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Geologic Unit: Metacom
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  • Usage in publication:
    • Metacom Granite Gneiss
  • Modifications:
    • Overview
  • Dominant lithology:
    • Granite
    • Gneiss
  • AAPG geologic province:
    • New England province
Publication:

Skehan, J.W., and Rast, Nicholas, 1990, Pre-Mesozoic evolution of Avalon terranes of southern New England, IN Socci, A.D., Skehan, J.W., and Smith, G.W., eds., Geology of the composite Avalon terrane of southern New England: Geological Society of America Special Paper, 245, p. 13-53.


Summary:

Metacom Granite Gneiss occurs in eastern RI, as part of the Esmond-Dedham terrane. This plutonic complex described as gray, pink, and pale green, medium-grained, locally porphyritic and porphyroblastic rock, with "rod-like lineation" of biotite clusters after amphibole. Consists mainly of microcline, albite, quartz, biotite, muscovite, and sphene. Lithologically and texturally heterogeneous. Extensively mylonitized and recrystallized. Age is not discussed, but is shown as Late Proterozoic, older than Bulgarmarsh Granite; younger than Price Neck Formation.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

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