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   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    Water storage capacity in oceanic crust slabs increases with age,   
   researchers find    
      
     Date:   
         July 3, 2023   
     Source:   
         Tohoku University   
     Summary:   
         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. The more mature the   
         subduction zone, the bigger the water storage capacity.   
      
      
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   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 Geologyon 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 Herna'ndez 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.   
      
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   Source: Materials provided by Tohoku_University. Note: Content may be   
   edited for style and length.   
      
      
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   Journal Reference:   
      1. David Herna'ndez-Uribe, Tatsuki Tsujimori. Progressive lawsonite   
         eclogitization of the oceanic crust: Implications for deep mass   
         transfer in subduction zones. Geology, 2023; 51 (7): 678 DOI:   
         10.1130/G51052.1   
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   Link to news story:   
   https://www.sciencedaily.com/releases/2023/07/230703133026.htm   
      
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