O-H_Stable_Isotopes

From mitchell 1986 kimberlites mineralogy geochemistry

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Unformatted text preview: l Alkaline Magmatism. Kimberlites Figure 19.19. Model of an idealized kimberlite system, illustrating the hypabyssal dike-sill complex leading to a diatreme and tuff ring explosive crater. This model is not to scale, as the diatreme portion is expanded to illustrate it better. From Mitchell (1986) Kimberlites: Mineralogy, Geochemistry, and Petrology. Plenum. New York. Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Prentice Hall. Wednesday, 15 August, 12 Oxygen Isotopes of Earth Materials Mantle δ18O very restricted! Wednesday, 15 August, 12 Sea floor alteration (Oxygen exchange, biogenic C added) (Nat Geog) Wednesday, 15 August, 12 Island Arc Petrogenesis From Winter (2001) Figure 16-11b. A proposed model for subduction zone magmatism with particular reference to island arcs. Dehydration of slab crust causes hydration of the mantle (violet), which undergoes partial melting as amphibole (A) and phlogopite (B) dehydrate. From Tatsumi (1989), J. Geophys. Res., 94, 4697-4707 and Tatsumi and Eggins (1995). Subduction Zone Magmatism. Blackwell. Oxford. Wednesday, 15 August, 12 From Helmstaedt et al. (2010) Wednesday, 15 August, 12 From Shulze et al. (2003) Wednesday, 15 August, 12 Summary • Stable isotopes: definitions, terminology and notation. • H and O-isotopes - mostly for tracing fluids and fluid-rock related processes. • Sources of fluids - variations as a function of latitude and altitude and source regions. • Fluid-rock interaction. Wednesday, 15 August, 12...
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This document was uploaded on 03/06/2014 for the course ES 4502 at Memorial University.

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