Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Rhode Island
|Name||Esmond Igneous Suite - granite gneiss|
|Geologic age||Late Proterozoic|
|Original map label||Zegg|
|Comments||Part of Esmond-Dedham Subterrane (West Bay Area)|
|Primary rock type||granitic gneiss|
|Secondary rock type||augen gneiss|
|Other rock types|
Metamorphic > Gneissgranite gneiss - Pale-gray to pale-pink, fine- to medium-grained granite gneiss, rarely with porphyroclasts of microcline/orthoclase. Composition ranges from quartz monzonite to granite. Composed of sodic plagioclase, quartz, microcline, biotite, opaque minerals; minor muscovite common, garnet more rare; accessory apatite and zircon; sphene and hornblende present in some rocks; secondary chlorite. Typically massive, but with strong penetrative foliation and lineation defined by major minerals. Commonly associated with, and in part gradational into, augen gneiss.
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.
|Geographic coverage||Kent - Providence - Washington|
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