Petrogenesis of Bimodal Volcanic Rocks in the Rongbu Area, Southern Tibet: Magmatic Response to the Rifting of Eastern Gondwana

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The study aims to clarify the petrogenesis and tectonic background of bimodal volcanic rocks in the Rongbu area related to the rifting of Eastern Gondwana.
Conducted petrographic and geochemical analyses of bimodal volcanic rocks in Rongbu area.
Performed Sr-Nd-Hf-Pb isotope analysis to characterize volcanic rock origins.
Analyzed the geochemical features of acidic and basic volcanic rocks.
Acidic volcanic rocks are primarily rhyolites with A-type granite geochemical characteristics.
Basaltic rocks exhibit OIB-type basalt traits, indicating mantle influence.
Findings suggest Bimodal volcanic formation is linked to initial continental rifting and the activity of the Kerguelen mantle plume.

Study illustrates magmatic processes in bimodal volcanic rocks, indicating complex tectonic evolution in Southern Tibet.

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Jiang et al. (2026) studied this question.

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