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Seismic reflection images of the Moho underlying melt sills at the East Pacific Rise | | S C Singh
; A J Harding
; G M Kent
; M C Sinha
; V Combier
; S Bazin
; C H Tong
; J W Pye
; P J Barton
; R W Hobbs
; R S White
; J A Orcutt
; | | Date: |
20 Jul 2006 | | Journal: | Nature, 442 (7100), 287-90 | | Abstract: | The determination of melt distribution in the crust and the nature of the crust-mantle boundary (the ’Moho’) is fundamental to the understanding of crustal accretion processes at oceanic spreading centres. Upper-crustal magma chambers have been imaged beneath fast- and intermediate-spreading centres but it has been difficult to image structures beneath these magma sills. Using three-dimensional seismic reflection images, here we report the presence of Moho reflections beneath a crustal magma chamber at the 9 degrees 03’ N overlapping spreading centre, East Pacific Rise. Our observations highlight the formation of the Moho at zero-aged crust. Over a distance of less than 7 km along the ridge crest, a rapid increase in two-way travel time of seismic waves between the magma chamber and Moho reflections is observed, which we suggest is due to a melt anomaly in the lower crust. The amplitude versus offset variation of reflections from the magma chamber shows a coincident region of higher melt fraction overlying this anomalous region, supporting the conclusion of additional melt at depth. | | Source: | PubMed, pmid16855587 doi: 10.1038/nature04939 | | Services: | Forum | Review | Favorites | |
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