Exhumation and incision history of the Torngat Mountains, northern Labrador and Quebec, Canada, using apatite (U-Th)/He thermochronology
M.S. University of Kansas, Geology 2005 Apatite (U-Th)/He thermochronological data provide new insights into the exhumation history of the Torngat Mountains, which are located in Ungava Peninsula, northern Labrador and Quebec, Canada. Latest Jurassic to earliest Cretaceous rifting resulted in crusta...
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/30608 2023-05-15T17:06:08+02:00 Exhumation and incision history of the Torngat Mountains, northern Labrador and Quebec, Canada, using apatite (U-Th)/He thermochronology Centeno, Juan Pablo 2020-08-18T02:40:13Z http://hdl.handle.net/1808/30608 unknown University of Kansas http://hdl.handle.net/1808/30608 This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. openAccess Thesis 2020 ftunivkansas 2022-08-26T13:25:36Z M.S. University of Kansas, Geology 2005 Apatite (U-Th)/He thermochronological data provide new insights into the exhumation history of the Torngat Mountains, which are located in Ungava Peninsula, northern Labrador and Quebec, Canada. Latest Jurassic to earliest Cretaceous rifting resulted in crustal extension and opening of the Labrador Sea, causing westward tilting and exhumation of the Labrador continental margin. Post-rift erosion and incision led to the formation of significant topographic relief in the Torngat Mountains. Thermal modeling of apatite (U-Th)/He thermochronological data from a vertical sample transect indicates that rapid cooling starting at ~140-150 Ma, which closely coincides in age with independent geological evidence for initial rifting in the area. Apatite (U-Th)/He ages along an E-W transect, which was collected perpendicular to the Torngat Mountains and the Labrador coast, record differential extensional and erosional exhumation diminishing westwards towards the interior of Ungava Peninsula. Ages near the Labrador coastline are as young as ~ 78 Ma and are significantly younger than the timing of onset of initial rifting (~140-150 Ma); this suggests significant amounts (~1-2 km) of post-rift erosion and incision along the eastern continental margin of the Labrador Sea. West of the Torngat Mountains, along the E-W transect, apatite (U-Th)/He ages also show evidence of substantial post-rift erosion likely related to Mesozoic and Tertiary fluvial erosion or to Pleistocene continental glaciation. Two constant-elevation N-S transects collected parallel to the Labrador coast show apatite (U-Th)/He ages that mimic the larger scale topographic features of the area, such as major rivers and fiords, indicating a deflection of shallow crustal isotherms due to post-rift development of highamplitude topography. Additional numerical modeling is required to refine the timing and spatial magnitude of post-rift erosion in more detail. Thesis Labrador Sea Ungava peninsula The University of Kansas: KU ScholarWorks Canada Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Torngat Mountains ENVELOPE(-63.665,-63.665,59.000,59.000) Ungava Peninsula ENVELOPE(-73.999,-73.999,60.000,60.000) |
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Open Polar |
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The University of Kansas: KU ScholarWorks |
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ftunivkansas |
language |
unknown |
description |
M.S. University of Kansas, Geology 2005 Apatite (U-Th)/He thermochronological data provide new insights into the exhumation history of the Torngat Mountains, which are located in Ungava Peninsula, northern Labrador and Quebec, Canada. Latest Jurassic to earliest Cretaceous rifting resulted in crustal extension and opening of the Labrador Sea, causing westward tilting and exhumation of the Labrador continental margin. Post-rift erosion and incision led to the formation of significant topographic relief in the Torngat Mountains. Thermal modeling of apatite (U-Th)/He thermochronological data from a vertical sample transect indicates that rapid cooling starting at ~140-150 Ma, which closely coincides in age with independent geological evidence for initial rifting in the area. Apatite (U-Th)/He ages along an E-W transect, which was collected perpendicular to the Torngat Mountains and the Labrador coast, record differential extensional and erosional exhumation diminishing westwards towards the interior of Ungava Peninsula. Ages near the Labrador coastline are as young as ~ 78 Ma and are significantly younger than the timing of onset of initial rifting (~140-150 Ma); this suggests significant amounts (~1-2 km) of post-rift erosion and incision along the eastern continental margin of the Labrador Sea. West of the Torngat Mountains, along the E-W transect, apatite (U-Th)/He ages also show evidence of substantial post-rift erosion likely related to Mesozoic and Tertiary fluvial erosion or to Pleistocene continental glaciation. Two constant-elevation N-S transects collected parallel to the Labrador coast show apatite (U-Th)/He ages that mimic the larger scale topographic features of the area, such as major rivers and fiords, indicating a deflection of shallow crustal isotherms due to post-rift development of highamplitude topography. Additional numerical modeling is required to refine the timing and spatial magnitude of post-rift erosion in more detail. |
format |
Thesis |
author |
Centeno, Juan Pablo |
spellingShingle |
Centeno, Juan Pablo Exhumation and incision history of the Torngat Mountains, northern Labrador and Quebec, Canada, using apatite (U-Th)/He thermochronology |
author_facet |
Centeno, Juan Pablo |
author_sort |
Centeno, Juan Pablo |
title |
Exhumation and incision history of the Torngat Mountains, northern Labrador and Quebec, Canada, using apatite (U-Th)/He thermochronology |
title_short |
Exhumation and incision history of the Torngat Mountains, northern Labrador and Quebec, Canada, using apatite (U-Th)/He thermochronology |
title_full |
Exhumation and incision history of the Torngat Mountains, northern Labrador and Quebec, Canada, using apatite (U-Th)/He thermochronology |
title_fullStr |
Exhumation and incision history of the Torngat Mountains, northern Labrador and Quebec, Canada, using apatite (U-Th)/He thermochronology |
title_full_unstemmed |
Exhumation and incision history of the Torngat Mountains, northern Labrador and Quebec, Canada, using apatite (U-Th)/He thermochronology |
title_sort |
exhumation and incision history of the torngat mountains, northern labrador and quebec, canada, using apatite (u-th)/he thermochronology |
publisher |
University of Kansas |
publishDate |
2020 |
url |
http://hdl.handle.net/1808/30608 |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) ENVELOPE(-63.665,-63.665,59.000,59.000) ENVELOPE(-73.999,-73.999,60.000,60.000) |
geographic |
Canada Tilting Torngat Mountains Ungava Peninsula |
geographic_facet |
Canada Tilting Torngat Mountains Ungava Peninsula |
genre |
Labrador Sea Ungava peninsula |
genre_facet |
Labrador Sea Ungava peninsula |
op_relation |
http://hdl.handle.net/1808/30608 |
op_rights |
This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. openAccess |
_version_ |
1766061123515187200 |