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Hornblende Granite

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Pinkish-gray- to medium-buff-weathering, pinkish-white or light-pinkish-gray, medium- to coarse-grained, gneissoid to indistinctly foliated granite and sparse granite gneiss composed principally of microcline microperthite, quartz, oligoclase, and hornblende. Some phases are quartz syenite or quartz monzonite. Includes small bodies of pegmatite and amphibolite not shown on map. U-Pb age approximately 1,090 Ma (Drake and others, 1991b).
State New Jersey
Name Hornblende Granite
Geologic age Middle Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > GranitePinkish-gray- to medium-buff-weathering, pinkish-white or light-pinkish-gray, medium- to coarse-grained, gneissoid to indistinctly foliated granite and sparse granite gneiss composed principally of microcline microperthite, quartz, oligoclase, and hornblende.
Minor
Metamorphic > GneissPinkish-gray- to medium-buff-weathering, pinkish-white or light-pinkish-gray, medium- to coarse-grained, gneissoid to indistinctly foliated granite and sparse granite gneiss composed principally of microcline microperthite, quartz, oligoclase, and hornblende.
Igneous > Plutonic > Syenitic > Quartz-monzonite
Igneous > Plutonic > Syenitic > Quartz-syenite
Incidental
Igneous > Plutonic > Granitic > Leucocratic-granitic > Pegmatite
Metamorphic > Amphibolite
Comments Byram Intrusive Suite (Middle Proterozoic) (Drake, 1984)
References

Dalton, R.F., Herman, G.C., Monteverde, D.H., Pristas, R.S., Sugarman, P.J., and Volkert, R.A., 1999, New Jersey Department of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1), scale 1:100,000.

Drake, Avery A. Jr.,Volkert, Richard, A., Monteverde, Donald H., Herman, Gregory C., Houghton,Hugh F., Parker, Ronald A., and Dalton, Richard F., 1996, Bedrock Geologic Map of Northern New Jersey: U.S. Geological Survey Miscellanenous Investigations Map I-2540-A, 4 cross sections, 2 sheets, size 56x40; 58x41, scale 1:100.000.

https://pubs.er.usgs.gov/publication/i2540A

Drake, A.A., Jr., 1984, The Reading Prong of New Jersey and eastern Pennsylvania; an appraisal of the rock relations and chemistry of a major Proterozoic terrane in the Appalachians, in Bartholomew, M.J., ed., The Grenville event in the Appalachians and related topics: Geological Society of America Special Paper 194, p. 75-109.

Drake, A.A., Jr., Aleinikoff, J.N., and Volkert, R.A., 1991b, The Byram Intrusive Suite of the Reading Prong; age and tectonic environment, in Drake, A.A., Jr., ed., Contributions to New Jersey geology: U.S. Geological Survey Bulletin 1952, p. D1-D14.

https://pubs.er.usgs.gov/publication/b1952
NGMDB product
Counties Bergen - Hunterdon - Morris - Passaic - Somerset - Sussex - Warren