8. Mineral Chemistry, Whole-Rock Compositions, and Petrogenesis of Leg 176 Gabbros: Data and Discussion

ABSTRACT

INTRODUCTION

SAMPLES

DATA

DISCUSSION

Attainment of Phase Equilibrium

Physical Conditions of Crystallization

Liquid vs. Cumulate and Bulk Hole Composition

Parental and Primary Melts, Bulk Crust, and Thermal Boundary Layer atop the Mantle

Origin of Fe-Ti-Rich Melts

Origin of Felsic Veins/Veinlets

Origin of Microgabbros

Modal Control on Bulk Rock Compositions

Downhole Compositional Profile

SUMMARY

ACKNOWLEDGMENTS

REFERENCES

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