Central Anomaly Magnetization High documentation of crustal accretion along the East Pacific Rise (9°55′-9°25′N)
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چکیده
منابع مشابه
Evidence and implications of crustal magmatism on the flanks of the East Pacific Rise
a r t i c l e i n f o Keywords: East Pacific Rise mid-ocean ridge oceanic crust off-axis magmatism waveform modeling Formation of oceanic crust along the East Pacific Rise is thought to be complete within a few kilometers of the rise axis. Here, however, we present evidence for magmatism 20 km from the spreading center in 300-ka-old crust. Seismic data reveal an intrusive complex ~ 2 km beneath...
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_Abstract. An active source electromagnetic (EM) sounding has been conducted on the axis of the East Pacific Rise (EPR) at 13 ø 10 •N. 1D inversion and modelling techniques, seeking resistivity as a function of depth, have been applied to 8 Ilz amplitude data collected along the ridge crest. Resistivity is seen to increase monotonically between 50 m and 1 km below the seafloor, increasing from ...
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Although the source layer for marine magnetic anomalies has been assumed to be the extrusive basalts of uppermost ocean crust, recent studies indicate that lower crustal rocks may also contribute. Because the temperature at which magnetization of crustal rocks achieves long-term stability is crucial to any source layer contribution, we undertook hightemperature VRM (viscous remanent magnetizati...
متن کاملStauromedusan populations inhabiting deep-sea hydrothermal vents along the southern East Pacific Rise
Dense populations of “stalked jellyfish” (Stauromedusae) were encountered at two geographically-separated, deep-sea hydrothermal vent fields located at 7°26’S; and 20°02’S along the East Pacific Rise (EPR). DSV Alvin was utilized (on dives 3320 and 3334) at the sites to collect numerous stauromedusans, which were immediately frozen (at -70°C) or preserved in 70% ethanol upon arrival on board th...
متن کاملFine Structure of an Oceanic Crustal Section near the East Pacific Rise by D. v. Helmberger and G. Engen
In this study we model synthetically a complete seismic profile of roughly 20m.y.-old crust located to the west of the East Pacific Rise, 3.37S, 114.13W. The results indicate a rather strong velocity gradient below the sediments with little evidence of layering in the upper crust and a slightly dipping oceanic layer. The crust-to-mantle transition zone appears sharp providing a relatively good ...
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ژورنال
عنوان ژورنال: Geochemistry, Geophysics, Geosystems
سال: 2008
ISSN: 1525-2027
DOI: 10.1029/2007gc001611