海洋地质与第四纪地质2024，Vol.44Issue(4)：99-107,中插1-中插3,12.DOI:10.16562/j.cnki.0256-1492.2021121501
西南印度洋中脊东段MORB微量元素地球化学及其对地幔源区组成的指示
MORB trace element geochemistry in the eastern of southwest indian ridge and its indication for the composition of mantle source
摘要
Abstract
The eastern of the southwest Indian ridge(E-SWIR)is located between 61°and 70°E,with relatively low melt supply.Most of the mid-ocean ridge basalts(MORB)produced in this area is a typical E-MORB with the characteristics of enrichment of incompatible elements and large ion lithophile elements.Based on the trace element geochemical data of basalt samples,the analysis of La/Sm,Zr/Nb and Lu/Tb shows that the E-SWIR mantle has obvious heterogeneity,which may be related to the axial variation of pyroxenite content in the mantle.Using the contents of rare earth elements Ce,Sm,Lu and Yb in combination with the simulation results of partial melting calculation,the role and influence of garnet in the mantle source area are further clarified,and it is believed that it may exist in the mantle as auriferous garnet pyroxene.The identification of the nature and occurrence form of eclogites in the E-SWIR mantle source region is the key to discuss the origin of E-MORB,mantle heterogeneity and the tectonic evolution of mid ocean ridge.关键词
元素地球化学/地幔源区组成/洋中脊玄武岩/西南印度洋中脊东段Key words
elemental geochemistry/composition of mantle source/MORB/eastern of southwest Indian Ridge分类
海洋科学引用本文复制引用
董振,梁锦,曹志敏,贺惠忠,陈亮,陆茸..西南印度洋中脊东段MORB微量元素地球化学及其对地幔源区组成的指示[J].海洋地质与第四纪地质,2024,44(4):99-107,中插1-中插3,12.基金项目
广东省广州市2024年度基础与应用基础研究专题:青年博士"启航"项目"超慢速扩张西南印度洋中脊斜长石超斑玄武岩成因机制研究"(SL2023A04J01654) （SL2023A04J01654）
