The volcanism in Qiangtang Basin is very frequent due to the divergence and subduction of the various plates.The study indicates that these volcanics are formed in different tectonic settings:1)Hercynian volcanics are...The volcanism in Qiangtang Basin is very frequent due to the divergence and subduction of the various plates.The study indicates that these volcanics are formed in different tectonic settings:1)Hercynian volcanics are mainly basalts and are formed in the intraplate and intercontinental rift.2)Indosinian volcanics markedly vary in the distribution and composition and reflect transitional MORB and island arc environments respectively.3)Yanshanian volcanics consist predominantly of basalts,andesites,dacites and rhyolites and are characterized by calc-alkaline volcanic suite, indicating island arc setting.4)Himalayan volcanics are complicated and associated with intraplate orogency.The volcanism provides important tectonic information for recognizing the evolution of Qiangtang Basin.展开更多
文摘The volcanism in Qiangtang Basin is very frequent due to the divergence and subduction of the various plates.The study indicates that these volcanics are formed in different tectonic settings:1)Hercynian volcanics are mainly basalts and are formed in the intraplate and intercontinental rift.2)Indosinian volcanics markedly vary in the distribution and composition and reflect transitional MORB and island arc environments respectively.3)Yanshanian volcanics consist predominantly of basalts,andesites,dacites and rhyolites and are characterized by calc-alkaline volcanic suite, indicating island arc setting.4)Himalayan volcanics are complicated and associated with intraplate orogency.The volcanism provides important tectonic information for recognizing the evolution of Qiangtang Basin.
