Depth-dependent Variations in Elemental and Mineral Distribution in the Deep Oceanic Floor Sediments (WP21GPC04) near the Mariana Trench in the Western Pacific Ocean
Junte Heo, Seohee Yun, Jonguk Kim, Young Tak Ko, Yongjae Lee
{"title":"Depth-dependent Variations in Elemental and Mineral Distribution in the Deep Oceanic Floor Sediments (WP21GPC04) near the Mariana Trench in the Western Pacific Ocean","authors":"Junte Heo, Seohee Yun, Jonguk Kim, Young Tak Ko, Yongjae Lee","doi":"10.9719/eeg.2023.56.5.581","DOIUrl":null,"url":null,"abstract":"This study reports depth-dependent elemental distribution and mineral abundance of the oceanic sediment sample (WP21GPC04) near the Mariana Trench collected during the WP21 expedition in 2021. The elemental distribution determined by μ-XRF shows no significant differences with varying depth, with an average SiO 2 53.91 wt%, FeO 4.48 wt%, Al 2 O 3 16.56 wt%, MgO 2.56 wt%, CaO 4.79 wt%, Na 2 O 3.52 wt%, K 2 O 5.48 wt%, similar to the average chemical composition of global subducting sediments (GLOSS). The mineral abundances analyzed using synchrotron XRD, however, vary with depth. While quartz, mica, and plagioclase were identified at all depths, chlorite was found at shallow depths, and zeolite group minerals, phillipsite and heulandite, showed a gradual change in phase fraction with depth. This suggests a change in sedimentation and alteration environments in the region, or the potential for coexistence emerges due to similar sediment stability. Overall, this study will provide a basis for the future investigations on the evolution of sedimentary environment near the Mariana Trench in the western Pacific Ocean and the phase distribution and the behavior of subducting oceanic sediments, which will affect the lithological and geochemical characteristics of the Mariana susduction system.","PeriodicalId":44811,"journal":{"name":"Economic and Environmental Geology","volume":null,"pages":null},"PeriodicalIF":0.4000,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Economic and Environmental Geology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.9719/eeg.2023.56.5.581","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
This study reports depth-dependent elemental distribution and mineral abundance of the oceanic sediment sample (WP21GPC04) near the Mariana Trench collected during the WP21 expedition in 2021. The elemental distribution determined by μ-XRF shows no significant differences with varying depth, with an average SiO 2 53.91 wt%, FeO 4.48 wt%, Al 2 O 3 16.56 wt%, MgO 2.56 wt%, CaO 4.79 wt%, Na 2 O 3.52 wt%, K 2 O 5.48 wt%, similar to the average chemical composition of global subducting sediments (GLOSS). The mineral abundances analyzed using synchrotron XRD, however, vary with depth. While quartz, mica, and plagioclase were identified at all depths, chlorite was found at shallow depths, and zeolite group minerals, phillipsite and heulandite, showed a gradual change in phase fraction with depth. This suggests a change in sedimentation and alteration environments in the region, or the potential for coexistence emerges due to similar sediment stability. Overall, this study will provide a basis for the future investigations on the evolution of sedimentary environment near the Mariana Trench in the western Pacific Ocean and the phase distribution and the behavior of subducting oceanic sediments, which will affect the lithological and geochemical characteristics of the Mariana susduction system.
期刊介绍:
The Economic and Environmental Geology (Econ. Environ. Geol.) is the official journal of the Korean Society of Economic and Environmental Geology. The prime focus of the journal will remain on high-impact original research and reviews in the fields of ore deposits, economic and environmental geology of the solid Earth at all scales. To better represent the changes we face today, Econ. Environ. Geol. particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, hydrogeological, mineralogical, and applied geological approaches. Within this space, we are particularly keen to advance roles of Econ. Environ. Geol. in delivering scientific solutions to the pressing issues of our time, namely in reducing our vulnerability to the ''solid-earth'' natural hazards and in resource development applications. With growing demand for access to Earth''s resources and urgent needs to seek new solutions for dealing with harmful waste, we have enormous benefits to be gained from better a understanding of the physics of this extraordinary dynamic planet.