Maximum depositional age of the Neoproterozoic Jacobsville Sandstone, Michigan: Implications for the evolution of the Midcontinent Rift

David H. Malone; Carol A. Stein; John P. Craddock; Jonas Kley; Seth Stein; John E. Malone

doi:10.1130/GES01302.1

Maximum depositional age of the Neoproterozoic Jacobsville Sandstone, Michigan: Implications for the evolution of the Midcontinent Rift

David H. Malone, Carol A. Stein^*, John P. Craddock, Jonas Kley, Seth Stein, John E. Malone

^*Corresponding author for this work

Earth, Environmental, and Planetary Sciences

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

A crucial constraint on the evolution of the ca. 1100 Ma Midcontinent Rift (MCR) in North America comes from the Jacobsville Sandstone, Bayfield Group, and other equivalent sedimentary rocks (JBE) that overlie the volcanics and sediments deposited in the MCR basin near Lake Superior. The MCR began extending ca. 1120 Ma and failed-ceased extending-at ca. 1096 Ma, although volcanism continued for ~10 m.y. The JBE's age is poorly constrained, with proposed ages ranging from ca. 1100 to ca. 542 Ma (i.e., youngest Precambrian). It has been proposed that the JBE were deposited shortly prior to or during the time when the MCR failed due to regional compression occurring ca. 1060 Ma as part of the Grenville orogeny (1300-980 Ma). However, the JBE are not conformable with the youngest rift-filling strata and differ compositionally from them. We present an analysis of 2050 new detrital-zircon ages showing that the JBE are younger than 959 ± 19 Ma. Thus, the JBE and the compression recorded in them that inverted the basin postdate the Grenville orogeny and are unrelated to the rift's failure. The JBE may be significantly, perhaps ~200-300 m.y., younger than the maximum age from zircons and may have been deposited shortly after a Snowball Earth event.

Original language	English (US)
Pages (from-to)	1271-1282
Number of pages	12
Journal	Geosphere
Volume	12
Issue number	4
DOIs	https://doi.org/10.1130/GES01302.1
State	Published - 2016

Funding

We thank Gwen Gates, Ellyn Rickels, and Kacey Garber for help with zircon sample preparation and U-Pb analysis at the University of Arizona. We thank W.R. Van Schmus, Stephan Marshak, and one anonymous reviewer for helpful comments. We also appreciate the efforts of the Arizona Laserchron Center staff, namely Mark Pecha and Nicky Giesler. We thank Stuart Gilder for helpful discussions and the Alexander von Humboldt Foundation for supporting the Steins' stay at the Georg-August-Universität Göttingen and Ludwig-Maximilians Universität München. This work was supported by National Science Foundation grants EAR-1148088 and EAR-0952345.

ASJC Scopus subject areas

Geology
Stratigraphy

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10.1130/GES01302.1

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@article{83107cd4814d440da2c428d4117dd5ee,

title = "Maximum depositional age of the Neoproterozoic Jacobsville Sandstone, Michigan: Implications for the evolution of the Midcontinent Rift",

abstract = "A crucial constraint on the evolution of the ca. 1100 Ma Midcontinent Rift (MCR) in North America comes from the Jacobsville Sandstone, Bayfield Group, and other equivalent sedimentary rocks (JBE) that overlie the volcanics and sediments deposited in the MCR basin near Lake Superior. The MCR began extending ca. 1120 Ma and failed-ceased extending-at ca. 1096 Ma, although volcanism continued for ~10 m.y. The JBE's age is poorly constrained, with proposed ages ranging from ca. 1100 to ca. 542 Ma (i.e., youngest Precambrian). It has been proposed that the JBE were deposited shortly prior to or during the time when the MCR failed due to regional compression occurring ca. 1060 Ma as part of the Grenville orogeny (1300-980 Ma). However, the JBE are not conformable with the youngest rift-filling strata and differ compositionally from them. We present an analysis of 2050 new detrital-zircon ages showing that the JBE are younger than 959 ± 19 Ma. Thus, the JBE and the compression recorded in them that inverted the basin postdate the Grenville orogeny and are unrelated to the rift's failure. The JBE may be significantly, perhaps ~200-300 m.y., younger than the maximum age from zircons and may have been deposited shortly after a Snowball Earth event.",

author = "Malone, {David H.} and Stein, {Carol A.} and Craddock, {John P.} and Jonas Kley and Seth Stein and Malone, {John E.}",

note = "Funding Information: We thank Gwen Gates, Ellyn Rickels, and Kacey Garber for help with zircon sample preparation and U-Pb analysis at the University of Arizona. We thank W.R. Van Schmus, Stephan Marshak, and one anonymous reviewer for helpful comments. We also appreciate the efforts of the Arizona Laserchron Center staff, namely Mark Pecha and Nicky Giesler. We thank Stuart Gilder for helpful discussions and the Alexander von Humboldt Foundation for supporting the Steins' stay at the Georg-August-Universit{\"a}t G{\"o}ttingen and Ludwig-Maximilians Universit{\"a}t M{\"u}nchen. This work was supported by National Science Foundation grants EAR-1148088 and EAR-0952345. Publisher Copyright: {\textcopyright} 2016 Geological Society of America.",

year = "2016",

doi = "10.1130/GES01302.1",

language = "English (US)",

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AU - Kley, Jonas

AU - Stein, Seth

AU - Malone, John E.

N1 - Funding Information: We thank Gwen Gates, Ellyn Rickels, and Kacey Garber for help with zircon sample preparation and U-Pb analysis at the University of Arizona. We thank W.R. Van Schmus, Stephan Marshak, and one anonymous reviewer for helpful comments. We also appreciate the efforts of the Arizona Laserchron Center staff, namely Mark Pecha and Nicky Giesler. We thank Stuart Gilder for helpful discussions and the Alexander von Humboldt Foundation for supporting the Steins' stay at the Georg-August-Universität Göttingen and Ludwig-Maximilians Universität München. This work was supported by National Science Foundation grants EAR-1148088 and EAR-0952345. Publisher Copyright: © 2016 Geological Society of America.

PY - 2016

Y1 - 2016

N2 - A crucial constraint on the evolution of the ca. 1100 Ma Midcontinent Rift (MCR) in North America comes from the Jacobsville Sandstone, Bayfield Group, and other equivalent sedimentary rocks (JBE) that overlie the volcanics and sediments deposited in the MCR basin near Lake Superior. The MCR began extending ca. 1120 Ma and failed-ceased extending-at ca. 1096 Ma, although volcanism continued for ~10 m.y. The JBE's age is poorly constrained, with proposed ages ranging from ca. 1100 to ca. 542 Ma (i.e., youngest Precambrian). It has been proposed that the JBE were deposited shortly prior to or during the time when the MCR failed due to regional compression occurring ca. 1060 Ma as part of the Grenville orogeny (1300-980 Ma). However, the JBE are not conformable with the youngest rift-filling strata and differ compositionally from them. We present an analysis of 2050 new detrital-zircon ages showing that the JBE are younger than 959 ± 19 Ma. Thus, the JBE and the compression recorded in them that inverted the basin postdate the Grenville orogeny and are unrelated to the rift's failure. The JBE may be significantly, perhaps ~200-300 m.y., younger than the maximum age from zircons and may have been deposited shortly after a Snowball Earth event.

AB - A crucial constraint on the evolution of the ca. 1100 Ma Midcontinent Rift (MCR) in North America comes from the Jacobsville Sandstone, Bayfield Group, and other equivalent sedimentary rocks (JBE) that overlie the volcanics and sediments deposited in the MCR basin near Lake Superior. The MCR began extending ca. 1120 Ma and failed-ceased extending-at ca. 1096 Ma, although volcanism continued for ~10 m.y. The JBE's age is poorly constrained, with proposed ages ranging from ca. 1100 to ca. 542 Ma (i.e., youngest Precambrian). It has been proposed that the JBE were deposited shortly prior to or during the time when the MCR failed due to regional compression occurring ca. 1060 Ma as part of the Grenville orogeny (1300-980 Ma). However, the JBE are not conformable with the youngest rift-filling strata and differ compositionally from them. We present an analysis of 2050 new detrital-zircon ages showing that the JBE are younger than 959 ± 19 Ma. Thus, the JBE and the compression recorded in them that inverted the basin postdate the Grenville orogeny and are unrelated to the rift's failure. The JBE may be significantly, perhaps ~200-300 m.y., younger than the maximum age from zircons and may have been deposited shortly after a Snowball Earth event.

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Maximum depositional age of the Neoproterozoic Jacobsville Sandstone, Michigan: Implications for the evolution of the Midcontinent Rift

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