atmospheric gas
; concentration (composition)
; dehydration
; halogen
; island
; lithosphere
; magmatism
; mantle
; mid-ocean ridge
; oceanic crust
; seawater
; serpentinite
; subduction
; trace element
; water
; xenon
英文摘要:
The extent to which water and halogens in Earth's mantle have primordial origins, or are dominated by seawater-derived components introduced by subduction is debated. About 90% of non-radiogenic xenon in the Earth's mantle has a subducted atmospheric origin, but the degree to which atmospheric gases and other seawater components are coupled during subduction is unclear. Here we present the concentrations of water and halogens in samples of magmatic glasses collected from mid-ocean ridges and ocean islands globally. We show that water and halogen enrichment is unexpectedly associated with trace element signatures characteristic of dehydrated oceanic crust, and that the most incompatible halogens have relatively uniform abundance ratios that are different from primitive mantle values. Taken together, these results imply that Earth's mantle is highly processed and that most of its water and halogens were introduced by the subduction of serpentinized lithospheric mantle associated with dehydrated oceanic crust.
Research School of Earth Sciences, Australian National University, 142 Mills Road ActonACT, Australia; Laboratoire Géosciences Océan, IUEM-UBO, Avenue Dumont d'Urville, Plouzané, France; CODES and Earth Sciences, University of Tasmania, Tasmania, Australia; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, Germany; Central Science Laboratory, University of Tasmania, Tasmania, Australia; University of California Santa Barbara, Department of Earth Science, Santa Barbara, CA, United States; Department of Geological Sciences, University of Florida, Gainesville, FL, United States
Recommended Citation:
Kendrick M.A.,Hémond C.,Kamenetsky V.S.,et al. Seawater cycled throughout Earth's mantle in partially serpentinized lithosphere[J]. Nature Geoscience,2017-01-01,10(3)