Large-scale motion between Pacific and Atlantic hotspots

Tarduno, J. A.; Gee, J. S.

doi:10.1038/378477a0

Cited by 115 publications

(59 citation statements)

References 26 publications

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“…com It is interesting to note that the breakup age between Greater India and Australia roughly corresponds to the time when subduction stopped east of Australia at around 130 Ma, probably due to subduction of the Phoenix-Pacific spreading ridge [Bradshaw, 1991] However, these observations are at odds with Duncan and Clague's [1985] model for westward Pacific absolute plate motion from 150 to 100 Ma, as it would require convergence between the Australian and Pacific plates from 130 to 100 Ma, if all hotspot have been fixed relative to each other. This discrepancy highlights the possibility of large-scale differential mantle motion as suggested by Tarduno and Gee [1995] and DiVenere and Kent [1999], rather than true polar wander, to account for Van Fossen and Kent's [1992] observations and for the lack of evidence for Australian-Pacific convergence from 130-100 Ma.…”

Section: Relative and Absolute Plate Motionsmentioning

confidence: 65%

Mesozoic/Cenozoic tectonic events around Australia

Müller

Gaina

Tikku

et al. 2000

Geophysical Monograph Series

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Section: Relative and Absolute Plate Motionsmentioning

confidence: 65%

Mesozoic/Cenozoic tectonic events around Australia

Müller

Gaina

Tikku

et al. 2000

Geophysical Monograph Series

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“…These models assume that hotspots are fixed or move only very slowly relative to each other. However, the motion between hotspots remains poorly known and the assumption of hotspot fixity is controversial (Molnar and Stock, 1987;Acton and Gordon, 1994;Tarduno and Gee, 1995). It is known that recon- structions based on the Indo-Atlantic and Pacific hotspots do not agree with each other.…”

Section: Methods and The Datamentioning

confidence: 99%

Mapping absolute migration of global mid-ocean ridges since 80 Ma to Present

Masalu

2007

Earth Planet Sp

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We have computed and mapped the absolute migration of global mid-ocean ridges in the past 80 m.y. and found that ridges have migrated substantially during that period. Presently, the faster-migrating ridges are Pacific-Antarctic, Central Indian, Southeast Indian, Juan de Fuca, Pacific-Nazca, Antarctic-Nazca and AustraliaAntarctic ridges which migrate between 3.3 and 5.5 cm/yr. The slower-migrating ridges are Mid-Atlantic and Southwest Indian ridges which migrate between 0.3 and 2.0 cm/yr. Comparing these results with mantle tomography and geochemistry suggests that slower-migrating ridges have deeper depth of origin than faster-migrating ridges, implying a correlation between migration velocity and depth of origin of ridges. The reconstructed Southwestern Indian ridge (near 44• E) between 60 Ma and Present, lies atop reconstructed Central Indian ridge between 80 and 50 Ma, and the present-day Antarctic-Nazca or (Chile) ridge lies atop the reconstructed East Pacific Rise at 70 Ma. Furthermore, the South Mid Atlantic Ridge and the East Pacific Rise near 10• S appear to have been stationary relative to the mantle for the last 80 m.y. These observations suggest that different portions of the mantle have undergone different recycling history, and may explain the origin of mantle heterogeneities.

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“…This is counter to the true polar wander explanation for changing hotspot latitudes but is evidence for relative hotspot motions. Tarduno and Gee [46] compared the paleolatitudes of some Cretaceous age Pacific guyots with the present latitude of active hotspots that they assumed had formed the guyots. From their comparison with Atlantic hotspots they also concluded that there must have been large-scale motions between Pacific and Atlantic hotspots.…”

Section: Discussionmentioning

confidence: 99%

Are the Pacific and Indo–Atlantic hotspots fixed? Testing the plate circuit through Antarctica

DiVenere

Kent

1999

Earth and Planetary Science Letters

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It is often assumed that hotspots are fixed relative to one another and thus constitute a global reference frame for measuring absolute plate motions and true polar wander. But it has long been known that the best documented hotspot track, the Hawaiian-Emperor chain, is inconsistent with the internally coherent tracks left by the Indo-Atlantic hotspots. This inconsistency is due either to unquantified motions within the plate circuit linking the Pacific with other plates, for example, between East and West Antarctica, or relative motion between the Hawaiian-Emperor and Indo-Atlantic hotspots. Analysis of recent paleomagnetic results from Marie Byrd Land in West Antarctica confirms that there has been post-100 Ma motion between West Antarctica (Marie Byrd Land) and East Antarctica. However, incorporation of this motion into the plate circuit does not account for the Cenozoic hotspot discrepancy. Comparison of an updated inventory of Pacific and non-Pacific paleomagnetic data does not show a significant systematic discrepancy, which, along with other observations, indicates that missing plate boundaries and other errors in the plate circuit play a relatively small role in the hotspot inconsistency. We conclude that most of the apparent motion between the Hawaiian-Emperor and Indo-Atlantic hotspots is real. The best-estimate average drift rate between these sets of hotspots is approximately 25 mm=yr since 65 Ma, ignoring errors in the plate circuit and a small contribution from Cenozoic motions between East and West Antarctica.

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Large-scale motion between Pacific and Atlantic hotspots

Cited by 115 publications

References 26 publications

Mesozoic/Cenozoic tectonic events around Australia

Mesozoic/Cenozoic tectonic events around Australia

Mapping absolute migration of global mid-ocean ridges since 80 Ma to Present

Are the Pacific and Indo–Atlantic hotspots fixed? Testing the plate circuit through Antarctica

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