4. High-Temperature Fluid Migration within Oceanic Layer 3 Gabbros, Hole 735B, Southwest Indian Ridge: Implications for the Magmatic-Hydrothermal Transition at Slow-Spreading Mid-Ocean Ridges

ABSTRACT

INTRODUCTION

GEOLOGIC SETTING AND LITHOLOGIC FRAMEWORK OF HOLE 735B

PROBLEMS WITH MAGMATIC/METAMORPHIC TRANSITION BENEATH SPREADING RIDGES

ANALYTICAL METHODS

DESCRIPTION OF THE HIGH-TEMPERATURE MICROSCOPIC VEINS AND RELATED TEXTURES

CHEMICAL COMPOSITIONS OF CLINOPYROXENE, ORTHOPYROXENE, AND AMPHIBOLE FROM THE HIGH-TEMPERATURE MICROSCOPIC VEINS AND THE RELATED TEXTURES

TEMPERATURE CONDITIONS OF THE HIGH-TEMPERATURE MICROSCOPIC VEINS AND INTERGROWTHS

DISCUSSION

Relation between the High-Temperature Microscopic Veins and the Interfingering Texture of Clinopyroxene

Origin of the High-Temperature Microscopic Veins: Fluid Origin or Silicate Melt Origin?

Origin of the Fluid: Magmatic Origin or Seawater Origin?

CONCLUSIONS

ACKNOWLEDGMENTS

REFERENCES

APPENDIX

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