The trace element spider diagrams clearly display Nb-Ti negative anomalies, which is similar to the cases with the alkaline basalts in Grenada and L. Antilles. The andesite is linked to the basalt of Takezhale ophiolite belt.

• 微量元素蛛网图显示其均具Nb-Ti负异常,与Grenada和LAntilles那种碱性玄武岩类相当,且与塔克札勒蛇绿岩带中的玄武岩有成因联系。