Emplacement of the Franklin Large Igneous Province and Initiation of the Sturtian Snowball Earth
During the Cryogenian (720 to 635 Ma ago) Snowball Earth glaciations, ice extended to sea level near the equator. The cause of this catastrophic failure of Earth’s thermostat has been unclear, but previous geochronology has suggested a rough coincidence of glacial onset with one of the largest magma...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
ScholarWorks
2022
|
Subjects: | |
Online Access: | https://scholarworks.boisestate.edu/geo_facpubs/686 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1693/viewcontent/Schmitz__Mark__2022__Emplacement_of_the_Franklin_large___pub.pdf |
id |
ftboisestateu:oai:scholarworks.boisestate.edu:geo_facpubs-1693 |
---|---|
record_format |
openpolar |
spelling |
ftboisestateu:oai:scholarworks.boisestate.edu:geo_facpubs-1693 2023-10-29T02:29:52+01:00 Emplacement of the Franklin Large Igneous Province and Initiation of the Sturtian Snowball Earth Schmitz, Mark D. 2022-11-25T08:00:00Z application/pdf https://scholarworks.boisestate.edu/geo_facpubs/686 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1693/viewcontent/Schmitz__Mark__2022__Emplacement_of_the_Franklin_large___pub.pdf unknown ScholarWorks https://scholarworks.boisestate.edu/geo_facpubs/686 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1693/viewcontent/Schmitz__Mark__2022__Emplacement_of_the_Franklin_large___pub.pdf http://creativecommons.org/licenses/by/4.0/ Geosciences Faculty Publications and Presentations Earth Sciences Geophysics and Seismology text 2022 ftboisestateu 2023-09-29T15:23:56Z During the Cryogenian (720 to 635 Ma ago) Snowball Earth glaciations, ice extended to sea level near the equator. The cause of this catastrophic failure of Earth’s thermostat has been unclear, but previous geochronology has suggested a rough coincidence of glacial onset with one of the largest magmatic episodes in the geological record, the Franklin large igneous province. U-Pb geochronology on zircon and baddeleyite from sills associated with the paleo-equatorial Franklin large igneous province in Arctic Canada record rapid emplacement between 719.86 ± 0.21 and 718.61 ± 0.30 Ma ago, 0.9 to 1.6 Ma before the onset of widespread glaciation. Geologic observations and (U-Th)/He dates on Franklin sills are compatible with major post–Franklin exhumation, possibly due to development of mafic volcanic highlands on windward equatorial Laurentia and increased global weatherability. After a transient magmatic CO2 flux, long-term carbon sequestration associated with increased weatherability could have nudged Earth over the threshold for runaway ice-albedo feedback. Text albedo Arctic Boise State University: Scholar Works |
institution |
Open Polar |
collection |
Boise State University: Scholar Works |
op_collection_id |
ftboisestateu |
language |
unknown |
topic |
Earth Sciences Geophysics and Seismology |
spellingShingle |
Earth Sciences Geophysics and Seismology Schmitz, Mark D. Emplacement of the Franklin Large Igneous Province and Initiation of the Sturtian Snowball Earth |
topic_facet |
Earth Sciences Geophysics and Seismology |
description |
During the Cryogenian (720 to 635 Ma ago) Snowball Earth glaciations, ice extended to sea level near the equator. The cause of this catastrophic failure of Earth’s thermostat has been unclear, but previous geochronology has suggested a rough coincidence of glacial onset with one of the largest magmatic episodes in the geological record, the Franklin large igneous province. U-Pb geochronology on zircon and baddeleyite from sills associated with the paleo-equatorial Franklin large igneous province in Arctic Canada record rapid emplacement between 719.86 ± 0.21 and 718.61 ± 0.30 Ma ago, 0.9 to 1.6 Ma before the onset of widespread glaciation. Geologic observations and (U-Th)/He dates on Franklin sills are compatible with major post–Franklin exhumation, possibly due to development of mafic volcanic highlands on windward equatorial Laurentia and increased global weatherability. After a transient magmatic CO2 flux, long-term carbon sequestration associated with increased weatherability could have nudged Earth over the threshold for runaway ice-albedo feedback. |
format |
Text |
author |
Schmitz, Mark D. |
author_facet |
Schmitz, Mark D. |
author_sort |
Schmitz, Mark D. |
title |
Emplacement of the Franklin Large Igneous Province and Initiation of the Sturtian Snowball Earth |
title_short |
Emplacement of the Franklin Large Igneous Province and Initiation of the Sturtian Snowball Earth |
title_full |
Emplacement of the Franklin Large Igneous Province and Initiation of the Sturtian Snowball Earth |
title_fullStr |
Emplacement of the Franklin Large Igneous Province and Initiation of the Sturtian Snowball Earth |
title_full_unstemmed |
Emplacement of the Franklin Large Igneous Province and Initiation of the Sturtian Snowball Earth |
title_sort |
emplacement of the franklin large igneous province and initiation of the sturtian snowball earth |
publisher |
ScholarWorks |
publishDate |
2022 |
url |
https://scholarworks.boisestate.edu/geo_facpubs/686 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1693/viewcontent/Schmitz__Mark__2022__Emplacement_of_the_Franklin_large___pub.pdf |
genre |
albedo Arctic |
genre_facet |
albedo Arctic |
op_source |
Geosciences Faculty Publications and Presentations |
op_relation |
https://scholarworks.boisestate.edu/geo_facpubs/686 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1693/viewcontent/Schmitz__Mark__2022__Emplacement_of_the_Franklin_large___pub.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
_version_ |
1781069984838975488 |