THE FRANKLIN MINING DISTRICT

General features

Geology

History

 

Mines and mineral localities

 

The ore deposits

Average composition of the ore

utilization of the ore

 

Paragenesis of the minerals

 

Minerals of the pegmatite bodies

 

Minerals of the magnetite bodies

 

Minerals of the Franklin limestone

 

Minerals of the Kittatinny limestone

 

Minerals in the Zinc Ores

 

Genetic classification

 

Primary minerals

 

Minerals in the pegmatite contact zones

 

General features

 

Skarn and recrystallization products

 

Pneumatolytic products

 

Minerals of the hydrothermal veins

 

Minerals resulting from surface oxidation and other alteration

 

Origin of the zinc ore deposits

 

Igneous-injection hypothesis

 

Sedimentary- deposition hypothesis

 

Contact- metamorphism hypothesis

 

Hypothesis of replacement from magmatic solutions

 

Metasomatic- emplacement

 

 

Contact-metamorphism hypothesis

The hypothesis of the development of the ores through contact metamorphism due to the intrusion of the pegmatites was first proposed by Nason (143) in 1890 and was advocated in 1893 by Kemp (152), who misinterpreted the relations of the pegmatite dikes, then poorly exposed, to the ore bodies. It was rejected by Ries and Bowen (223) on evidence similar to that given above, proving that the pegmatites that are in contact with the zinc ore bodies are intrusive into them.

 

	Website © by Herb Yeates 1997-2006.
	This page created: August 12, 2006 6:43 PM