云南宁洱-通关火山区深部碳排放通量与成因

大气二氧化碳浓度是自然过程和人类活动共同作用的结果。在限制人类活动碳排放的同时，也需要研究自然过程碳排放通量，以获得自然过程对大气圈碳收支平衡相对贡献的准确评价。前人研究重点关注了洋中脊、俯冲带和大陆裂谷构造背景的火山和构造碳排放，但对大陆碰撞造山带深部碳排放通量与成因的研究还非常薄弱。青藏高原及其周边地区是全球独一无二的大陆碰撞造山带，强烈的构造和岩浆活动为开展深部碳排放研究提供了理想对象。本项目选择青藏高原东南边缘的云南宁洱-通关火山区，针对区内出露的温泉、土壤微渗漏、火山岩等研究对象，利用野外原位测量、气体地球化学和岩石地球化学等方法，结合区域构造-岩浆活动历史，探讨高原边缘扩张过程中的深部碳排放通量、来源与演化过程，为理解青藏高原地质演化不同时段的深部碳排放特征及其碳源/碳汇效应提供科学依据。

Atmospheric CO2 concentration is the result of natural processes and human activities. The carbon flux of natural processes is required to accurately evaluate its contribution to the atmospheric CO2 budget. Previous studies mainly focused on CO2 emissions from the mid-ocean ridge, subduction zone, and continental rift, but CO2 emissions of the continental collision zone are still poorly constrained. The Tibetan Plateau represents the unique continental collision zone on Earth, where the intensive tectonic and magmatic activities provide a good opportunity for the study of deep carbon emissions. Taking hot springs, soil microseepage and volcanic rocks of the Ning’er-Tongguan volcanic field, southeastern Tibetan Plateau, as research target, we will carry out in-situ CO2 flux measurement and studies of gas geochemistry and whole-rock geochemistry to constrain the origin and flux of deep carbon emissions in the volcanically and tectonically active region. Combined with regional tectonic and magmatic history, we will provide scientific data for understanding the features of deep carbon emissions in response to the expansion of the Tibetan Plateau, and its role as a carbon source or sink during different periods of the geo-tectonic evolution.