High-resolution reconstructions and GPS estimates of India–Eurasia and India–Somalia plate motions: 20 Ma to the present
SUMMARY We reconstruct the movement of the India Plate relative to Eurasia at ≈1-Myr intervals from 20 Ma to the present from GPS site velocities and high-resolution sequences of rotations from the India–Somalia–Antarctic–Nubia–North America–Eurasia Plate circuit. The plate circuit rotations, which...
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Oxford University Press (OUP)
2019
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Online Access: | http://dx.doi.org/10.1093/gji/ggz508 http://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggz508/30648260/ggz508.pdf http://academic.oup.com/gji/article-pdf/220/2/1149/31235911/ggz508.pdf |
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croxfordunivpr:10.1093/gji/ggz508 2024-06-23T07:47:51+00:00 High-resolution reconstructions and GPS estimates of India–Eurasia and India–Somalia plate motions: 20 Ma to the present DeMets, C Merkouriev, S Jade, S Russian Foundation for Basic Research National Science Foundation 2019 http://dx.doi.org/10.1093/gji/ggz508 http://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggz508/30648260/ggz508.pdf http://academic.oup.com/gji/article-pdf/220/2/1149/31235911/ggz508.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Geophysical Journal International volume 220, issue 2, page 1149-1171 ISSN 0956-540X 1365-246X journal-article 2019 croxfordunivpr https://doi.org/10.1093/gji/ggz508 2024-06-11T04:21:38Z SUMMARY We reconstruct the movement of the India Plate relative to Eurasia at ≈1-Myr intervals from 20 Ma to the present from GPS site velocities and high-resolution sequences of rotations from the India–Somalia–Antarctic–Nubia–North America–Eurasia Plate circuit. The plate circuit rotations, which are all estimated using the same data fitting functions, magnetic reversal sampling points, calibrations for magnetic reversal outward displacement, and noise mitigation methods, include new India–Somalia rotations estimated from numerous Carlsberg and northern Central Indian ridge plate kinematic data and high-resolution rotations from the Southwest Indian Ridge that account for slow motion between the Nubia and Somalia plates. Our new rotations indicate that India–Somalia plate motion slowed down by 25–30 per cent from 19.7 to 12.5–11.1 Ma, but remained steady since at least 9.8 Ma and possibly 12.5 Ma. Our new India–Eurasia rotations predict a relatively simple plate motion history, consisting of NNE-directed interplate convergence since 19 Ma, a ≈50 per cent convergence rate decrease from 19.7 to 12.5–11.1 Ma, and steady or nearly steady plate motion since 12.5–11.1 Ma. Instantaneous convergence rates estimated with our new India–Eurasia GPS angular velocity are 16 per cent slower than our reconstructed plate kinematic convergence rates for times since 2.6 Ma, implying either a rapid, recent slowdown in the convergence rate or larger than expected errors in our geodetic and/or plate kinematic estimates. During an acceleration of seafloor faulting within the wide India–Capricorn oceanic boundary at 8–7.5 Ma, our new rotations indicate that the motions of the India Plate relative to Somalia and Eurasia remained steady. We infer that forces acting on the Capricorn rather than the India Plate were responsible for the accelerated seafloor deformation, in accord with a previous study. India–Eurasia displacements that are predicted with our new, well-constrained rotations are fit poorly by a recently proposed model that ... Article in Journal/Newspaper Antarc* Antarctic Oxford University Press Antarctic Indian Geophysical Journal International 220 2 1149 1171 |
institution |
Open Polar |
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Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
description |
SUMMARY We reconstruct the movement of the India Plate relative to Eurasia at ≈1-Myr intervals from 20 Ma to the present from GPS site velocities and high-resolution sequences of rotations from the India–Somalia–Antarctic–Nubia–North America–Eurasia Plate circuit. The plate circuit rotations, which are all estimated using the same data fitting functions, magnetic reversal sampling points, calibrations for magnetic reversal outward displacement, and noise mitigation methods, include new India–Somalia rotations estimated from numerous Carlsberg and northern Central Indian ridge plate kinematic data and high-resolution rotations from the Southwest Indian Ridge that account for slow motion between the Nubia and Somalia plates. Our new rotations indicate that India–Somalia plate motion slowed down by 25–30 per cent from 19.7 to 12.5–11.1 Ma, but remained steady since at least 9.8 Ma and possibly 12.5 Ma. Our new India–Eurasia rotations predict a relatively simple plate motion history, consisting of NNE-directed interplate convergence since 19 Ma, a ≈50 per cent convergence rate decrease from 19.7 to 12.5–11.1 Ma, and steady or nearly steady plate motion since 12.5–11.1 Ma. Instantaneous convergence rates estimated with our new India–Eurasia GPS angular velocity are 16 per cent slower than our reconstructed plate kinematic convergence rates for times since 2.6 Ma, implying either a rapid, recent slowdown in the convergence rate or larger than expected errors in our geodetic and/or plate kinematic estimates. During an acceleration of seafloor faulting within the wide India–Capricorn oceanic boundary at 8–7.5 Ma, our new rotations indicate that the motions of the India Plate relative to Somalia and Eurasia remained steady. We infer that forces acting on the Capricorn rather than the India Plate were responsible for the accelerated seafloor deformation, in accord with a previous study. India–Eurasia displacements that are predicted with our new, well-constrained rotations are fit poorly by a recently proposed model that ... |
author2 |
Russian Foundation for Basic Research National Science Foundation |
format |
Article in Journal/Newspaper |
author |
DeMets, C Merkouriev, S Jade, S |
spellingShingle |
DeMets, C Merkouriev, S Jade, S High-resolution reconstructions and GPS estimates of India–Eurasia and India–Somalia plate motions: 20 Ma to the present |
author_facet |
DeMets, C Merkouriev, S Jade, S |
author_sort |
DeMets, C |
title |
High-resolution reconstructions and GPS estimates of India–Eurasia and India–Somalia plate motions: 20 Ma to the present |
title_short |
High-resolution reconstructions and GPS estimates of India–Eurasia and India–Somalia plate motions: 20 Ma to the present |
title_full |
High-resolution reconstructions and GPS estimates of India–Eurasia and India–Somalia plate motions: 20 Ma to the present |
title_fullStr |
High-resolution reconstructions and GPS estimates of India–Eurasia and India–Somalia plate motions: 20 Ma to the present |
title_full_unstemmed |
High-resolution reconstructions and GPS estimates of India–Eurasia and India–Somalia plate motions: 20 Ma to the present |
title_sort |
high-resolution reconstructions and gps estimates of india–eurasia and india–somalia plate motions: 20 ma to the present |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/gji/ggz508 http://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggz508/30648260/ggz508.pdf http://academic.oup.com/gji/article-pdf/220/2/1149/31235911/ggz508.pdf |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Geophysical Journal International volume 220, issue 2, page 1149-1171 ISSN 0956-540X 1365-246X |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/gji/ggz508 |
container_title |
Geophysical Journal International |
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220 |
container_issue |
2 |
container_start_page |
1149 |
op_container_end_page |
1171 |
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1802638056536145920 |