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dc.contributor.authorDick, HJB
dc.contributor.authorMacLeod, CJ
dc.contributor.authorBlum, P
dc.contributor.authorAbe, N
dc.contributor.authorBlackman, DK
dc.contributor.authorBowles, JA
dc.contributor.authorCheadle, MJ
dc.contributor.authorCho, K
dc.contributor.authorCiazela, J
dc.contributor.authorDeans, JR
dc.contributor.authorEdgcomb, VP
dc.contributor.authorFerrando, C
dc.contributor.authorFrance, L
dc.contributor.authorGhosh, B
dc.contributor.authorIldefonse, B
dc.contributor.authorJohn, B
dc.contributor.authorKendrick, MA
dc.contributor.authorKoepke, J
dc.contributor.authorLeong, JAM
dc.contributor.authorLiu, C
dc.contributor.authorMa, Q
dc.contributor.authorMorishita, T
dc.contributor.authorMorris, A
dc.contributor.authorNatland, JH
dc.contributor.authorNozaka, T
dc.contributor.authorPluemper, O
dc.contributor.authorSanfilippo, A
dc.contributor.authorSylvan, JB
dc.contributor.authorTivey, MA
dc.contributor.authorTribuzio, R
dc.contributor.authorViegas, G
dc.date.accessioned2024-03-22T11:44:58Z
dc.date.available2024-03-22T11:44:58Z
dc.date.issued2019-12
dc.identifier.issn2169-9313
dc.identifier.issn2169-9356
dc.identifier.urihttps://pearl.plymouth.ac.uk/handle/10026.1/22218
dc.description.abstract

809 deep IODP Hole U1473A at Atlantis Bank, SWIR, is 2.2 km from 1,508-m Hole 735B and 1.4 from 158-m Hole 1105A. With mapping, it provides the first 3-D view of the upper levels of a 660-km2 lower crustal batholith. It is laterally and vertically zoned, representing a complex interplay of cyclic intrusion, and ongoing deformation, with kilometer-scale upward and lateral migration of interstial melt. Transform wall dives over the gabbro-peridotite contact found only evolved gabbro intruded directly into the mantle near the transform. There was no high-level melt lens, rather the gabbros crystallized at depth, and then emplaced into the zone of diking by diapiric rise of a crystal mush followed by crystal-plastic deformation and faulting. The residues to mass balance the crust to a parent melt composition lie at depth below the center of the massif—likely near the crust-mantle boundary. Thus, basalts erupted to the seafloor from >1,550 mbsf. By contrast, the Mid-Atlantic Ridge lower crust drilled at 23°N and at Atlantis Massif experienced little high-temperature deformation and limited late-stage melt transport. They contain primitive cumulates and represent direct intrusion, storage, and crystallization of parental MORB in thinner crust below the dike-gabbro transition. The strong asymmetric spreading of the SWIR to the south was due to fault capture, with the northern rift valley wall faults cutoff by a detachment fault that extended across most of the zone of intrusion. This caused rapid migration of the plate boundary to the north, while the large majority of the lower crust to spread south unroofing Atlantis Bank and uplifting it into the rift mountains.

dc.format.extent12631-12659
dc.languageen
dc.publisherAmerican Geophysical Union (AGU)
dc.subject37 Earth Sciences
dc.subject3703 Geochemistry
dc.subject3705 Geology
dc.subject3706 Geophysics
dc.titleDynamic Accretion Beneath a Slow‐Spreading Ridge Segment: IODP Hole 1473A and the Atlantis Bank Oceanic Core Complex
dc.typejournal-article
dc.typeArticle
plymouth.issue12
plymouth.volume124
plymouth.publisher-urlhttp://dx.doi.org/10.1029/2018jb016858
plymouth.publication-statusPublished
plymouth.journalJournal of Geophysical Research: Solid Earth
dc.identifier.doi10.1029/2018jb016858
plymouth.organisational-group|Plymouth
plymouth.organisational-group|Plymouth|Research Groups
plymouth.organisational-group|Plymouth|Faculty of Science and Engineering
plymouth.organisational-group|Plymouth|Faculty of Science and Engineering|School of Geography, Earth and Environmental Sciences
plymouth.organisational-group|Plymouth|Research Groups|Marine Institute
plymouth.organisational-group|Plymouth|REF 2021 Researchers by UoA
plymouth.organisational-group|Plymouth|Users by role
plymouth.organisational-group|Plymouth|Users by role|Current Academic staff
plymouth.organisational-group|Plymouth|REF 2021 Researchers by UoA|UoA07 Earth Systems and Environmental Sciences
plymouth.organisational-group|Plymouth|Users by role|Researchers in ResearchFish submission
plymouth.organisational-group|Plymouth|REF 2029 Researchers by UoA
plymouth.organisational-group|Plymouth|REF 2029 Researchers by UoA|UoA07 Earth Systems and Environmental Sciences
dcterms.dateAccepted2019-10-28
dc.date.updated2024-03-22T11:44:57Z
dc.rights.embargodate2024-3-23
dc.identifier.eissn2169-9356
rioxxterms.versionofrecord10.1029/2018jb016858


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