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Magmatic processes under mid-ocean ridges: A detailed mineralogic study of lavas from East Pacific Rise 9 degrees 30 ' N, 10 degrees 30 ' N, and 11 degrees 20 ' N
Pan, YC; Batiza, R
2003-11-01
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume4
SubtypeReview
Abstract[1] Detailed petrologic study has been made for lavas from the northern East Pacific Rise (EPR) 9degrees30'N, 11degrees20'N, and 10degrees30'N. 9degrees30'N and 11degrees20'N have robust magma supply and a shallow melt lens while 10degrees30'N has nonrobust magma supply and no shallow melt lens. Lavas from all three localities are sparsely phyric and glassy, containing plagioclase +/- olivine +/- pyroxene. Typically, the lavas contain several to many ( up to seven) distinct chemical groups of plagioclase that are not always distinct texturally. The lavas may also contain up to three chemically distinct groups of olivine and two groups of pyroxene. The lavas contain both individual crystals and groups comprising reticulate and dendritic clots that we interpret to represent bits of crystal networks forming in mushy zones of an axial magma chamber. 21 of the 23 samples studied in detail have diverse crystal compositions and require mixing, which most likely occurs when mostly liquid magma passes through mushy zones. We find no significant systematic differences between robust and nonrobust segments in terms of their crystal content, proportion of texturally distinct xenocrysts, crystal size, aspect ratio, roundness, modal abundance, magma residence time, number of diverse mineral-chemical groups, and characteristics of mixing like the total range of composition of disequilibrium minerals present, and the magnitude of the chemical gaps between disequilibrium and equilibrium compositions. This unexpected and remarkable similarity suggests that the presence or absence of a seismically imaged shallow melt lens has essentially no effect on the mineralogy of erupted lavas. We conclude that the fundamentally important magmatic process under mid-ocean ridges, from slow to fast, is the formation of crystal networks and their subsequent compaction; the seismically detected shallow melt lenses likely contain highly evolved magma, formed by expelled interstitial melt during crystal network compaction, and play very little role in crustal accretion. Our conclusion implies that the thick (> 3 km) low velocity zone near the base of the crust produces the thin (< 30 m) shallow melt lenses, not the other way around.
KeywordMid-ocean Ridge Magma Chamber East Pacific Rise Crystal Network Shallow Melt Lens Segregation Vein Marine Geology And Geophysics : Midocean Ridge Processes Seismology : Oceanic Crust TectonoPhysics : Physics Of Magma And Magma Bodies Volcanology : Physics And Chemistry Of Magma Bodies
DOI10.1029/2002GC000309
Indexed BySCI
Language英语
WOS IDWOS:000186394400001
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Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/33001
Collection海洋地质与环境重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Univ Hawaii, Dept Geol & Geophys, Honolulu, HI 96822 USA
3.Natl Sci Fdn, Arlington, VA 22230 USA
Recommended Citation
GB/T 7714
Pan, YC,Batiza, R. Magmatic processes under mid-ocean ridges: A detailed mineralogic study of lavas from East Pacific Rise 9 degrees 30 ' N, 10 degrees 30 ' N, and 11 degrees 20 ' N[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2003,4.
APA Pan, YC,&Batiza, R.(2003).Magmatic processes under mid-ocean ridges: A detailed mineralogic study of lavas from East Pacific Rise 9 degrees 30 ' N, 10 degrees 30 ' N, and 11 degrees 20 ' N.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,4.
MLA Pan, YC,et al."Magmatic processes under mid-ocean ridges: A detailed mineralogic study of lavas from East Pacific Rise 9 degrees 30 ' N, 10 degrees 30 ' N, and 11 degrees 20 ' N".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 4(2003).
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