Search results
Results From The WOW.Com Content Network
Identified mantle components are DMM (depleted mid-ocean ridge basalt (MORB) mantle), HIMU (high U/Pb-ratio mantle), EM1 (enriched mantle 1), EM2 (enriched mantle 2) and FOZO (focus zone). [ 22 ] [ 23 ] This geochemical signature arises from the mixing of near-surface materials such as subducted slabs and continental sediments, in the mantle ...
Mantle plumes were first proposed by J. Tuzo Wilson in 1963 [4] [non-primary source needed] and further developed by W. Jason Morgan in 1971. A mantle plume is posited to exist where hot rock nucleates [clarification needed] at the core-mantle boundary and rises through the Earth's mantle becoming a diapir in the Earth's crust. [5]
That mantle plumes are much more complex than originally hypothesised and move independently of each other and plates is now used to explain such observations. [ 8 ] In 2020, Wei et al. used seismic tomography to detect the oceanic plateau, formed about 100 million years ago by the hypothesized mantle plume head of the Hawaii-Emperor seamount ...
CLIP volcanism originates from the plume-like source distinct from a MORB (mid-ocean ridge basalt) mantle. The long duration of CLIP volcanism can be explained by the interaction between a plume and the Greater Antilles subduction zone. [4] The margins of the CLIP have been uplifted and are exposed above sea level, which makes it unique among ...
The formation and development of plumes in the early mantle contributed to triggering the lateral movement of crust across the Earth's surface. [18] The effect of upwelling mantle plumes on the lithosphere can be seen today through local depressions around hotspots such as Hawaii. The scale of this impact is much less than that exhibited in the ...
The deep mantle plume hypothesis on Canary hotspot formation proposes how the current-day Canary islands rested above a province of tholeiitic magma during the Triassic Period. The province, known as the Central Atlantic Magmatic Province (CAMP), became active and extended over 10 million km 2 , developing into what scientists call today the ...
After 60 years of trying, geologists finally pried rocks from Earth's upper mantle. That's huge for so many reasons.
At subduction zones, slabs of oceanic crust sink into the mantle, dehydrate, and release volatiles which lower the melting temperature and give rise to volcanic arcs and back-arc extensions. Several volcanic provinces, however, do not fit this simple picture and have traditionally been considered exceptional cases which require a non-plate ...