长白山天池火山的岩浆挥发份释放规模与成因

由于岩浆脱气能够快速地响应火山喷发并且持续地向大气圈释放温室气体，挥发份的释放规模与成因已成为深部碳循环与火山监测研究领域的关键科学问题。长白山天池火山是一座具有潜在喷发危险的巨型休眠火山，岩浆类型多样且地表水热活动强烈，亟需深入研究其岩浆脱气特征与火山活动状态。本项目拟选择长白山天池火山作为研究区，利用岩石学与地表观测方法（包括温泉与土壤微渗漏气体的实地测量方法）开展喷发期与间歇期的岩浆挥发份释放规模与成因研究，探讨天池火山不同阶段的岩浆挥发份释放特征、成因及其对火山监测的意义，为全球自然因素碳排放总量估算研究提供来自中国火山的新数据。

Magma degassing exhibits rapid response to volcanic eruption and continuously releases greenhouse gases into the atmosphere, and thus outgassing flux and genesis of volatiles have been important scientific issues for deep carbon cycle and volcanic monitoring. Tianchi volcano, Mt. Changbai, is a quiescent volcano with potential eruption danger, where different types of volcanic rocks and surface hydrothermal activities are extensively distributed. Therefore, it is highly necessary to study magma degassing mechanism and the state of magma chamber beneath Tianchi volcano. This proposal will focus on the Tianchi volcano to investigate the outgassing fluxes and origin of magmatic volatiles by the method of petrological reconstruction and surface observation (e.g., in-situ measurement of gases from hot springs and soil). Our project will discuss (1) the features of magma degassing during different periods and of different magma types, (2) the volatile origin and its implications for probing deep magmatic activities, and (3) new data of carbon degassing from Chinese volcanoes that would contribute to global carbon budget.