Integrated Ocean Drilling Program

Expedition 304 Preliminary Report

Oceanic Core Complex Formation, Atlantis Massif

Oceanic core complex formation, Atlantis Massif, Mid-Atlantic Ridge: drilling into the footwall and hanging wall of a tectonic exposure of deep, young oceanic lithosphere to study deformation, alteration, and melt generation

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TABLE OF CONTENTS

• COVER PAGE
• PUBLISHER'S NOTES
• SHIPBOARD PARTICIPANTS
  • Expedition Scientific Party
  • Transocean Officials
  • Industry Participant
  • IODP Shipboard Personnel and Technical Representatives
• ABSTRACT
• BACKGROUND AND OBJECTIVES
  • Scientific Objectives
• FOOTWALL SITE
  • Hole U1309A
  • Hole U1309B
  • Hole U1309C
  • Hole U1309D
  • Hole U1309E
  • Hole U1309F
  • Hole U1309G
  • Hole U1309H
  • Intrusive Sequence
  • Hydrothermal Alteration, Metamorphism, and Metasomatism
  • Structural Relationships
• HANGING WALL SITES
  • Site U1310
  • Site U1311
• PRELIMINARY SCIENTIFIC ASSESSMENT
• Expedition 304 OPERATIONS SUMMARY
  • Port Call
  • Transit to Site U1309 (Proposed Site AMFW-01A)
  • Site U1309 (Proposed Site AMFW-01A)
  • Site U1310 (Proposed Site AMHW-01A)
  • Site U1311 (Alternate Site AMHW-02A)
  • Return to Site U1309 (Proposed Site AMFW-01A)
• REFERENCES
• TABLE
  • Table T1. Expedition 304 site summaries.
• FIGURES
  • Figure F1. Tectonic and morphologic setting of Atlantis Massif.
  • Figure F2. Seismic profiles.
  • Figure F3. Basemap of Atlantis Massif.
  • Figure F4. Core scan of recovered basalt, talc-tremolite schist, and fractured diabase.
  • Figure F5. Lithologic columns.
  • Figure F6. Lithologic summary for Holes U1309B and U1309D.
  • Figure F7. Igneous contact in Hole U1309B.
  • Figure F8. MST magnetic susceptibility.
  • Figure F9. Major elements versus MgO
  • Figure F10. ermination of a late magmatic leucocratic vein.
  • Figure F11. Major elements versus SiO₂
  • Figure F12. Close-up photographs.
  • Figure F13. Variation in alteration intensity with depth.
  • Figure F14. Troctolite layer showing well-developed corona mesh texture.
  • Figure F15. Contact between coarse-grained gabbro and harzburgite.
  • Figure F16. Summary of deformation structures.
  • Figure F17. Magmatic layering in gabbro.
  • Figure F18. Examples of deformation structure.
  • Figure F19. Summary of characteristic remanence inclination.
  • Figure F20. Setting of hanging wall sites.
  • Figure F21. Full thin section scan of basalt from Hole U1311A.

Date posted: 5 April 2005

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