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A global data set of present-day oceanic crustal age and seafloor spreading parameters


Seton, M and Muller, RD and Zahirovic, S and Williams, S and Wright, NM and Cannon, J and Whittaker, JM and Matthews, KJ and McGirr, R, A global data set of present-day oceanic crustal age and seafloor spreading parameters, Geochemistry, Geophysics, Geosystems, 21, (10) Article e2020GC009214. ISSN 1525-2027 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 American Geophysical Union

DOI: doi:10.1029/2020GC009214


We present an updated oceanic crustal age grid and a set of complementary grids including spreading rate, asymmetry, direction, and obliquity. Our data set is based on a selected set of magnetic anomaly identifications and the plate tectonic model of Müller et al. (2019, 10.1029/2018TC005462). We find the mean age of oceanic crust is 64.2 Myr, slightly older than previous estimates, mainly due to the inclusion of pockets of Mesozoic aged crust in the Atlantic and Mediterranean and improvements to the Jurassic Pacific triangle. This older crust is partly compensated by additional Cenozoic‐aged back‐arc basin crust not included in previous models. The distribution of spreading modes based on area of preserved crust is relatively equal between slow (20–55 mm/yr) and fast (75–180 mm/yr) spreading systems at 33% and 39%, respectively. Crust transitional between fast and slow, or intermediate systems (55–75 mm/yr), cover 20% of the preserved ocean floor with much smaller proportions of crust formed at ultraslow (5%) and super‐fast (3%) spreading systems. Slow and intermediate spreading systems exhibit the most stable behavior in terms of spreading asymmetry and obliquity, with the widest distribution of obliquities occurring at ultraslow spreading systems, consistent with present‐day observations. Our confidence grid provides a complementary resource for nonexperts to identify those parts of the age grid that are least well constrained. Our grids in 6, 2, and 1 arc min resolution as well as our python workflow, isopolate, used to compute our data sets are freely available in online repositories and on the GPlates data portal.

Item Details

Item Type:Refereed Article
Keywords:seafloor, plate tectonics, spreading rate
Research Division:Earth Sciences
Research Group:Geology
Research Field:Marine geoscience
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Whittaker, JM (Associate Professor Jo Whittaker)
ID Code:142907
Year Published:2020
Web of Science® Times Cited:32
Deposited By:Oceans and Cryosphere
Deposited On:2021-02-16
Last Modified:2021-04-28

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