New zircon geochronological,petrologic,elemental and Sr-Nd-Hf isotopic data for the felsic igneous rocks from the Truong Son zone in NE Laos constrain the temporal-spatial relationship with the SW China and the Paleotethyan tectonic evolution in SE Asia.Geochronological data show that the felsic rocks in NE Laos yield crystallization ages of281-265Ma and can be divided into three groups.
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