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Newly discovered Early Carboniferous and Late Permian magmatic rocks in eastern Myanmar: implications for the tectonic evolution of the eastern Paleo-Tethys

Citation

Hu, F and Wu, F-Y and Wang, J-G and Ducea, MN and Chapman, JB and Zaw, K and Lin, W and Sein, K and Meffre, S, Newly discovered Early Carboniferous and Late Permian magmatic rocks in eastern Myanmar: implications for the tectonic evolution of the eastern Paleo-Tethys, Journal of Asian Earth Sciences, 227 Article 105093. ISSN 1367-9120 (2022) [Refereed Article]

Copyright Statement

Copyright 2022 Elsevier Ltd.

DOI: doi:10.1016/j.jseaes.2022.105093

Abstract

Eastern Myanmar is located at the junction of the Changning-Menglian and Chiang Rai-Chiang Mai zone and is a crucial region for constraining the evolution of the eastern Paleo-Tethys. This study presents new zircon U-Pb geochronological, mineral and whole-rock geochemical, and Sr-Nd-Hf-O isotopic data for magmatic rocks from the Sukhothai arc in eastern Myanmar. The rock suites analyzed include 360–355 Ma basaltic rocks and trondhjemitic dikes, and 257–254 Ma volcanic rocks and gabbroic cumulates. The basaltic rocks were derived from partial melting of mélange pair with peridotite and experienced assimilation and fractional crystallization (AFC). The trondhjemitic dikes were formed by partial melting of the basaltic rocks and experienced fractional crystallization at shallow depth. We suggest that andesite and dacite were derived from partial melting of depleted mantle wedge and underwent AFC process. The gabbroic cumulates are a crystallizing phase associated with the melts that produced the coeval volcanic rocks. We propose that eastern Myanmar, Central Tibet, SW Yunnan and Southeast Asia share a similar three-staged magmatic history, forming a ∼ 4000 km long magmatic belt. Stage I records the magmatic events related to subduction of the eastern Paleo-Tethys Ocean during the Early Carboniferous. A back-arc basin was opened during the Late Carboniferous, and extensive subduction-related magmatism was followed since the Permian. Stage II records the igneous rocks formed during the final amalgamation between the Indochina and Sibumasu Blocks during the Late Permian to Middle Triassic. Stage III is defined by the post-collisional magmatism distributed across the suture zone during the Late Triassic.

Item Details

Item Type:Refereed Article
Keywords:Myanmar, zircon, Eastern Myanmar, Paleo-Tethys, magmatic rocks, petrogenesis, tectonic evolution
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Zaw, K (Professor Khin Zaw)
UTAS Author:Meffre, S (Dr Sebastien Meffre)
ID Code:148490
Year Published:2022
Deposited By:CODES ARC
Deposited On:2022-01-14
Last Modified:2022-04-22
Downloads:0

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