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  4. A 6000-km-long Neo-Tethyan arc system with coherent magmatic flare-ups and lulls in South Asia
 
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A 6000-km-long Neo-Tethyan arc system with coherent magmatic flare-ups and lulls in South Asia

Journal
Geology
Journal Volume
47
Journal Issue
6
Pages
573-576
Date Issued
2019
Author(s)
Zhang X.
Chung S.-L.
Lai Y.-M.
Ghani A.A.
Murtadha S.
Lee H.-Y.
SUN-LIN CHUNG  
DOI
10.1130/G46172.1
URI
https://scholars.lib.ntu.edu.tw/handle/123456789/431815
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066443442&doi=10.1130%2fG46172.1&partnerID=40&md5=e8f1e6e56441e38406732a0f87438f8c
Abstract
Magmatic arcs typically exhibit non-steady-state evolution with episodic flare-ups and lulls, yet the main drivers remain contentious. Situated in the southwest margin of Southeast Asia, Sumatra records a long-lived magmatic arc that is still poorly constrained in age and tempo. Detrital zircon data from Sumatra delineate major arc magmatic pulses at ca. 212, 102-85, 52, and 22-11 Ma. The mid-Cretaceous to early Eocene zircons mostly yield high positive £`Hf(t) values, indicating magma derivation from juvenile sources and matching well with those of the Gangdese batholiths in the southern Lhasa terrane. These similarities substantiate an extended (~6000 km) Neo-Tethyan arc system from southern Tibet to Sumatra that exhibits concurrent magmatic lulls (ca. 150-105 and 85-65 Ma) and flare-ups (ca. 105-85 and 65-40 Ma). The Late Cretaceous magmatic lull coincided with a period of strong regional deformation and increasingly fast northward drift of India, likely attributable to Neo-Tethyan flat slab subduction. Periodic pulses of Neo-Tethyan arc magmatism most likely correlated with repeated steepening and shallowing of slab dip, rather than India-Eurasia convergence rates. ? 2019 Geological Society of America.
Type
journal article

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