Nanostructure of serpentinisation products: Importance for water transport and low-temperature alteration
نویسندگان
چکیده
The hydration of mantle rocks occurs at mid-ocean ridges, in subduction zones and ophiolites where it strongly modifies the properties oceanic lithosphere. nanostructure reaction products is poorly constrained, but very important, as controls fluid transport during solid volume increase, influences phase reactivity further fluid/rock interaction low temperature. We image contacts between olivine its nanoscale, a dunite collected Oman Drilling Project that underwent nearly isochemical serpentinisation increase. Olivine first reacts to form ?100 nm thick coating composed brucite/serpentine mixture, suggesting this scale too. Lizardite columns ?1 ?m wide replace mixture margin. are embedded brucite-rich assemblage containing high density nanopores may favour reaction. interpret these observations nanometre-scale, two-step process. Fluid pathways formed rather than clogged by thanks mass transfer limited less 100 nm. preservation increase explains observed extents presence brucite porosity regions explain preferential temperature interaction.
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2021
ISSN: ['1385-013X', '0012-821X']
DOI: https://doi.org/10.1016/j.epsl.2021.117212