Geophysics of the Pitman Fracture Zone and Pacific-Antarctic Plate Motions During the Cenozoic

Cande, S. C.; Raymond, C. A.; Stock, J. M.; Haxby, W. F.

doi:10.1126/science.270.5238.947

Cited by 225 publications

(210 citation statements)

References 40 publications

Supporting

Mentioning

200

Contrasting

Order By: Relevance

“…However, if MBL-East Antarctic motion is also responsible for the discrepancy between the predicted and actual Hawaiian-Emperor hotspot track then it is possible to define a common Euler pole that will account for both the MBL-East Antarctic relative motion and the Pacific vs. Indo-Atlantic hotspot discrepancy. We choose to solve for the post-64.7 Ma offset of Suiko Seamount vs. the predicted 64.7 Ma hotspot position because Suiko Seamount is the oldest dated edifice in the Hawaiian-Emperor chain for which there is a seafloor spreading model [8] constrained by fracture zone trends and magnetic anomalies on both sides of the ridge to link the Pacific with Antarctica. The best-fit Euler pole is determined from the intersection of the perpendicular bisector to the ¾100 Ma paleomagnetic poles for East Antarctica and MBL [15] and the perpendicular bisector to the position of Suiko Seamount with respect to MBL at 64.7 Ma and the predicted hotspot position at 64.7 Ma (Fig.…”

Section: Implications Of Paleomagnetic Results From Marie Byrd Landmentioning

confidence: 99%

“…Studies comparing Indo-Atlantic hotspot tracks with the Hawaiian-Emperor hotspot track on the Pacific plate have found significant discrepancies between the predicted vs. actual hotspot track [7][8][9][10] (Fig. 1).…”

Section: Testing Hotspot Fixitymentioning

confidence: 99%

“…DiVenere et al [15] also argued against large errors in published Cretaceous seafloor spreading data because paleomagnetic poles transferred to Antarctica from North America, Africa, India, and Australia were evenly distributed forming a generally smooth synthetic apparent polar wander (APW) path. Cande et al [8] presented newly acquired seafloor spreading data linking Antarctica with the Pacific plate. These new data did not remove the hotspot discrepancy.…”

Section: Seafloor Spreading Parametersmentioning

confidence: 99%

“…Paleomagnetic poles have also been derived from the skewness of marine magnetic anomalies on the Pacific plate [20,[24][25][26][27]. [18] global, non-Pacific, synthetic APW path transferred to Antarctica [15] and to the Pacific using Cande et al [8]; NZ 75, [19] ca. 75 Ma result from Chatham Islands, south Pacific; Pac 32 through Pac 76v are Pacific anomaly skewness poles; Pac 32, [20]; Pac 57, [26]; Pac 65, [24]; Pac 73, [25]; Pac 76v, [27]; Pac 76s, [23] Pacific seamount-based pole; Pac 81, co-latitude circle from Detroit Seamount [47].…”

Section: Coherence Of the Pacific Platementioning

confidence: 99%

“…However, tests of hotspot fixity have shown a significant discrepancy between the Hawaiian-Emperor and Indo-Atlantic hotspots (e.g. [7,8]), although the discrepancy has often been ascribed to unquantified plate motions especially within the Antarctic plate [9] or perhaps Pacific plate [10]. In this paper we examine the relative fixity of Indo-Atlantic versus Pacific hotspots by testing the global plate circuit through Antarctica.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

DiVenere

Kent

1999

Earth and Planetary Science Letters

View full text Add to dashboard Cite

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.

show abstract

Section: Implications Of Paleomagnetic Results From Marie Byrd Landmentioning

confidence: 99%

Section: Testing Hotspot Fixitymentioning

confidence: 99%

Section: Seafloor Spreading Parametersmentioning

confidence: 99%

Section: Coherence Of the Pacific Platementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

DiVenere

Kent

1999

Earth and Planetary Science Letters

View full text Add to dashboard Cite

show abstract

Community infrastructure and repository for marine magnetic identifications

Seton

Whittaker

Wessel

et al. 2014

Geochem. Geophys. Geosyst.

Self Cite

119

View full text Add to dashboard Cite

Magnetic anomaly identifications underpin plate tectonic reconstructions and form the primary data set from which the age of the oceanic lithosphere and seafloor spreading regimes in the ocean basins can be determined. Although these identifications are an invaluable resource, their usefulness to the wider scientific community has been limited due to the lack of a central community infrastructure to organize, host, and update these interpretations. We have developed an open-source, community-driven online infrastructure as a repository for quality-checked magnetic anomaly identifications from all ocean basins. We provide a global sample data set that comprises 96,733 individually picked magnetic anomaly identifications organized by ocean basin and publication reference, and provide accompanying Hellingerformat files, where available. Our infrastructure is designed to facilitate research in plate tectonic reconstructions or research that relies on an assessment of plate reconstructions, for both experts and nonexperts alike. To further enhance the existing repository and strengthen its value, we encourage others in the community to contribute to this effort.

show abstract

Tests of fixity of the Indo‐Atlantic hot spots relative to Pacific hot spots

2014

View full text Add to dashboard Cite

Rates of inter-hot spot motion have been debated for decades. Herein we present updated predictions for the tracks of the Tristan da Cunha, Réunion, and Iceland hot spots assuming them to be fixed relative to Pacific hot spots. Uncertainties in Pacific hot spot rotations, which include uncertainties in the current locations of hot spots of 100-200 km, are combined with uncertainties in relative plate motions accumulated through the plate circuit to obtain the final uncertainty in the predicted positions (including uncertainties of 150-200 km in the current locations of the Indo-Atlantic hot spots). Improvements to reconstruction methods, to relative plate reconstructions, to age dates along the tracks, and to the geomagnetic reversal timescale lead to significant changes from prior results. When compared with the observed tracks, the predicted tracks indicate nominal rates of motion of only 2-6 mm a À1 of these Indo-Atlantic hot spots relative to Pacific hot spots over the past 48 Ma. Within the uncertainties, the rates range from no motion to rates as high as 8-13 mm a À1. For reconstructions prior to 48 Ma B.P., however, the apparent rates of inter-hot spot motion are much larger, 46-55 ± 20 mm a À1, if the motion occurred entirely between 68 Ma B.P. and 48 Ma B.P. Either hot spots moved rapidly before 48 Ma B.P., and slowed drastically at ≈ 48 Ma B.P., or global plate circuits through Antarctica become less reliable as one goes increasingly further into the past. Most paleomagnetic data favor the latter explanation.

show abstract

Geophysics of the Pitman Fracture Zone and Pacific-Antarctic Plate Motions During the Cenozoic

Cited by 225 publications

References 40 publications

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

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

Community infrastructure and repository for marine magnetic identifications

Tests of fixity of the Indo‐Atlantic hot spots relative to Pacific hot spots

Contact Info

Product

Resources

About