The New Jersey Highlands are underlain principally by Middle Proterozoic orthogneiss, paragneiss, and marble that were metamorphosed to upper amphibolite to hornblende-granulite facies and were intruded by granitoid rocks. The oldest rocks are dacitic, tonalitic, and trondhjemitic gneiss and granite of calc-alkaline affinity and metabasalt of the Losee Metamorphic Suite. They are associated spatially with quartz-rich and quartz-poor charnockitic rocks. Field relationships and geochemical data support a cogenetic interpretation for the dacitic, tonalitic, and trondhjemitic rocks and the charnockitic rocks. They are herein all included in the Losee Metamorphic Suite.
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U.S. DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY
This page is https://pubs.usgs.gov/pdf/prof/p1565c/
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Last revised 08.06.99