陆内穿地壳岩浆系统及其去气作用和环境效应  

Degassing and environmental effect of intracontinental transcrustal magmatic system

作　　者：蒋昌宏 杜德宏 王孝磊[1] JIANG ChangHong;DU DeHong;WANG XiaoLei(State Key Laboratory for Mineral Deposits Research,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China)

机构地区：[1]内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210023

出　　处：《岩石学报》2022年第5期1360-1374,共15页Acta Petrologica Sinica

基　　金：国家自然科学基金项目(92162322、42025202)资助。

摘　　要：岩浆作用是联系地球深部与表层碳储库的桥梁,是全球碳循环的重要一环。揭示岩浆作用与碳循环之间的关系对理解地球系统演化过程中的环境效应和气候变化有重要意义。本文综述了前人在岩浆系统研究的重要进展,介绍了陆内穿地壳岩浆系统,梳理了从幔源岩浆底侵和地壳熔融,到岩浆上升、累积、混合、分异直至喷出等物理化学过程,构建了地壳岩浆活动的统一框架。岩浆过程同时控制着挥发分行为,岩浆自身的去气作用将地球深部挥发分带到地表,而接触热变质作用可改造围岩并将其中的碳脱出。基于穿地壳岩浆系统,本文系统阐述了岩浆挥发分的来源、组成、行为,及其释放到大气中对气候与环境产生的潜在影响。尤其是针对中国华南地区分布的大量陆内中生代的侵入岩和火山岩,结合同期广泛分布的巨厚碳酸盐岩,介绍和展望了陆内岩浆系统和去气作用的联系及环境效应,提出该时期的岩浆活动及其与碳酸盐岩的反应很可能对局部乃至全球的气候造成了显著的影响,该领域有较大研究潜力。Magmatism is a bridge that links the deep and the surface of the carbon reservoirs of the Earth,and it also constitutes an important part of the global carbon cycle.Understanding the relationship between magmatism and the carbon cycle is of great significance for us to understand the environmental effects and climate change.This paper summarizes the previous progress in the research of magmatic systems,introduces the intracontinental transcrustal magmatic system,and clarifies the physicochemical processes of mantle-derived magmatic underplating,crustal melting,magmatic rise,accumulation,mixing,differentiation and eruption.The unified framework of crustal magmatism is constructed.The magmatic process also controls the behavior of volatile matter.The degassing of magma itself brings the volatiles from the deep part of the Earth to the surface,and the contact thermal metamorphism removes the carbon from the surrounding rocks.Based on the transcrustal magmatic system,this paper systematically expounds the source,composition,and behavior of magmatic volatiles,as well as the potential impact on the climate and environment.Many Mesozoic intrusive and volcanic rocks are distributed in the inland of South China,and huge thick carbonate strata are also widely distributed.This means that the intracontinental magmatism and its reaction with carbonate rocks in this period may have a significant impact on the local and even global climate.This paper makes an objective introduction and prospect of the magmatic system and degassing,which is of great scientific significance.

关 键 词：花岗岩 穿地壳岩浆系统 去气作用 环境效应 陆内 

分 类 号：P588.11[天文地球—岩石学]