Contributions to Mineralogy and Petrology

, Volume 155, Issue 4, pp 491–509 | Cite as

Petrology and geochemistry of peridotites from IODP Site U1309 at Atlantis Massif, MAR 30°N: micro- and macro-scale melt penetrations into peridotites

  • Akihiro Tamura
  • Shoji Arai
  • Satoko Ishimaru
  • Eric S. Andal
Original Paper

Abstract

Peridotite samples recovered from IODP Site U1309 at the Atlantis Massif in the Mid-Atlantic Ridge were examined to understand magmatic processes for the oceanic core complex formation. Original peridotite was fragmented, and the limited short peridotite intervals are now surrounded by a huge gabbro body probably formed by late-stage melt injections. Each peridotite interval has various petrographical and geochemical features. A spinel harzburgite in contact with gabbro shows evidence of limited melt penetrations causing gradual compositional change, in terms of trace-element compositions of pyroxenes, as well as modal change near the boundary. Geochemistry of clinopyroxenes with least melt effects indicates that the harzburgite is originally mantle residue formed by partial melting under polybaric conditions, and that such a depleted peridotite is one of the components of the oceanic core complex. Some of plagioclase-bearing peridotites, on the other hand, have more complicated origin. Although their original features were partly overprinted by the injected melt, the original peridotites, both residual and non-residual materials, were possibly derived from the upper mantle. This suggests that the melt injected around an upper mantle region or into mantle material fragments. The injected melt was possibly generated at the ridge-segment center and, then, moved and evolved toward the segment end beneath the oceanic core complex.

Keywords

Abyssal peridotite Geochemistry of pyroxenes Melt/peridotite reaction Oceanic core complex 

Notes

Acknowledgments

This research used data and samples provided by IODP. We are grateful to the scientists, technicians, officers, and crews aboard the JOIDES Resolution and in TAMU for their help. This manuscript was greatly improved by comments from two anonymous reviewers. K.T.M. Johnson is thanked for his suggestions. T. Morishita, Y. Ishida and K. Tazaki are thanked for assistance with the electron microprobe and LA-ICP-MS analyses. This work was supported by JAMSTEC, Kanazawa University 21st Century COE program (led by K. Hayakawa), Grants-in Aid for Scientific Research (No. 18740336) from Ministry of Education, Culture, Sports, Science and Technology, Japan.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Akihiro Tamura
    • 1
  • Shoji Arai
    • 1
  • Satoko Ishimaru
    • 1
  • Eric S. Andal
    • 1
  1. 1.Department of Earth SciencesKanazawa UniversityKanazawaJapan

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