FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2107316430> ?p ?o ?g. }

• W2107316430 endingPage "216" @default.
• W2107316430 startingPage "197" @default.
• W2107316430 abstract "Geophysical evidence precludes the existence of a large, mainly molten magma chamber beneath portions of the East Pacific Rise (EPR). A reasonable model, consistent with these data, involves a thin (tens to hundreds of meters high), narrow (<1–2 km wide) melt lens overlying a zone of crystal mush that is in turn surrounded by a transition zone of mostly solidified crust with isolated pockets of magma. Evidence from the superfast spreading portion of the EPR suggests that the composition of the melt lens is mainly moderately fractionated ferrobasalt. These results have important implications for magmatic processes occurring beneath mid‐ocean ridges and are consistent with a model that effectively separates the processes of magma mixing and fractionation into different parts of a composite magma chamber. Magma mixing, as evidenced by disequilibrium relations between host liquids and included phenocrysts, is especially apparent in samples from low magma supply ridges and probably mainly arises from interactions between crystals of the mush zone and new injections of primitive magma rising out of the mantle. Magmatic differentiation beneath mid‐ocean ridges occurs in two parts. Migration of melts through the transition and mush zones can produce chemical trends consistent with in situ fractionation processes. Segregation of melt into molten horizons near the top of a composite magma chamber promotes the more extensive differentiation characteristic of fast spreading ridges. The optimum conditions for the formation of highly differentiated abyssal lavas is where small, discontinuous melt lenses occur, such as at intermediate spreading rates, in the vicinity of propagating rifts, and near ridge offsets at fast spreading ridges. Along‐axis homogenization of subaxial magma is inhibited by the thin, high aspect ratio of the melt lens and by the high viscosities expected in the mush and transition zones. Low magma supply ridges are unlikely to be underlain by eruptable magma in a steady state sense, and eruptions at slow spreading ridges are likely to be closely coupled in time to injection events of new magma from the mantle. Extensional events at high magma supply ridges, which are more likely to be underlain by significant volumes of low‐viscosity melt, can produce eruptions without requiring associated injection events. The critical magma supply necessary for the development of a melt lens near the top of a composite magma chamber is similar to that of normal ridges spreading at rates of about 50–70 mm/yr, a rate approximately corresponding to that marking an abrupt change in the morphology and gravity signal at the ridge axis. A composite magma chamber model can explain several previous enigmas concerning mid‐ocean ridge basalts, including why slow spreading ridges dominantly erupt a narrow range of relatively undifferentiated lavas, why magma mixing is most evident in lavas erupted from slow spreading ridges, why fast spreading ridges erupt a wide range of generally more differentiated compositions, why bimodal lava populations occur in the vicinity of some propagating rifts, and how along‐axis geochemical segmentation can occur at a scale shorter than the major tectonic segmentation of ridge axes." @default.
• W2107316430 created "2016-06-24" @default.
• W2107316430 creator A5004381482 @default.
• W2107316430 creator A5084087727 @default.
• W2107316430 date "1992-01-10" @default.
• W2107316430 modified "2023-10-17" @default.
• W2107316430 title "Mid‐ocean ridge magma chambers" @default.
• W2107316430 cites W11789709 @default.
• W2107316430 cites W152608127 @default.
• W2107316430 cites W1584937852 @default.
• W2107316430 cites W1964315624 @default.
• W2107316430 cites W1965017653 @default.
• W2107316430 cites W1967330082 @default.
• W2107316430 cites W1967746142 @default.
• W2107316430 cites W1970259035 @default.
• W2107316430 cites W1970260912 @default.
• W2107316430 cites W1970768454 @default.
• W2107316430 cites W1973057777 @default.
• W2107316430 cites W1974715783 @default.
• W2107316430 cites W1975477565 @default.
• W2107316430 cites W1976137074 @default.
• W2107316430 cites W1980606464 @default.
• W2107316430 cites W1983815388 @default.
• W2107316430 cites W1984373451 @default.
• W2107316430 cites W1985597348 @default.
• W2107316430 cites W1987893724 @default.
• W2107316430 cites W1989719468 @default.
• W2107316430 cites W1990740187 @default.
• W2107316430 cites W1990753486 @default.
• W2107316430 cites W1993648774 @default.
• W2107316430 cites W1994555833 @default.
• W2107316430 cites W1995591192 @default.
• W2107316430 cites W1995932149 @default.
• W2107316430 cites W1996154638 @default.
• W2107316430 cites W1996446601 @default.
• W2107316430 cites W1997899212 @default.
• W2107316430 cites W1997932126 @default.
• W2107316430 cites W2000449010 @default.
• W2107316430 cites W2000682950 @default.
• W2107316430 cites W2005123945 @default.
• W2107316430 cites W2005354462 @default.
• W2107316430 cites W2005897960 @default.
• W2107316430 cites W2009482731 @default.
• W2107316430 cites W2009762462 @default.
• W2107316430 cites W2010749247 @default.
• W2107316430 cites W2012023697 @default.
• W2107316430 cites W2012687636 @default.
• W2107316430 cites W2013090768 @default.
• W2107316430 cites W2013144763 @default.
• W2107316430 cites W2013539586 @default.
• W2107316430 cites W2014211704 @default.
• W2107316430 cites W2014332508 @default.
• W2107316430 cites W2014557550 @default.
• W2107316430 cites W2014623771 @default.
• W2107316430 cites W2016245192 @default.
• W2107316430 cites W2017088651 @default.
• W2107316430 cites W2017853565 @default.
• W2107316430 cites W2018804817 @default.
• W2107316430 cites W2020947429 @default.
• W2107316430 cites W2020969779 @default.
• W2107316430 cites W2021566918 @default.
• W2107316430 cites W2022450056 @default.
• W2107316430 cites W2022657202 @default.
• W2107316430 cites W2022949233 @default.
• W2107316430 cites W2023306659 @default.
• W2107316430 cites W2023476433 @default.
• W2107316430 cites W2023493420 @default.
• W2107316430 cites W2023509892 @default.
• W2107316430 cites W2024137847 @default.
• W2107316430 cites W2027967353 @default.
• W2107316430 cites W2029974429 @default.
• W2107316430 cites W2031015153 @default.
• W2107316430 cites W2037081802 @default.
• W2107316430 cites W2037666319 @default.
• W2107316430 cites W2040049557 @default.
• W2107316430 cites W2040110163 @default.
• W2107316430 cites W2041169676 @default.
• W2107316430 cites W2043693845 @default.
• W2107316430 cites W2048225836 @default.
• W2107316430 cites W2054767192 @default.
• W2107316430 cites W2058494160 @default.
• W2107316430 cites W2059236429 @default.
• W2107316430 cites W2060246142 @default.
• W2107316430 cites W2060601826 @default.
• W2107316430 cites W2060957967 @default.
• W2107316430 cites W2063205632 @default.
• W2107316430 cites W2063436373 @default.
• W2107316430 cites W2065063263 @default.
• W2107316430 cites W2068355095 @default.
• W2107316430 cites W2068541778 @default.
• W2107316430 cites W2068641796 @default.
• W2107316430 cites W2070406202 @default.
• W2107316430 cites W2073881300 @default.
• W2107316430 cites W2074647551 @default.
• W2107316430 cites W2075531765 @default.
• W2107316430 cites W2075845557 @default.
• W2107316430 cites W2076375680 @default.
• W2107316430 cites W2076755830 @default.

• next