@article {Wanless2011,
	title = {{Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers}},
	journal = {Chemical Geology},
	volume = {287},
	number = {1-2},
	year = {2011},
	pages = {54{\textendash}65},
	abstract = {Most geochemical variability in MOR basalts is consistent with low- to moderate-pressure fractional crystallization of various mantle-derived parental melts. However, our geochemical data from MOR high-silica glasses, including new volatile and oxygen isotope data, suggest that assimilation of altered crustal material plays a significant role in the petrogenesis of dacites and may be important in the formation of basaltic lavas at MOR in general. MOR high-silica andesites and dacites from diverse areas show remarkably similar major element trends, incompatible trace element enrichments, and isotopic signatures suggesting similar processes control their chemistry. In particular, very high Cl and elevated H2O concentrations and relatively light oxygen isotope ratios ({\~{}}~5.8{\textperthousand} vs. expected values of {\~{}}~6.8{\textperthousand}) in fresh dacite glasses can be explained by contamination of magmas from a component of ocean crust altered by hydrothermal fluids. Crystallization of silicate phases and Fe-oxides causes an increase in $δ$18O in residual magma, but assimilation of material initially altered at high temperatures results in lower $δ$18O values. The observed geochemical signatures can be explained by extreme fractional crystallization of a MOR basalt parent combined with partial melting and assimilation (AFC) of amphibole-bearing altered oceanic crust. The MOR dacitic lavas do not appear to be simply the extrusive equivalent of oceanic plagiogranites. The combination of partial melting and assimilation produces a distinct geochemical signature that includes higher incompatible trace element abundances and distinct trace element ratios relative to those observed in plagiogranites.},
	keywords = {ROV DSL-120 (Remotely Operated Vehicle), ROV Jason (Remotely Operated Vehicle)},
	issn = {0009-2541},
	doi = {10.1016/j.chemgeo.2011.05.017},
	url = {http://dx.doi.org/10.1016/j.chemgeo.2011.05.017},
	author = {Wanless, V D and Perfit, M R and Ridley, W I and Wallace, P J and Grimes, C B and Klein, E M}
}
@article {Goss2010,
	title = {{Geochemistry of lavas from the 2005-2006 eruption at the East Pacific Rise, 9 degrees 46{\textquoteright}N-9 degrees 56{\textquoteright}N: Implications for ridge crest plumbing and decadal changes in magma chamber compositions}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {11},
	year = {2010},
	pages = {Q05T09},
	abstract = {Detailed mapping, sampling, and geochemical analyses of lava flows erupted from an \~{}18 km long section of the northern East Pacific Rise (EPR) from 9{\textdegree}46'N to 9{\textdegree}56'N during 2005{\textendash}2006 provide unique data pertaining to the short-term thermochemical changes in a mid-ocean ridge magmatic system. The 2005{\textendash}2006 lavas are typical normal mid-oceanic ridge basalt with strongly depleted incompatible trace element patterns with marked negative Sr and Eu/Eu* anomalies and are slightly more evolved than lavas erupted in 1991{\textendash}1992 at the same location on the EPR. Spatial geochemical differences show that lavas from the northern and southern limits of the 2005{\textendash}2006 eruption are more evolved than those erupted in the central portion of the fissure system. Similar spatial patterns observed in 1991{\textendash}1992 lavas suggest geochemical gradients are preserved over decadal time scales. Products of northern axial and off-axis fissure eruptions are consistent with the eruption of cooler, more fractionated lavas that also record a parental melt component not observed in the main suite of 2005{\textendash}2006 lavas. Radiogenic isotopic ratios for 2005{\textendash}2006 lavas fall within larger isotopic fields defined for young axial lavas from 9{\textdegree}N to 10{\textdegree}N EPR, including those from the 1991{\textendash}1992 eruption. Geochemical data from the 2005{\textendash}2006 eruption are consistent with an invariable mantle source over the spatial extent of the eruption and petrogenetic processes (e.g., fractional crystallization and magma mixing) operating within the crystal mush zone and axial magma chamber (AMC) before and during the 13 year repose period. Geochemical modeling suggests that the 2005{\textendash}2006 lavas represent differentiated residual liquids from the 1991{\textendash}1992 eruption that were modified by melts added from deeper within the crust and that the eruption was not initiated by the injection of hotter, more primitive basalt directly into the AMC. Rather, the eruption was driven by AMC pressurization from persistent or episodic addition of more evolved magma from the crystal mush zone into the overlying subridge AMC during the period between the two eruptions. Heat balance calculations of a hydrothermally cooled AMC support this model and show that continual addition of melt from the mush zone was required to maintain a sizable AMC over this time interval.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {1525-2027},
	doi = {10.1029/2009GC002977},
	url = {http://dx.doi.org/10.1029/2009GC002977},
	author = {Goss, A R and Perfit, M R and Ridley, W I and Rubin, K H and Kamenov, G D and Soule, S A and Fundis, A and Fornari, D J}
}
@article {Soule2005,
	title = {{Channelized lava flows at the East Pacific Rise crest 9 degrees-10 degrees N: The importance of off-axis lava transport in developing the architecture of young oceanic crust}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {6},
	year = {2005},
	pages = {Q08005},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV DSL-120 (Remotely Operated Vehicle)},
	issn = {1525-2027},
	doi = {10.1029/2005gc000912},
	url = {http://dx.doi.org/10.1029/2005gc000912},
	author = {Soule, S A and Fornari, D J and Perfit, M R and Tivey, M A and Ridley, W I and Schouten, H}
}
@article {Perfit2003,
	title = {{Interaction of sea water and lava during submarine eruptions at mid-ocean ridges}},
	journal = {Nature},
	volume = {426},
	number = {6962},
	year = {2003},
	pages = {62{\textendash}64},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0028-0836},
	doi = {10.1038/nature02032},
	url = {http://dx.doi.org/10.1038/nature02032},
	author = {Perfit, M R and Cann, J R and Fornari, D J and Engels, J and Smith, D K and Ridley, W I and Edwards, M H}
}
@article {Smith2001b,
	title = {{Magmatic processes and segmentation at a fast spreading mid-ocean ridge: Detailed investigation of an axial discontinuity on the East Pacific Rise crest at 9 degrees 37{\textquoteright} N}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {2},
	number = {10},
	year = {2001},
	pages = {2000GC000134},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {1525-2027},
	doi = {10.1029/2000GC000134},
	url = {http://dx.doi.org/10.1029/2000GC000134},
	author = {Smith, M C and Perfit, M R and Fornari, D J and Ridley, W I and Edwards, M H and Kurras, G J and Von Damm, K L}
}
@article {Gregg2000,
	title = {{Using submarine lava pillars to record mid-ocean ridge eruption dynamics}},
	journal = {Earth and Planetary Science Letters},
	volume = {178},
	number = {3-4},
	year = {2000},
	pages = {195{\textendash}214},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0012-821X},
	doi = {10.1016/S0012-821X(00)00085-6},
	url = {http://dx.doi.org/10.1016/S0012-821X(00)00085-6},
	author = {Gregg, T K P and Fornari, D J and Perfit, M R and Ridley, W I and Kurz, M D}
}
@article {Ridley1994,
	title = {{Hydrothermal alteration in oceanic ridge volcanics: A detailed study at the Galapagos fossil hydrothermal field}},
	journal = {Geochimica et Cosmochimica Acta},
	volume = {58},
	number = {11},
	year = {1994},
	pages = {2477{\textendash}2494},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0016-7037},
	doi = {10.1016/0016-7037(94)90025-6},
	url = {http://dx.doi.org/10.1016/0016-7037(94)90025-6},
	author = {Ridley, W I and Perfit, M R and Jonasson, I R and Smith, M F}
}
