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Diffusion of rare earth elements in ...

Tirone, Massimiliano.

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Diffusion of rare earth elements in garnets and pyroxenes: Experiment, theory and applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Diffusion of rare earth elements in garnets and pyroxenes: Experiment, theory and applications./
作者:	Tirone, Massimiliano.
面頁冊數:	121 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-05, Section: B, page: 2257.
Contained By:	Dissertation Abstracts International63-05B.
標題:	Geochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3053869
ISBN:	0493680918

Diffusion of rare earth elements in garnets and pyroxenes: Experiment, theory and applications.
Tirone, Massimiliano.

Diffusion of rare earth elements in garnets and pyroxenes: Experiment, theory and applications. - 121 p.

Source: Dissertation Abstracts International, Volume: 63-05, Section: B, page: 2257.

Thesis (Ph.D.)--The University of Arizona, 2002.

This thesis consists of three main chapters preceded by an introduction that discusses the importance of diffusion in minerals to constrain the geochemistry of various magmatic processes.

ISBN: 0493680918Subjects--Topical Terms:

539092
Geochemistry.

Diffusion of rare earth elements in garnets and pyroxenes: Experiment, theory and applications.
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245 1 0 $a Diffusion of rare earth elements in garnets and pyroxenes: Experiment, theory and applications.
300 $a 121 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-05, Section: B, page: 2257.
500 $a Director: Jibamitra Ganguly.
502 $a Thesis (Ph.D.)--The University of Arizona, 2002.
520 $a This thesis consists of three main chapters preceded by an introduction that discusses the importance of diffusion in minerals to constrain the geochemistry of various magmatic processes.
520 $a The first chapter deals with the experimental technique and measurement of tracer element diffusion data in garnet and clinopyroxene. Self-diffusion coefficients of selected REE have been measured as a function of temperature (770°C–1050°) at 1 bar and oxygen fugacity (<italic>fO</italic><sub> 2</sub>) corresponding to that defined by the iron-wüstite buffer. The experimental results indicate small variations of diffusivity for REE in both garnet and clinopyroxene and an activation energy which is similar to the activation energy for diffusion of major components.
520 $a In the second chapter the atomistic mechanism of Nd diffusion in garnet is investigated by molecular dynamics (MD) simulation. An optimization procedure based on genetic algorithm provides the semi-empirical coefficients that are used to reproduce the repulsive forces between atoms. Results from MD simulations at high pressure and temperature show that Schottky defect is the most favorable mechanism for vacancy formation in the intrinsic region. The preferred reaction to incorporate neodymium in the dodecahedral site involves transferring an iron atom to the octahedral site after removing the aluminum atom from the lattice site. A model of diffusion in the extrinsic region with a prescribed vacancy defect fraction in the garnet (10<super>−4</super>) also provides an acceptable result.
520 $a The third chapter considers some of the potential applications of the REE diffusion data in garnet and clinopyroxene to magmatic processes. REE patterns obtained from the solution of a moving boundary problem shows that incompatible elements are more sensitive to disequilibration controlled by diffusion. Melt generated by disequilibrium melting is less enriched in incompatible elements than melt produced by an equilibrium melting process. Solution of a multiphase flow model, including the chemical transport equations with diffusion in a solid phase, permits a more realistic investigation of the disequilibrium melting process. During the ridge evolution the model predicts negligible effect of solid state diffusion on the geochemical evolution of the partial melt and the residual solid.
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