Final inversion of the Midcontinent Rift during the Rigolet Phase of the Grenvillian Orogeny
Despite being a prominent continental-scale feature, the late Mesoproterozoic North American Midcontinent Rift did not result in the break-up of Laurentia, and subsequently underwent structural inversion. The timing of inversion is critical for constraining far-field effects of orogenesis and proces...
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ftcdlib:oai:escholarship.org:ark:/13030/qt0rh2r477 2023-07-02T03:33:37+02:00 Final inversion of the Midcontinent Rift during the Rigolet Phase of the Grenvillian Orogeny Hodgin, Eben B Swanson-Hysell, Nicholas L DeGraff, James M Kylander-Clark, Andrew RC Schmitz, Mark D Turner, Andrew C Zhang, Yiming Stolper, Daniel A 547 - 551 2022-05-01 application/pdf https://escholarship.org/uc/item/0rh2r477 unknown eScholarship, University of California qt0rh2r477 https://escholarship.org/uc/item/0rh2r477 CC-BY Geology, vol 50, iss 5 Earth Sciences Geochemistry & Geophysics article 2022 ftcdlib 2023-06-12T18:01:16Z Despite being a prominent continental-scale feature, the late Mesoproterozoic North American Midcontinent Rift did not result in the break-up of Laurentia, and subsequently underwent structural inversion. The timing of inversion is critical for constraining far-field effects of orogenesis and processes associated with the rift’s failure. The Keweenaw fault in northern Michigan (USA) is a major thrust structure associated with rift inversion; it places ca. 1093 Ma rift volcanic rocks atop the post-rift Jacobsville Formation, which is folded in its footwall. Previous detrital zircon (DZ) U-Pb geochronology conducted by laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) assigned a ca. 950 Ma maximum age to the Jacobsville Formation and led researchers to interpret its deposition and deformation as postdating the ca. 1090–980 Ma Grenvillian Orogeny. In this study, we reproduced similar DZ dates using LA-ICP-MS and then dated 19 of the youngest DZ grains using high-precision chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS). The youngest DZ dated by CA-ID-TIMS at 992.51 ± 0.64 Ma (2σ) redefines the maximum depositional age of the Jacobsville Formation and overlaps with a U-Pb LA-ICP-MS date of 985.5 ± 35.8 Ma (2σ) for late-kinematic calcite veins within the brecciated Keweenaw fault zone. Collectively, these data are interpreted to constrain deposition of the Jacobsville Formation and final rift inversion to have occurred during the 1010–980 Ma Rigolet Phase of the Grenvillian Orogeny, following an earlier phase of Ottawan inversion. Far-field deformation propagated >500 km into the continental interior during the Ottawan and Rigolet phases of the Grenvillian Orogeny. Article in Journal/Newspaper Rigolet University of California: eScholarship Rigolet ENVELOPE(-58.430,-58.430,54.180,54.180) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Geochemistry & Geophysics |
spellingShingle |
Earth Sciences Geochemistry & Geophysics Hodgin, Eben B Swanson-Hysell, Nicholas L DeGraff, James M Kylander-Clark, Andrew RC Schmitz, Mark D Turner, Andrew C Zhang, Yiming Stolper, Daniel A Final inversion of the Midcontinent Rift during the Rigolet Phase of the Grenvillian Orogeny |
topic_facet |
Earth Sciences Geochemistry & Geophysics |
description |
Despite being a prominent continental-scale feature, the late Mesoproterozoic North American Midcontinent Rift did not result in the break-up of Laurentia, and subsequently underwent structural inversion. The timing of inversion is critical for constraining far-field effects of orogenesis and processes associated with the rift’s failure. The Keweenaw fault in northern Michigan (USA) is a major thrust structure associated with rift inversion; it places ca. 1093 Ma rift volcanic rocks atop the post-rift Jacobsville Formation, which is folded in its footwall. Previous detrital zircon (DZ) U-Pb geochronology conducted by laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) assigned a ca. 950 Ma maximum age to the Jacobsville Formation and led researchers to interpret its deposition and deformation as postdating the ca. 1090–980 Ma Grenvillian Orogeny. In this study, we reproduced similar DZ dates using LA-ICP-MS and then dated 19 of the youngest DZ grains using high-precision chemical abrasion–isotope dilution–thermal ionization mass spectrometry (CA-ID-TIMS). The youngest DZ dated by CA-ID-TIMS at 992.51 ± 0.64 Ma (2σ) redefines the maximum depositional age of the Jacobsville Formation and overlaps with a U-Pb LA-ICP-MS date of 985.5 ± 35.8 Ma (2σ) for late-kinematic calcite veins within the brecciated Keweenaw fault zone. Collectively, these data are interpreted to constrain deposition of the Jacobsville Formation and final rift inversion to have occurred during the 1010–980 Ma Rigolet Phase of the Grenvillian Orogeny, following an earlier phase of Ottawan inversion. Far-field deformation propagated >500 km into the continental interior during the Ottawan and Rigolet phases of the Grenvillian Orogeny. |
format |
Article in Journal/Newspaper |
author |
Hodgin, Eben B Swanson-Hysell, Nicholas L DeGraff, James M Kylander-Clark, Andrew RC Schmitz, Mark D Turner, Andrew C Zhang, Yiming Stolper, Daniel A |
author_facet |
Hodgin, Eben B Swanson-Hysell, Nicholas L DeGraff, James M Kylander-Clark, Andrew RC Schmitz, Mark D Turner, Andrew C Zhang, Yiming Stolper, Daniel A |
author_sort |
Hodgin, Eben B |
title |
Final inversion of the Midcontinent Rift during the Rigolet Phase of the Grenvillian Orogeny |
title_short |
Final inversion of the Midcontinent Rift during the Rigolet Phase of the Grenvillian Orogeny |
title_full |
Final inversion of the Midcontinent Rift during the Rigolet Phase of the Grenvillian Orogeny |
title_fullStr |
Final inversion of the Midcontinent Rift during the Rigolet Phase of the Grenvillian Orogeny |
title_full_unstemmed |
Final inversion of the Midcontinent Rift during the Rigolet Phase of the Grenvillian Orogeny |
title_sort |
final inversion of the midcontinent rift during the rigolet phase of the grenvillian orogeny |
publisher |
eScholarship, University of California |
publishDate |
2022 |
url |
https://escholarship.org/uc/item/0rh2r477 |
op_coverage |
547 - 551 |
long_lat |
ENVELOPE(-58.430,-58.430,54.180,54.180) |
geographic |
Rigolet |
geographic_facet |
Rigolet |
genre |
Rigolet |
genre_facet |
Rigolet |
op_source |
Geology, vol 50, iss 5 |
op_relation |
qt0rh2r477 https://escholarship.org/uc/item/0rh2r477 |
op_rights |
CC-BY |
_version_ |
1770273636272308224 |