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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 54 (1970)

Issue: 2. (February)

First Page: 353

Last Page: 356

Title: Age Dating of Muscovites from Pennsylvanian Sandstones near Wamego, Kansas: GEOLOGICAL NOTES

Author(s): D. G. Brookins (2), J. D. Voss (2)


Channel and sheet sandstones are common in the uppermost Pennsylvanian and lowermost Permian shales of eastern Kansas. These sandstone bodies characterize the nonmarine phase of a typical Wabaunsee cyclothem and locally are presumed to be related either directly or indirectly to each other because of their textural, mineralogic, and other diagnostic features. Near Wamego, Kansas, a channel sandstone cuts sheet sandstone of the Willard Shale (Upper Pennsylvanian). K-Ar dates on muscovite separated from both sandstones are 377 ± 11 m.y. for the channel sandstone and 389 ± 8 m.y. for the sheet sandstone. Rb-Sr dates on muscovite are 368 ± 20 m.y. for the channel sandstone and 401 ± 20 m.y. for the sheet sandstone. These ages agree within the limits of err r and indicate a common provenance area for the two sandstones, which is consistent with their similarities in particle sizes, clay mineralogy, and heavy-mineral suites. However, the ages indicate either direct or indirect derivation from a Middle to Lower Devonian source, none of which is known to have supplied clastic material to eastern Kansas.

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