Mantle Melting, Melt Transport, and Delivery Beneath a Slow-Spreading Ridge: The Paleo-MAR from 23 15'N to 23 45'N

Dick, H. J.; Lissenberg, C. Johan; Warren, J. M.

doi:10.1093/petrology/egp088

Cited by 136 publications

(90 citation statements)

References 100 publications

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“…Nickel contents of olivines of site A and B generally range from 0.38 to 0.46 wt.% NiO, and extend to lower values (reaching 0.26 wt.%) in compositelherzolites of site A, with a maximum NiO content (0.54 wt.%) in a lherzolite spatially associated with hornblendite at site B (04LH04). This range of Mg# and Ni contents is similar to those reported for in olivine-websterites and peridotites of abyssal peridotites, forearc peridotites, ophiolite sequences, and cratonic xenoliths (e.g., Kelemen et al, 1998;O'Hara and Ishii, 1998;Suhr et al, 2003;Dick et al, 2010;Warren and Shimizu, 2010).…”

Section: Olivine and Spinel Compositionssupporting

confidence: 85%

Mineralogical and geochemical constraints on the shallow origin, ancient veining, and multi-stage modification of the Lherz peridotite

Riches

Rogers

2011

Geochimica et Cosmochimica Acta

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Section: Olivine and Spinel Compositionssupporting

confidence: 85%

Mineralogical and geochemical constraints on the shallow origin, ancient veining, and multi-stage modification of the Lherz peridotite

Riches

Rogers

2011

Geochimica et Cosmochimica Acta

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“…3), and we use it to calculate precision in our corrected measurements of Fe 3+ /ΣFe ratios of unknown spinel samples. Deviations of each session average (Supplementary 1 Table S2) from their respective multisession means (Table 4) (2016): (Prinz et al 1976;Hamlyn and Bonatti 1980;Dick and Bullen 1984;Michael and Bonatti 1985;Shibata and Thompson 1986;Dick 1989;Bryndzia and Wood 1990;Johnson et al 1990;Juteau et al 1990;Komor et al 1990;Bonatti et al 1992Bonatti et al , 1993Cannat et al 1992;Johnson and Dick 1992;Snow 1993;Constantin et al 1995;Arai and Matsukage 1996;Dick and Natland 1996;Ghose et al 1996;Jaroslow et al 1996;Niida 1997;Ross and Elthon 1997;Stephens 1997;Hellebrand et al 2002aHellebrand et al , 2002bBrunelli et al 2003;Hellebrand and Snow 2003;Seyler et al 2003Seyler et al , 2007Coogan et al 2004;Workman and Hart 2005;Morishita et al 2007;Cipriani et al 2009;Warren et al 2009;Brunelli and Seyler 2010;Dick et al 2010;Warren and Shimizu 2010;…”

Section: /σFementioning

confidence: 99%

Revisiting the electron microprobe method of spinel-olivine-orthopyroxene oxybarometry applied to spinel peridotitesk

Davis

Cottrell

Birner

et al. 2017

American Mineralogist

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Natural peridotite samples containing olivine, orthopyroxene, and spinel can be used to assess the oxygen fugacity ( f O 2 ) of the upper mantle. The calculation requires accurate and precise quantification of spinel Fe 3+ /SFe ratios. Wood and Virgo (1989) /ΣFe ratios depends on the total concentration of Fe, and varies from ±0.012 to ±0.032 (1σ) in the samples analyzed; precision of uncorrected analyses is poorer by approximately a factor of two. We also present an examination of the uncertainties in the calculation contributed by the other variables used to derive f O2 . Because there is a logarithmic relationship between the activity of magnetite and logf O2 , the uncertainty in f O2 relative to the QFM buffer contributed by the electron microprobe analysis of spinel is asymmetrical and larger at low ferric Fe concentrations (+0.3/-0.4 log units, 1σ, at Fe 3+ /ΣFe = 0.10) than at higher ferric Fe concentrations (±0.1 log units, 1σ, at Fe 3+ /ΣFe = 0.40). Electron microprobe analysis of olivine and orthopyroxene together contribute another ±0.1 to ±0.2 log units of uncertainty (1σ). Uncertainty in the temperature and pressure of equilibration introduce additional errors on the order of tenths of log units to the calculation of relative f O2 . We also document and correct errors that appear in the literature when formulating f O2 that, combined, could yield errors in absolute f O2 of greater than 0.75 log units-even with perfectly accurate Fe 3+ /ΣFe ratios. Finally, we propose a strategy for calculating the activity of magnetite in spinel that preserves information gained during analysis about the ferric iron content of the spinel. This study demonstrates the superior accuracy and precision of corrected EPMA measurements of spinel Fe 3+ /ΣFe ratios compared to uncorrected measurements. It also provides an objective method for quantifying uncertainties in the calculation of f O2 from spinel peridotite mineral compositions.

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“…We also discuss several models for the origin of depleted peridotites in the studied area because peridotites with depleted signatures in melt components were recently reported from oceanic core complexes where fertile peridotites are expected to be recovered (Seyler et al 2007;Tamura et al 2008;Dick et al 2010) (Fig. 14.9).…”

Section: The Primary Features Of Peridotites: Implications For the Fomentioning

confidence: 97%

“…Romanche fracture zone (FZ) are from Bonatti et al (1993), FifteenTwenty FZ are from Godard et al (2008), and Kane megamullion (oceanic core complex) are from Dick et al (2010). The Garret and Hess Deep of East Pacific Rise (EPR) are from Constantin (1999) and Dick and Natland (Dick and Natland 1996), respectively.…”

mentioning

confidence: 99%

Petrology of Peridotites and Related Gabbroic Rocks Around the Kairei Hydrothermal Field in the Central Indian Ridge

Morishita

Nakamura

Shibuya

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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Peridotites and related gabbroic rocks are widely exposed in the Central Indian Ridge, where the H 2 -rich-fluid-bearing Kairei hydrothermal field exists. We report on petrological and mineralogical characteristics of peridotites and gabbroic rocks recovered from an oceanic core complex at a latitude of 25 South (25 S OCC) and the Yokoniwa Rise around the Kairei hydrothermal field. Gabbros recovered from the 25 S OCC show a wide range of variations in terms of mineral chemistry and mineral assemblages (olivine-gabbro, gabbronorite to highly evolved oxide gabbro) and are similar to those from the Atlantis Bank of the Southwest Indian Ridge, an ultraslow-spreading ocean ridge. Peridotites recovered from 25 S OCC and the Yokoniwa Rise are generally characterized by moderately to highly depleted melt components. The partial melting of these peridotites is followed by chemical modification through interaction with a wide range of melts from relatively less evolved to highly evolved characteristics. Moderately to highly depleted melt components in the studied peridotites can be explained as being either residue after a relatively high-melt productivity period in intermediate-spreading ridges or a geochemically distinctive domain which has suffered from partial melting in the past rather than partial melting beneath the present mid-ocean ridge systems.

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Mantle Melting, Melt Transport, and Delivery Beneath a Slow-Spreading Ridge: The Paleo-MAR from 23 15'N to 23 45'N

Cited by 136 publications

References 100 publications

Mineralogical and geochemical constraints on the shallow origin, ancient veining, and multi-stage modification of the Lherz peridotite

Mineralogical and geochemical constraints on the shallow origin, ancient veining, and multi-stage modification of the Lherz peridotite

Revisiting the electron microprobe method of spinel-olivine-orthopyroxene oxybarometry applied to spinel peridotitesk

Petrology of Peridotites and Related Gabbroic Rocks Around the Kairei Hydrothermal Field in the Central Indian Ridge

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