Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/14845
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dc.contributor.authorAli, Jason Ren
dc.contributor.authorAitchison, Jonathan Cen
dc.contributor.authorChik, Sam Y Sen
dc.contributor.authorBaxter, Alanen
dc.contributor.authorBryan, Scott Een
dc.date.accessioned2014-04-28T15:26:00Z
dc.date.issued2012en
dc.identifier.citationJournal of Asian Earth Sciences, v.50, p. 105-115en
dc.identifier.issn1878-5786en
dc.identifier.issn1367-9120en
dc.identifier.urihttps://hdl.handle.net/1959.11/14845en
dc.description.abstractConfusion exists as to the age of the Abor Volcanics of NE India. Some consider the unit to have been emplaced in the Early Permian, others the Early Eocene, a difference of ~230 million years. The divergence in opinion is significant because fundamentally different models explaining the geotectonic evolution of India depend on the age designation of the unit. Paleomagnetic data reported here from several exposures in the type locality of the formation in the lower Siang Valley indicate that steep dipping primary magnetizations (mean = 72.7 ± 6.2°, equating to a paleo-latitude of 58.1°) are recorded in the formation. These are only consistent with the unit being of Permian age, possibly Artinskian based on a magnetostratigraphic argument. Plate tectonic models for this time consistently show the NE corner of the sub-continent >50°S; in the Early Eocene it was just north of the equator, which would have resulted in the unit recording shallow directions. The mean declination is counter-clockwise rotated by ~94°, around half of which can be related to the motion of the Indian block; the remainder is likely due local Himalayan-age thrusting in the Eastern Syntaxis. Several workers have correlated the Abor Volcanics with broadly coeval mafic volcanic suites in Oman, NE Pakistan-NW India and southern Tibet-Nepal, which developed in response to the Cimmerian block peeling-off eastern Gondwana in the Early-Middle Permian, but we believe there are problems with this model. Instead, we suggest that the Abor basalts relate to India-Antarctica/India-Australia extension that was happening at about the same time. Such an explanation best accommodates the relevant stratigraphical and structural data (present-day position within the Himalayan thrust stack), as well as the plate tectonic model for Permian eastern Gondwana.en
dc.languageenen
dc.publisherPergamonen
dc.relation.ispartofJournal of Asian Earth Sciencesen
dc.titlePaleomagnetic data support Early Permian age for the Abor Volcanics in the lower Siang Valley, NE India: Significance for Gondwana-related break-up modelsen
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.jseaes.2012.01.007en
dc.subject.keywordsTectonicsen
dc.subject.keywordsMagnetism and Palaeomagnetismen
local.contributor.firstnameJason Ren
local.contributor.firstnameJonathan Cen
local.contributor.firstnameSam Y Sen
local.contributor.firstnameAlanen
local.contributor.firstnameScott Een
local.subject.for2008040313 Tectonicsen
local.subject.for2008040406 Magnetism and Palaeomagnetismen
local.subject.seo2008970104 Expanding Knowledge in the Earth Sciencesen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailjrali@hku.hken
local.profile.emailabaxter9@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20140317-102235en
local.publisher.placeUnited Kingdomen
local.format.startpage105en
local.format.endpage115en
local.peerreviewedYesen
local.identifier.volume50en
local.title.subtitleSignificance for Gondwana-related break-up modelsen
local.contributor.lastnameAlien
local.contributor.lastnameAitchisonen
local.contributor.lastnameChiken
local.contributor.lastnameBaxteren
local.contributor.lastnameBryanen
dc.identifier.staffune-id:abaxter9en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:15060en
local.identifier.handlehttps://hdl.handle.net/1959.11/14845en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitlePaleomagnetic data support Early Permian age for the Abor Volcanics in the lower Siang Valley, NE Indiaen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 813<br />Views: 834<br />Downloads: 0en
local.search.authorAli, Jason Ren
local.search.authorAitchison, Jonathan Cen
local.search.authorChik, Sam Y Sen
local.search.authorBaxter, Alanen
local.search.authorBryan, Scott Een
local.uneassociationUnknownen
local.year.published2012en
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