University Of Tasmania

File(s) under permanent embargo

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

journal contribution
posted on 2023-05-21, 05:10 authored by Hu, F, Wu, F-Y, Wang, J-G, Ducea, MN, Chapman, JB, Khin ZawKhin Zaw, Lin, W, Sein, K, Sebastien MeffreSebastien Meffre
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.


Barrick (Australia Pacific) PTY Limited

Indochine Resources Ltd

Kingsgate Consolidated NL

MMG Australia LImited

Monument Mining Limited

Newmont Asia Pacific


Southern Gold Limited

Zinifex Australia Ltd


Publication title

Journal of Asian Earth Sciences



Article number









School of Natural Sciences


Pergamon-Elsevier Science Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb

Rights statement

Copyright 2022 Elsevier Ltd.

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences