Hostname: page-component-848d4c4894-m9kch Total loading time: 0 Render date: 2024-05-05T00:22:27.458Z Has data issue: false hasContentIssue false
  • English
  • Français

Deerite from Papua New Guinea

Published online by Cambridge University Press:  05 July 2018

M. A. Worthing
M. A. Worthing*
Affiliation:
Department of Geology, U.P.N.G., Box 320 University P.O., Port Moresby, Papua New Guinea
Get access Rights & Permissions [Opens in a new window]

Abstract

Deerite in two meta-ironstones from Papua New Guinea coexists with quartz-albite-riebeckite-dannemorite-magnetite-spessartine-stilpnomelane-apatite-Ca/Mn carbonates and quartz-albite-crossite-ilmenite-spessartine-stilpnomelane-apatite respectively. Geochemical comparisons in the system FeO-MnO-MgO suggest that the P.N.G. deerites most closely resemble Franciscan types. However, the metamorphic assemblages more closely resemble Alpine types indicating metamorphism close to the lower P-T limit of deerite stability. Consistent differences in whole-rock and internal oxidation ratios between the two specimens suggest that fo2 may be important in determining deerite chemistry. A redox equation is suggested linking changes in deerite internal oxidation ratio with variable OH content.

Keywords

deeritePapua New Guineaoxygen fugacity
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 363 , December 1987 , pp. 689 - 693
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

Present address: Department of Earth Sciences, The University of Leeds, Leeds, LS2 9JT, U.K.

References

Agrell, S.O., Bown, M.G., and McKie, D. (1965) Am. Mineral. 50, 278.Google Scholar
Bocquet, J. (1971) Eclog. Geol. Helv. 64, 71.Google Scholar
Brown, E.H. (1974) Geol. Soc. Am. Bull. 85, 333.2.0.CO;2>CrossRefGoogle Scholar
Chopin, C. (1978) Bull. Mineral. 101, 514.Google Scholar
Davies, H. (1971) Austral. Bur. Mineral. Resour. Bull. 128Google Scholar
Davies, H. (1980) Am. J. Sci. 280, 171.Google Scholar
Langer, K., Lattard, D., and Schreyer, W. (1977) Contrib Mineral. Petrol. 60, 271.CrossRefGoogle Scholar
Lattard, D., and Schreyer, W. (1981) Bull. Mineral. 104 431.Google Scholar
Muir Wood, R. (1979) Mineral. Mag. 43, 251.CrossRefGoogle Scholar
Okay, A.I. (1979) J. Geol. 88, 225.CrossRefGoogle Scholar
Pieters, P.E. (1978) Austral. Bur. Mineral. Resour., P.N.G. Geol. Surv. S/55-6, 7, 11.Google Scholar
Reinecke, T. (1987) Mineral. Mag. 51, 247-51.CrossRefGoogle Scholar
Rumble, D. (1976) In Short Course Notes 3, Oxide Minerals (Rumble, D., ed.) Mineral. Soc. Am. Rl.CrossRefGoogle Scholar
Schliestedt, M. (1978) Contrib. Mineral. Petrol. 66, 105.CrossRefGoogle Scholar