The trace element geochemistry of Corsican ophiolites

Beccaluva, Luigi; Ohnenstetter, Daniel; Ohnenstetter, M.; Venturelli, G.

doi:10.1007/bf00375283

Cited by 63 publications

(36 citation statements)

References 48 publications

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“…4). These Ti/V ratios and trends are consistent with an origin as MORB, an interpretation supported by the primary investigators [8,48,49,54,55]. Pearce [8] has also noted the tendency toward alkalinity in these rocks which he attributes to their origin in small ocean basins along a rifted continental margin.…”

Section: Application Of Ti/v Plots To Ophiolite Voicanicssupporting

confidence: 74%

“…Alkaline basahs which are intercalated with sediments that overlie the Karme~y ophiolitc have ri/v > 50, consistent with their proposed origin as an oceanic island [51]. V analyses for Troodos are unpublished [50], but the means and ranges reported by Beccaluva et al [48] are shown here: TL-Troodos lower pillow lavas: TU-Troodos upper pillow lavas: large circles respective means. The Troodos upper pillow lavas and the lavas and tonalites of the Papuan uhramafic belt [52] and the high-Mg andesites of Cape Vogel [53J, all have Ti/V< 20, which implies their formation near a convergent plate boundary (e.g., within an island arc, or in a small back-arc basin).…”

Section: Application Of Ti/v Plots To Ophiolite Voicanicssupporting

confidence: 53%

“…The mean and ranges of Ti and V from the "Upper" and "Lower" volcanic sequences are shown in Fig. 4 [48,49]. The means for both lava groups plot on the chondritic trend of Ti//V ~ 10, however, the ranges for the lower volcanic sequence are too large to draw any definite conclusions.…”

Section: Application Of Ti/v Plots To Ophiolite Voicanicsmentioning

confidence: 98%

“…Unfortunately, vanadium is not commonly determined (or reported) for many of these (e.g., Samail, Bay of Islands). Published examples for which vanadium analyses are available include: Corsica [48]; the northern Apennines [49]; Troodos [50] (ranges and means only reported by [48]); the Karm~ Complex in Norway [51]; and Papua-New Guinea [52,53]. These data are presented in Fig.…”

Section: Application Of Ti/v Plots To Ophiolite Voicanicsmentioning

confidence: 99%

“…Ti-V plots of ophiolites. Ophiolite volcanic rocks from Corsica [48], the northern Apennines [49] and the Karme~y Complex in Norway [51] have Ti/V ratios between about 30 and 55, except for rare alkaline basalts in the western Mediterranean. The strong linear trends in these suites imply fractionation dominated by olivine + plagioclasc (see Fig.…”

Section: Application Of Ti/v Plots To Ophiolite Voicanicsmentioning

confidence: 99%

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Ti-V plots and the petrogenesis of modern and ophiolitic lavas

Shervais

1982

Earth and Planetary Science Letters

2,046

960

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Plots of Ti vs. V for many modern volcanic rock associations are diagnostic of tectonic setting and can be used to determine possible tectonic settings of ophiolites as well. The basis of this plot is the variation in the crystal/liquid partition coefficients for vanadium, which range with increasing oxygen fugacity from > 1 to << 1. Since the partition coefficients for Ti are almost always << 1, the depletion of V relative to Ti is a function of the fo2 of the magma and its source, the degree of partial melting, and subsequent fractional crystallization. Volcanic rocks from modern island arcs have Ti/V ratios of ~20, except for calc-alkaline volcanics which show the effects of magnetite fractionation. MORB and continental flood basalts have Ti/V ratios of about 20-50 and alkaline rocks have Ti/V generally >50. Back-arc basin basalts may have either arc-like or MORB-like Ti/V ratios, and sample suites from single back-arc basins may have Ti/V ratios ranging from 10 to 50. This range in Ti/V ratios in samples from a restricted geographical area may be diagnostic of the back-arc setting. The Ti/V plot is applied here to published data on ophiolites from a variety of postulated settings and in general supports the conclusions of previous investigators. Ophiolites from the western Mediterranean (Corsica, northern Apennines) and the "lower" Karmoy volcanics have Ti/V trends similar to MORB; the "upper" Karmo'y volcanics have alkaline Ti/V ratios. Lavas and tonalites in the Papuan ultramafic belt, the high-Mg andesites of Cape Vogel, and the upper pillow lavas at Troodos all have Ti/V ratios < 20, consistent with formation in an island arc setting. More specific evaluation of the tectonic setting of these and other ophiolites requires application of detailed geologic and petrologic data as well as geochemistry. The Ti/V discrimination diagram, however, is a potentially powerful adjunct to these techniques.

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Section: Application Of Ti/v Plots To Ophiolite Voicanicssupporting

confidence: 74%

Section: Application Of Ti/v Plots To Ophiolite Voicanicssupporting

confidence: 53%

Section: Application Of Ti/v Plots To Ophiolite Voicanicsmentioning

confidence: 98%