Chemical variance in deep ocean basalts.

Hart, Roger (1976) Chemical variance in deep ocean basalts. Open Access Initial Reports of The Deep Sea Drilling Project, 34 . pp. 301-335. DOI 10.2973/dsdp.proc.34.119.1976.

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Multiple regression analysis was used to determine the relative importance of crystal fractionation, partial melting, and seawater alteration on the concentrations of 28 elements in deep ocean basalt. The components Al2O3, P2O5, and H2O were used as independent variables to represent each of these processes, and the computerderived equations show a high level of significance for all 28 elements.

The Al2O3, total Fe, and TiO2 of oceanic basalt vary greatly in any given region of the oceanic crust due to small-scale crystal settling. The oceanic crust is enriched in large-ion-lithophile (LIL) elements with time by off-ridge volcanism. With the notable exception of Zr and Hf, seawater alteration probably affects the concentration of LIL elements, but much less than partial melting. Seawater alteration leaches significant amounts of Si and Ca from oceanic basalt while enriching it in K, Li, and B.

Document Type: Article
Keywords: Chemical varicance, Deep ocean basalts, Al2O3, P2O5, H2O, large-ion-lithophile, LIL, LIL elements
Refereed: No
Open Access Journal?: Yes
DOI etc.: 10.2973/dsdp.proc.34.119.1976
Projects: Enrichment, DSDP
Date Deposited: 23 Nov 2016 09:13
Last Modified: 23 Nov 2016 09:13

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