origin of magma
Francis & Oppenheimer state volcanism as “the manifestation at the surface of a planet or satellite of internal thermal processes through the emission of solid, liquid or gaseous products”
Controls on Magma Production
In order to obtain magma we need something to melt, and a means of melting it.
HEAT
• primordial heat of accretion (K.E., self-compression, core formation)
• tidal dissipation (c.f. Io)
• Radioactivity
Earth’s heat through time;
dN/dt = -λt D = Ne-λ -1
radioactive heat contribution with time is a function of
• nuclide abundance (N.B. distribution)
• nuclide λ
• effects of short t1/2 isotopes
overall decline in heat through time: efficiency of heat transfer varies with radiation, convection, conduction. Implications for higher heat flow in past?
• magma ocean?
• magma compositions and fluxes
• planetary differentiation
• plate tectonics…..when did it start??
COMPOSITION (Material to melt); planet is (now) differentiated
• crust
• mantle
Comparison of the chondritic model with direct observation (crustal rocks, mantle xenoliths, basalts, ophiolites, alpine peridotites)
• Volatile loss during accretion
• Moon formation
• Importance of (igneous) differentiation in generating crust-mantle-ore
Last Completed Projects
| topic title | academic level | Writer | delivered |
|---|
Are you looking for a similar paper or any other quality academic essay? Then look no further. Our research paper writing service is what you require. Our team of experienced writers is on standby to deliver to you an original paper as per your specified instructions with zero plagiarism guaranteed. This is the perfect way you can prepare your own unique academic paper and score the grades you deserve.
Use the order calculator below and get started! Contact our live support team for any assistance or inquiry.
[order_calculator]