Wollastonite at the Sterling Hill Fe–Zn–Mn ore body, Ogdensburg, New Jersey (original) (raw)

Summary

Wollastonite occurs abundantly at the Sterling Hill Fe–Zn–Mn ore deposit, Ogdensburg, New Jersey, one of the few occurrences of wollastonite in regionally metamorphosed rocks; it is absent from the surrounding Franklin marble. Wollastonite occurs in two distinct bands along the inner margins of the synclinal ore deposit. Minerals associated with wollastonite include calcite, grossular-andradite, diopsidic pyroxene, alkali feldspar, and rarely vesuvianite, quartz or bustamite. Assuming the generally accepted values of 750 °C at 5 kbar at Sterling Hill during metamorphism in the Grenville Orogeny, thermodynamic modeling of reactions involving garnet and wollastonite suggest XCO2 ∼0.35 in the wollastonite-bearing rocks. Infiltrating metamorphic fluid rich in H2O was necessary for the formation of wollastonite; at XCO2 of 0.35, the calculated minimum volumetric water:rock ratio is 0.51. The source of the water is believed to be the dehydration of water-rich phases in adjacent ores or mafic rocks. The chemical compositions, textures, stratigraphy, and calculated metamorphic conditions show that wollastonite formed from calcite and quartz at the peak of the Grenville Orogeny.

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Authors and Affiliations

1. University of Delaware, Newark, DE, USA, , , , , , US
   A. Dúzs-Moore, P. B. Leavens & N. M. Altounian
2. Newark, DE, USA, , , , , , US
   R. E. Jenkins II

Authors

1. A. Dúzs-Moore
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2. P. B. Leavens
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3. R. E. Jenkins II
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4. N. M. Altounian
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Present address: Maryland State Highway Administration

Received August 18, 2002; revised version accepted February 5, 2003

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Dúzs-Moore, A., Leavens, P., Jenkins II, R. et al. Wollastonite at the Sterling Hill Fe–Zn–Mn ore body, Ogdensburg, New Jersey.Mineralogy and Petrology 79, 225–241 (2003). https://doi.org/10.1007/s00710-003-0235-6

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• Received: 18 August 2002
• Revised: 01 January 2003
• Accepted: 05 February 2003
• Published: 01 January 2003
• Issue Date: December 2003
• DOI: https://doi.org/10.1007/s00710-003-0235-6

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