摘要
岛弧火山活动的数值热模拟研究是俯冲带构造热演化研究的重要方面,也是验证地表观测结果的重要方法。选取台湾-吕宋岛弧巴士段内东火山链(EVC)的甘米银活火山和西火山链(WVC)的加拉鄢死火山,根据地质和地球物理条件,进行了有限元热模拟计算。在计算模拟甘米银活火山和加拉鄢死火山现今的热流分布的基础上,分析了二者的差异。模拟结果表明,甘米银活火山顶部至周边30km热流值有明显升高,越靠近火山热流值越高且增加速率越快,岩浆房正上方的热流高达310mW.m-2。加拉鄢死火山顶部及周边热流略有升高,热流增量从周边40km处的小于3mW.m-2缓慢增加到火山顶部的15mW.m-2。
The thermal numerical simulation for island arc volcanic activities is not only an important aspect of the study on tectono-thermal evolution of a subduction zone, but also a critical method to verify the results of field observation. In this study, based on geological and geophysical conditions, we selected the Camiguin active volcano in the east volcano chain （EVC） and the Calayan extinct volcano in the west volcano chain （WVC） along the Bashi Segment of the Taiwan Luzon island arc as our models. Thermal simulations using finite-element numerical method were conducted. During the simulations, we first calculated the present heat flow distribution above the Camiguin active volcano and Calayan extinct volcano, and then analyzed the divergence of the two volcanoes. The simulation results show, from the top of the Camiguin active volcano to 30 km away, the heat flow obviously rises and becomes higher with acceleration when it comes closer to the top of the volcano where the heat flow can reach 310 mW· m^- 2. However, the heat flow on the top of the Calayan extinct volcano and surroundings only rises a little. The heat flow increment increases slowly from below 3 mW · m ^-2 40 km away from the volcano to 15 mW · m^-2 on the top of the volcano.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2013年第1期65-71,共7页
Marine Geology & Quaternary Geology
基金
国家自然科学基金项目(41174085)
中国海陆地质地球物理系列图项目(GZH200900504)
国家重点基础研究规划项目(G2007CB411704)
关键词
热模拟
岩浆房
台湾-吕宋岛弧
thermal simulation
magma chamber
Taiwan-Luzon island arc
