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dc.contributor.authorGleeson, Matthewen
dc.date.accessioned2020-07-17T09:52:58Z
dc.date.available2020-07-17T09:52:58Z
dc.date.submitted2019-12-20en
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/308052
dc.description.abstractOcean Island Basalts (OIBs) and Mid-Ocean Ridge Basalts (MORBs) provide a window into the composition, lithological properties, and volatile content of the Earth's, highly heterogeneous, convecting mantle. Our view of the Earth's mantle is, however, partially obscured by processes that influence mantle-derived melts as they transition through the lithosphere (e.g. mixing, assimilation). Nevertheless, via careful consideration of the magmatic processes that may influence these mantle-derived melts, we can use OIBs and MORBs to place important constraints on the composition and dynamics of the Earth's convecting mantle. This study focuses on the Galápagos Archipelago, one of the most volcanically active regions in the world, where volcanic activity is derived from melting in a deep-seated mantle plume (possibly originating at the core-mantle boundary). The Galápagos mantle plume is hypothesised to contain primordial and depleted mantle material, as well as at least one component that may represent recycled oceanic crust. Therefore, the Galápagos Archipelago, and nearby Galápagos Spreading Centre, represent an ideal location to study the location, nature and influence of mantle heterogeneity in an upwelling mantle plume. This thesis addresses four key aspects of magmatic activity in the Galápagos Archipelago: (i) the presence of pyroxenite (recycled) components in the Galápagos mantle plume [Chapters 2 and 3]; (ii) the nature and implications of plume-ridge interaction in the Galápagos [Chapters 3 and 4]; (iii) the volatile content of the Galápagos mantle plume [Chapters 4 and 6]; and (iv) the magmatic processes that operate beneath low-melt flux regions of the Galápagos Archipelago [Chapter 5]. As a result, this thesis provides fresh new insights into the nature of mantle heterogeneity beneath the Galápagos and the influence of mantle heterogeneity on the crustal processing of magmas in the Galápagos Archipelago.en
dc.description.sponsorshipNE/L002507/1en
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectGeologyen
dc.subjectPyroxeniteen
dc.subjectMantle Geochemistryen
dc.subjectVolcanologyen
dc.subjectIgneous Petrologyen
dc.titleInsights into the location, nature and influence of mantle heterogeneity in the Galápagos mantle plumeen
dc.typeThesis
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnameDoctor of Philosophy (PhD)en
dc.publisher.institutionUniversity of Cambridgeen
dc.publisher.departmentDepartment of Earth Sciencesen
dc.publisher.departmentJesus
dc.identifier.doi10.17863/CAM.55147
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
dc.contributor.orcidGleeson, Matthew [0000-0003-0839-5492]
rioxxterms.typeThesisen
dc.publisher.collegeDepartment of Earth Sciences
dc.type.qualificationtitlePhD in Earth Sciencesen
pubs.funder-project-idNERC (1772906)
cam.supervisorGibson, Sally
rioxxterms.freetoread.startdate2021-07-17


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International