海洋地质前沿2025，Vol.41Issue(2)：53-67,15.DOI:10.16028/j.1009-2722.2024.038
马里亚纳海槽火山岩中斜长石熔体包裹体的均一温度及其对岩浆演化的指示意义
Homogeneous temperature of plagioclase melt inclusions in volcanic rocks from the Mariana Trough and its implication to magma evolution
摘要
Abstract
The crystallization temperatures of plagioclase melt inclusions in volcanic rocks from the Mariana Trough was studied.Results show that those in andesite(H5-T3-2)from the southern Mariana Trough are mainly in 1 050～1 150℃and did not affected by later magmatic evolution;those in basaltic andesite(H5-T1-3)from the central Mariana Trough are mainly 900～1 050℃;and those in dacite(H5-T1-1)are mainly 1 050～1 150℃.The homogenization temperatures of melt inclusions in basalt(H5-T2-2,H5-T2-3)plagioclase near 18°N in the Mari-ana Trough are mainly 1 050～1 150℃,showing a continuous cooling trend,and only a small part crystallizes at a lower temperature of 1 000～1 050℃,and the sudden drop in the An value at the edge of plagioclase phenocryst reflects a rapid cooling of the magma ejection.In addition,the homogenization temperature of the melt inclusions in basalt andesite(H5-T2-1)plagioclase showed the characteristics of"bimodal"pattern of 850～950℃and 1 050～1 150℃.The banding characteristics and the An value variation of plagioclase indicate that the plagio-clase experienced two distinct crystallization stages and magma mixing,and there might be a magma chamber in the shallow part of the Mariana Trough,where the magma chamber temperature is about 850～950℃.The mag-matic evolution process near 18°N in the Mariana Trough is complex,and different periods of magmatic evolu-tion may occur.关键词
马里亚纳海槽/斜长石/熔体包裹体/均一温度/岩浆演化Key words
Mariana Trough/plagioclase feldspar/melt inclusions/uniform temperature/magmatic evolution分类
海洋科学引用本文复制引用
张保辉,韩超,曾志刚,曾志斌,杨小双,王晓媛,齐海燕,殷学博,陈帅,陈祖兴..马里亚纳海槽火山岩中斜长石熔体包裹体的均一温度及其对岩浆演化的指示意义[J].海洋地质前沿,2025,41(2):53-67,15.基金项目
国家自然科学基金"深海界面过程和化能生态系统""冲绳海槽与马里亚纳海槽的热液烟囱体特征及其对流体演化的指示""西太平洋俯冲体系中岩浆活动及其对热液物质供给的制约"(42221005,42330409,91958213) （42221005,42330409,91958213）
中国科学院战略性先导科技专项子课题"热液/冷泉区岩浆物质贡献与流体化学过程"(XDB42020402) （XDB42020402）
国家重点基础研究发展计划(973计划)项目"典型弧后盆地热液活动及其成矿机理"(2013CB429700) （973计划）
泰山学者工程(ts201511061) （ts201511061）
