The Geochemical Features,Zircon U-Pb Dating and Significance of Tianhu Rock Group Amphibolites
The Tianhu Rock Group contains a widespread distribution of amphibolites.This study investigates the geol-ogy,petrology,geochemistry,and geochronology of the amphibolites in the Tianhu Rock Group.The results indicate that the protolith of the Tianhu Rock Group's amphibolites is a metamorphosed mafic volcanic rock,exhibiting complex geo-chemical characteristics.Zircon U-Pb dating suggests that the protolith likely formed during the Proterozoic(1,731±33 Ma)and subsequently underwent metamorphism in the Mesoproterozoic.Integrative analysis suggests the presence of early Proterozoic magmatic activity in the exposed areas of the Tianhu Rock Group in eastern Tianshan,with a possible Archean basement.The amphibolites have experienced an extended and complex tectonic evolution,comparable to that of the Kuruktag region.Both regions underwent the assembly and breakup of the Columbia supercontinent,with the am-phibolites in particular representing an early Mesoproterozoic product of Columbia's disintegration.This progression re-flects the tectonic transition from the breakup of Columbia to the emergence of the Rodinia supercontinent.
Tianhu Rock GroupAmphibolitesZir-con U-Pb datingGeochemical characteristicsSignificance
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