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Article: Paleomagnetic data support Early Permian age for the Abor Volcanics in the lower Siang Valley, NE India: Significance for Gondwana-related break-up models
Title | Paleomagnetic data support Early Permian age for the Abor Volcanics in the lower Siang Valley, NE India: Significance for Gondwana-related break-up models | ||||||||
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Authors | |||||||||
Keywords | Artinskian Bhote Khosi Basalts Cimmerian terrane Eastern Syntaxis Gondwana Kiaman Nar Tsum Spilites Panjal Traps Permian Siang Window | ||||||||
Issue Date | 2012 | ||||||||
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes | ||||||||
Citation | Journal Of Asian Earth Sciences, 2012, v. 50, p. 105-115 How to Cite? | ||||||||
Abstract | Confusion 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. © 2012 Elsevier Ltd. | ||||||||
Persistent Identifier | http://hdl.handle.net/10722/146388 | ||||||||
ISSN | 2023 Impact Factor: 2.7 2023 SCImago Journal Rankings: 0.964 | ||||||||
ISI Accession Number ID |
Funding Information: Research Grants to JRA (CERG - HKU7002/05, HKU7001/10) and JCA (CERG - HKU7001/07) supported the fieldwork and laboratory studies. Muraleedharan Nair of the Indian Consular Office in Hong Kong provided valuable assistance and advice. Oken Tayeng (Abor Country Travels and Expeditions) and Nino Dai (Donyi Hanggo Adventure Tours and Travels) are thanked for organizing our field-trips. Rob Van der Voo (University of Michigan) kindly shared information. Ravikant Vadlamani (Indian Institute of Science Education and Research at Kolkata) assisted with a number of questions regarding the Upper Paleozoic rocks of northern India. | ||||||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ali, JR | en_HK |
dc.contributor.author | Aitchison, JC | en_HK |
dc.contributor.author | Chik, SYS | en_HK |
dc.contributor.author | Baxter, AT | en_HK |
dc.contributor.author | Bryan, SE | en_HK |
dc.date.accessioned | 2012-04-24T07:50:54Z | - |
dc.date.available | 2012-04-24T07:50:54Z | - |
dc.date.issued | 2012 | en_HK |
dc.identifier.citation | Journal Of Asian Earth Sciences, 2012, v. 50, p. 105-115 | en_HK |
dc.identifier.issn | 1367-9120 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/146388 | - |
dc.description.abstract | Confusion 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. © 2012 Elsevier Ltd. | en_HK |
dc.language | eng | en_US |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes | en_HK |
dc.relation.ispartof | Journal of Asian Earth Sciences | en_HK |
dc.subject | Artinskian | en_HK |
dc.subject | Bhote Khosi Basalts | en_HK |
dc.subject | Cimmerian terrane | en_HK |
dc.subject | Eastern Syntaxis | en_HK |
dc.subject | Gondwana | en_HK |
dc.subject | Kiaman | en_HK |
dc.subject | Nar Tsum Spilites | en_HK |
dc.subject | Panjal Traps | en_HK |
dc.subject | Permian | en_HK |
dc.subject | Siang Window | en_HK |
dc.subject.mesh | Eocene | - |
dc.subject.mesh | Gondwana | - |
dc.subject.mesh | Magnetization | - |
dc.subject.mesh | Magnetostratigraphy | - |
dc.subject.mesh | Paleolatitude | - |
dc.title | Paleomagnetic data support Early Permian age for the Abor Volcanics in the lower Siang Valley, NE India: Significance for Gondwana-related break-up models | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Ali, JR: jrali@hku.hk | en_HK |
dc.identifier.email | Aitchison, JC: jona@hku.hk | en_HK |
dc.identifier.authority | Ali, JR=rp00659 | en_HK |
dc.identifier.authority | Aitchison, JC=rp00658 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.jseaes.2012.01.007 | en_HK |
dc.identifier.scopus | eid_2-s2.0-84859005201 | en_HK |
dc.identifier.hkuros | 199130 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-84859005201&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 50 | en_HK |
dc.identifier.spage | 105 | en_HK |
dc.identifier.epage | 115 | en_HK |
dc.identifier.isi | WOS:000303431900011 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Ali, JR=7102266465 | en_HK |
dc.identifier.scopusauthorid | Aitchison, JC=7102533858 | en_HK |
dc.identifier.scopusauthorid | Chik, SYS=55058900100 | en_HK |
dc.identifier.scopusauthorid | Baxter, AT=35069077600 | en_HK |
dc.identifier.scopusauthorid | Bryan, SE=7103134872 | en_HK |
dc.identifier.issnl | 1367-9120 | - |