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Magmatic Evolution of Early Subduction Zones : = Geochemical Modeling and Chemical Stratigraphy of Boninite and Fore Arc Basalt from the Bonin Fore Arc.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Magmatic Evolution of Early Subduction Zones :/
Reminder of title:	Geochemical Modeling and Chemical Stratigraphy of Boninite and Fore Arc Basalt from the Bonin Fore Arc.
Author:	Haugen, Emily Ann.
Description:	1 online resource (179 pages)
Notes:	Source: Masters Abstracts International, Volume: 56-04.
Contained By:	Masters Abstracts International56-04(E).
Subject:	Geology. -
Online resource:	click for full text (PQDT)
ISBN:	9781369778274

Magmatic Evolution of Early Subduction Zones : = Geochemical Modeling and Chemical Stratigraphy of Boninite and Fore Arc Basalt from the Bonin Fore Arc.
Haugen, Emily Ann.

Magmatic Evolution of Early Subduction Zones :Geochemical Modeling and Chemical Stratigraphy of Boninite and Fore Arc Basalt from the Bonin Fore Arc. - 1 online resource (179 pages)

Source: Masters Abstracts International, Volume: 56-04.

Thesis (M.S.)

Includes bibliographical references

IODP expedition 352 drilled four core in the Izu-Bonin fore arc in the Western Pacific. The Izu-Bonin fore arc records early subduction processes in the form of volcanics, notably Fore Arc Basalt (FAB) and boninite. FAB are Mid-Ocean Ridge Basalt (MORB)-like tholeiites with variable fluid mobile element enrichment and lower Ti/V ratio than MORB. Boninites are hydrous high-Mg andesite low in TiO2 with a distinct subduction zone character and extreme depletion of Rare Earth Elements (REE). These volcanics are used to track the evolution of a subduction zone from initiation to maturity with FAB produced first and boninite produced later. Forward modeling of mantle-derived melts from a Deplete MORB Mantle source composition produces FAB from &sim;20% melt in the spinel lherzolite field and 1% in the garnet lherzolite field. Boninite is modeled from high degrees of melt the FAB residue and requires an addition of melt to match the model with observed samples. Three types of boninite have been sampled, Basaltic Boninite (BB), Low-Silica Boninite (LSB), and High-Silica Boninite (HSB). Within the core, LSB is produced first with HSB modeled from the LSB residue. BB is generated throughout the core.

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

Mode of access: World Wide Web

ISBN: 9781369778274Subjects--Topical Terms:

670379
Geology.
Index Terms--Genre/Form:

554714
Electronic books.

Magmatic Evolution of Early Subduction Zones : = Geochemical Modeling and Chemical Stratigraphy of Boninite and Fore Arc Basalt from the Bonin Fore Arc.
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245 1 0 $a Magmatic Evolution of Early Subduction Zones : $b Geochemical Modeling and Chemical Stratigraphy of Boninite and Fore Arc Basalt from the Bonin Fore Arc.
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500 $a Source: Masters Abstracts International, Volume: 56-04.
500 $a Adviser: John W. Shervais.
502 $a Thesis (M.S.) $c Utah State University $d 2017.
504 $a Includes bibliographical references
520 $a IODP expedition 352 drilled four core in the Izu-Bonin fore arc in the Western Pacific. The Izu-Bonin fore arc records early subduction processes in the form of volcanics, notably Fore Arc Basalt (FAB) and boninite. FAB are Mid-Ocean Ridge Basalt (MORB)-like tholeiites with variable fluid mobile element enrichment and lower Ti/V ratio than MORB. Boninites are hydrous high-Mg andesite low in TiO2 with a distinct subduction zone character and extreme depletion of Rare Earth Elements (REE). These volcanics are used to track the evolution of a subduction zone from initiation to maturity with FAB produced first and boninite produced later. Forward modeling of mantle-derived melts from a Deplete MORB Mantle source composition produces FAB from &sim;20% melt in the spinel lherzolite field and 1% in the garnet lherzolite field. Boninite is modeled from high degrees of melt the FAB residue and requires an addition of melt to match the model with observed samples. Three types of boninite have been sampled, Basaltic Boninite (BB), Low-Silica Boninite (LSB), and High-Silica Boninite (HSB). Within the core, LSB is produced first with HSB modeled from the LSB residue. BB is generated throughout the core.
520 $a The geochemistry of the four core analyzed records period of recharge and fraction of the magma chamber. The base of Core U1442A and U1439C record a transition from more FAB-like samples to boninite samples from low Cr and high Al concentrations. Few of the shipboard-defined units record magma mixing as seen by the scatter in the depth plots and petrographically. Enrichment of Fluid Mobile Elements and High-Field Strength incompatible Elements indicate a subduction input in the form of fluids and melt.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Geology. $3 670379
655 7 $a Electronic books. $2 local $3 554714
690 $a 0372
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710 2 $a Utah State University. $b Geology. $3 1183477
773 0 $t Masters Abstracts International $g 56-04(E).
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