The anticorrelated velocities of Africa and India in the Late Cretaceous and early Cenozoic
International audience We present a revised interpretation of magnetic anomalies and fracture zones on the Southwest Indian Ridge (SWIR; Africa-Antarctica) and the Southeast Indian Ridge (SEIR; Capricorn-Antarctica) and use them to calculate 2-plate finite rotations for anomalies 34 to 20 (84 to 43...
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ftunivparis:oai:HAL:insu-03580035v1 2023-06-11T04:06:44+02:00 The anticorrelated velocities of Africa and India in the Late Cretaceous and early Cenozoic Cande, Steven C. Patriat, Philippe Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2015 https://hal-insu.archives-ouvertes.fr/insu-03580035 https://hal-insu.archives-ouvertes.fr/insu-03580035/document https://hal-insu.archives-ouvertes.fr/insu-03580035/file/ggu392.pdf https://doi.org/10.1093/gji/ggu392 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu392 insu-03580035 https://hal-insu.archives-ouvertes.fr/insu-03580035 https://hal-insu.archives-ouvertes.fr/insu-03580035/document https://hal-insu.archives-ouvertes.fr/insu-03580035/file/ggu392.pdf BIBCODE: 2015GeoJI.200.227C doi:10.1093/gji/ggu392 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal-insu.archives-ouvertes.fr/insu-03580035 Geophysical Journal International, 2015, 200, pp.227-243. ⟨10.1093/gji/ggu392⟩ Plate motions Kinematics of crustal and mantle deformation Indian Ocean [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2015 ftunivparis https://doi.org/10.1093/gji/ggu392 2023-04-26T16:21:56Z International audience We present a revised interpretation of magnetic anomalies and fracture zones on the Southwest Indian Ridge (SWIR; Africa-Antarctica) and the Southeast Indian Ridge (SEIR; Capricorn-Antarctica) and use them to calculate 2-plate finite rotations for anomalies 34 to 20 (84 to 43 Ma). Central Indian Ridge (CIR; Capricorn-Africa) rotations are calculated by summing the SWIR and SEIR rotations. These rotations provide a high-resolution record of changes in the motion of India and Africa at the time of the onset of the Reunion plume head. An analysis of the relative velocities of India, Africa and Antarctica leads to a refinement of previous observations that the speedup of India relative to the mantle was accompanied by a slowdown of Africa. The most rapid slowdown of Africa occurs around Chron 32Ay (71 Ma), the time when India's motion relative to Africa notably starts to accelerate. Using the most recent Geomagnetic Polarity Timescale (GTS12) we show that India's velocity relative to Africa was characterized by an acceleration from roughly 60 to 180 mm yr -1 between 71 and 66 Ma, a short pulse of superfast motion (∼180 mm yr -1 ) between 66 and 63 Ma, an abrupt slowdown to 120 mm yr -1 between 63 and 62 Ma, and then a long period (63 to 47 Ma) of gradual slowing, but still fast motion (∼100 mm yr -1 ), which ends with a rapid slowdown after Chron 21o (47 Ma). Changes in the velocities of Africa and India with respect to the mantle follow a similar pattern. The fastest motion of India relative to the mantle, ∼220 mm yr -1 , occurs during Chron 29R. The SWIR rotations constrain three significant changes in the migration path of the Africa-Antarctic stage poles: following Chron 33y (73 Ma), following Chron 31y (68 Ma), and following Chron 24o (54 Ma). The change in the migration path of the SWIR stage poles following Chron 33y is coincident with the most rapid slowdown in Africa's motion. The change in the migration path after Chron 31y, although coincident with the most rapid acceleration of ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Université de Paris: Portail HAL Antarctic Indian Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Geophysical Journal International 200 1 227 243 |
institution |
Open Polar |
collection |
Université de Paris: Portail HAL |
op_collection_id |
ftunivparis |
language |
English |
topic |
Plate motions Kinematics of crustal and mantle deformation Indian Ocean [SDU]Sciences of the Universe [physics] |
spellingShingle |
Plate motions Kinematics of crustal and mantle deformation Indian Ocean [SDU]Sciences of the Universe [physics] Cande, Steven C. Patriat, Philippe The anticorrelated velocities of Africa and India in the Late Cretaceous and early Cenozoic |
topic_facet |
Plate motions Kinematics of crustal and mantle deformation Indian Ocean [SDU]Sciences of the Universe [physics] |
description |
International audience We present a revised interpretation of magnetic anomalies and fracture zones on the Southwest Indian Ridge (SWIR; Africa-Antarctica) and the Southeast Indian Ridge (SEIR; Capricorn-Antarctica) and use them to calculate 2-plate finite rotations for anomalies 34 to 20 (84 to 43 Ma). Central Indian Ridge (CIR; Capricorn-Africa) rotations are calculated by summing the SWIR and SEIR rotations. These rotations provide a high-resolution record of changes in the motion of India and Africa at the time of the onset of the Reunion plume head. An analysis of the relative velocities of India, Africa and Antarctica leads to a refinement of previous observations that the speedup of India relative to the mantle was accompanied by a slowdown of Africa. The most rapid slowdown of Africa occurs around Chron 32Ay (71 Ma), the time when India's motion relative to Africa notably starts to accelerate. Using the most recent Geomagnetic Polarity Timescale (GTS12) we show that India's velocity relative to Africa was characterized by an acceleration from roughly 60 to 180 mm yr -1 between 71 and 66 Ma, a short pulse of superfast motion (∼180 mm yr -1 ) between 66 and 63 Ma, an abrupt slowdown to 120 mm yr -1 between 63 and 62 Ma, and then a long period (63 to 47 Ma) of gradual slowing, but still fast motion (∼100 mm yr -1 ), which ends with a rapid slowdown after Chron 21o (47 Ma). Changes in the velocities of Africa and India with respect to the mantle follow a similar pattern. The fastest motion of India relative to the mantle, ∼220 mm yr -1 , occurs during Chron 29R. The SWIR rotations constrain three significant changes in the migration path of the Africa-Antarctic stage poles: following Chron 33y (73 Ma), following Chron 31y (68 Ma), and following Chron 24o (54 Ma). The change in the migration path of the SWIR stage poles following Chron 33y is coincident with the most rapid slowdown in Africa's motion. The change in the migration path after Chron 31y, although coincident with the most rapid acceleration of ... |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Cande, Steven C. Patriat, Philippe |
author_facet |
Cande, Steven C. Patriat, Philippe |
author_sort |
Cande, Steven C. |
title |
The anticorrelated velocities of Africa and India in the Late Cretaceous and early Cenozoic |
title_short |
The anticorrelated velocities of Africa and India in the Late Cretaceous and early Cenozoic |
title_full |
The anticorrelated velocities of Africa and India in the Late Cretaceous and early Cenozoic |
title_fullStr |
The anticorrelated velocities of Africa and India in the Late Cretaceous and early Cenozoic |
title_full_unstemmed |
The anticorrelated velocities of Africa and India in the Late Cretaceous and early Cenozoic |
title_sort |
anticorrelated velocities of africa and india in the late cretaceous and early cenozoic |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03580035 https://hal-insu.archives-ouvertes.fr/insu-03580035/document https://hal-insu.archives-ouvertes.fr/insu-03580035/file/ggu392.pdf https://doi.org/10.1093/gji/ggu392 |
long_lat |
ENVELOPE(110.000,110.000,-50.000,-50.000) |
geographic |
Antarctic Indian Southeast Indian Ridge |
geographic_facet |
Antarctic Indian Southeast Indian Ridge |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal-insu.archives-ouvertes.fr/insu-03580035 Geophysical Journal International, 2015, 200, pp.227-243. ⟨10.1093/gji/ggu392⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu392 insu-03580035 https://hal-insu.archives-ouvertes.fr/insu-03580035 https://hal-insu.archives-ouvertes.fr/insu-03580035/document https://hal-insu.archives-ouvertes.fr/insu-03580035/file/ggu392.pdf BIBCODE: 2015GeoJI.200.227C doi:10.1093/gji/ggu392 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggu392 |
container_title |
Geophysical Journal International |
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200 |
container_issue |
1 |
container_start_page |
227 |
op_container_end_page |
243 |
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1768378818264825856 |