The Mid-Atlantic shore to the Appalachian highlands: field by Gary Mark Fleeger, Steven J. Whitmeyer
By Gary Mark Fleeger, Steven J. Whitmeyer
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Extra resources for The Mid-Atlantic shore to the Appalachian highlands: field trip guidebook for the 2010 joint meeting of the Northeastern and Southeastern GSA Sections (GSA Field Guide 16)
1997, A geologic history of the north-central Appalachians, Part 1. Orogenesis from the Mesoproterozoic to the Taconic orogeny: American Journal of Science, v. 297, p. 551–619. , 1998, A geologic history of the north-central Appalachians, Part 3. The Alleghany orogeny: American Journal of Science, v. 298, p. 131–179. , 2009, Geologic map of the Conowingo Dam, Delta, Holtwood, and Wakefield 7-½ minute Quadrangles, Lancaster and York Counties, Pennsylvania: Pennsylvania Geological Survey, unpublished map.
On the other hand, muscovite or K-feldspar (and not chlorite or garnet) would develop if sufficient K were present. In the absence of sufficient Na or K relative to aluminum, pyrophyllite will appear, which at higher metamorphic grade would become kyanite, andalusite, or sillimanite. The presence of paragonite here suggests that sea water was readily available during metamorphism. In contrast, the profusion of the anhydrous albite in the upper part of the underlying Octoraro Formation would suggest a more restricted access to seawater.
0 1. 6 0. 3 67 281 32 20 40 Smith (2003) Note: Some may justifiably wonder how geochemically similar are basalts from various extension events. This table provides some idea of the geochemical distinctiveness of “different” rift-related basalts in the Pennsylvania, Maryland, West Virginia, and Virginia area, approximately from youngest to oldest. Also, consider examining table 3 of Smith and Barnes (2004) for an idea of how related basalts in the Catoctin sensu lato group vary as rifting and extension evolved into drifting.