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Examination of Magmatic Differentiation Processes in the Formation of Intermediate and Silicic Composition Magmas : = Constraints from Regional and Global Geochemical Systematics.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Examination of Magmatic Differentiation Processes in the Formation of Intermediate and Silicic Composition Magmas :/
Reminder of title:	Constraints from Regional and Global Geochemical Systematics.
Author:	Farner, Michael Joseph.
Description:	1 online resource (187 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 79-05(E), Section: B.
Contained By:	Dissertation Abstracts International79-05B(E).
Subject:	Geochemistry. -
Online resource:	click for full text (PQDT)
ISBN:	9780355382631

Examination of Magmatic Differentiation Processes in the Formation of Intermediate and Silicic Composition Magmas : = Constraints from Regional and Global Geochemical Systematics.
Farner, Michael Joseph.

Examination of Magmatic Differentiation Processes in the Formation of Intermediate and Silicic Composition Magmas :Constraints from Regional and Global Geochemical Systematics. - 1 online resource (187 pages)

Source: Dissertation Abstracts International, Volume: 79-05(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

Granitic rocks and mafic enclaves from the Bernasconi Hills pluton in the Peninsular Ranges Batholith, California, USA provide constraint on the extent and spatial lengthscale of mafic-felsic interaction in upper crustal granitic plutons. Further detailed mapping of mineralogical variations in the pluton and among enclaves highlights late-stage magmatic processes such as segregation of evolved residual melt and reactions between solidified enclaves and granitic melts. Collectively, the field, mineralogical and geochemical systematics of the Bernasconi Hills pluton show that mafic-felsic mixing between host granitic magma and partially solidified mafic enclaves was limited spatially, on the order of meters, and only proceeded to an early, incipient stage. Phosphorus-zirconium systematics indicate that the pluton developed through a combination of crystal fractionation and incipient mixing, in contrast to volcanic rocks, where magmatic evolution is primarily driven by crystal fractionation. Further examination of global geochemical systematics of subaerial arc lavas show a correlation between SiO2 and crustal thickness as expressed by elevation. Arc lavas become more compositionally evolved with increasing elevation/crustal thickness, tend towards increasingly iron-depleted, or calc-alkaline, compositions and show evidence for garnet fractionation at depth in thick arcs. Coupled thermal and thermodynamic compositional modeling indicates that crustal thickness controls arc lava compositions by modifying the thermal lifespan and segregation times of melt in crustal magma chambers.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355382631Subjects--Topical Terms:

648291
Geochemistry.
Index Terms--Genre/Form:

554714
Electronic books.

Examination of Magmatic Differentiation Processes in the Formation of Intermediate and Silicic Composition Magmas : = Constraints from Regional and Global Geochemical Systematics.
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504 $a Includes bibliographical references
520 $a Granitic rocks and mafic enclaves from the Bernasconi Hills pluton in the Peninsular Ranges Batholith, California, USA provide constraint on the extent and spatial lengthscale of mafic-felsic interaction in upper crustal granitic plutons. Further detailed mapping of mineralogical variations in the pluton and among enclaves highlights late-stage magmatic processes such as segregation of evolved residual melt and reactions between solidified enclaves and granitic melts. Collectively, the field, mineralogical and geochemical systematics of the Bernasconi Hills pluton show that mafic-felsic mixing between host granitic magma and partially solidified mafic enclaves was limited spatially, on the order of meters, and only proceeded to an early, incipient stage. Phosphorus-zirconium systematics indicate that the pluton developed through a combination of crystal fractionation and incipient mixing, in contrast to volcanic rocks, where magmatic evolution is primarily driven by crystal fractionation. Further examination of global geochemical systematics of subaerial arc lavas show a correlation between SiO2 and crustal thickness as expressed by elevation. Arc lavas become more compositionally evolved with increasing elevation/crustal thickness, tend towards increasingly iron-depleted, or calc-alkaline, compositions and show evidence for garnet fractionation at depth in thick arcs. Coupled thermal and thermodynamic compositional modeling indicates that crustal thickness controls arc lava compositions by modifying the thermal lifespan and segregation times of melt in crustal magma chambers.
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