40Ar/39Ar Data for White Mica, Biotite, and K-Feldspar Samples from Low-Grade Metamorphic Rocks in the Westminster Terrane and Adjacent Rocks, Maryland

Kunk, Michael J.; McAleer, Ryan

Abstract:

This report contains reduced 40Ar/39Ar data of white mica and K-feldspar mineral separates and matrix of a whole rock phyllite, all from low-grade metamorphic rocks of the Westminster terrane and adjacent strata in central Maryland. This report presents these data in a preliminary form, but in more detail than can be accommodated in todays professional journals. Also included in this report is information on the location of the samples and a brief description of the samples. The data contained herein are not interpreted in a geological context, and care should be taken by readers unfamiliar with argon isotopic data in the use of these results; many of the individual apparent ages are not geologically meaningful. This report is primarily a detailed source document for subsequent publications that will integrate these data into a geological context.

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USGS Numbered Series

ProdID:

86215

Citation Author:

Kunk, Michael J.; McAleer, Ryan

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Geological Survey (U.S.)

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ENGLISH

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iii, 27 p.

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Geological Survey (U.S.)

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Open-File Report

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OFR

Citation Series Number:

2008-1281

Citation Search Results Text:

40Ar/39Ar Data for White Mica, Biotite, and K-Feldspar Samples from Low-Grade Metamorphic Rocks in the Westminster Terrane and Adjacent Rocks, Maryland; 2008; OFR; 2008-1281; Kunk, Michael J.; McAleer, Ryan