Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Rhode Island
|Name||Narragansett Pier Plutonic Suite - leucocratic granite|
|Original map label||Pnlg|
|Comments||Part of Avalon Terrane Narragansett Pier Plutonic Suite - intrudes both Hope Valley and Esmond-Dedham subterranes (e.g., stitching pluton). Contains abundant veins of pegmatite too small to be mapped individually. Secondary unit description per RI003. Per printed map: age of rock based on radiometric data from RI007.|
|Primary rock type||granite|
|Secondary rock type||pegmatite|
|Other rock types||aplite; metasedimentary rock|
Igneous > Plutonic > Granitic > Leucocratic-graniticWhite to gray leucocratic granite composed of microcline, oligoclase, and quartz. Up to 10% accessory muscovite and garnet, with lesser apatite, zircon, and monazite. Biotite and opaque minerals notably sparse or absent.
Metamorphic > MetasedimentaryThe granite contains widespread xenolithic inclusions and screens of metasedimentary rock, some of which are PAnbr; bedding and fabric in the screens generally is oriented parallel to that in the host metasedimentary country rock.
Igneous > Plutonic > Granitic > Leucocratic-granitic > Aplitelocally exhibits flow foliation caused by alternating layers of pegmatite, aplite, and medium-grained equigranular granite; pegmatitic and aplitic material of mineralogy similar to the host granite.
Igneous > Plutonic > Granitic > Leucocratic-granitic > Pegmatitelocally exhibits flow foliation caused by alternating layers of pegmatite, aplite, and medium-grained equigranular granite; pegmatitic and aplitic material of mineralogy similar to the host granite.
Hermes, O.D., Gromet, L.P., Murray, D.P., Hamidzada, N.A., 1994, Geologic Map of Rhode Island, file name = bedrock_shp.zip (870kb) obtained from Rhode Island Geographic Information System, http://www.edc.uri.edu/rigis-spf/Statewide/state.html#geology , shapefile or interchange file, scale 1/100,000.
Hermes, O.D. (comp.), Gromet, L.P. (comp.), Murray, D.P. (comp.), Hamidzada, N.A., Skehan, J.W., and Mosher, S., 1994, Bedrock geologic map of Rhode Island: Rhode Island Map Series No. 1, Kingston, Rhode Island, scale 1: 100,000.
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