Geochemical characteristics and geological significance of granite in the Aligendaoruo area
Aligendaoruo area is located in the eastern part of the northern margin of Qaidam basin with a large number of Middle and Late Devonian granite distributed.The petrological and minera-logical characteristics,major and trace elements as well as geochemical characteristics of rare earth elements in the area are explored to reveal the geological background,granite petrogenesis and geo-logical structure characteristics of the area.The results show that the granite in the area is characte-rized by high silicon,high potassium,rich aluminum and rich sodium.Nb,Sr,P and Ti high field strength elements are relatively deficient,while Th,Ba and K large ion lithophile elements are rela-tively enriched.The area is rich in light rare earth elements,while heavy rare earth elements are rela-tively depleted.The standardized distribution curve of chondrite shows an obvious right-leaning"seagull"type,with obvious negative Eu anomaly.The granite in the area is mainly peraluminous calc-alkaline 1-type granite,with a small portion being high potassium,high silicon and aluminum-rich A-type granite.The research suggests that the Middle and Late Devonian granite was formed in the post-orogenic tectonic setting of intracontinental extension stage,which is of great geological sig-nificance for understanding the petrogenesis of granite and the prospecting direction of rare metals in the area.
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