Origin of enriched-type mid-ocean ridge basalt at ridges far from mantle plumes: The East Pacific Rise at 11°20′N
نویسندگان
چکیده
منابع مشابه
Magmatic filtering of mantle compositions at mid-ocean-ridge volcanoes
Earth’s dominant form of magmatism occurs at mid-ocean ridges (MORs), producing the igneous crust for two-thirds of the planet’s surface and conveying significant heat and material fluxes from the mantle to the world’s oceans. Mid-ocean-ridge basalt (MORB) magmas form from upwelling compositionally heterogeneous mantle1 by aggregation of near-fractional melts beneath spreading centres2. Multipl...
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Estimates of CO emissions at spreading centres, convergent margins, and plumes have been reviewed and upgraded 2 using observed CO r He ratios in magmatic volatiles, He content estimates in the magmatic sources, and magma 2 emplacement rates in the different tectonic settings. The effect of volatile fractionation during magma degassing, Ž . investigated using new rare gas and CO abundances dete...
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As the oceanic plates move apart at midocean ridges, rocks from Earth’s mantle, far below, rise to fill the void, mostly via slow plastic flow. As the rock approaches the top of its journey, however, partial melting occurs, so that the upper 6 kilometers of oceanic crust are composed of melts, which both erupt on the seafloor as lava and crystallize beneath the surface to form what are known as...
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Liquid water is not stable under current martian surface conditions, but the presence of small gullies on the polewardfacing slopes of midto highlatitude martian surfaces suggests that erosion by liquid water might have occurred. Costard et al. (p. 110) developed a global climate model for Mars when it had a higher obliquity (about 300,000 years ago). Their model shows that more melting of the ...
متن کاملVolcanic eruptions on mid-ocean ridges: New evidence from the superfast spreading East Pacific Rise, 17 –19 S
[1] Side-scan sonar, submersible observations and sampling of lava flows from the East Pacific Rise, 17 –19 S constrain the character and variability of submarine volcanic eruptions along mid-ocean ridges. Nine separate lava sequences were mapped using relative age and lithological contrasts among recovered samples. Axial lengths activated during eruptive episodes range from 1 to >18 km; indivi...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 1999
ISSN: 0148-0227
DOI: 10.1029/1998jb900037