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

Zhang, Xiaoran and Chung, Sun-Lin and Lai, Yu-Ming and Ghani, Azman Abd and Murtadha, Sayed and Lee, Hao-Yang and Hsu, Chun-Chieh (2019) A 6000-km-long Neo-Tethyan arc system with coherent magmatic flare-ups and lulls in South Asia. Geology, 47 (6). pp. 573-576. ISSN 0091-7613, DOI https://doi.org/10.1130/G46172.1.

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Official URL: https://doi.org/10.1130/G46172.1


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 εHf(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.

Item Type: Article
Funders: Academia Sinica and the Ministry of Science and Technology (MOST­107­2745­M­001­002­ASP), Taiwan
Uncontrolled Keywords: Convergence rates; Detrital zircon; Flat-slab subductions; Late cretaceous; Mid-Cretaceous; Non steady-state; Periodic pulse; Regional deformations
Subjects: Q Science > Q Science (General)
Q Science > QE Geology
Divisions: Faculty of Science > Department of Geology
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 01 Nov 2019 01:36
Last Modified: 01 Nov 2019 01:36
URI: http://eprints.um.edu.my/id/eprint/22900

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