreading rates and spreading center orientations from the BSMA to M25, suggesting asymmetric crustal accretion accommodated the straightening of the ridge from the bend in the ECMA to the more linear M25; and (6) observe anomalously high-amplitude magnetic anomalies near the Hudson Fan, which may be related to a short-lived propagating rift segment that could have helped accommodate the crustal alignment during the early Atlantic opening. J. A. G. and M. T. thank the Department of Geology and Geophysics ... |
format |
Article in Journal/Newspaper |
author |
Greene, John A. Tominaga, Masako Miller, Nathaniel C. Hutchinson, Deborah R. Karl, Matthew R. |
author_facet |
Greene, John A. Tominaga, Masako Miller, Nathaniel C. Hutchinson, Deborah R. Karl, Matthew R. |
author_sort |
Greene, John A. |
title |
Refining the formation and early evolution of the Eastern North American Margin : new insights from multiscale magnetic anomaly analyses |
title_short |
Refining the formation and early evolution of the Eastern North American Margin : new insights from multiscale magnetic anomaly analyses |
title_full |
Refining the formation and early evolution of the Eastern North American Margin : new insights from multiscale magnetic anomaly analyses |
title_fullStr |
Refining the formation and early evolution of the Eastern North American Margin : new insights from multiscale magnetic anomaly analyses |
title_full_unstemmed |
Refining the formation and early evolution of the Eastern North American Margin : new insights from multiscale magnetic anomaly analyses |
title_sort |
refining the formation and early evolution of the eastern north american margin : new insights from multiscale magnetic anomaly analyses |
publisher |
John Wiley & Sons |
publishDate |
2017 |
url |
https://hdl.handle.net/1912/9502 |
geographic |
Hudson |
geographic_facet |
Hudson |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Geophysical Research: Solid Earth 122 (2017): 8724–8748 doi:10.1002/2017JB014308 |
op_relation |
https://doi.org/10.1002/2017JB014308 Journal of Geophysical Research: Solid Earth 122 (2017): 8724–8748 https://hdl.handle.net/1912/9502 doi:10.1002/2017JB014308 |
op_doi |
https://doi.org/10.1002/2017JB014308 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
122 |
container_issue |
11 |
container_start_page |
8724 |
op_container_end_page |
8748 |
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1766129951630688256 |