The Tonglu volcano-intrusive complex belongs to a calci-alkalic rock series. The geochemistry of major and minor elements in the rocks is characteristic of the differentiation and the evolution of the calci-alkalic se...The Tonglu volcano-intrusive complex belongs to a calci-alkalic rock series. The geochemistry of major and minor elements in the rocks is characteristic of the differentiation and the evolution of the calci-alkalic series. The rare-earth distribution patterns in the rocks and minerals indicate that rhyolitic, rhyodacitic and quartz ttachyandesitic magmas responsible for the volcano-intrusive complex are comagmatic. The Rb-Sr isotopic relationship in the rocks suggests that the earliest volcanic activity in western Zhejiang may commence at Middle Jurassic. The magma responsible for the Tonglu volcano-intrusive complex originated from partil melting of the lower crust. The derivation of upper mantle material was introduced upwards through deep faults, which would accelerate partial melting of the lower crust.This magma seems to have been contaminated slightly by upper crustal material during the process of upward intrusion.展开更多
火山喷发是地球上最壮观、最复杂的自然现象之一,对人类、大气圈、水圈和地球本身都会产生全球性的重大影响.地球陆地上有大约1500座活火山(即1万年内喷发过的火山),有史以来记录的火山喷发约600座,夺走了超过100万人的生命,并多次改变...火山喷发是地球上最壮观、最复杂的自然现象之一,对人类、大气圈、水圈和地球本身都会产生全球性的重大影响.地球陆地上有大约1500座活火山(即1万年内喷发过的火山),有史以来记录的火山喷发约600座,夺走了超过100万人的生命,并多次改变人类社会的历史进程.目前,全世界每年有大约60座火山处于喷发状态,超过8亿人生活在活火山附近(Caricchi et al.,2021).根据对两极冰芯的研究,火山爆发指数(VEI)达到7级的喷发大约每625年出现一次,VEI8的超级喷发大约每14300年发生一次,未来一百年内发生VEI7级以上爆发式剧烈火山喷发的可能性为六分之一(Lin et al.,2021).展开更多
文摘The Tonglu volcano-intrusive complex belongs to a calci-alkalic rock series. The geochemistry of major and minor elements in the rocks is characteristic of the differentiation and the evolution of the calci-alkalic series. The rare-earth distribution patterns in the rocks and minerals indicate that rhyolitic, rhyodacitic and quartz ttachyandesitic magmas responsible for the volcano-intrusive complex are comagmatic. The Rb-Sr isotopic relationship in the rocks suggests that the earliest volcanic activity in western Zhejiang may commence at Middle Jurassic. The magma responsible for the Tonglu volcano-intrusive complex originated from partil melting of the lower crust. The derivation of upper mantle material was introduced upwards through deep faults, which would accelerate partial melting of the lower crust.This magma seems to have been contaminated slightly by upper crustal material during the process of upward intrusion.
文摘火山喷发是地球上最壮观、最复杂的自然现象之一,对人类、大气圈、水圈和地球本身都会产生全球性的重大影响.地球陆地上有大约1500座活火山(即1万年内喷发过的火山),有史以来记录的火山喷发约600座,夺走了超过100万人的生命,并多次改变人类社会的历史进程.目前,全世界每年有大约60座火山处于喷发状态,超过8亿人生活在活火山附近(Caricchi et al.,2021).根据对两极冰芯的研究,火山爆发指数(VEI)达到7级的喷发大约每625年出现一次,VEI8的超级喷发大约每14300年发生一次,未来一百年内发生VEI7级以上爆发式剧烈火山喷发的可能性为六分之一(Lin et al.,2021).
