Molybdenum isotope composition of the upper mantle and its origin:insight from mid-ocean ridge basalt  

作　　者：Shuo CHEN 

机构地区：[1]Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China

出　　处：《Journal of Oceanology and Limnology》2024年第3期705-708,共4页海洋湖沼学报（英文）

基　　金：the National Natural Science Foundation of China(Nos.42176087,42322605);the Laoshan Laboratory(No.LSKJ202204100);the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.2021206)。

摘　　要：The molybdenum(Mo)isotope system is pivotal in reconstructing marine redox changes throughout Earth’s history and has emerged as a promising tracer for igneous and metamorphic processes.Understanding its composition and variation across major geochemical reservoirs is essential for its application in investigating high-temperature processes.However,there is debate regarding theδ^(98/95)Mo value of the Earth’s mantle,with estimates ranging from sub-chondritic to super-chondritic values.Recent analyses of global mid-ocean ridge basalt(MORB)glasses revealed significantδ^(98/95)Mo variations attributed to mantle heterogeneity,proposing a two-component mixing model to explain the observed variation.Complementary studies confirmed the sub-chondriticδ^(98/95)Mo of the depleted upper mantle,suggesting remixing of subduction-modified oceanic crust as a plausible mechanism.These findings underscore the role of Mo isotopes as effective tracers for understanding dynamic processes associated with mantle-crustal recycling.

关 键 词：molybdenum(Mo)isotope MANTLE crustal recycling mid-ocean ridge basalt(MORB) 

分 类 号：P597[天文地球—地球化学] P736.2[天文地球—地质学]