郯庐断裂带中段幔源包体单矿物中的气体释放特征与成因  

Degassing Characters and Its Origins of Mantle Aenoliths of Yishu Fracture Zone

作　　者：马锦龙[1] 陶明信[1] 叶先仁[1] 张小军[1] 

机构地区：[1]中国科学院兰州地质研究所气体地球化学重点实验室

出　　处：《沉积学报》2004年第1期176-182,共7页Acta Sedimentologica Sinica

基　　金：国家 973项目 (编号 :G1 9990 4 330 9);国家自然科学基金项目(批准号 :49972 0 81 )资助

摘　　要：地幔流体对探讨地球深部地质作用意义重大。对山东境内幔源包体矿物的分步加热表明其气体的释放有一定的规律性 :随温度升高 ,总释气量逐渐增加 ,至 6 5 0～ 80 0℃出现释气峰 ,随后释气量逐渐降低。气体各主要组分的释放特征是 :5 0 0℃总有CH4释气峰 ;随温度升高 ,H2 释放呈增加趋势 ,而CO2 呈降低趋势 ,反映其各自赋存状态的差异和加热过程中可能发生的相互转化作用。根据各温度段气体组成特征 ,单矿物的释气特征可明显分为三个阶段 。It is very important to study the mantle fluids for understanding deep geologic processes within the earth. There are following rules for degassing of mantle fluids by step-heating for the mantle xenoliths of Shandong province: ①the degassing characters of primary mantle fluid components are different and they are: the degassing peak value for CH 4 are always at 500℃, and while more H 2 were degassed with higher temperature as less CO 2 were released;②three type fluids degassed in different temperature stage, such as 350～500℃,650～800℃ and 950～1100℃, implying different evolving stage fluids, were recognized.

关 键 词：地幔流体 分步加热 释气特征 郯庐中段 深部地质 地球化学 

分 类 号：P593[天文地球—地球化学]