Mineralogy of magmatic sulfides and transition metal oxides from lavas of the Pitcairn Hotspot and the Pacific Antarctic Ridge

Ackermand, D., Hekinian, R. and Stoffers, R. (2007) Mineralogy of magmatic sulfides and transition metal oxides from lavas of the Pitcairn Hotspot and the Pacific Antarctic Ridge Neues Jahrbuch Fur Mineralogie-Abhandlungen, 184 (1). pp. 77-94. DOI 10.1127/0077-7757/2007/0081.

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Abstract

Transition metals (Fe, Co, Ni, Cu, Zn, Ti, Cr, and Mn) forming sulfides and oxides are found in a large variety of lava flows erupted on the sea floor of the South Pacific at the Pitcairn Hotspot and the Pacific Antarctic Ridge. These volcanic rocks consist of an enriched alkaline series (basanite-alkali basalt-trachybasalt-trachyandesite) and a depleted tholeiitic series (MORB -basaltic andesite-andesite-dacite). The distribution of the sulfides and oxides found in globules and as disseminated (< 1-5%) crystals in the rocks is controlled by the degree of fractional crystallization. The formation of these constituents reflects the decrease of the bulk transition metal content in the rock. Sulfide globules of pentlandite, pyrrhotite and cubanite are prominent in the intermediate and evolved rocks. Ti-bearing chromite and titanomagnetite are mainly concentrated in the least evolved (picritic alkali basalt, basanite, alkali basalt) and in the silica-rich (trachyte, andesite, dacite) lavas, respectively. The paragenesis of sulfide globules and oxides also correlates with the magma evolution during crystal-liquid fractionation.

Document Type: Article
Keywords: submarine volcanism pentlandite pyrrhotite cubanite titanomagnetite Ti-bearing chromite mid-atlantic ridge south-pacific east pacific volcanic-rocks basalt rise solubility seamounts petrology elements
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
Refereed: Yes
DOI etc.: 10.1127/0077-7757/2007/0081
ISSN: 0077-7757
Date Deposited: 12 Jan 2012 05:59
Last Modified: 24 Oct 2016 06:54
URI: http://eprints.uni-kiel.de/id/eprint/15883

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