Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision

The migration of arc magmatism that is a fundamental aspect of plate tectonics may reflect the complex interaction between subduction zone processes and regional tectonics. Here we report new observations on volcanic migration from northwestern Sumatra, in the westernmost Sunda arc, characterized by...

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Main Authors: Lai, Yu-Ming, Chung, Sun-Lin, Ghani, Azman A., Murtadha, Sayed, Lee, Hao-Yang, Chu, Mei-Fei
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Published: Geological Society of America 2021
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Online Access:http://eprints.um.edu.my/28433/
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spelling my.um.eprints.284332022-08-08T06:15:04Z http://eprints.um.edu.my/28433/ Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision Lai, Yu-Ming Chung, Sun-Lin Ghani, Azman A. Murtadha, Sayed Lee, Hao-Yang Chu, Mei-Fei Q Science (General) QE Geology The migration of arc magmatism that is a fundamental aspect of plate tectonics may reflect the complex interaction between subduction zone processes and regional tectonics. Here we report new observations on volcanic migration from northwestern Sumatra, in the westernmost Sunda arc, characterized by an oblique convergent boundary between the Indo-Australian and Eurasian plates. Our study indicates that in northwestern Sumatra, volcanism ceased at 15-10 Ma on the southern coast and reignited to form a suite of active volcanoes that erupt exclusively to the north of the trench-parallel Sumatran fault. Younger volcanic rocks from the north are markedly more enriched in K2O and other highly incompatible elements, delineating a geochemical variation over space and time similar to that in Java and reflecting an increase in the Benioff zone depth. We relate this mid-Miocene volcanic migration in northwestern Sumatra to the far-field effect of propagating extrusion tectonics driven by the India-Eurasia collision. The extrusion caused regional deformation southward through Myanmar to northwestern Sumatra and thus transformed the oblique subduction into a dextral motion-governed plate boundary. This tectonic transformation, associated with opening of the Andaman Sea, is suggested to be responsible for the volcanic migration in northwestern Sumatra. Geological Society of America 2021-03-04 Article PeerReviewed Lai, Yu-Ming and Chung, Sun-Lin and Ghani, Azman A. and Murtadha, Sayed and Lee, Hao-Yang and Chu, Mei-Fei (2021) Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision. Geology, 49 (6). pp. 713-717. ISSN 0091-7613, DOI https://doi.org/10.1130/G48568.1 <https://doi.org/10.1130/G48568.1>. 10.1130/G48568.1
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic Q Science (General)
QE Geology
spellingShingle Q Science (General)
QE Geology
Lai, Yu-Ming
Chung, Sun-Lin
Ghani, Azman A.
Murtadha, Sayed
Lee, Hao-Yang
Chu, Mei-Fei
Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision
description The migration of arc magmatism that is a fundamental aspect of plate tectonics may reflect the complex interaction between subduction zone processes and regional tectonics. Here we report new observations on volcanic migration from northwestern Sumatra, in the westernmost Sunda arc, characterized by an oblique convergent boundary between the Indo-Australian and Eurasian plates. Our study indicates that in northwestern Sumatra, volcanism ceased at 15-10 Ma on the southern coast and reignited to form a suite of active volcanoes that erupt exclusively to the north of the trench-parallel Sumatran fault. Younger volcanic rocks from the north are markedly more enriched in K2O and other highly incompatible elements, delineating a geochemical variation over space and time similar to that in Java and reflecting an increase in the Benioff zone depth. We relate this mid-Miocene volcanic migration in northwestern Sumatra to the far-field effect of propagating extrusion tectonics driven by the India-Eurasia collision. The extrusion caused regional deformation southward through Myanmar to northwestern Sumatra and thus transformed the oblique subduction into a dextral motion-governed plate boundary. This tectonic transformation, associated with opening of the Andaman Sea, is suggested to be responsible for the volcanic migration in northwestern Sumatra.
format Article
author Lai, Yu-Ming
Chung, Sun-Lin
Ghani, Azman A.
Murtadha, Sayed
Lee, Hao-Yang
Chu, Mei-Fei
author_facet Lai, Yu-Ming
Chung, Sun-Lin
Ghani, Azman A.
Murtadha, Sayed
Lee, Hao-Yang
Chu, Mei-Fei
author_sort Lai, Yu-Ming
title Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision
title_short Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision
title_full Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision
title_fullStr Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision
title_full_unstemmed Mid-Miocene volcanic migration in the westernmost Sunda arc induced by India-Eurasia collision
title_sort mid-miocene volcanic migration in the westernmost sunda arc induced by india-eurasia collision
publisher Geological Society of America
publishDate 2021
url http://eprints.um.edu.my/28433/
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