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Motion of Nubia relative to Antarctica since 11 Ma: Implications for Nubia-Somalia, Pacific–North America, and India-Eurasia motion

2006; Geological Society of America; Volume: 34; Issue: 6 Linguagem: Inglês

10.1130/g22463.1

1943-2682

Jean‐Yves Royer, Richard G. Gordon, B. C. Horner-Johnson,

Geological and Geochemical Analysis

Research Article| June 01, 2006 Motion of Nubia relative to Antarctica since 11 Ma: Implications for Nubia-Somalia, Pacific–North America, and India-Eurasia motion Jean-Yves Royer; Jean-Yves Royer 1Centre National de la Recherche Scientifique–Université de Bretagne Occidentale Domaines Océaniques, Institut Universitaire Européen de la Mer, Place Copernic, 29280 Plouzané, France Search for other works by this author on: GSW Google Scholar Richard G. Gordon; Richard G. Gordon 2 Department of Earth Science, Rice University, Houston, Texas 77005, USA Search for other works by this author on: GSW Google Scholar Benjamin C. Horner-Johnson Benjamin C. Horner-Johnson 2 Department of Earth Science, Rice University, Houston, Texas 77005, USA Search for other works by this author on: GSW Google Scholar Geology (2006) 34 (6): 501–504. https://doi.org/10.1130/G22463.1 Article history received: 24 Nov 2005 rev-recd: 23 Jan 2006 accepted: 03 Feb 2006 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jean-Yves Royer, Richard G. Gordon, Benjamin C. Horner-Johnson; Motion of Nubia relative to Antarctica since 11 Ma: Implications for Nubia-Somalia, Pacific–North America, and India-Eurasia motion. Geology 2006;; 34 (6): 501–504. doi: https://doi.org/10.1130/G22463.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Recent estimates of the rotation between Nubia and Somalia have resulted in disparate poles of rotation for the motion since 3.16 Ma (southwest of South Africa) compared with that since 11.03 Ma (near the east tip of Brazil). Here we use magnetic anomaly profiles unavailable in prior Nubia-Antarctica motion studies to significantly revise the estimate of the rotation between Nubia and Antarctica since 11.03 Ma. We use this newly estimated rotation to construct revised estimates of Nubia-Somalia, Pacific–North America, and India-Eurasia motion. The new Nubia-Somalia rotation indicates substantial displacement of Somalia relative to Nubia over the past 11.03 m.y.: 129 ± 62 km extensional, 90 ± 42 km right-lateral transtensional, and 52 ± 21 km right-lateral transtensional near the northern extremity of the East African Rift, the northern Mozambique Basin, and the Andrew Bain Fracture Zone complex, respectively. The substantial rotation between Nubia and Somalia implies that prior plate motion estimates based on a circuit through Africa are biased by 60–85 km at 11.03 Ma and perhaps by much more for earlier reconstructions. Our results imply that India-Eurasia motion since 11.03 Ma has been ∼12% (∼5 mm yr−1) slower than, and ∼20° clockwise of, estimates that neglect Nubia-Somalia motion. Our results further imply that Pacific–North America displacement since 11.03 Ma has been 5°–10° clockwise of prior estimates and require 58–75 km less extensional displacement across the Basin and Range since 11.03 Ma than inferred before. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.