Abstract It is commonly assumed that intermediate-depth seismicity in some way linked to dehydration reactions inside subducting oceanic plates. Although there growing evidence the hydration state of an plate controlled by its structure and degree faulting, we do not have a quantitative understanding this relationship. Double seismic zones offer possibility investigating changes oceanic-plate o...

The search for a fossil record of Earth's deep biosphere, partly motivated by potential analogies with subsurface habitats on Mars, has uncovered numerous assemblages inorganic microfilaments and tubules inside ancient pores fractures. Although these enigmatic objects are morphologically similar to mineralized microorganisms (and some contain organic carbon), they also resemble abiotic structur...