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SUMMARY:High-P\,T diffraction studies of dehydration of magnesium silicate
 s related to the deep Earth’s water cycle
DTSTART;VALUE=DATE-TIME:20200714T105000Z
DTEND;VALUE=DATE-TIME:20200714T111000Z
DTSTAMP;VALUE=DATE-TIME:20260417T084212Z
UID:indico-contribution-1043@indico.inp.nsk.su
DESCRIPTION:Speakers: Anna Likhacheva (Sobolev Institute of Geology and Mi
 neralogy SibD RAS)\nIn the context of the global H2O cycle\, an active int
 erest is taken in water recycling associated with subduction of oceanic pl
 ates into the mantle. Mineral serpentine\, Mg3Si2O5(OH)4\, is regarded as 
 the main water reservoir in oceanic litosphere [1]\, and therefore its deh
 ydration can produce a large impact onto seismic activity and magma genera
 tion in subduction zones. Since the dehydration temperature can be effecti
 vely decreased in the presence of alkali chlorides [2]\, we explore this e
 ffect on serpentine dehydration. Here we report the results of in-situ X-r
 ay diffraction and Raman spectroscopy studies of two serpentine minerals\,
  chrysotile and antigorite\, in the presence of sodium chloride at high P-
 T conditions relevant to subduction zone (1-4 GPa\, 400-800oC). The dehydr
 ation temperature of both minerals is about 200 degrees lower compared to 
 salt-free H2O-saturated conditions\, which is important for the localizati
 on of dehydration reactions in subducting slab. This work is supported by 
 the Russian Foundation for Basic Research (grant No 18-05-00312). Diffract
 ion experiments were performed at SSTRC\, Novosibirsk (project RFMEFI62119
 X0022) and the PETRA III (DESY\, Hamburg)\, and supported by approval of P
 ETRA III Proposal I-20190140.\n\nhttps://indico.inp.nsk.su/event/24/contri
 butions/1043/
LOCATION: Zoom 890 9721 5207
URL:https://indico.inp.nsk.su/event/24/contributions/1043/
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