The Indication of Ca/Al for Plagioclase-hosted Melt Inclusions from MORB:A Case Study in South Mid-Ocean Ridge 19°S
ZHANG Hai-tao1, YANG Yao-min1,2, SHI Xue-fa1, YAN Quan-shu1, ZHU Zhi-wei1
1. First Institute of Oceanography(FIO) State Oceanic Administration(SOA), Key Laboratory of Marine Sedimentology and Environ-mental Geology(MASEG), Qingdao Shandong 266061, China; 2. National Deep Sea Center, Qingdao Shandong 266061, China
Abstract：Ca/Al ratio has direct indicating significance for the plagioclase-hosted melt inclusions research. Aim to further study the forming mechanism of plagioclase-hosted melt inclusions, this thesis has a research on plagioclase-hosted melt inclusions from South Mid-Atlantic ridge 19°MORB. Combining with the data of plagioclase-hosted melt inclusions in global petrological database(PetDB), we discuss the variation characteristic of Ca/Al during the formation and modification processesof plagioclase-hosted melt inclusions. The results indicate that:(1) Ca/Al ratio has a direct potential to assess the chemical fractionation, post-entrapment crystallization and diffusion processes;(2) The melt inclusions with Ca/Al>0.85(or 0.80) could not represent the primary or evaluation anhydrous MORB magma;(3) The composition of plagioclase-hosted melt inclusions in SMAR19°with Ca/Al>1.0 could not represent the composition of melt at the time of inclusion trapping.
张海桃, 杨耀民, 石学法, 鄢全树, 朱志伟. Ca/Al值对MORB斜长石熔体包裹体研究的指示意义——以南大西洋中脊19°S为例[J]. J4, 2016, 35(2): 387-397.
ZHANG Hai-tao, YANG Yao-min, SHI Xue-fa, YAN Quan-shu, ZHU Zhi-wei. The Indication of Ca/Al for Plagioclase-hosted Melt Inclusions from MORB:A Case Study in South Mid-Ocean Ridge 19°S. J4, 2016, 35(2): 387-397.
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