Characterizing the nature of the sub-continental lithospheric mantle beneath Prindle volcano, Yukon-Tanana Upland, Alaska
Prindle Volcano, an isolated alkali-basaltic cone in eastern Alaska is the northernmost volcanic center within the northern Cordilleran volcanic province (NCVP), a volcanic region along the northwestern region of North America. Prindle contains an ultramafic xenolith suite unlike any volcanic center...
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ftunivtexarling:oai:rc.library.uta.edu:10106/28157 2023-06-06T12:00:12+02:00 Characterizing the nature of the sub-continental lithospheric mantle beneath Prindle volcano, Yukon-Tanana Upland, Alaska Ussery, Ian Allen Loocke, Matthew P 2019-05-28T22:49:08Z application/pdf http://hdl.handle.net/10106/28157 en_US eng http://hdl.handle.net/10106/28157 Prindle volcano Mantle xenoliths Melt-rock reaction Canadian Cordillera Peridotites Thesis text 2019 ftunivtexarling 2023-04-13T18:53:24Z Prindle Volcano, an isolated alkali-basaltic cone in eastern Alaska is the northernmost volcanic center within the northern Cordilleran volcanic province (NCVP), a volcanic region along the northwestern region of North America. Prindle contains an ultramafic xenolith suite unlike any volcanic center within the region and perhaps the North American Cordillera. The suite provides an opportunity to examine the sub-continental lithospheric mantle beneath the region. Prindle volcano’s xenolith suite includes various lithologies: lherzolite, harzburgite, olivine-websterite, dunite, and clinopyroxenite. Utilizing petrographical and geochemical analysis, comparisons of mantle xenolith suites within the Cordillera, and suites from similar tectonic settings around the world we can constrain the processes for the Prindle xenolith suite. Textural characteristics within Prindle xenoliths suggest events including shear deformation followed by melt-rock reaction during porous reactive flow. Additionally, the textures and chemistry of the most depleted dunite and harzburgites suggest a supra-subduction zone setting for origination. The lherzolites, websterites, and clinopyroxenites share direct textural and geochemical relationships that suggest an origin through focused, porous reactive flow. Previous studies conducted on other xenoliths within the Cordillera farther south identified a ~100-200°C temperature anomaly in the upper mantle beneath the NCVP due to a subducted slab window. Numerous studies indicate that the anomaly affects volcanic centers in the region. Prindle, however, resides on the margin of the mantle anomaly. With the evidence presented here, we suggest that the Prindle xenolith suite is derived from a localized lithospheric shear zone created by regional uplift above the anomaly located to the southeast. After the shear zone developed, a melt-rock reaction event by focused porous reactive flow with an alkaline fluid/melt occurred. It is surmised that the variability located at Prindle is due to the limited ... Thesis Alaska Yukon University of Texas Arlington: UTA ResearchCommons Yukon |
institution |
Open Polar |
collection |
University of Texas Arlington: UTA ResearchCommons |
op_collection_id |
ftunivtexarling |
language |
English |
topic |
Prindle volcano Mantle xenoliths Melt-rock reaction Canadian Cordillera Peridotites |
spellingShingle |
Prindle volcano Mantle xenoliths Melt-rock reaction Canadian Cordillera Peridotites Ussery, Ian Allen Characterizing the nature of the sub-continental lithospheric mantle beneath Prindle volcano, Yukon-Tanana Upland, Alaska |
topic_facet |
Prindle volcano Mantle xenoliths Melt-rock reaction Canadian Cordillera Peridotites |
description |
Prindle Volcano, an isolated alkali-basaltic cone in eastern Alaska is the northernmost volcanic center within the northern Cordilleran volcanic province (NCVP), a volcanic region along the northwestern region of North America. Prindle contains an ultramafic xenolith suite unlike any volcanic center within the region and perhaps the North American Cordillera. The suite provides an opportunity to examine the sub-continental lithospheric mantle beneath the region. Prindle volcano’s xenolith suite includes various lithologies: lherzolite, harzburgite, olivine-websterite, dunite, and clinopyroxenite. Utilizing petrographical and geochemical analysis, comparisons of mantle xenolith suites within the Cordillera, and suites from similar tectonic settings around the world we can constrain the processes for the Prindle xenolith suite. Textural characteristics within Prindle xenoliths suggest events including shear deformation followed by melt-rock reaction during porous reactive flow. Additionally, the textures and chemistry of the most depleted dunite and harzburgites suggest a supra-subduction zone setting for origination. The lherzolites, websterites, and clinopyroxenites share direct textural and geochemical relationships that suggest an origin through focused, porous reactive flow. Previous studies conducted on other xenoliths within the Cordillera farther south identified a ~100-200°C temperature anomaly in the upper mantle beneath the NCVP due to a subducted slab window. Numerous studies indicate that the anomaly affects volcanic centers in the region. Prindle, however, resides on the margin of the mantle anomaly. With the evidence presented here, we suggest that the Prindle xenolith suite is derived from a localized lithospheric shear zone created by regional uplift above the anomaly located to the southeast. After the shear zone developed, a melt-rock reaction event by focused porous reactive flow with an alkaline fluid/melt occurred. It is surmised that the variability located at Prindle is due to the limited ... |
author2 |
Loocke, Matthew P |
format |
Thesis |
author |
Ussery, Ian Allen |
author_facet |
Ussery, Ian Allen |
author_sort |
Ussery, Ian Allen |
title |
Characterizing the nature of the sub-continental lithospheric mantle beneath Prindle volcano, Yukon-Tanana Upland, Alaska |
title_short |
Characterizing the nature of the sub-continental lithospheric mantle beneath Prindle volcano, Yukon-Tanana Upland, Alaska |
title_full |
Characterizing the nature of the sub-continental lithospheric mantle beneath Prindle volcano, Yukon-Tanana Upland, Alaska |
title_fullStr |
Characterizing the nature of the sub-continental lithospheric mantle beneath Prindle volcano, Yukon-Tanana Upland, Alaska |
title_full_unstemmed |
Characterizing the nature of the sub-continental lithospheric mantle beneath Prindle volcano, Yukon-Tanana Upland, Alaska |
title_sort |
characterizing the nature of the sub-continental lithospheric mantle beneath prindle volcano, yukon-tanana upland, alaska |
publishDate |
2019 |
url |
http://hdl.handle.net/10106/28157 |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
Alaska Yukon |
genre_facet |
Alaska Yukon |
op_relation |
http://hdl.handle.net/10106/28157 |
_version_ |
1767950822258245632 |