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A⁴⁰/K⁴⁰ Ages of Micas and Feldspars from the Glenarm Series near Baltimore, Maryland

Wasserburg, G. J. and Pettijohn, F. J. and Lipson, J. (1957) A⁴⁰/K⁴⁰ Ages of Micas and Feldspars from the Glenarm Series near Baltimore, Maryland. Science, 126 (3269). pp. 355-357. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:20200505-085157720

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Abstract

The inner zone of the central Appalachian Mountains is a belt of metamorphic and plutonic rocks which crop out in the Blue Ridge province and underlie most of the Piedmont province. In southeastern Pennsylvania and adjacent parts of Maryland, the oldest rock is the Baltimore gneiss, which forms domical uplifts surrounded and overlain by the Glenarm series. This series consists of a basal quartzite (Setters) overlain by a marble (Cockeysville) and a thick series of mica schists (Wissahickon and Peters Creek) of sedimentary origin but including in some places altered volcanics (1). The Glenarm group is locally cut by pegmatite, granite, and other plutonic rocks.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1126/science.126.3269.355DOIArticle
ORCID:
AuthorORCID
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1957 American Association for the Advancement of Science. Received 13 May 1957.
Issue or Number:3269
Record Number:CaltechAUTHORS:20200505-085157720
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200505-085157720
Official Citation:A40/K40 Ages of Micas and Feldspars from the Glenarm Series near Baltimore, Maryland. BY G. J. WASSERBURG, F. J. PETTIJOHN, J. LIPSON. SCIENCE 23 AUG 1957: 355-357; doi: 10.1126/science.126.3269.355
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102996
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 May 2020 16:03
Last Modified:05 May 2020 16:03

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