Resolving Paragneiss Provenance at Grollier Lake in the Athabasca Granulite Terrane, Western Canadian Shield
U-Pb crystallization ages of metamorphic and detrital zircons from all three paragneiss samples fall into the range of ca. 1.85-2.59 Ga, excluding two much older grains. Evidence suggests that the paragneiss of Grollier Lake record deformation exclusively from the Taltson and Trans-Hudson orogenies....
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
ScholarWorks@UARK
2016
|
Subjects: | |
Online Access: | https://scholarworks.uark.edu/etd/1563 https://scholarworks.uark.edu/context/etd/article/3102/viewcontent/Ply_uark_0011O_12122.pdf |
id |
ftunivarkansas:oai:scholarworks.uark.edu:etd-3102 |
---|---|
record_format |
openpolar |
spelling |
ftunivarkansas:oai:scholarworks.uark.edu:etd-3102 2023-11-12T04:20:35+01:00 Resolving Paragneiss Provenance at Grollier Lake in the Athabasca Granulite Terrane, Western Canadian Shield Ply, Dustin 2016-05-01T07:00:00Z application/pdf https://scholarworks.uark.edu/etd/1563 https://scholarworks.uark.edu/context/etd/article/3102/viewcontent/Ply_uark_0011O_12122.pdf unknown ScholarWorks@UARK https://scholarworks.uark.edu/etd/1563 https://scholarworks.uark.edu/context/etd/article/3102/viewcontent/Ply_uark_0011O_12122.pdf Graduate Theses and Dissertations Earth sciences Canada Geochronology La-icpms Paragneiss Provenance Geochemistry Geology Tectonics and Structure text 2016 ftunivarkansas 2023-10-30T09:38:00Z U-Pb crystallization ages of metamorphic and detrital zircons from all three paragneiss samples fall into the range of ca. 1.85-2.59 Ga, excluding two much older grains. Evidence suggests that the paragneiss of Grollier Lake record deformation exclusively from the Taltson and Trans-Hudson orogenies. It is apparent from geochronological data that the Taltson orogeny played an exceedingly larger role in the deformation of these rocks than the Trans-Hudson. Deposition of the paragneiss protoliths most likely culminated between ca. 2037-1994 Ma with metamorphism ceasing by 1852.1 ± 11.1 Ma. The oldest overgrowth considered to be concordant is 1994 ± 12 Ma and interpreted to represent the first signature of burial facilitated by the Taltson orogeny. U-Pb crystallization ages ranging from ca. 1872-1900 Ma can be attributed to metamorphisms from both the late Taltson or early Trans-Hudson orogenies given that the transition between these events is hard to delineate. Zircons dated > ca. 2.04 Ga are detrital in origin with U-Pb crystallization ages for these grains possibly being discordant as supported by the concordia diagrams. However, these ages can still be explained by provenance from sources such as the ca. 2.17-2.13 Ga Rutledge River basin to the west of Grollier Lake, and the ca. 2.3 Ga Arrowsmith subduction-related plutons north of Lake Athabasca. Older zircons (2955.6 ± 10.7 Ma and 3078 ± 13.9 Ma) in the migmatitic paragneiss are inferred to be inherited from Neoarchean and early Paleoproterozoic crust below. It is possible that rocks of the lower structural levels will record deformation from the Arrowsmith orogeny. Text Lake Athabasca University of Arkansas: ScholarWorks@UARK Arrowsmith ENVELOPE(162.300,162.300,-76.767,-76.767) Canada Grollier Lake ENVELOPE(-105.467,-105.467,59.717,59.717) Hudson Rutledge River ENVELOPE(-112.019,-112.019,61.060,61.060) |
institution |
Open Polar |
collection |
University of Arkansas: ScholarWorks@UARK |
op_collection_id |
ftunivarkansas |
language |
unknown |
topic |
Earth sciences Canada Geochronology La-icpms Paragneiss Provenance Geochemistry Geology Tectonics and Structure |
spellingShingle |
Earth sciences Canada Geochronology La-icpms Paragneiss Provenance Geochemistry Geology Tectonics and Structure Ply, Dustin Resolving Paragneiss Provenance at Grollier Lake in the Athabasca Granulite Terrane, Western Canadian Shield |
topic_facet |
Earth sciences Canada Geochronology La-icpms Paragneiss Provenance Geochemistry Geology Tectonics and Structure |
description |
U-Pb crystallization ages of metamorphic and detrital zircons from all three paragneiss samples fall into the range of ca. 1.85-2.59 Ga, excluding two much older grains. Evidence suggests that the paragneiss of Grollier Lake record deformation exclusively from the Taltson and Trans-Hudson orogenies. It is apparent from geochronological data that the Taltson orogeny played an exceedingly larger role in the deformation of these rocks than the Trans-Hudson. Deposition of the paragneiss protoliths most likely culminated between ca. 2037-1994 Ma with metamorphism ceasing by 1852.1 ± 11.1 Ma. The oldest overgrowth considered to be concordant is 1994 ± 12 Ma and interpreted to represent the first signature of burial facilitated by the Taltson orogeny. U-Pb crystallization ages ranging from ca. 1872-1900 Ma can be attributed to metamorphisms from both the late Taltson or early Trans-Hudson orogenies given that the transition between these events is hard to delineate. Zircons dated > ca. 2.04 Ga are detrital in origin with U-Pb crystallization ages for these grains possibly being discordant as supported by the concordia diagrams. However, these ages can still be explained by provenance from sources such as the ca. 2.17-2.13 Ga Rutledge River basin to the west of Grollier Lake, and the ca. 2.3 Ga Arrowsmith subduction-related plutons north of Lake Athabasca. Older zircons (2955.6 ± 10.7 Ma and 3078 ± 13.9 Ma) in the migmatitic paragneiss are inferred to be inherited from Neoarchean and early Paleoproterozoic crust below. It is possible that rocks of the lower structural levels will record deformation from the Arrowsmith orogeny. |
format |
Text |
author |
Ply, Dustin |
author_facet |
Ply, Dustin |
author_sort |
Ply, Dustin |
title |
Resolving Paragneiss Provenance at Grollier Lake in the Athabasca Granulite Terrane, Western Canadian Shield |
title_short |
Resolving Paragneiss Provenance at Grollier Lake in the Athabasca Granulite Terrane, Western Canadian Shield |
title_full |
Resolving Paragneiss Provenance at Grollier Lake in the Athabasca Granulite Terrane, Western Canadian Shield |
title_fullStr |
Resolving Paragneiss Provenance at Grollier Lake in the Athabasca Granulite Terrane, Western Canadian Shield |
title_full_unstemmed |
Resolving Paragneiss Provenance at Grollier Lake in the Athabasca Granulite Terrane, Western Canadian Shield |
title_sort |
resolving paragneiss provenance at grollier lake in the athabasca granulite terrane, western canadian shield |
publisher |
ScholarWorks@UARK |
publishDate |
2016 |
url |
https://scholarworks.uark.edu/etd/1563 https://scholarworks.uark.edu/context/etd/article/3102/viewcontent/Ply_uark_0011O_12122.pdf |
long_lat |
ENVELOPE(162.300,162.300,-76.767,-76.767) ENVELOPE(-105.467,-105.467,59.717,59.717) ENVELOPE(-112.019,-112.019,61.060,61.060) |
geographic |
Arrowsmith Canada Grollier Lake Hudson Rutledge River |
geographic_facet |
Arrowsmith Canada Grollier Lake Hudson Rutledge River |
genre |
Lake Athabasca |
genre_facet |
Lake Athabasca |
op_source |
Graduate Theses and Dissertations |
op_relation |
https://scholarworks.uark.edu/etd/1563 https://scholarworks.uark.edu/context/etd/article/3102/viewcontent/Ply_uark_0011O_12122.pdf |
_version_ |
1782336456032780288 |