Relationship between the Montgomery Lake and Hurwitz groups, and stratigraphic revision of the lower Hurwitz Group, District of Keewatin
Recent detailed mapping has resulted in a possible solution to a long-standing stratigraphic controversy as to whether the contact between the Montgomery Lake Group (age uncertain) and the Hurwitz Group (Paleoproterozoic) is an unconformity. In its type area, the Montgomery Lake Group consists of ma...
Published in: | Canadian Journal of Earth Sciences |
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crcansciencepubl:10.1139/e96-094 2023-12-17T10:32:47+01:00 Relationship between the Montgomery Lake and Hurwitz groups, and stratigraphic revision of the lower Hurwitz Group, District of Keewatin Aspler, Lawrence B. Chiarenzelli, Jeffrey R. 1996 http://dx.doi.org/10.1139/e96-094 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-094 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 33, issue 9, page 1243-1255 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1996 crcansciencepubl https://doi.org/10.1139/e96-094 2023-11-19T13:39:26Z Recent detailed mapping has resulted in a possible solution to a long-standing stratigraphic controversy as to whether the contact between the Montgomery Lake Group (age uncertain) and the Hurwitz Group (Paleoproterozoic) is an unconformity. In its type area, the Montgomery Lake Group consists of mainly immature litharenite and lithic wacke, and is separated from underlying Archean greenstones and the overlying Hurwitz Group by angular unconformities. In the Padlei belt, a unit previously referred to as "Montgomery Lake sedimentary rocks," "Montgomery Lake Group," or "map unit X" consists of mainly submature to mature subarkose to quartz arenite, with interbeds of pyritic (auriferous) and nonpyritic (locally red) quartz pebble conglomerate. These rocks differ from the Montgomery Lake Group in its type area, but bear strong lithologic and stratigraphic resemblence to rocks in the lower Hurwitz Group. Furthermore, interfingering between map unit X and Hurwitz Group lithotypes suggests that map unit X is an integral part of the Herwitz Group and that its upper contact is transitional. We formally propose that map unit X be called the "Noomut Formation," a new unit at the base of the Hurwitz Group. In the absence of an unconformity in its lower part, the lower Hurwitz Group provides a continous record of the time during which free oxygen was sustained in Earth's atmosphere, and of paleoclimatic changes that may be related to the breakup of an earliest Paleoproterozoic supercontinent. Article in Journal/Newspaper Keewatin Canadian Science Publishing (via Crossref) Padlei ENVELOPE(-96.667,-96.667,61.917,61.917) Canadian Journal of Earth Sciences 33 9 1243 1255 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Aspler, Lawrence B. Chiarenzelli, Jeffrey R. Relationship between the Montgomery Lake and Hurwitz groups, and stratigraphic revision of the lower Hurwitz Group, District of Keewatin |
topic_facet |
General Earth and Planetary Sciences |
description |
Recent detailed mapping has resulted in a possible solution to a long-standing stratigraphic controversy as to whether the contact between the Montgomery Lake Group (age uncertain) and the Hurwitz Group (Paleoproterozoic) is an unconformity. In its type area, the Montgomery Lake Group consists of mainly immature litharenite and lithic wacke, and is separated from underlying Archean greenstones and the overlying Hurwitz Group by angular unconformities. In the Padlei belt, a unit previously referred to as "Montgomery Lake sedimentary rocks," "Montgomery Lake Group," or "map unit X" consists of mainly submature to mature subarkose to quartz arenite, with interbeds of pyritic (auriferous) and nonpyritic (locally red) quartz pebble conglomerate. These rocks differ from the Montgomery Lake Group in its type area, but bear strong lithologic and stratigraphic resemblence to rocks in the lower Hurwitz Group. Furthermore, interfingering between map unit X and Hurwitz Group lithotypes suggests that map unit X is an integral part of the Herwitz Group and that its upper contact is transitional. We formally propose that map unit X be called the "Noomut Formation," a new unit at the base of the Hurwitz Group. In the absence of an unconformity in its lower part, the lower Hurwitz Group provides a continous record of the time during which free oxygen was sustained in Earth's atmosphere, and of paleoclimatic changes that may be related to the breakup of an earliest Paleoproterozoic supercontinent. |
format |
Article in Journal/Newspaper |
author |
Aspler, Lawrence B. Chiarenzelli, Jeffrey R. |
author_facet |
Aspler, Lawrence B. Chiarenzelli, Jeffrey R. |
author_sort |
Aspler, Lawrence B. |
title |
Relationship between the Montgomery Lake and Hurwitz groups, and stratigraphic revision of the lower Hurwitz Group, District of Keewatin |
title_short |
Relationship between the Montgomery Lake and Hurwitz groups, and stratigraphic revision of the lower Hurwitz Group, District of Keewatin |
title_full |
Relationship between the Montgomery Lake and Hurwitz groups, and stratigraphic revision of the lower Hurwitz Group, District of Keewatin |
title_fullStr |
Relationship between the Montgomery Lake and Hurwitz groups, and stratigraphic revision of the lower Hurwitz Group, District of Keewatin |
title_full_unstemmed |
Relationship between the Montgomery Lake and Hurwitz groups, and stratigraphic revision of the lower Hurwitz Group, District of Keewatin |
title_sort |
relationship between the montgomery lake and hurwitz groups, and stratigraphic revision of the lower hurwitz group, district of keewatin |
publisher |
Canadian Science Publishing |
publishDate |
1996 |
url |
http://dx.doi.org/10.1139/e96-094 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-094 |
long_lat |
ENVELOPE(-96.667,-96.667,61.917,61.917) |
geographic |
Padlei |
geographic_facet |
Padlei |
genre |
Keewatin |
genre_facet |
Keewatin |
op_source |
Canadian Journal of Earth Sciences volume 33, issue 9, page 1243-1255 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e96-094 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
33 |
container_issue |
9 |
container_start_page |
1243 |
op_container_end_page |
1255 |
_version_ |
1785586621443211264 |