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Magmatic evolution of the north Tanzanian divergence zone, East African rift system
Descriptive
TitleInfo
Title
Magmatic evolution of the north Tanzanian divergence zone, East African rift system
Name
(type = personal)
NamePart
(type = family)
Mana
NamePart
(type = given)
Sara
NamePart
(type = date)
1983-
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Sara Mana
Role
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(authority = RULIB)
author
Name
(type = personal)
NamePart
(type = family)
Swisher
NamePart
(type = given)
Carl C.
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Carl C. Swisher
Affiliation
Advisory Committee
Role
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chair
Name
(type = personal)
NamePart
(type = family)
Carr
NamePart
(type = given)
Michael J.
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Michael J. Carr
Affiliation
Advisory Committee
Role
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(authority = RULIB)
internal member
Name
(type = personal)
NamePart
(type = family)
Feigenson
NamePart
(type = given)
Mark D.
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Mark D. Feigenson
Affiliation
Advisory Committee
Role
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(authority = RULIB)
internal member
Name
(type = personal)
NamePart
(type = family)
Furman
NamePart
(type = given)
Tanya
DisplayForm
Tanya Furman
Affiliation
Advisory Committee
Role
RoleTerm
(authority = RULIB)
outside member
Name
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NamePart
Rutgers University
Role
RoleTerm
(authority = RULIB)
degree grantor
Name
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NamePart
Graduate School - New Brunswick
Role
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school
TypeOfResource
Text
Genre
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theses
OriginInfo
DateCreated
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2013
DateOther
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2013-10
Place
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xx
Language
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(type = code)
eng
Abstract
(type = abstract)
My study focuses on the magmatic evolution of the North Tanzanian Divergence zone (NTD). Using high precision 40Ar/39Ar geochronology I identify stages of magmatic activity and episodes of progressive magma migration. The newly developed temporal framework combined with elemental and isotopic geochemistry allows me to understand how the melting process has changed during the spatial and temporal evolution of the NTD. I use the abundances of key trace elements to identify the source mineralogy; including rare earth element (REE) modeling to constrain depths of melt separation. In addition, I employ radiogenic Sr-Nd-Pb isotope ratios to identify possible contributions from different mantle and crustal components. The NTD represents an example of an early stage continental rifting where lithospheric melts are generated during the interaction of a mantle plume and a heterogeneous metasomatized lithosphere. Melting occurs in the garnet stability zone. The first melt produced derives from fusible amphibole rich veins. Through the NTD rifting development, melting conditions change to generate alkali basalts with systematically different isotopic signatures. This episode of magmatism consists of an intense pulse, related to the inception of rifting, and characterized by melt separation occurring at shallower depths. The observed chemical signature can be explained either with the involvement of contributions from plume related fluids, or by melting of layered lithosphere. Subsequent volcanism has features consistent with mixing between the first two events. Through time we observe an eastwards migration of the magmatic activity consistent with the hypothesis of a fixed mantle plume and an overall westward migration of the African plate.
Subject
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Topic
Geological Sciences
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TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
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ETD_4921
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electronic resource
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Note
Supplementary File: Appendix C - 40Ar/39Ar incremental heating data and analytical conditions
Extent
xii, 139 p. : ill.
Note
(type = degree)
Ph.D.
Note
(type = bibliography)
Includes bibliographical references
Note
(type = vita)
Includes vita
Note
(type = statement of responsibility)
by Sara Mana
Subject
(authority = ETD-LCSH)
Topic
Rifts (Geology)--Tanzania
Subject
(authority = ETD-LCSH)
Topic
Magmatism--Tanzania
RelatedItem
(type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier
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rucore19991600001
Location
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NjNbRU
Identifier
(type = doi)
doi:10.7282/T3V40S7W
Genre
(authority = ExL-Esploro)
ETD doctoral
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Rights
RightsDeclaration
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The author owns the copyright to this work.
RightsHolder
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Name
FamilyName
Mana
GivenName
Sara
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime
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(qualifier = exact);
(point = start)
2013-07-25 12:18:37
AssociatedEntity
Name
Sara Mana
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
RightsEvent
DateTime
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(qualifier = exact);
(point = start)
2013-10-31
DateTime
(encoding = w3cdtf);
(qualifier = exact);
(point = end)
2015-10-31
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after October 31st, 2015.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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Technical
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ETD
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windows xp
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ETD
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