岩石矿物学杂志2026，Vol.45Issue(2)：378-392,15.DOI:10.20086/j.cnki.yskw.2026.5107
大陆碰撞造山带脱碳机制及其对古元古代深部碳循环的启示
Decarbonation mechanisms in continental collisional orogens:Implications for deep carbon cycling during the Paleoproterozoic
摘要
Abstract
Continental collisional orogens represent a critical component of Earth's deep carbon cycle,with their decarbonation processes exerting a profound influence on global carbon budgets and long-term climate evolution.In contrast to oceanic subduction zones,continental collision belts are characterized by higher geothermal gradients,more felsic(sialic)compositions,and weaker fluid activity.Their decarbonation mechanisms are dominated by metamorphic reaction-driven decarbonation and anatexis-induced carbon release.This contribution systematically reviews decarbonation mechanisms in continental collisional orogens,with a focus on thermodynamic modeling of Paleoproterozoic"hot"orogens(exemplified by the Khondalite Belt,North China Craton)to elucidate carbon cycling characteristics under early plate tectonic regimes.Modeling results reveal that high geothermal gradients promoted intense and rapid metamorphic decarbonation during the early prograde stage in Paleoproterozoic orogens,whereas Phanerozoic cold orogens experienced decarbonation predominantly during exhumation.Under high-temperature and fluid-present conditions,carbonate rocks may undergo partial melting(generating anatectic carbonatites).These carbonatitic melts are highly mobile,and their degassing during formation,ascent,and interaction with country rocks constitutes a significant pathway for carbon release.We propose that the widespread continental collisional orogeny and supercontinent assembly events in the late Paleoproterozoic,due to their elevated thermal regimes,may have triggered large-scale carbon emissions,profoundly influencing contemporary global carbon cycling and climate evolution.The associated carbon fluxes quantitative constraints are needed in future models.关键词
古元古代/造山带碳循环/变质脱碳/深熔碳酸岩/热力学模拟Key words
Paleoproterozoic/orogenic carbon cycle/metamorphic decarbonation/anatectic carbonatite/thermo-dynamic modeling分类
天文与地球科学引用本文复制引用
邹雷,张立飞,郭敬辉,夏小平,张军波,刘平华..大陆碰撞造山带脱碳机制及其对古元古代深部碳循环的启示[J].岩石矿物学杂志,2026,45(2):378-392,15.基金项目
国家重点研发计划项目(2023YFF0803802) （2023YFF0803802）
中国博士后科学基金项目(GZB20230008,2023M740047) （GZB20230008,2023M740047）
中国地质调查局地质调查项目(DD20242923,DD20240102205) National Key Research and Development Program of China(2023YFF0803802) （DD20242923,DD20240102205）
China Postdoctor-al Science Foundation(GZB20230008,2023M740047) （GZB20230008,2023M740047）
China Geological Survey Project(DD20242923,DD20240102205) （DD20242923,DD20240102205）
