Magmatic Differentiation in Arc and Mid Ocean Ridge Settings
The compositional variation of igneous rocks and construction of Earth's crust is the result of magmatic differentiation -- crystallization, melting, and assimilation mechanisms that cause the composition of magmas to change over time. This thesis investigates magma generation and evolution at...
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California Institute of Technology
2021
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ftdatacite:10.7907/a1ky-ab66 2023-05-15T14:02:22+02:00 Magmatic Differentiation in Arc and Mid Ocean Ridge Settings Lewis, Madeline Janine 2021 PDF https://dx.doi.org/10.7907/a1ky-ab66 https://resolver.caltech.edu/CaltechTHESIS:06022021-034345855 en eng California Institute of Technology No commercial reproduction, distribution, display or performance rights in this work are provided. Magma differentiation geochronology magmatic arc volcano iron formation Geochemistry FOS Earth and related environmental sciences geochemistry mid-ocean ridge petrology Thesis Text Dissertation thesis 2021 ftdatacite https://doi.org/10.7907/a1ky-ab66 2021-11-05T12:55:41Z The compositional variation of igneous rocks and construction of Earth's crust is the result of magmatic differentiation -- crystallization, melting, and assimilation mechanisms that cause the composition of magmas to change over time. This thesis investigates magma generation and evolution at both convergent and divergent plate boundaries. The resulting magmatic arcs and mid-ocean ridges create the vast majority of Earth's crust, though the details of crustal construction and the specific processes that generate the observed magmatic and volcanic products are complex. Accordingly, this work uses the geochemical signatures encoded in rocks and minerals to explain magmatic differentiation histories in multiple tectonic settings. Here, I present five main studies that utilize field and textural observations, geochemical analyses, and computational modeling to investigate the compositional structure of the crust beneath magmatic arcs and mid-ocean ridges. In addition, this work explores the pyroclastic and sedimentary products dispersed by magmatically heated hydrothermal fluids in submarine environments. Chapters 2 and 3 investigate the crystallization histories of mafic intrusions in the eastern-central Sierra Nevada batholith paleo-continental arc, California. This work has implications for the compositional and temporal generation of both mafic and evolved magmas throughout the batholith and in other continental arcs. Chapters 4 and 5 explore records of submarine volcanic ash deposits associated with explosive mid-ocean ridge eruptions from the East Pacific Rise and Pacific-Antarctic Ridge, as well as the effects that sea level change has on melting of the mantle, eruption styles, and the compositional evolution of mid-ocean ridge magmas. Chapter 6 examines the mineral hosting of rare earth elements (REEs) in the Wadi Karim banded iron formation, and the implications of element mobility on interpretations based on REE abundances. Thesis Antarc* Antarctic DataCite Metadata Store (German National Library of Science and Technology) Antarctic Pacific |
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DataCite Metadata Store (German National Library of Science and Technology) |
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English |
topic |
Magma differentiation geochronology magmatic arc volcano iron formation Geochemistry FOS Earth and related environmental sciences geochemistry mid-ocean ridge petrology |
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Magma differentiation geochronology magmatic arc volcano iron formation Geochemistry FOS Earth and related environmental sciences geochemistry mid-ocean ridge petrology Lewis, Madeline Janine Magmatic Differentiation in Arc and Mid Ocean Ridge Settings |
topic_facet |
Magma differentiation geochronology magmatic arc volcano iron formation Geochemistry FOS Earth and related environmental sciences geochemistry mid-ocean ridge petrology |
description |
The compositional variation of igneous rocks and construction of Earth's crust is the result of magmatic differentiation -- crystallization, melting, and assimilation mechanisms that cause the composition of magmas to change over time. This thesis investigates magma generation and evolution at both convergent and divergent plate boundaries. The resulting magmatic arcs and mid-ocean ridges create the vast majority of Earth's crust, though the details of crustal construction and the specific processes that generate the observed magmatic and volcanic products are complex. Accordingly, this work uses the geochemical signatures encoded in rocks and minerals to explain magmatic differentiation histories in multiple tectonic settings. Here, I present five main studies that utilize field and textural observations, geochemical analyses, and computational modeling to investigate the compositional structure of the crust beneath magmatic arcs and mid-ocean ridges. In addition, this work explores the pyroclastic and sedimentary products dispersed by magmatically heated hydrothermal fluids in submarine environments. Chapters 2 and 3 investigate the crystallization histories of mafic intrusions in the eastern-central Sierra Nevada batholith paleo-continental arc, California. This work has implications for the compositional and temporal generation of both mafic and evolved magmas throughout the batholith and in other continental arcs. Chapters 4 and 5 explore records of submarine volcanic ash deposits associated with explosive mid-ocean ridge eruptions from the East Pacific Rise and Pacific-Antarctic Ridge, as well as the effects that sea level change has on melting of the mantle, eruption styles, and the compositional evolution of mid-ocean ridge magmas. Chapter 6 examines the mineral hosting of rare earth elements (REEs) in the Wadi Karim banded iron formation, and the implications of element mobility on interpretations based on REE abundances. |
format |
Thesis |
author |
Lewis, Madeline Janine |
author_facet |
Lewis, Madeline Janine |
author_sort |
Lewis, Madeline Janine |
title |
Magmatic Differentiation in Arc and Mid Ocean Ridge Settings |
title_short |
Magmatic Differentiation in Arc and Mid Ocean Ridge Settings |
title_full |
Magmatic Differentiation in Arc and Mid Ocean Ridge Settings |
title_fullStr |
Magmatic Differentiation in Arc and Mid Ocean Ridge Settings |
title_full_unstemmed |
Magmatic Differentiation in Arc and Mid Ocean Ridge Settings |
title_sort |
magmatic differentiation in arc and mid ocean ridge settings |
publisher |
California Institute of Technology |
publishDate |
2021 |
url |
https://dx.doi.org/10.7907/a1ky-ab66 https://resolver.caltech.edu/CaltechTHESIS:06022021-034345855 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_rights |
No commercial reproduction, distribution, display or performance rights in this work are provided. |
op_doi |
https://doi.org/10.7907/a1ky-ab66 |
_version_ |
1766272604879978496 |