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universalmining contact muscovite duplex table

Jun 27, 2008018332A new step‐heated muscovite separate of a second sample of contact‐metamorphosed Manning Canyon Shale yielded an indistinguishable plateau age of 144.0 177 0.77 Ma Figure 11 and Data Set S5. Following Wells et al. 1990 , these ages are interpreted to date the intrusion, and because the intrusion is cleaved, provide a lower age limit for ...

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