Mineralization of the NJ Traprocks
Paragenesis- (adopted from Mason, 1960)

The deposition of the minerals in the NJ traprocks consisted of at least 6 events

1.
soilidification of the basalt itself- some rock forming silicates appear

2.
deposition of anhydrite and glauberite- saline solutions invade the forming rock and large xls of these minerals grow. They will later dissolve to leave molds that will be filled by later minerals.

3. quartz deposition- hot solutions bearing silica permeate the lava and crusts of quartz form on surfaces and existing crystals. This varies from site to site with the best deposition occurring in the Paterson area and the least in the Millington Quarry




4.
prehnite deposition- more mineral rich water invades and deposits prehnite atop the quartz. Shortly after this occurred the original anhydrite and glauberite dissolved away leaving molds in many of the covering minerals




5.
zeolite deposition- once again mineral rich water permeates, this time laying down a variety of zeolites and their associates. Stilbite and heulandite seem to be most common in many sites, especially in the Orange Mtn. basalt





6.
deposition of calcite- calcite and various sulfides seem to be the last to be deposited.