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Magmatic processes in developing oceanic crust revealed in a cumulate xenolith collected at the East Pacific Rise, 9°50′N
Authors
Allan
Arai
+82 more
Batiza
Bender
Borisov
Bottinga
Boudier
Bédard
Bédard
Bédard
Bédard
Clynne
Coogan
Coogan
Coogan
Coogan
Coogan
Costa
Crawford
Crawford
Daniel J. Fornari
Danyushevsky
Danyushevsky
Danyushevsky
Davis
Detrick
Detrick
Dick
Dixon
Dunn
Elthon
Elthon
Falloon
Ford
Fornari
Garmany
Gregg
Grove
Gurenko
Hekinian
Hussenoeder
Irvine
Jagoutz
Johannes
Karson
Kelemen
Kent
Kent
Kinzler
Kinzler
Koga
Korenaga
Korenaga
Lange
Langmuir
Le Maitre
Lundstrom
Macleod
Macleod
Marsh
Marsh
Matthew C. Smith
McDonough
Michael R. Perfit
Natland
Natland
Nicolas
Nicolas
Nielsen
Pan
Perfit
Perfit
Perfit
Ridley
Rubin
Saal
Schouten
Singh
Sinton
Sinton
Smith
Smith
Van Orman
W. Ian Ridley
Publication date
12 December 2006
Publisher
'American Geophysical Union (AGU)'
Doi
Cite
Abstract
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 7 (2006): Q12O04, doi:10.1029/2006GC001316.The petrology and geochemistry of a xenolith, a fragment of a melt-bearing cumulate, within a recently erupted mid-ocean ridge (MOR) lava flow provide information on petrogenetic processes occurring within the newly forming oceanic crust beneath the northern East Pacific Rise (NEPR). The xenolith reveals important petrologic information about MOR magmatic systems concerning (1) melt distribution in a crystal-dominated mush; (2) melt-crystal reactions within the mush; (3) the chemistry of melts that have contributed to the cumulate lithology; and (4) the chemistry of axial melts that enter the axial magma system. The xenolith was enclosed within a moderately primitive, normal mid-ocean ridge basalt (NMORB) erupted in 1991 within the neovolcanic zone of the NEPR, at approximately 9°50′N. The sample is a matrix-dominated, cumulate olivine anorthosite, composed of anorthite (An94-90) and bytownite (An89-70), intergranular olivine (Fo86±0.3), minor sulfide and spinel, and intergranular glass. Marginal corrosion of plagioclase, and possibly olivine, and internal remelting of plagioclase indicate syntexis. It is surmised that the pore volume was eviscerated several times with moderately primitive basaltic melts and reduced by intergranular crystallization of forsteritic olivine. The presence of anorthite as a cumulate phase in the xenolith and the observation of anorthite xenocrysts in NMORB lavas, and as a cumulate phase in ophiolite gabbros, indicate that Ca-rich melts that are not a part of the NMORB lineage play an important role in the construction of the oceanic crust.The Mineral Resources Program, USGS, provided support to W.I.R. for this research. Field and laboratory research was supported by NSF grants OCE-9402360, 9403773, and 0138088 to M.R.P. and NSF grants OCE-9819261 and OCE-0525863 to D.J.F
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