Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-23T13:14:08.488Z Has data issue: false hasContentIssue false
  • English
  • Français

Petrology of forearc peridotite from the Hahajima Seamount, the Izu-Bonin arc, with special reference to chemical characteristics of chromian spinel

Published online by Cambridge University Press:  05 July 2018

H. Okamura ,
S. Arai  and
Y.-U. Kim
H. Okamura*
Affiliation:
Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
S. Arai
Affiliation:
Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
Y.-U. Kim
Affiliation:
School of Marine Science and Technology, Tokai University, 3-20-1 Shimizuorido, Shizuoka 424-8610, Japan
*
*E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Forearc peridotite is generally characterized by low Mg# (= Mg/[Mg + Fe2+] atomic ratio) at a given Cr# (= Cr/[Cr + Al] atomic ratio) of chromian spinel compared to common abyssal peridotite. This may be due to (1) smaller modal abundance of spinel and/or (2) lower equilibrium temperature, for the forearc peridotite. Forearc peridotite has the same amount of spinel as abyssal peridotite, eliminating the first possibility. Spinel in harzburgite and dunite from the Hahajima Seamount at the Izu-Bonin forearc, has a large Cr#, >0.57, and the Mg# is slightly variable towards low values at a given Cr#. The Mg# of spinel cores decreases strongly with a decrease in size. This is due to cooling along with hydration, which gave rise to a compositional variation of Ca-amphibole, from edenitic hornblende (high-temperature) to tremolite (low-temperature) in the Hahajima peridotite. The average two- pyroxene temperature of the Hahajima peridotite, 921°C, is less than that of the abyssal peridotite (1138°C), which is not consistent with a size-dependent Mg# of spinel for the latter. Forearc peridotite has been cooled effectively by H2O released from the subducted slab, causing a small Mg# of their spinels.

Keywords

forearc peridotitechromian spinelMg#coolinggrain size
Type
Research Article
Information
Mineralogical Magazine , Volume 70 , Issue 1 , February 2006 , pp. 15 - 26
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Aikawa, N. and Tokonami, M. (1987) Crystal structure and cation distribution of “cleavable” olivines. Mineralogical Journal 13, 271–279.CrossRefGoogle Scholar
Arai, S. (1980) Dunite-harzburgite-chromitite complexes as refractory residue in the Sangun-Yamaguchi zone, western Japan. Journal of Petrology 21, 141–165.CrossRefGoogle Scholar
Arai, S. (1992) Chemistry of chromian spinel in volcanic rocks as a potential guide to magma chemistry. Mineralogical Magazine 56, 173–184.CrossRefGoogle Scholar
Arai, S. (1994) Characterization of spinel peridotites by olivine-spinel compositional relationships: review and interpretation. Chemical Geology 113, 191–204.CrossRefGoogle Scholar
Arai, S. and Matsukage, K. (1996) Petrology of the gabbro-troctolite-peridotite complex from Hess Deep, Equatorial Pacific: implications for mantle-melt interaction within the oceanic lithosphere. Proceedings of the Ocean Drilling Program, Scientific Results 147, 135–155. College Station, Texas, USA.Google Scholar
Ballhaus, C, Berry, R.F. and Green, D.H. (1991) High pressure experimental calibration of the olivine-orthopyroxene-spinel oxygen geobarometer: implications for the oxidation state of the upper mantle. Contributions to Mineralogy and Petrology 107, 27–40.CrossRefGoogle Scholar
Bloomer, S.H. (1983) Distribution and origin of igneous rocks from the landward slopes of the Mariana Trench; Implications for its structure and evolution. Journal of Geophysical Research 88, 7411–7428.CrossRefGoogle Scholar
Dick, H.J.B. (1989) Abyssal peridotites, very slow spreading ridge and ocean ridge magmatism. Pp. 71–105 in: Magmatism in the Ocean Basis (Saunders, A.D. and Norry, M.J., editors). Special Publication, 42, Geological Society of London.Google Scholar
Dick, H.J.B. and Bullen, T. (1984) Chromian spinel as a petrogenetic indicator in abyssal and alpine-type peridotites and spatially associated lavas. Contributions to Mineralogy and Petrology 86, 54–76.CrossRefGoogle Scholar
Dick, H.J.B. and Natland, J.H. (1996) Last-stage melt evolution and transport in the shallow mantle beneath the East Pacific Rise. Proceedings of the Ocean Drilling Program, Scientific Results 147, 103–134, College Station, Texas, USA.Google Scholar
Evans, B.W. (1977) Metamorphism of Alpine peridotite and serpentinite. Annual Review of Earth and Planetary Sciences 5, 397–447.CrossRefGoogle Scholar
Evans, B.W. and Frost, B.R. (1975) Chrome-spinel in progressive metamorphism: A preliminary analysis. Geochimica et Cosmochimica Acta 39, 959–972.CrossRefGoogle Scholar
Fisher, R.L. and Engel, C.G. (1969) Ultramafic and basaltic rocks dredged from the nearshore flank of the Tonga trench. Geological Society of America Bulletin 80, 1373–1378.CrossRefGoogle Scholar
Fryer, P. (1996) Evolution of the Mariana convergent plate margin system. Reviews of Geophysics 34, 89–125.CrossRefGoogle Scholar
Hellebrend, E., Show, J.E., Dick, H.J.B. and Hofrnann, A.W. (2001) Coupled major and trace elements as indicators of the extent of melting in the mid-ocean-ridge peridotites. Nature 410, 677–681.CrossRefGoogle Scholar
Irvine, T.N. (1965) Chromian spinel as a petrogenetic indicator: Part 1, Theory. Canadian Journal of Earth Sciences 2, 648–672.CrossRefGoogle Scholar
Irvine, T.N. (1967) Chromian spinel as a petrogenetic indicator: Part 2, Petrologic applications. Canadian Journal of Earth Sciences 4, 71–103.CrossRefGoogle Scholar
Ishii, T. (1985) Dredged samples from the Ogasawara fore-arc seamount or ‘Ogasawara Paleoland’ -'Fore-arc ophiolite'. Pp. 307–342 in: Formation of Active Ocean Margin (Nasu, N. et al editors). Terrapub, Tokyo, Japan.CrossRefGoogle Scholar
Ishii, T., Robinson, P.T., Maekawa, H. and Fiske, R. (1992) Petrological studies of peridotites from diapiric serpentinite seamounts in the Izu-Ogasawara-Mariana forearc, Leg 125. Proceedings of the Ocean Drilling Program, Scientific Results 125, 445–485, College Station, Texas, USA.Google Scholar
Ishii, T., Sato, H., Haraguchi, S., Fryer, P., Fujioka, K., Bloomer, S. and Yokose, H. (2000) Petrological characteristic of peridotites from serpentinite sea-mount in the Izu-Ogasawara-Mariana forearc. Journal of Geography (Tokyo) 109, 517–530.Google Scholar
Kushiro, I. (1969) The system forsterite-diopside-silica with and without water at high pressures. American Journal of Science 267-A, 269–294.Google Scholar
Leake, B.E. (1978) Nomenclature of amphiboles. The Canadian Mineralogist 16, 501–520.Google Scholar
Matsukage, K. and Arai, S. (1998) Jadeite, albite and nepheline as inclusions in spinel of chromitite from Hess Deep, equatorial Pacific: their genesis and implications for serpentinite diapir formation. Contributions to Mineralogy and Petrology 131, 111–122.CrossRefGoogle Scholar
Ohara, Y. and Ishii, T. (1998) Peridotites from the southern Mariana forearc: Heterogeneous fluid supply in mantle wedge. The Island Arc, 7, 541–558.CrossRefGoogle Scholar
Ozawa, K. (1983) Evaluation of olivine-spinel geother-mometry as an indicator of thermal history for peridotites. Contributions to Mineralogy and Petrology 82, 52–65.Google Scholar
Ozawa, K. (1985) Olivine-spinel geospeedometry: analysis of diffusion-controlled Mg-Fe2+ exchange. Geochimica et Cosmochimica Ada 48, 2597–2611.Google Scholar
Parkinson, I.J. and Pearce, J.A. (1998) Peridotites from the Izu-Bonin-Mariana forearc (ODP Leg 125): Evidence for mantle melting and melt-mantle interaction in a supra-subduction zone setting. Journal of Petrology 39, 1577–1618.CrossRefGoogle Scholar
Shipboard Scientific Party (2002) Site 1200. Proceedings of the Ocean Drilling Program, Initial Reports 195, 1 – 173 (available from Ocean Drilling Program, Texas A&M University, College Station TX 77845-9547, USA).Google Scholar
Wells, P.R.A. (1977) Pyroxene thermometry in simple and complex systems. Contributions to Mineralogy and Petrology 62, 129–139.CrossRefGoogle Scholar