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International Affairs Students Current Students Alumni Faculty/Staff Careers--> TOHOKU UNIVERSITYCREATING GLOBAL EXCELLENCE Search 日本語 Contact Tohoku University --> About Facts & Figures Facilities Organization Chart History President's Message Top Global University Project Designated National University Global Network Promotional Videos Academics Undergraduate Graduate Courses in English Exchange Programs Summer Programs Double Degree Programs Academic Calendar Syllabus Admissions Undergraduate Admissions Graduate Admissions Fees and Expenses Financial Aid Research Feature Highlights Research Releases University Research News Research Institutes Visitor Research Center Research Profiles Academic Research Staff Campus Life International Support Office IT Services Facilities Dining & Shops Campus Bus Clubs & Circles News University News Research--> Arts & Culture Health & Sports Campus & Community Press Release--> International Visit Alumni Careers Events Exhibits Music Special Event Lecture Alumni--> Map & Directions Campus Maps & Bus--> Facilities Map--> TOHOKUUNIVERSITY About Academics Admissions Research Campus Life News Events International Affairs Students Current Students Alumni Faculty/Staff Promotional Videos Subscribe to our Newsletter Map & Directions Contact Jobs & Vacancies Emergency Information Site Map 日本語 Close Home Research News Water Storage Capacity in Oceanic Crust Slabs Increases with Age, Researchers Find Research News Water Storage Capacity in Oceanic Crust Slabs Increases with Age, Researchers Find 2023-07-03 An international research team has discovered that a subduction zone's age affects the ability for it to recycle water between the Earth's surface and its inner layers. Details of their findings were reported in the journal Geology on July 1, 2023. When two tectonic plates collide and one subducts beneath the other, various rocks get subjected to changes in pressure, temperatures and chemical environments and undergo metamorphosis. This process is important for recycling water and critical elements, such as strontium, uranium, thorium, and lead, between the Earth's surface and its deep interior. One such rock that forms at high pressure is lawsonite eclogites. Lawsonite eclogites, play a crucial role in storing water in subducting plates since they contain the mineral lawsonite, which can carry large quantities of H2O to the deeper mantle. Scientists have traditionally thought that oceanic crust turns into lawsonite eclogites in cold subduction zones. This is based on models and experiments that point to lawsonite being a common mineral in cold geothermal regimes. Yet, the opposite is the case. Lawsonite is not commonly found in fossilized subduction zones on the Earth's surface, providing further questions regarding our current understanding of how water is stored in subductions zones. To investigate this puzzle, a team lead by Dr. David Hernández Uribe and Professor Tatsuki Tsujimori from the Department of Earth and Environmental Sciences at the University of Illinois Chicago and the Center for Northeast Asian Studies at Tohoku University, respectively, used state-of-the-art modeling techniques to simulate rock formation at different lifetime stages of a subduction zone. Petrological modeling and phase equilibrium calculations performed by the group revealed that, in a subduction zone's early stages (< 6 million years), oceanic crust does not turn into lawsonite eclogites. But over time, (12-33 millions years) it does. "We found that the formation of lawsonite eclogites depends on how mature the subduction zone is," says Tsujimori. "Lawsonite is important for recycling water deep beneath the Earth's surface only in mature subduction zones. In younger zones, it doesn't play as big of a role as previously thought." The finding will aid scientists in the understanding of water and mass recycling in tectonic settings. Tectonic plates subducting early in its subduction zone history will not carry as much H2O as plates subducting in mature stages of the subduction zone's lifetime. Field-view of a rare lawsonite eclogite in Guatemala. This distinctive variety of eclogite demonstrates exceptional water storage capabilities attributed to the presence of lawsonite, a hydrated calcium-aluminum sorosilicate mineral with the chemical formula CaAl2(Si2O7) (OH)2·H2O. ©Tatsuki Tsujimori Publication Details: Title: Progressive lawsonite eclogitization of the oceanic crust: Implications for deep mass transfer in subduction zonesAuthors: David Hernández-Uribe, Tatsuki TsujimoriJournal: GeologyDOI: 10.1130/G51052.1 Press release in Japanese Contact: Tatsuki TsujimoriEmail: tatsukixtohoku.ac.jpWebsite: https://tatsukix.netlify.com Archives 2014&＃24180; 2015&＃24180; 2016&＃24180; 2017&＃24180; 2018&＃24180; 2019&＃24180; 2020&＃24180; 2021&＃24180; 2022&＃24180; 2023&＃24180; Page Top About Tohoku University Academics Admissions Research Campus Life News Events International Affairs Students Alumni Promotional Videos Subscribe to our Newsletter Map & Directions Contact Tohoku University Jobs & Vacancies Emergency Information Site Map Media Enquiries Parent & Family Support Public Facilities Contact Tohoku University