俯冲碳酸盐再循环过程及其研究意义  

The recycling process of subducted carbonate and its effects:A review

作　　者：梁俊琪 国增利 杜瑾雪[1] 喻锦泓 陈舟倩 LIANG Jun-qi;GUO Zeng-li;DU Jin-xue;YU Jin-hong;CHEN Zhou-qian(School of Earth Science and Resources,China University of Geosciences,Beijing 100083,China;School of Earth and Space Sciences,Peking University,Beijing 100871,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]北京大学地球与空间科学学院,北京100871

出　　处：《岩石矿物学杂志》2025年第2期398-414,共17页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金指南引导类原创探索项目(42150104)。

摘　　要：碳酸盐是俯冲板块输入地球深部含碳物质中的关键成分。俯冲碳酸盐的再循环被认为是俯冲带深部碳循环的重要过程。在俯冲过程中,碳酸盐经历脱碳反应,释放含碳流体或熔体进入地幔,这对地幔的物质组成和氧化还原状态产生了深远的影响。目前对俯冲碳酸盐再循环过程的理解主要依赖于有限的(超)高压变质岩和深源地幔捕虏体的研究,以及通过高温高压实验岩石学和分子动力学模拟等方法进行探索。深入了解俯冲碳酸盐再循环过程对于揭示碳在地球深部的地球化学和动力学行为具有重要意义。本文综述了俯冲碳酸盐再循环过程,并结合全球俯冲带的热结构,讨论了不同脱碳机制下碳的存在状态和迁移方式,包括变质反应脱碳、流体溶解脱碳、熔融脱碳和氧化还原脱碳过程,阐述了这些过程对地球深层与浅层氧化过程的影响。Carbonates play a crucial role in transporting surface carbon-bearing materials into the Earth's deep mantle through subduction.The recycling process of subducted carbonates is considered a pivotal process in the deep carbon cycle within subduction zones.During subduction,carbonates undergo decarbonation reactions to varying extents,releasing carbon-bearing fluids or melts into the mantle,thereby significantly impacting its composition and redox state.Today our comprehension of the carbonate recycling process in subduction zones largely stems from restricted investigations of(ultra)high-pressure metamorphic rocks,mantle xenoliths of different depths,experimental petrology and molecular dynamics conducted under conditions of high temperature and high pressure.A thorough understanding of the processes involved in subducting carbonate recycling is crucial for deciphering the geochemical and dynamic behavior of carbon in the deep Earth.This paper provides a comprehensive review of the subducting carbonate recycling process.It examines various decarbonization mechanisms,including metamorphic decarbonation,dissolution decarbonation,melting decarbonation,and redox decarbonation.By integrating these mechanisms with the thermal structure of global subduction zones,the paper investigates the distribution of carbon states and its migration patterns.Furthermore,it explores the impacts of these processes on the oxidation processes within both shallow and deep Earth environments.

关 键 词：俯冲碳酸盐 深部碳循环 浅表氧化 

分 类 号：P584[天文地球—岩石学]