A paleomagnetic and U-Pb geochronology study of the western end of the Grenville dyke swarm: Rapid changes in paleomagnetic field direction at ca. 585 Ma related to polarity reversals?
(2015) In Precambrian Research 257. p.137-166- Abstract
- A paleomagnetic study of the western end of the similar to 585 Ma Grenville dyke swarm shows that individual dykes are characterized by high coercivity and unblocking temperature magnetizations that can differ in direction by as much as 90 degrees. Field tests including baked contact studies and the continuity of paleomagnetic direction along dyke strike, suggest that the magnetizations are primary. Precise U-Pb baddeleyite dating on these dykes indicates that changes in magnetization direction of similar to 90 degrees occur in less than 4 million years, and their close temporal association with reversals of the axial dipole field suggest that certain dykes are recording an equatorial dipole field as a transitional field between opposite... (More)
- A paleomagnetic study of the western end of the similar to 585 Ma Grenville dyke swarm shows that individual dykes are characterized by high coercivity and unblocking temperature magnetizations that can differ in direction by as much as 90 degrees. Field tests including baked contact studies and the continuity of paleomagnetic direction along dyke strike, suggest that the magnetizations are primary. Precise U-Pb baddeleyite dating on these dykes indicates that changes in magnetization direction of similar to 90 degrees occur in less than 4 million years, and their close temporal association with reversals of the axial dipole field suggest that certain dykes are recording an equatorial dipole field as a transitional field between opposite polarity states. The documented instability in the Earth's field occurs less than 10 Myr before the first recorded appearance of macroscopic multi-cellular organisms on Earth, inviting speculation that an extended period of frequent magnetic reversals may play a part in faunal evolution. (C) 2014 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5176029
- author
- Halls, Henry C. ; Lovette, Alan ; Hamilton, Mike and Söderlund, Ulf LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Neoproterozoic, Grenville dyke swarm, Paleomagnetism, U-Pb baddeleyite, geochronology, Magnetochronology, Faunal evolution
- in
- Precambrian Research
- volume
- 257
- pages
- 137 - 166
- publisher
- Elsevier
- external identifiers
-
- wos:000349586300010
- scopus:84919897406
- ISSN
- 0301-9268
- DOI
- 10.1016/j.precamres.2014.11.029
- language
- English
- LU publication?
- yes
- id
- 984f2150-9a0c-4487-b46e-67613f654e2e (old id 5176029)
- date added to LUP
- 2016-04-01 10:06:48
- date last changed
- 2022-03-04 08:12:21
@article{984f2150-9a0c-4487-b46e-67613f654e2e,
abstract = {{A paleomagnetic study of the western end of the similar to 585 Ma Grenville dyke swarm shows that individual dykes are characterized by high coercivity and unblocking temperature magnetizations that can differ in direction by as much as 90 degrees. Field tests including baked contact studies and the continuity of paleomagnetic direction along dyke strike, suggest that the magnetizations are primary. Precise U-Pb baddeleyite dating on these dykes indicates that changes in magnetization direction of similar to 90 degrees occur in less than 4 million years, and their close temporal association with reversals of the axial dipole field suggest that certain dykes are recording an equatorial dipole field as a transitional field between opposite polarity states. The documented instability in the Earth's field occurs less than 10 Myr before the first recorded appearance of macroscopic multi-cellular organisms on Earth, inviting speculation that an extended period of frequent magnetic reversals may play a part in faunal evolution. (C) 2014 Elsevier B.V. All rights reserved.}},
author = {{Halls, Henry C. and Lovette, Alan and Hamilton, Mike and Söderlund, Ulf}},
issn = {{0301-9268}},
keywords = {{Neoproterozoic; Grenville dyke swarm; Paleomagnetism; U-Pb baddeleyite; geochronology; Magnetochronology; Faunal evolution}},
language = {{eng}},
pages = {{137--166}},
publisher = {{Elsevier}},
series = {{Precambrian Research}},
title = {{A paleomagnetic and U-Pb geochronology study of the western end of the Grenville dyke swarm: Rapid changes in paleomagnetic field direction at ca. 585 Ma related to polarity reversals?}},
url = {{http://dx.doi.org/10.1016/j.precamres.2014.11.029}},
doi = {{10.1016/j.precamres.2014.11.029}},
volume = {{257}},
year = {{2015}},
}