Magmatic sulfides and oxides in volcanic rocks from the Pitcairn hotspot (South Pacific)

Magmatic sulfides and oxides in volcanic rocks from the Pitcairn hotspot (South Pacific) The Pitcairn hotspot, located about 60 km east of Pitcairn Island (South Pacific), consists of several active volcanoes < 500 m below sea level. The volcanic rocks from these seamounts are classified in four main rock-types: (1) picritic basalt containing Ti-bearing chromite (8–10 wt.% TiO2); (2) alkali basalt (Ti-bearing chromite with 4–6 wt.% TiO2); (3) trachyandesite containing titanomagnetite (18–22 wt.% TiO2); and sulfides, and (4) trachyte (titanomagnetite with 19–23 wt.% TiO2); The metallic oxides are zoned with decreasing Tîl02 contents from core to rim. Crystal fractionation (> 60%) is the main process responsible for differentiating these rock-types from an enriched source. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mineralogy and Petrology Springer Journals

Magmatic sulfides and oxides in volcanic rocks from the Pitcairn hotspot (South Pacific)

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Publisher
Springer Journals
Copyright
Copyright © 1998 by Springer-Verlag
Subject
Earth Sciences; Mineralogy; Inorganic Chemistry; Geochemistry
ISSN
0930-0708
eISSN
1438-1168
D.O.I.
10.1007/BF01226567
Publisher site
See Article on Publisher Site

Abstract

The Pitcairn hotspot, located about 60 km east of Pitcairn Island (South Pacific), consists of several active volcanoes < 500 m below sea level. The volcanic rocks from these seamounts are classified in four main rock-types: (1) picritic basalt containing Ti-bearing chromite (8–10 wt.% TiO2); (2) alkali basalt (Ti-bearing chromite with 4–6 wt.% TiO2); (3) trachyandesite containing titanomagnetite (18–22 wt.% TiO2); and sulfides, and (4) trachyte (titanomagnetite with 19–23 wt.% TiO2); The metallic oxides are zoned with decreasing Tîl02 contents from core to rim. Crystal fractionation (> 60%) is the main process responsible for differentiating these rock-types from an enriched source.

Journal

Mineralogy and PetrologySpringer Journals

Published: Jan 30, 2005

References

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